obesity

This observational study used a large audit dataset to examine the relative effects of patient-related factors and those related to the pulmonary embolism (PE) on longer-term mortality after PE. We identified that longer-term mortality is higher in provoked compared to unprovoked PE and that, in this group, obesity is relatively protective. Simplified PE severity index (sPESI), known to link to short term mortality, remains predictive in the longer-term and there is no relationship of mortality to right heart strain or extent of clot. Interestingly mortality is higher in those with negative CTPA scans than those with PE. These clinically important results should encourage careful, holistic clinical assessment of patients in these groups prior to discharge to look for treatable comorbidities.

In the context of a significant increase in obesity rates, quantifying the relationship between body mass index (BMI) and risk of pulmonary embolism (PE) is an essential component of accurate clinical risk assessment. This observational study is the first to explore this association by clinician-defined cause of the PE. We demonstrate that the association between BMI and PE is driven by patients with otherwise ‘unprovoked’ PE where there is a strong positive correlation with odds ratios equivalent to well-recognised major risk factors such as cancer, pregnancy and surgery. We make a case for the inclusion of BMI in risk-prediction tools.