This study combined data from many observational research projects to look at patients with asthma. The goal was to see if having asthma was connected to a higher risk of developing venous thromboembolism, which includes deep vein thrombosis and pulmonary embolism. The analysis looked at different types of studies, including cohorts, case-control, and cross-sectional designs.
The results showed that people with asthma had 1.61 times higher odds of overall venous thromboembolism. Specifically, the risk of pulmonary embolism was 2.41 times higher, and the risk of deep vein thrombosis was 1.56 times higher. The connection appeared strongest in cohort studies, where the odds were 4.21 times higher. Risk levels also varied by region, with the highest odds found in Asia.
Readers should understand that these numbers represent odds, not absolute risk. Since the study relied on observational data, it cannot prove that asthma causes blood clots. Other factors might explain the link. This information is not meant to change how doctors manage asthma or treat patients right now.