Non-severe pulmonary embolism: prognostic CT findings

Area of Science:

• Cardiology
• Radiology
• Pulmonology

Background:

• Pulmonary embolism (PE) poses a significant mortality risk, even in clinically non-severe cases.
• Predictive markers for mortality in non-severe PE are crucial for risk stratification.
• Computed tomography (CT) offers detailed cardiovascular and embolic burden assessment.

Purpose of the Study:

• To retrospectively evaluate CT-derived cardiovascular parameters and pulmonary artery clot load score.
• To determine their predictive value for 3-month mortality in patients with non-severe PE.
• To identify key predictors of mortality in this patient cohort.

Main Methods:

• Retrospective analysis of 226 CT scans in hemodynamically stable patients with PE.
• Independent review of CT scans by two observers assessing interventricular septum shape and right/left ventricle (RV/LV) diameter ratio.
• Cox regression analysis to compare CT parameters with 3-month mortality.
• Multivariate analysis incorporating lower limb deep vein thrombosis (DVT) and comorbidities.

Main Results:

• A RV/LV diameter ratio >1 was predictive of death (OR, 3.83; p < 0.01) specifically when embolic burden was < 40%.
• Interobserver agreement was moderate for interventricular septum shape (κ = 0.41) and substantial for RV/LV ratio (κ = 0.76).
• CT cardiovascular parameters, as a group, were not associated with death in the multivariate model. Lower limb DVT and comorbidities were significant predictors.

Conclusions:

• In non-severe PE, an elevated RV/LV diameter ratio is a significant predictor of mortality, particularly in cases with low embolic burden.
• CT-derived cardiovascular parameters alone are insufficient for predicting mortality in non-severe PE.
• Concomitant lower limb DVT and comorbid conditions are critical factors influencing mortality in patients with non-severe PE.