Guidelines on the treatment with integrated traditional Chinese medicine and western medicine for severe coronavirus disease 2019



# Introduction
Since the outbreak of Coronavirus Disease 2019 in December 2019, the epidemic has spread rapidly across several countries and regions worldwide. On January 30, 2020, the World Health Organization (WHO) announced that the outbreak of COVID-19 was classified as a Public Health Emergency of International Concern (PHEIC). Facing the severe global epidemic situation, WHO issued interim guidelines for severe acute respiratory infections caused by suspected novel coronavirus infectionson January 12, 2020, and the National Health Commission of the People's Republic of China (NHCPRC) updated the eighth edition of the Diagnosis and treatment of Coronavirus Disease-19on . Currently, the international epidemic situation is still not very optimistic. According to data from the official WHO outbreak report, by June 13, 2021, the total number of confirmed cases of novel coronavirus pneumonia was 174, 919,389 in 215 regions, countries, territories, and areas, with 410,909 new confirmed cases and 3782,619 cumulative deaths.
Severe COVID-19 is characterized by numerous complications and complex conditions, and the mortality rate (12.4%) is about 5 times higher than the total mortality rate of COVID-19 (2.3%) [bib_ref] Characteristics of and important lessons from the coronavirus disease 2019 (COVID-19) outbreak..., Wu [/bib_ref]. Therefore, the treatment of severe patients is one of the top priorities in the treatment of COVID-19. Integrated traditional Chinese medicine (TCM) and western medicine played an important role in the prevention and treatment of COVID-19 during the epidemic. To scientifically summarize and evaluate the effect of integrated TCM and western medicine in the prevention and treatment of COVID-19, and to promote the successful experience to the international community, we developed this guideline based on a global perspective and systematic guideline methodology. We hope the guideline might potentially provide guidance to fully utilize the preventive and control role of TCM during the epidemic.

## Scope
This guideline is intended for patients with COVID-19 who are at risk of severe conversion, have been diagnosed with severe disease, or patients that are recovering from severe COVID-19, including those who are suffering post-acute sequelae of COVID-19 (PASC, or long COVID). The guideline covers the prevention, treatment, rehabilitation, and psychological support of severe COVID-19 with integrated western medicine and TCM. This guideline applies to all healthcare providers, public health workers, and researchers involved in the diagnosis, treatment, and care of patients with COVID-19 in health care facilities and health administrations in all countries and regions.

## Guideline development process
Guideline development was launched on May 4, 2020, and finalized on June 13, 2021. The guideline development followed the Institute of Medicine (IOM) definition of guidelines [bib_ref] Failure of clinical practice guidelines to meet institute of medicine standards: two..., Kung [/bib_ref] , the specification process recommended by the WHO handbook for guideline development, and the Basic methods and procedures for the development/revision of Clinical Practice Guidelines [bib_ref] Basic methods and procedures for the development/revision of Clinical Practice Guidelines, Jiang [/bib_ref]. The guideline used the grading of recommendation evaluation, development and evaluation (GRADE) [bib_ref] GRADE Guidelines: 16. GRADE evidence to decision frameworks for tests in clinical..., Schunemann [/bib_ref] [bib_ref] Rating the quality of evidence and the strength of recommendations using GRADE, Canfield [/bib_ref] method to rigorously determine the evidence quality and strength of recommendations. Guidelines were constructed based on the list of entries in the Appraisal of Guidelines for Research and Evaluation (AGREE II) [bib_ref] AGREE II: advancing guideline development, reporting, and evaluation in health care, Brouwers [/bib_ref] [bib_ref] Guidelines 2.0: systematic development of a comprehensive checklist for a successful guideline..., Schunemann [/bib_ref] tool. The complete guidelines were written according to the Reporting Items for Practice Guidelines in Healthcare (RIGHT) [bib_ref] A reporting tool for practice guidelines in health care: the RIGHT statement, Chen [/bib_ref]. The entire guideline development process is shown in [fig_ref] Figure 1: Guideline development process [/fig_ref].

## Guideline panel
The Guideline Panel includes the following five groups: The chief expert group (n = 2) includes one chief clinical expert and one chief methodologist. The chief clinical expert is the overall leader of the guideline, responsible for drafting the scope of the guideline, determining the composition of the guideline team, having decisionmaking authority at all stages of guideline development, finalizing the draft of the guideline, and being responsible for the clinical applicability of the guideline. The chief methodologist is responsible for the top-level design, guidance, training, and quality control of the guideline methodology and is responsible for the methodological quality.
The steering committee (n = 4) is responsible for managing guideline conflicts of interest, approving guideline protocols, supervising the guideline development process, validating completed guidelines, and providing advice and guidance necessary for the guideline development.
The guideline development group (GDG, n = 5) is responsible for coordinating the work of various working groups, drafting guideline protocols, conducting clinical question investigation, organizing consensus meetings/surveys on recommendations, documenting the entire guideline development process in detail, writing the guidelines draft, and submission of the guidelines.
The evidence evaluation group (EEG, n = 12) is responsible for literature search, screening, inclusion, and quality evaluation; evidence extraction, synthesis, and grading; and creating the evidence profile.
The consensus group (n = 27) is responsible for voting and consensus on clinical questions and recommendations.

## Registration
This guideline has been registered bilingually on the International Practice Guidelines Registry Platform (http://www.guidelines-registry. org/) on May 4, 2020, with a unique registration number: IPGRP-2020CN062.

## Collection and determination of clinical questions
EEG and GDG systematically reviewed and collected clinical questions from existing guidelines, systematic reviews, and clinical studies of COVID-19, severe acute respiratory syndrome (SARS), and Middle East respiratory syndrome (MERS). Together with the clinical questions derived from the steering committee discussions, a total of 264 candidate clinical questions were obtained. After de-duplication, screening, and merging, 24 main clinical questions were determined. These 24 clinical questions were prioritized through an online questionnaire and supplemented with clinical questions that clinicians considered critical. We received questionnaire responses from 21 clinicians (three in TCM, four in respiratory medicine, four in critical care medicine, one in emergency medicine, three in rheumatology, three in nephrology, one in surgery, one in dermatology, and one in orthopedics) with experience in the prevention and treatment of COVID-19 from 17 medical institutions in ten provinces, cities, and autonomous regions in China. The importance of clinical questions was ranked according to the mean importance score (1-7 points) of each question. Finally, eight clinical issues were selected according to the results of the survey and the results of the discussion of the steering committee.

## Evidence collection
Considering the suddenness of outbreaks, the evidence may not be sufficient. Systematic reviews, meta-analyses, randomized controlled trials (RCTs), and observational studies were included. Evidence-based guidelines and official treatment protocols issued by various national and regional health institutions were also included. Considering the characteristics of TCM, we also refer to the consensus opinions of TCM experts (famous and experienced TCM practitioners certified by the National Administration of TCM and have a wealth of experience in the treatment of SARS and influenza).
The EEG deconstructed the final eight included clinical questions according to the PICO (participants, intervention, comparison, outcome) principle and conducted systematic searches according to topic terms combined with free words. We searched MEDLINE (via PubMed), Embase, the Cochrane Library, the China National Knowledge Infrastructure (CNKI), Wanfang, and the China Biology Medicine disc (CBM) for systematic reviews and meta-analyses, network meta-analyses, and clinical studies, supplemented by searches of Google Scholar (https:// scholar.google.com/) while tracing reference lists of the included literature; and searched WHO (https://www.who.int/), NICE (http://www. nice.org.uk/), NHCPRC (http://www.nhc.gov.cn/) and the National Administration of TCM (http://www.satcm.gov.cn/) for guidelines, treatment protocol, and consensus of TCM expert. The search period was from the establishment of the database to May 1, 2021, and the language of publication was limited to English and Chinese. Studies, guidelines, and treatment protocols were screened, identified, and checked to meet the inclusion criteria of every specific clinical question by two members of the EEG independently. Disagreements, if any, were resolved by discussion or consultation with a third party.

## Evidence evaluation and grading
EEP applied the AMSTAR scale [bib_ref] AMSTAR is a reliable and valid measurement tool to assess the methodological..., Shea [/bib_ref] , the Cochrane Collaboration's tool for assessing risk of bias (ROB) scale [bib_ref] Risk of bias reporting in Cochrane systematic reviews, Hopp [/bib_ref] , the Newcastle-Ottawa Scale (NOS) [bib_ref] Appraising the quality of medical education research methods: the Medical Education Research..., Cook [/bib_ref] , the National Institutes of Health (NIH) Research Quality Assessment Tool, the Canadian Institute of Health Economics (IHE) Quality Assessment of Case Series Studies, the Agency for Health Care Research and Quality (AHRQ) Cross-sectional Study Quality Evaluation Tool, and AGREE II [bib_ref] AGREE II: advancing guideline development, reporting, and evaluation in health care, Brouwers [/bib_ref] to evaluate the quality of systematic reviews and meta-analyses (network meta-analysis), RCTs, cohort and case-control studies, before-after studies, case series, cross-sectional studies, and guidelines and consensus, respectively. The GRADE [bib_ref] GRADE guidelines: 1. Introduction-GRADE evidence profiles and summary of findings tables, Guyatt [/bib_ref] [bib_ref] Application of GRADE in systematic reviews:necessity, frequently-asked questions and concerns, Chin, Chen [/bib_ref] system was used to evaluate the evidence quality and recommendations [fig_ref] Table 1: Evidence quality grades and strength of recommendations [/fig_ref]. Two researchers independently extracted data and assessed the quality of studies.

## Formulation of recommendations
The GDG initially developed appropriate recommendations for clinical practice based on the evidence included, with considering the preferences and values of patients, the costs of intervention, and the balance between pros and cons. Subsequently, the consensus group voted on every recommendation in Delphi surveys [bib_ref] Consensus methods for medical and health services research, Jones [/bib_ref] (selected one of "Not sure", "Disagree", or "Agree", reaching a consensus required 80% votes of "agree"). Additionally, the consensus group can propose modification suggestions to those recommendations that have reached a consensus. Two rounds of Delphi surveys were conducted on 8 February 2021 and 19 March 2021, with 22 recommendations reaching consensus and 99 modification suggestions collected. The GDG then completed the guidelines following the RIGHT report specifications.

## Dissemination and promotion of guidelines
After publication, the guideline will be disseminated and promoted in the following ways: (1) health authorities; (2) publications and official networks; (3) academic conferences and forums in related fields; (4) social media platforms; (5) interpretation of the guideline by invited experts published on common medical websites.

## Definition of terms
The definition of severe COVID-19 varies slightly around the world, but is primarily based on the presence of signs of pneumonia and severe dyspnea/hypoxemia. The definition of severe COVID-19 in this guideline follows both the WHO definition [fig_ref] Table 2: WHO severe COVID-19 definition [/fig_ref] and the definition of the Diagnosis and treatment of coronavirus disease-19 (8th trial edition)issued by the NHCPRC [fig_ref] Table 3: Definition of severe COVID-19 in the Diagnosis and treatment of COVID-19 [/fig_ref].
The term "usual care (UC)" (or usual treatment, standard care/ treatment, etc.) mentioned in different literature varies slightly depending on the center, region, and time, but mostly includes bed rest, supportive treatment, close monitoring of vital signs and indicators, symptomatic treatment, oxygen therapy, antibiotics (when there is evidence of a secondary bacterial infection) and sometimes empirical medications such as chloroquine phosphate or empirical antivirals (usually one or more of the following: IFN-, ribavirin, abidol, or lopinavir/ritonavir).

## Recommendations
Forty-seven articles were finally included in the study, including ten systematic reviews, 15 RCTs, nine cohort studies, two before-after studies, two cross-sectional studies, two case series, three guidelines, and four diagnosis and treatment protocols. A total of 22 recommendations were formed, and the essential points were summarized in [fig_ref] Table 4: Essential points of the recommendations [/fig_ref].
The following documents are included in the Supplementary Material: 1) Quality assessment of the included studies and guidelines; 2) the details and composition of TCM decoctions and Chinese patent medicines (CPM) mentioned in the recommendations and rationales; 3) the details, effect sizes, and safety data of the outcomes of the included clinical studies; 4) the GRADE evidence profile, which contains detailed information about the quality of evidence assessment and effect sizes of each clinical evidence. For COVID-19, supportive and symptomatic therapy is recommended (consensus recommendation). Triple therapy with interferon (IFN) -1b, lopinavir/ritonavir (Lpv/R), and ribavirin is suggested to reduce the severe conversion rate of COVID-19 (weak recommendation, low evidence quality); for elderly patients with mild COVID-19, early treatment with high-titer convalescent plasma can be considered (weak recommendation, high evidence quality).

## Rationale
Patients with COVID-19 should rest in bed and receive adequate supportive treatment, such as adequate nutrition and fluid support to ensure water-electrolyte balance and stability of the internal environment; symptomatic treatments such as antipyretic and analgesic treatment should also be given. One RCT [bib_ref] Triple combination of interferon beta-1b, lopinavir-ritonavir, and ribavirin in the treatment of..., Hung [/bib_ref] showed that, for mild and moderate COVID-19, the viral clearance time of nasopharyngeal swab was significantly reduced with the triple therapy of IFN-1b, Lpv/R, and ribavirin compared with Lpv/R alone (effect size and safety data of each study could be found in Supplementary Materials 3, while the effect size and GRADE assessment details of each evidence could be found in Supplementary Materials 4). Another RCTdemonstrated that early treatment with high-titer convalescent plasma significantly reduced the severe conversion rate in mild elderly patients with COVID-19 compared to placebo.
Some treatments may have more impairments than benefits in reducing the severe COVID-19 conversion rate. Lpv/R or ribavirin alone may not reduce the rate of severe conversion in patients with COVID-19 or improve important outcomes (moderate evidence quality); Lpv/R may increase the risk of diarrhea and nausea/vomiting(very low evidence quality). An evidence-based guidelineand four systematic reviews [bib_ref] Hydroxychloroquine use and progression or prognosis of COVID-19: a systematic review and..., Zang [/bib_ref] [bib_ref] Hydroxychloroquine for treatment of nonsevere COVID-19 patients: systematic review and meta-analysis of..., Elsawah [/bib_ref] [bib_ref] Virological and clinical cure in COVID-19 patients treated with hydroxychloroquine: a systematic..., Sarma [/bib_ref] [bib_ref] The outcome of hydroxychloroquine in patients treated for COVID-19: systematic review and..., Mega [/bib_ref] showed that hydroxychloroquine (HCQ) can postpone pulmonary radiological progression in patients with COVID-19 compared to UC, but there were no significant differences in viral clearance rate, clinical progression, and length of hospital stay, and it may also increase the risk of death and invasive mechanical ventilation (IMV). Furthermore, HCQ may increase the risk of adverse events such as diarrhea and nausea/vomiting (very low to low evidence quality). Two evidence-based guidelinesand one RCT [bib_ref] Early use of corticosteroid may prolong SARS-CoV-2 shedding in non-intensive care unit..., Tang [/bib_ref] indicated that corticosteroid treatment has no significant effect on the rate of clinical deterioration and may prolong the time to viral clearance and increase 28-day mortality rate in patients with mild or moderate COVID-19 (low to moderate evidence quality). Antibiotic therapy or prophylaxis (especially in combination with broad-spectrum antibacterial drugs) is

## Rationale
For COVID-19 treatment, the Diagnosis and treatment of COVID-19 (8th trial edition)recommended JHQG granules, LHQW capsules/granules, XBJ injection, QFPD decoction, HSBD decoction, and XFBD decoction based on phased syndrome differentiation, which is summarized as "three CPMs and three decoctions". JHQG granules and LHQW capsules (granules) are used mainly for fatigue with fever during the medical observation phase; XBJ injection is used mainly for the TCM syndrome of "overabundant beat in both Qifen and Yingfen" of severe COVID-19; QFPD decoction can be used for patients at any clinical stage; HSBD decoction is used mainly for the TCM syndrome of "epidemic toxin blocking lung" of severe COVID-19; XFBD decoction is mainly used for the TCM syndrome of "dampness toxin stagnant lung" of moderate COVID-19. Treatment of TCM decoctions or CPMs such as "three CPMs and three decoctions" based on syndrome differentiation in combination with UC (including EM such as Lpv/R, abidol, ribavirin, or interferon) can significantly reduce the severe COVID-19 conversion rate, improve symptoms, reduce complications, improve cardiopulmonary function, increase the cure rate, and reduce mortality compared with UC, with no statistical difference in the incidence of adverse events [bib_ref] Efficacy of Lianhua Qingwen Granules combined with Arbidol in the treatment of..., Yu [/bib_ref] [bib_ref] Retrospective analysis of 38 cases of COVID-19 treated by integrated traditional Chinese..., Lian [/bib_ref] [bib_ref] Analysis on clinical efficacy and liver injury of 100 cases of COVID-19..., Xia [/bib_ref] [bib_ref] Curative effects of integrated traditional Chinese and western medicine treatment regimens on..., Xie [/bib_ref] [bib_ref] Retrospective clinical analysis of traditional Chinese medicine Lianhua Qingwen in the treatment..., Yao [/bib_ref] [bib_ref] Chinese herbal medicine for coronavirus disease 2019: a systematic review and meta-analysis, Xiong [/bib_ref] [bib_ref] Chinese medical drugs for coronavirus disease 2019: a systematic review and metaanalysis, Pang [/bib_ref]. A cohort study [bib_ref] Hanshiyi Formula, a medicine for Sars-CoV2 infection in China, reduced the proportion..., Tian [/bib_ref] showed that the Hanshiyi formula can significantly reduce the severe conversion rate of patients with mild and moderate COVID-19 compared with UC (including antivirals such as oseltamivir or arbidol).

## Clinical question 2:
How to treat severe COVID-19 with integrated TCM and western medicine ?

## Recommendation 3
For severe COVID-19, close monitoring for signs of clinical deterioration, aggressive management of complications and secondary infections, and timely supportive treatment are recommended; respiratory support such as oxygen therapy, noninvasive ventilation (NIV), IMV, and airway management should be given immediately (consensus recommendation). For patients with COVID-19 who receive high flow nasal cannula (HFNC) or NIV, concurrent awake prone ventilation is recommended (weak recommendation, low evidence quality).

## Rationale
Close monitoring of clinical signs of deterioration such as rapid progressive respiratory failure and shock, active management of complications, treatment of underlying diseases, prevention of secondary infections, and timely support of organ function were considered the rules for treating severe COVID-19. Severe patients with PaO 2 /-FiO 2 less than 300 mmHg and those with emergency signs during resuscitation should immediately receive adjuvant oxygen therapy and airway management; after receiving a nasal catheter or mask oxygen inhalation, if respiratory distress or hypoxemia is not improved within 1~2 h, HFNC or NIV should be applied; if the condition is still not improved after 1~2 h, IMV should be performed in time; Extracorporeal membrane oxygenation (ECMO) could be administered if available. One evidence-based guidelineand one treatment protocolrecommended that patients with severe COVID-19 who require assisted oxygenation (including HFNC) or NIV should be placed in the awake prone position for > 12 h if there is no contraindication.

## Recommendation 4
Corticosteroids are recommended for the treatment of severe COVID-19 (strong recommendation, moderate evidence quality). For adult patients with high inflammatory markers, tocilizumab (TCZ) could be considered (strong recommendation, moderate evidence quality). For patients receiving oxygen therapy but not on IMV, 5 days of remdesivir treatment could be considered (weak recommendation, moderate evidence quality). For patients who fail to respond to initial therapy, appropriate treatment with intravenous immunoglobulin (IVIg) could be considered (strong recommendation, moderate evidence quality).

## Rationale
Two evidence-based guidelines, one systematic review [bib_ref] Efficacy and safety of systematic corticosteroids among severe COVID-19 patients: a systematic..., Ma [/bib_ref] , and one RCT [bib_ref] Intravenous methylprednisolone pulse as a treatment for hospitalised severe COVID-19 patients: results..., Edalatifard [/bib_ref] indicated that corticosteroid use in patients with severe or critical COVID-19 was associated with lower all-cause mortality and IMV requirements, higher disease improvement rates, and longer survival, with no increase in the incidence of serious adverse events except for a potential increase of hyperglycemia.
One evidence-based guideline, two systematic reviews [bib_ref] Optimal use of tocilizumab for severe and critical COVID-19: a systematic review..., Nugroho [/bib_ref] [bib_ref] The efficacy of IL-6 inhibitor Tocilizumab in reducing severe COVID-19 mortality: a..., Kaye [/bib_ref] , and one RCT [bib_ref] Effect of Tocilizumab vs usual care in adults hospitalized with COVID-19 and..., Hermine [/bib_ref] showed that TCZ reduced the risk of all-cause mortality and 14-day requirements of NIV and IMV in moderate to critical COVID-19 patients (including those with high interleukin-6 or C-reactive protein [CRP]; on oxygen support; have extensive bilateral lung disease; or need cortisol therapy) compared with UC, and subgroup analyses showed lower mortality at higher CRP levels ( 100 mg/L).
An RCT [bib_ref] The use of intravenous immunoglobulin gamma for the treatment of severe coronavirus..., Gharebaghi [/bib_ref] showed that IVIg therapy was associated with a significant reduction in mortality compared with placebo in patients with severe COVID-19 that fail to respond to initial therapy. A cohort study [bib_ref] High-dose intravenous immunoglobulin in severe coronavirus disease 2019: a multicenter retrospective study..., Cao [/bib_ref] indicated that high-dose IVIg (total dose of 2 g/kg body weight, over 2-5 days) significantly reduced mortality at 28 days in patients with severe COVID-19 compared to UC.
The overall benefit of some treatments for COVID-19 patients is not clear, but their use under specific conditions may be beneficial. One evidence-based guidelineindicated that remdesivir could not improve important outcomes in patients with COVID-19 (low certainty evidence). However, another evidence-based guidelinesuggested 5-days remdesivir treatment for COVID-19 patients (adults and young people aged 12 and over with a weight of 40 kg or more) who are in hospital and on supplemental oxygen but not on IMV, as there is evidence indicated that remdesivir can probably reduce the risk of death slightly (moderate certainty evidence).
Some treatments may have more impairments than benefits for the treatment of severe COVID-19. One evidence-based guidelineand one RCT [bib_ref] A trial of Lopinavir-Ritonavir in adults hospitalized with severe Covid-19, Cao [/bib_ref] indicated that Lpv/R treatment was not significantly different from UC in terms of mortality, IMV requirements, clinical improvement time, and length of hospital stay of the patients, and was more likely to result in gastrointestinal adverse events (low certainty evidence). One evidence-based guidelineand four systematic reviews [bib_ref] Hydroxychloroquine use and progression or prognosis of COVID-19: a systematic review and..., Zang [/bib_ref] [bib_ref] Hydroxychloroquine for treatment of nonsevere COVID-19 patients: systematic review and meta-analysis of..., Elsawah [/bib_ref] [bib_ref] Virological and clinical cure in COVID-19 patients treated with hydroxychloroquine: a systematic..., Sarma [/bib_ref] [bib_ref] The outcome of hydroxychloroquine in patients treated for COVID-19: systematic review and..., Mega [/bib_ref] showed no significant differences in viral clearance rate, clinical progression, or length of hospital stay in patients with treatment of HCQ compared with UC, and it may increase the risk of death, IMV, and adverse effects such as diarrhea and nausea/vomiting.

## Recommendation 5
Severe COVID-19 belongs to the "damp toxin epidemic" in TCM theory, and its main TCM pathogenesis is "epidemic toxin blocking lung" (consensus recommendation). TCM medications based on syndrome differentiation, such as "three CPMs and three decoctions" that has the effect of "releasing pulmonary Qi and detoxicating", are recommended to treat severe COVID-19 in combination with UC; TCM medications such as Ma Huang Liu Jun decoction that has the effect of "nourishing the spleen and dissipating dampness" is also recommended (strong recommendation, low to moderate evidence quality).

## Rationale
The Diagnosis and treatment of COVID-19 (8th trial edition)suggested that the main TCM pathogenesis of severe COVID-19 is "epidemic toxin blocking lung"; TCM decoctions including QFPD decoction, HSBD decoction, and Qingwen Baidu decoction, and CPMs such as XBJ injection, are suggested to treat severe COVID-19. Two systematic reviews [bib_ref] Chinese herbal medicine for coronavirus disease 2019: a systematic review and meta-analysis, Xiong [/bib_ref] [bib_ref] Chinese medical drugs for coronavirus disease 2019: a systematic review and metaanalysis, Pang [/bib_ref] and nine clinical studies [bib_ref] Retrospective analysis of 38 cases of COVID-19 treated by integrated traditional Chinese..., Lian [/bib_ref] [bib_ref] Integrated traditional Chinese and western medicine in the treatment of 40 cases..., Pan [/bib_ref] [bib_ref] Exploring an integrative therapy for treating COVID-19: a randomized controlled trial, Wang [/bib_ref] [bib_ref] Xuebijing injection in the treatment of COVID-19: a retrospective case-control study, Guo [/bib_ref] [bib_ref] Traditional Chinese Medicine decoctions significantly reduce the mortality in severe and critically..., Sun [/bib_ref] showed that CPMs (LHQW granules, JHQG granule, Tongjie Quwen granules, and XBJ injection) or TCM decoctions (Maxingshigan decoction, QFPD decoction, Qingfei Tongxie Fuzheng decoction, Maxing Xuanfei Jiedu decoction, and other decoctions based on syndrome differentiation) that have the efficacy of "detoxicating and releasing pulmonary Qi" could effectively ameliorate the symptoms of fever, cough, expectoration, shortness of breath, and fatigue; promote CT image improvement and viral clearance rate; shorten the length of hospital stay; and reduce the severe conversion rate and mortality, with no significant differences in safety compared to UC (including IFN-, Lpv/R, abidol, ribavirin, or chloroquine phosphate).
Severe COVID-19 belongs to the "damp toxin epidemic" in TCM theory [bib_ref] Discussion on traditional Chinese medicine prevention and treatment strategies of coronavirus disease..., Tong [/bib_ref] , therefore, "nourishing the spleen to dissipating dampness" was considered an important treatment method [bib_ref] Discussion on traditional Chinese medicine prevention and treatment strategies of coronavirus disease..., Tong [/bib_ref] [bib_ref] Differentiation reasoning for treatment of patients with difficulty in expectoration of sticky..., Liu [/bib_ref] [bib_ref] Discussion on the medical records of COVID-19 from the perspective of dampness-toxin..., Ding [/bib_ref]. A cohort study [bib_ref] Chinese herbal medicine reduces mortality in patients with severe and critical Coronavirus..., Chen [/bib_ref] demonstrated that UC (including IFN and ribavirin) combined with Mahuang Liujun decoction based on syndrome differentiation significantly reduced the mortality of patients with severe COVID-19 compared with UC alone. Another cohort study [bib_ref] Curative effects of integrated traditional Chinese and western medicine treatment regimens on..., Xie [/bib_ref] showed that the TCM decoctions based on syndrome differentiation, which has the effect of "detoxicating and releasing pulmonary qi, nourishing spleen, and dissipating dampness", could significantly improve the CT score of pneumonia, improve symptoms and inflammatory indicators, and reduce the incidence of adverse events in patients with severe COVID-19 compared with UC (including Lpv/R).

## Clinical question 3: how to treat elderly patients with severe covid-19 with integrated tcm and western medicine?

## Recommendation 6
For elderly patients with COVID-19, polypharmacy should be appropriately reduced; drug dose should be adjusted according to the condition, organ function, and drug interactions; and adverse events should be prevented. (consensus recommendation).

## Rationale
Older people are more likely to have deteriorated liver and kidney function, a low drug clearance rate, and a high risk of adverse events and liver/kidney damage. The Pharmacopoeia of the People's Republic of China (2015 edition)stipulates that elderly people (60-80 years old) should be given 3/4-4/5 of the dose as adults (18-60 years old), and the dose for elderly people over 80 years old should be reduced to 1/2 of that for adults. For elderly patients with COVID-19, medication prescriptions should be reviewed to reduce polypharmacy and prevent drug interactions and adverse events; community workers, doctors, nurses, pharmacists, physiotherapists, occupational therapists, mental health and psychosocial care providers, and other health care professionals should facilitate multidisciplinary collaboration in the decision-making process to solve multimorbidity and hypofunction problems in elderly patients.

## Recommendation 7
For elderly patients with severe COVID-19, potential complications such as secondary infection and disseminated intravascular coagulation should be closely monitored and actively prevented; treatments should focus on supportive, symptomatic treatment and TCM treatment with syndrome differentiation. (consensus recommendation).

## Rationale
Elderly COVID-19 patients are characterized by numerous underlying diseases, multiple complications, variable conditions, and limited nutritional intake [bib_ref] Analysis of clinical characteristics of elderly patients with novel coronavirus pneumonia, Zhang [/bib_ref] , suggesting that their management should be focused on supportive, symptomatic treatment, and TCM treatment based on syndrome differentiation. The neutrophil ratio in elderly patients with COVID-19 was significantly higher than that in non-elderly patients [bib_ref] Analysis of clinical characteristics of elderly patients with novel coronavirus pneumonia, Zhang [/bib_ref] , suggesting that elderly patients may be more susceptible to secondary infections. Therefore, respiratory pathogen monitoring should be actively performed, and targeted anti-infective treatment should be performed timely. D-dimer is significantly elevated in elderly patients [bib_ref] Analysis of clinical characteristics of elderly patients with novel coronavirus pneumonia, Zhang [/bib_ref] , suggesting a higher risk of disseminated intravascular coagulation; thus, close monitoring of coagulation indicators and timely implementation of interventions as well as symptomatic, supportive therapies and TCM treatment with syndrome differentiation are recommended. A cohort study on SARS [bib_ref] Clinical study on the treatment of elderly patients with SARS by integrated..., Huang [/bib_ref] showed that TCM decoction treatment with phased syndrome differentiation could significantly reduce the mortality of elderly patients and increase the improvement rate of clinical symptoms, which may provide a reference for the treatment of elderly COVID-19 patients.

## Recommendation 8
Elderly patients with COVID-19 showed more significant signs of the TCM pathogenesis of "deficiency" and "stasis" than non-elderly patients; therefore, the TCM therapeutic method of "strengthening healthy energy and removing blood stasis" is suggested (consensus recommendation).

## Rationale
Elderly patients with COVID-19 are characterized by reduced physiological and immune function. Their peripheral blood albumin and prealbumin are significantly lower than those of non-elderly patients, and the number of patients with inappetence is significantly larger than that of non-elderly patients, which might be related to the TCM pathogenesis of "deficiency". Compared to non-elderly patients, elderly patients with COVID-19 are more likely to have combined cardiovascular disease and significantly higher D-dimer, which might be due to the TCM pathogenesis of "stasis" [bib_ref] Analysis of clinical characteristics of elderly patients with novel coronavirus pneumonia, Zhang [/bib_ref]. Accordingly, the treatment should focus on "strengthening healthy energy and removing blood stasis" based on syndrome differentiation.

## Clinical question 4: how to mitigate the adverse effects of medications with integrated tcm and western medicine in the treatment of severe covid-19?

## Recommendation 9
Use the medications that carries the lowest risk of drug-drug interactions with other medications that the patient may be receiving; for medications with dose-dependent negative effects, minimum effective doses should be used for the shortest duration (consensus recommendation).

## Rationale
Careful consideration should be given to the numerous side effects of medications that may be used in the treatment of COVID-19, as well as drug-drug interactions between medications, both of which may affect COVID-19 symptomatology (including effects on respiratory, cardiac, immune, and mental or neurological function). Both pharmacokinetic and pharmacodynamic effects should be considered.

## Recommendation 10
Symptomatic treatment combined with TCM treatment based on syndrome differentiation is recommended for reducing potential adverse events in patients with severe COVID-19 (consensus recommendation). For liver damage, the combination of symptomatic treatment with TCM decoction based on the therapeutic strategy of "strengthening primordial energy, releasing pulmonary qi, nourishing spleen, and detoxification" is recommended (weak recommendation, low evidence quality).

## Rationale
A cohort study [bib_ref] Curative effects of integrated traditional Chinese and western medicine treatment regimens on..., Xie [/bib_ref] showed that TCM decoctions based on the therapeutic method of "strengthening primordial energy, releasing pulmonary qi, nourishing spleen, and detoxification" in combination with symptomatic treatment could significantly reduce the incidence of adverse events (especially elevated liver enzymes) of severe COVID-19.

## Recommendation 11
TCM treatment for severe COVID-19 based on syndrome differentiation could reduce adverse events by shortening the application time and total dose of other medications, such as antivirals or corticosteroids (strong recommendation, low evidence quality).

## Rationale
TCM medications based on syndrome differentiation could increase the treatment efficacy for severe COVID-19 with good safety , and therefore may reduce the adverse events by shortening the application time and total amount of other medications, such as antivirals or corticosteroids.

## Clinical question 5: how to treat the complications of severe covid-19 with integrated tcm and western medicine?

## Recommendation 12
For all potential complications of severe COVID-19, active monitoring and evaluation should be carried out according to the TCM theory of "treating the disease before it occurs (preventive treatment of disease)"; if complications have already occurred, it is recommended to immediately follow local treatment protocols for symptomatic treatment (consensus recommendation).

## Rationale
Two evidence-based guidelinesand one treatment protocolsuggested active monitoring of COVID-19 patients for signs or symptoms of thromboembolism, such as stroke, deep vein thrombosis, pulmonary embolism, or acute coronary syndrome; if clinically suspected, an appropriate diagnostic and management pathway needs to be initiated immediately. Adolescent and adult patients with COVID-19 should be evaluated for the risk of hemorrhage immediately after admission. For patients with suspected or confirmed myocardial injury, high-sensitivity troponin measurements and continuous ECG monitoring should be repeated daily, and blood pressure, heart rate, and fluid balance should be measured.

## Recommendation 13
For fatigue, chest distress, shortness of breath, loss of appetite, limb pain, and other complications in patients with severe COVID-19, it is recommended to use HXZQ capsule/dropping pill combined with LHQW capsule/granule based on syndrome differentiation (strong recommendation, moderate evidence quality). For digestive system complications, including anorexia, diarrhea, and constipation, TCM decoctions based on syndrome differentiation may be more effective than CPMs (strong recommendation, moderate evidence quality). For abdominal fullness, anorexia, and nausea, TCM herbs, such as Magnolia Bark (Houpu), Cablin patchouli herb (Huoxiang), and Atractylodes Rhizome (Cangzhu), that have the effect of "regulating stomach and dissipating dampness" or TCM herbs, such as roasted Endothelium Corneum Gigeriae Galli (Jineijin), fire-dried Fructus Crataegi (Shanzha), and Fructus Amomi (Sharen), that have the effect of "tonifying spleen and appetizing" could be considered based on syndrome differentiation (consensus recommendation). For constipation, dry stool, and abdominal distension, the Chengqi decoction series based on syndrome differentiation are suggested (consensus recommendation). For pulmonary function damage including pulmonary fibrosis, the TCM herbs, such as Circada Moulting (Chantui), Body of sick Silkworm (Jiangcan), and lumbricus (Dilong), that have the effects of "dispelling wind, dredging collaterals, and resolving hard lumps" could be considered; or Guizhi Fuling decoction (pill) could be considered for those who do not have high fever (consensus recommendation).

## Rationale
One RCTindicated that, HXZQ dripping pills combined with LHQW granules can effectively improve nausea, vomiting, limb pain, loss of appetite, limb pain, fatigue, chest tightness, shortness of breath, and other symptoms in patients with COVID-19, and meanwhile reduce the use of antibiotics. With the treatment of UC combining CPMs based on syndrome differentiation, some patients showed improvement in symptoms such as fever, cough, sore throat, and fatigue, while digestive symptoms such as poor appetite, diarrhea, or constipation did not improve significantly; after changing the CPMs to TCM decoctions with syndrome differentiation, the aforementioned symptoms improved [bib_ref] Analysis on clinical efficacy and liver injury of 100 cases of COVID-19..., Xia [/bib_ref]. TCM herbs, such as Magnolia Bark (Houpu), Cablin patchouli herb (Huoxiang), Atractylodes Rhizome (Cangzhu), with the effects of "regulating stomach and dissipating dampness" and TCM herbs, such as roasted Endothelium Corneum Gigeriae Galli (Jineijin), fire-dried Fructus Crataegi (Shanzha) and Fructus Amomi (Sharen), with the effects of "tonifying spleen and appetizing" based on syndrome differentiation can improve abdominal fullness, anorexia, nausea, diarrhea, and other gastrointestinal symptoms in patients with severe COVID-19 [bib_ref] Analysis on clinical efficacy and liver injury of 100 cases of COVID-19..., Xia [/bib_ref]. Treatment of Chengqi decoction series including Da Chengqi decoction, Xuanbai Chengqi decoction, and Jiedu Chengqi decoction based on syndrome differentiation can improve constipation, dry stool, abdominal distension, and other symptoms in patients with severe COVID-19 [bib_ref] Analysis on clinical efficacy and liver injury of 100 cases of COVID-19..., Xia [/bib_ref]. Early use of TCM medications such as Circada Moulting (Chantui), Body of Sick Silkworm (Jiangcan), and lumbricus (Dilong), Red Peony Root (Chishao), Peach Kernel (Taoren), and the Salvia Root (Danshen), with the effects of "dispelling wind, dredging collaterals, and resolving hard lumps" may reduce the severity of pulmonary fibrosis; for those who do not have high fever, Guizhi Fuling decoction (pill) could also be considered for treatment [bib_ref] Deciphering the potential pharmaceutical mechanism of GUI-ZHI-FU-LING-WAN on systemic sclerosis based on..., Wang [/bib_ref].
6.6. 6.6Clinical Question 6: How to carry out integrated TCM and western medicine treatment for patients recovering from severe COVID-19?

## Recommendation 14
All patients before hospital discharge or those experienced persistent symptoms and/or functional limitations after hospital discharge should be screened for rehabilitation needs in terms of physical, cognitive, and mental disorders, to facilitate onward referral and/or be managed timely (consensus recommendation).

## Rationale
All patients with COVID-19 before hospital discharge should be screened for rehabilitation needs (including physical deconditioning, and respiratory, swallow, cognitive or mental health disorders) to facilitate onward referral; patients who have been discharged from the hospital and experienced persistent symptoms and/or functional limitations should also be screened for rehabilitation needs to be managed in a timely manner.

## Recommendation 15
All severe COVID-19 patients should be provided with education and support for self-management of breathlessness and resumption of activities. (consensus recommendation).

## Rationale
Patients with severe COVID-19 are more likely to have severely impaired pulmonary diffusion capacity and abnormal chest imaging manifestations, and therefore, are the main target population for longterm recovery intervention [bib_ref] Cao, 6-month consequences of COVID-19 in patients discharged from hospital: a cohort..., Huang [/bib_ref]. All severe COVID-19 patients should be educated and supported. Education on breathing control, such as high side lying, forward lean sitting, pursed lip breathing, and square box breathing, can support patients recovering from respiratory illness. Appropriate walking pace regulation is recommended to reduce breathlessness and prevent oxygen desaturation on exertion. All rehabilitating patients should be educated to resume daily activities conservatively at an appropriate pace that is safe and manageable, and the increase of exercise should be gradual and based on symptoms.

## Recommendation 16
The general TCM pathogenesis of patients recovering from severe COVID-19 is "unexhausted evil Qi and unrecovered healthy Qi", and the specific pathogenesis is mainly characterized by "deficiency, stasis, and dampness". The basic TCM syndromes are "Qi deficiency of the lung and spleen, and Qi and Yin deficiency", which are conditionally combined with "uncleared toxin and phlegm-stasis blocking collaterals" (consensus recommendation).

## Rationale
The general pathogenesis of patients recovering from severe COVID-19 is characterized by "unexhausted evil Qi (epidemic toxin) and unrecovered healthy Qi". Although the epidemic toxin has been attenuated, the body's Yin and Yang were both damaged, both Qi and Yin were injured, and the epidemic toxin was difficult to be dispelled, which results in the TCM syndrome of "origin deficiency and superficial actuality" or "a mixture of deficiency and actuality". Specific pathogenesis is mainly "deficiency, stasis, and dampness". The pathogenesis "Qi deficiency, Yin deficiency, lung and spleen deficiency" belongs to "origin deficiency", and the pathogenesis "stasis, dampness, and unexhausted epidemic toxin" belongs to "superficial actuality". The basic TCM syndrome can be summarized as "Qi deficiency of the lung and spleen, and deficiency of both Qi and Yin" combined with "uncleared toxin" or "phlegm-stasis blocking collaterals" [bib_ref] Analysis of TCM syndrome types in the recovery period of novel coronavirus..., Min [/bib_ref].

## Recommendation 17
For the management of function disorders, pulmonary fibrosis, mental health problems, decreased mobility, glucocorticoids sequelae, and recurrence of positive RT-PCR test results that patients who recovering from severe COVID-19 may experience, TCM decoctions and CPMs with syndrome differentiation are recommended (strong recommendation, low evidence quality). TCM therapy such as acupuncture and moxibustion, manipulation, auricular points therapy, skin-scraping therapy, cupping, foot bath, diet therapy, and emotional therapy, or traditional Chinese excises such as Baduanjin and Tai-chi, are also recommended (strong recommendation, moderate evidence quality).

## Rationale
A cohort study [bib_ref] Clinical study on integrated traditional Chinese and western medicine therapy to improve..., Zhang [/bib_ref] showed that, in combining with UC, the TCM decoction series of Yiqi Yangyin (YQYY) decoction, Bufei Jianpi (BFJP) decoction, and Yangyin Qingre (YYQR) decoction, together with Xiaoyao powder, which has the effect of "soothing the liver to relieve depression", "nourishing spleen and harmonizing Ying", and "eliminating the remaining evil Qi (epidemic toxin)", were used with modification according to the patient's specific condition; they significantly improved the life quality of patients recovered from SARS in ten aspects, including asthmatic, cycling, shopping, stairs climbing, chest tightness, melancholy, anger, restricted activity, worrying about the present, and worrying about the future. A treatment protocolrecommended that patients recovered from COVID-19 can be treated with acupuncture and moxibustion, manipulation, auricular points therapy, skin-scraping therapy, cupping, and other non-oral drug TCM therapies; diet therapy and emotional therapy; or traditional Chinese excises including the Baduanjin and Tai-chi. A cohort studyshowed that the comprehensive treatment based on syndrome differentiation, including TCM decoction, CPM, acupuncture, foot bath, and Baduanjin exercise, can significantly reduce the recurrence of positive RT-PCR test results of the viral nucleic acid in patients recovered from COVID-19.
For patients with severe COVID-19 treated with glucocorticoids, sequela may occur after discontinuation, such as femoral head necrosis (FHN), which is the most common and should be prevented early. The main TCM syndrome of FHN is "fire excess from Yin deficiency" and "deficiency of both Yin and Yang" combined with "blood stasis and phlegm-dampness", which can be treated with Liuwei Dihuang pill, Jinkui Shenqi pill, or Jisheng Shenqi pill based on syndrome differentiation [bib_ref] Concerns and suggestions for management of coronavirus disease 2019 in convalescence with..., Wang [/bib_ref]. For convalescent patients with severe COVID-19, prompt identification and assessment as well as early warning mechanism for possible adverse mental states should be established, and psychosocial support strategies and first-line intervention should be initiated for management. (consensus recommendation).

## Rationale
More than 60% of COVID-19 patients may experience adverse mental states such as anxiety and depression [bib_ref] Investigation of psychological status of patients with COVID-19 and analysis of related..., Chen [/bib_ref] [bib_ref] Mental health status and psychological intervention of patients with new coronavirus pneumonia..., Yang [/bib_ref]. An evidence-based guidelineand a treatment protocolsuggested establishing a dynamic evaluation and warning mechanism for prompt identification, assessment, and intervention of possible psychological crises. For patients with mild adverse mental states, psychological self-adjustment including breath relaxation training and mindfulness training is recommended. For patients with moderate to severe adverse mental states, intervention by combining medication and psychotherapy is suggested. For patients experiencing anxiety and depression, basic psychological interventions such as psychological first aid, stress management, and brief psychological interventions based on the principles of cognitive behavior therapy should be considered. For severe anxiety, medications, especially those with a short half-life and low risk of drug-drug interactions, at the lowest possible dose and the shortest possible duration as can be considered.

## Recommendation 19
It is recommended to provide basic mental health and psychosocial support to all patients with severe COVID-19 by asking and addressing their needs and concerns. (consensus recommendation).

## Rationale
Basic mental health and psychosocial support is essential for the treatment of patients and is an indispensable part of medical care for different groups affected by COVID-19, including severe patients. Patients should continue receiving mental health and psychosocial support and be followed up after hospital discharge to ensure that their symptoms continue being improved.

## Recommendation 20
For anxiety, fear, depression, somatization symptoms, and other adverse mental states that severe COVID-19 patients may experience, psychological counseling, mental health education, and non-drug treatment such as Tai Chi, breathing relaxation training, mindfulness training, cognitive behavioral therapy, and group intervention are recommended (strong recommendation, low evidence quality). Symptomatic treatment combined with TCM decoctions based on syndrome differentiation, which follows the therapeutic method of "soothing the liver and relieve depression, reinforcing earth (spleen) to strengthen metal (lung)" and "eliminating the remaining evil Qi", is also suggested (weak recommendation, low evidence quality).

## Rationale
Two before-after studies [bib_ref] Mental health status and psychological intervention of patients with new coronavirus pneumonia..., Yang [/bib_ref] [bib_ref] The influence of Taijiquan on depression and hope level of patients with..., Xu [/bib_ref] showed that psychological counseling, mental health education, cognitive behavioral therapy, mindfulness therapy, group intervention, and Tai Chi can significantly improve the adverse mental status of COVID-19 patients, such as anxiety, fear, depression, and somatization symptoms. Furthermore, two RCTs [bib_ref] Clinical study on integrated traditional Chinese and western medicine therapy to improve..., Zhang [/bib_ref] [bib_ref] Effect of integrated traditional Chinese and western medicine treatment on 85 cases..., Bian [/bib_ref] showed that symptomatic treatment combined with TCM decoctions, including YQYY decoction, BFJP decoction, and YYQR decoction, based on syndrome differentiation, which has the effect of "soothing the liver and relieve depression, reinforcing earth (spleen) to strengthen metal (lung)" and "eliminating the remaining evil Qi", can significantly improve sadness, depression, anger, worry, and other adverse mental states of COVID-19 patients. Rehabilitation care should be implemented as soon as possible for patients with severe COVID-19, which could be carried out in parallel with the treatment of the disease according to the correct assessment (consensus recommendation).

## Rationale
In case of stable oxygenation and hemodynamics, passive and active activities should be carried out as soon as possible to promote sputum drainage and pulmonary rehabilitation. Interventions could be initiated by rehabilitation professionals in the acute phase of the disease to reduce respiratory distress, prevent complications, and support communication. The timing of the start of rehabilitation care should be decided by the multidisciplinary team based on the medical condition of the patient.

## Recommendation 22
For potential impaired pulmonary function and pulmonary fibrosis in convalescent patients with severe COVID-19, pulmonary rehabilitation training and TCM decoction according to syndrome differentiation, which follows the therapy method of "reinforcing earth (spleen) to strengthen metal (lung), eliminating phlegm to dredging collaterals" and "eliminating the remaining evil Qi (epidemic toxin)", are suggested (weak recommendation, low evidence quality); Baduanjin, Tai-chi, 6character breathing exercise, posture management, breathing exercise management, and other Chinese and western non-drug treatments are also suggested (strong recommendation, low evidence quality).

## Rationale
A systematic review [bib_ref] Effectiveness of pulmonary rehabilitation in interstitial lung disease including coronavirus diseases: a..., Reina-Gutierrez [/bib_ref] of interstitial lung disease (including pulmonary fibrosis after severe COVID-19 infection) showed that pulmonary rehabilitation training, including combined exercise (aerobic with strength), combined exercise with specific respiratory exercises, and aerobic exercise with specific respiratory muscle training, significantly improved pulmonary function (forced vital capacity), exercise capacity (6-minute walking distance), and health-related quality of life of convalescent patients with severe COVID-19. Three RCTs [bib_ref] Clinical study on integrated traditional Chinese and western medicine therapy to improve..., Zhang [/bib_ref] [bib_ref] Effect of traditional Chinese medicine treatment on lung function and quality of..., Chen [/bib_ref] [bib_ref] Clinical observation on intervention of series of Chinese herbal medicines on pulmonary..., Bian [/bib_ref] showed that, for SARS convalescent patients, TCM decoctions such as YQYY decoction, BFJP decoction, and YYQR decoction, based on syndrome differentiation and following the therapy strategy of "reinforcing earth (spleen) to strengthen metal (lung), eliminating phlegm to dredging collaterals" and "eliminating the remaining evil Qi (epidemic toxin)", can significantly improve the chest x-ray manifestations of pulmonary fibrosis (blindly scored by the specialized radiologist, in principle based on the density and extent of shadows on chest radiographs), total lung capacity, diffusion capacity for carbon monoxide, and symptoms such as dyspnea and chest distress. Two treatment protocolssuggested using posture management, breathing exercise management, or TCM health-preserving exercises such as Baduanjin and Tai-chi, and 6-character breathing exercise for pulmonary function recovery.

# Conclusion
This is the first guideline for the management of severe COVID-19 by integrated Chinese and western medicine, based on a systematic search of evidence applying the GRADE classification system. As there is still a discrepancy between existing studies and clinical practice due to the suddenness of the epidemic, a large number of high-quality studies are needed in the field of integrated Chinese and western medicine for severe COVID-19, especially for the old patients, as they are the main focus of the severe COVID-19. Because of the inadequacy or lack of clinical evidence, some of the recommendations are of weak recommendation level. Therefore, we suggest physicians make appropriate choices when applying them in clinical practice by considering the actual conditions and values of the patients. Moreover, as the population of patients grows, the rehabilitation of COVID-19, including the management of long-COVID/PACS, has become a facing challenge, while high quality studies remain inadequate. TCM has advantages in long-COVID management for its strengths in rehabilitation, individualized treatment, and self-immunity enhancement, and therefore, will be the focus of the guideline update. In addition, users of this guidelines are welcome to provide valuable suggestions and comments through clinical practice, and we will continue improving them in the next edition.

# Funding
This work was supported by the Key Project "Emergency Prevention and Treatment of COVID-19  of the Zhejiang Provincial Natural Science Foundation of China (grant number LEZ20H190001).

# Declaration
All authors declare that there is no conflict of interest. The opinions covered in this guide should not be used for commercial promotion or publicity.
[fig] Figure 1: Guideline development process. [/fig]
[fig] 6. 7: Clinical Question 7: How to improve the mental health of patients recovering from severe COVID-19 with integrated TCM and western medicine? 6.7.1. Recommendation 18 [/fig]
[fig] 6. 8: Clinical Question 8: How to help rehabilitate pulmonary function in patients with severe COVID-19 with integrated TCM and western medicine? 6.8.1. Recommendation 21 [/fig]
[table] Table 1: Evidence quality grades and strength of recommendations. [/table]
[table] Table 2: WHO severe COVID-19 definition. [/table]
[table] Table 3: Definition of severe COVID-19 in the Diagnosis and treatment of COVID-19 (8th trial edition). meet any of the following criteria:1. Shortness of breath, respiratory rate (RR)  30 breaths/min; 2. Oxygen saturation  93% on air inhalation at rest state; 3. Arterial partial pressure of oxygen (PaO 2 )/inhaled oxygen concentration (FiO 2 ) Refusal of food or feeding difficulties, with signs of dehydration. [/table]