Management and outcome of high-risk pulmonary embolism in intensive care units: results from a retrospective single-center analysis
Authors: Colombo C N J , Guglielmi A , Caneva L , Patrini L , Rossi F , Ambrosini E , Turco A , Capra Marzani F , Scelsi L , Pagani M , Camporotondo R , Ghio S , Tavazzi G 
Published: May 2024

Abstract

Funding Acknowledgements
None.

Background
High-risk pulmonary embolism (PE) patients are exposed to hemodynamic/multiorgan compromise including hypotension, cardiogenic shock and/or cardiac arrest (CA). Few data exist on management and outcome in patients admitted to intensive care units (ICU) with high-risk PE.

Purpose
We sought to analyse the epidemiology, management and outcome of patients admitted to ICU due to high-risk PE.

Methods
Retrospective monocentric analysis of adult patients with high-risk PE admitted from 2017 to 2023; COVID-19 patients were excluded. Demographic, clinical presentation, management and outcome data have been collected. Descriptive analysis comparing means adjusted for organ involvement severity and Cox regression were performed.

Results
85 patients (55 male, 63±12 years old, BMI 29.06± 6) were included in the analysis. All patients received the diagnosis through the computed tomography angiography except 4 of them who underwent extra-corporeal cardiopulmonary resuscitation (eCPR) and the diagnosis was made with trans-oesophageal echocardiography. Overall mortality was 32%, eCPR rate was 9%. 92% were treated with adrenergic drugs (norepinephrine 78%, dobutamine 65%, epinephrine 35%); 7 patients required VA-ECMO due to CA. 42 patients received mechanical ventilation (MV) during the first 12 hours; those patients had higher rate of CS (p &lt;0.001), higher lactates (mean difference 1.45±3.2; p &lt;0.001), higher SOFA and SAPS II scores (respectively, mean difference 12.5±0.49 and 7.9±3.4; p 0.004). 75 patients underwent systemic thrombolysis. 10 patients with contraindication to systemic thrombolysis, underwent catheter directed thrombolysis (CDT); in 6 cases CDT was preceded by mechanical suction thrombectomy. Patients undertaking CDT had higher SOFA score at admission (mean difference 2.45±1.6; p 0.04), worsen creatinine (p &lt;0.001), lower PaCO2 (mean difference -0.54±5.3; p 0.01), higher PaO2 (mean difference 28.7±6.5; p 0.009), higher bilirubin (mean difference 3.2±1.6; p &lt;0.001) and lower systolic blood pressure (mean difference -6.8±3.36; p 0.01). At the Cox regression, higher lactates (HR 1.45 [0.40-0.99], p 0.004, panel A), lower glomerular filtration rate (HR 1.1 [1.02-1.09], p 0.001, panel B), higher bilirubin (HR 2.6 [1.20-6.03,] p 0.016), higher ALT (HR 1.07 [0.95-0.99], p 0.04), lower PaO2/FiO2 ratio (HR 1.1 [0.97-0.99], p 0.024, panel C), MV (HR 1.1 [0.78-7.58], p 0.04, panel D) and VA-ECMO (HR 2.5 [1.25-3.54], p 0.002) were associated with increased mortality; CDT was associated with lower mortality (HR 0.82 [0.68-1.89], p 0.04).

Conclusions
High-risk PE was burdened by high mortality. Signs of worsen organ failure and respiratory and mechanical support are associated with increased mortality. In this monocentric population the use of CDT was performed when systemic thrombolysis contraindicated and it was associated with favourable outcome, although the small sample (10%) should warn contextualization in results’ interpretation.