In March 2020, New York City (NYC) became the epicenter of the coronavirus disease 2019 (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). To date, there have been 385,760 positive cases in New York state [1] .
Patients with end-stage kidney disease (ESKD), including those on peritoneal dialysis (PD), have multiple comorbidities and a weakened immune system, making them more susceptible to infection than the general population [2] . During the COVID-19 pandemic, outpatient home dialysis center policies and procedures changed in order to practice better infection control and to decrease DOI: 10.1159/000510259 community spread. This pandemic has affected the ESKD population, with high mortality rates reported among patients on hemodialysis (HD) [3] . However, the degree to which it has affected the PD population in the United States (US) has not yet been elucidated [4, 5] . Herein, we describe the clinical characteristics, presentations, clinical course, and outcomes of ESKD patients on PD hospitalized with COVID-19.
This is a case series of patients with ESKD on chronic PD hospitalized with COVID-19 in 13 hospitals of a large health system in the New York City area. Data were obtained from the enterprise inpatient electronic health record Sunrise Clinical Manager (Allscripts, Chicago, IL). All adult patients (age ≥ 18 years) with prevalent ESKD on PD who tested positive by PCR testing of a nasopharyngeal sample for COVID-19 from March 1, 2020, to April 27, 2020, were eligible. The patients were followed up through June 15, 2020. For patients who had multiple qualifying hospital admissions, we included only the first hospitalization. 10 (91) CAD, n (%) 1 (9) Heart failure, n (%) 0 PVD, n (%) 0 Asthma, n (%) 1 (9) COPD, n (%) 0 Liver disease, n (%) 0 Kidney transplantation, n (%) 1 (9) Cancer, n (%) 0 CAD, coronary artery disease; COPD, chronic obstructive pulmonary disease; PVD, peripheral vascular disease; PD, peritoneal dialysis. For hospitalized patients, we identified patients with ESKD on PD through the following mechanisms: (1) presence of providerentered discrete comorbidity of ESKD (International Classification of Diseases, Tenth Revision [ICD-10] code N18.6); (2) independent adjudication of the ESKD diagnosis and PD status through manual chart review of hospital admission and nephrology consultation notes to ensure patients had prevalent ESKD (J.S.H.); and (3) presence of dialysis orders specifically for the PD procedure.
We collected data on patient demographics, baseline history of comorbid conditions, medications, dialysis-specific data elements, and details of the hospital admissions. Comorbid conditions and home medications were determined from provider-entered past medical history and admission medication reconciliation. Clinical presentation, imaging findings, episode of peritonitis, modality of PD, PD orders, and ventilatory settings were collected using manual chart review (M.S., D.M., and N.N.U.). We collected details during hospital admission such as intensive care unit (ICU) stay, need for mechanical ventilation, vasopressor support, hospital length of stay, death, discharge, and baseline laboratory test results within 48 h of hospital admission. Due to the COVID-19 pandemic, many additional ICUs were created in nontraditional hospital areas and units. Hence, ICU stay was defined as either one of the following: need for invasive mechanical ventilation, need for vasopressor or inotrope support, under the care of an ICU service, or in a known ICU location. As the overall number of patients receiving PD was small, only descriptive statistical analysis was performed. The Institutional Review Board of Northwell Health approved the study protocol before the commencement of the study.
We identified 11 patients with ESKD on PD hospitalized with COVID-19 (out of a total of 419 hospitalized patients with ESKD [2.6%]). The median age was 54 years, with 4 (36%) patients aged less than 40, 3 (27%) aged 50-59, and 3 (27%) aged 60-69 years. The majority of those admitted were female (8 of 11 [73%]) and 5 (45%) were non-Hispanic black. The patients were on an average of 8 home medications, 2 were on angiotensin-converting enzyme inhibitors, and 1 was on immunosuppressive medications (prednisone and tacrolimus). Five of the 11 patients received erythropoietin-stimulating agents during the hospitalization.
Ten patients had hypertension, 5 had diabetes mellitus, 2 had systemic lupus erythematosus, 1 had coronary artery disease, 1 had asthma, and 1 had a history of a prior failed kidney transplant. None of the patients had any underlying malignancy. Four (36%) patients were overweight, and another 4 (36%) were obese. Nine reported no smoking history, and 2 were former smokers. Table 1 summarizes the baseline demographics and characteristics of these patients.
The most commonly reported presenting symptoms were fever (present in 7 of 11 [64%]) and diarrhea (6 of 11 [55%]), followed by shortness of breath (5 of 11 [45%]), cough (5 of 11 [45%]), and myalgias (4 of 11 [36%]). Less commonly reported symptoms included vomiting in 2 (18%), abdominal pain in 2 (18%), agitation in 1 (9%), vertigo in 1 (9%), and loss of taste or smell in 1 (9%). Seven patients reported positive SARS-CoV-2 exposure from a member of their household.
Initial chest radiographs showed bilateral opacities in the majority, 9 of 11 patients (82%). One patient had unilobar pneumonia, and another had no acute findings on chest radiograph. Table 2 summarizes the clinical presentation, imaging findings, and outcomes of these patients. hours of admission for these patients and the inpatient orders for PD. The hospital course was complicated by ICU stay in 3 of 11 patients (27%), all of whom required mechanical ventilation. Among the patients ventilated and who were on PD, one had a decrease in the plateau pressure from 36 to 29 cm H 2 O and another had no significant change in plateau pressure, which remained at 20 cm H 2 O despite being on PD. Seven patients received continuous ambulatory PD (CAPD), and 4 patients were on automated PD during the hospitalization. One patient in the ICU received HD temporarily for one day due to severe hyperkalemia, with subsequent transition back to CAPD.
Three patients were diagnosed with culture-negative peritonitis during hospitalization. None of the 3 patients with peritonitis died. Online suppl. Table 2 shows the cell counts of the patients treated for peritonitis and their antibiotic course and duration.
The length of hospital stay ranged from 2 to 23 days, with the average length of stay being 9 days. Two of the 11 (18%) patients expired, both of whom required mechanical ventilation and died within 4 days of admission (Table 2 ). Both patients continued on CAPD until the day of expiration. Nine patients (82%) were discharged home, and one was readmitted for worsening pneumonia.
In this report, we describe the characteristics, presentation, and outcomes of ESKD patients on chronic PD hospitalized with COVID-19. Of 419 hospitalized patients with ESKD, 11 were on chronic PD therapy (2.6%). Among those 11, three patients required mechanical ventilation, two of whom died. Of the entire cohort, 9 of the 11 patients (82%) were discharged alive. All but one patient were continued on PD without any significant electrolyte or volume-related concerns, and two of the patients on ventilator had either no change or improvement in their plateau pressures, making PD a viable option for those with COVID-19 infection and on mechanical ventilation.
Like all patients with ESKD, those on PD carry an increased risk of infection due to their immunosuppressed state and comorbid conditions. While some established risk factors for severe illness with COVID-19 such as advanced age, diabetes mellitus, and hypertension were present in our cohort, others such as heart disease, obesity, and cancer were less common or absent entirely [6] . Despite the risk factors, they seemed to do fairly well.
Data for hospitalized patients on HD are slowly emerging, yet there are no reports of the burden of illness of COVID-19 in the PD population. Most studies from Europe, the US, and China show a high mortality rate for HD patients [3] [4] [5] 7] . In one single center study from the US, only 2 of 59 hospitalized patients with ESKD and CO-VID-19 were on PD [3] . We did not observe a large number of patients hospitalized with this illness possibly owing to the ability of PD patients to perform dialysis at home and socially distance from others as opposed to incenter HD patients, PD patients being highly trained toward proper hygiene, and new policies and procedures that were put in place by outpatient PD units in an effort to decrease risk. In our population of admitted patients on PD, most did not require mechanical ventilation and were discharged home. Despite that, given our small sample size, definitive conclusions regarding mortality in hospitalized patients on PD with COVID-19 are not possible.
Commonly reported symptoms associated with CO-VID-19 include fever, cough, and shortness of breath [8] . While fever was a common presentation, more than half of our patients also presented with diarrhea. One patient presented with diarrhea, abdominal pain, and myalgias, and another presented with only diarrhea and abdominal pain. Neither of these patients had the typical cough or shortness of breath. Our findings suggest the importance of assessing atypical symptoms of COVID-19, especially gastrointestinal symptoms in the PD population, and taking appropriate infection control precautions and diagnostic measures when these atypical symptoms are identified.
Interestingly, 3 patients were diagnosed with culturenegative peritonitis during their hospitalization. None of these patients died. Owing to the temporal relationship of the COVID-19 illness and peritonitis, it is possible that SARS-CoV-2 might have been responsible for the peritonitis. Whether this is a direct effect of the virus, hematogenous spread, touch contamination, the effect of inflammatory mediators, superimposed bacterial translocation due to diarrhea, or another issue remains uncertain, although Vischini et al. [9] previously reported peritoneal dialysate being positive for SARS-CoV-2 in a COVID-19 patient.
Limitations of this case series include the small sample size and the observational nature of the data collection from the electronic medical record. The study was unable to obtain prevalence data as several different outpatient units admit to our enterprise hospitals and our electronic medical record system was not able to capture Am J Nephrol 2020;51:669-673 DOI: 10.1159/000510259 that. However, these data come from a diverse population of over 11,000 patients hospitalized at 13 hospitals in the New York area, the epicenter of the COVID-19 outbreak.
In conclusion, we describe a series of patients with ESKD on chronic PD hospitalized with COVID-19 disease during the peak of the pandemic. We found that most patients had a relatively mild course and were discharged home. Further studies are needed to understand the absolute risk of infection in patients on PD and the spectrum of the burden of illness including presentation, complications of illness, and outcomes.