A Mendelian randomization study found that genetically predicted obstructive sleep apnea significantly increases the risk of pulmonary hypertension by 20%, establishing a causal relationship between the two conditions.
- Genetic analysis confirms obstructive sleep apnea (OSA) causes a 20% increased risk of pulmonary hypertension
- The study used Mendelian randomization to eliminate confounding factors that clouded previous observational research
- No reverse causal relationship was found—pulmonary hypertension does not appear to cause OSA
How this compares to prior research
Clinical observational studies have long suggested a complex association between obstructive sleep apnea and pulmonary hypertension, but the causal relationship remained unclear due to confounding factors. Previous research could not definitively determine whether OSA directly causes PH or if the two conditions simply occur together due to shared risk factors. This study addresses that gap by using genetic data to establish causation.
Prevalence trends in respiratory conditions, global data, 1990–1999
Key findings
- Genetically predicted obstructive sleep apnea showed a significant positive causal relationship with pulmonary hypertension (OR = 1.20, 95% CI [1.01-1.43], P = 0.04)
- Bidirectional analysis found no significant reverse causal relationship from pulmonary hypertension to obstructive sleep apnea (OR = 1.00, P = 0.99)
- Meta-analysis of multiple Mendelian randomization outcomes confirmed the causal link between OSA and PH across European population genome-wide association studies
What this means in practice
- Ask your doctor about pulmonary hypertension screening if you have been diagnosed with obstructive sleep apnea
- Consider treating sleep apnea promptly to potentially reduce your risk of developing pulmonary hypertension
- If you have OSA symptoms like loud snoring or daytime fatigue, seek medical evaluation to prevent cardiovascular complications
Frequently asked questions
What is the connection between sleep apnea and pulmonary hypertension?
This study found that obstructive sleep apnea causes a 20% increased risk of developing pulmonary hypertension, establishing a direct causal relationship rather than just an association.
How is this study different from previous research on OSA and PH?
Unlike observational studies that can be affected by confounding factors, this study used Mendelian randomization—a genetic approach that provides stronger evidence of causation.
Does pulmonary hypertension cause obstructive sleep apnea?
No, the study found no evidence of a reverse causal relationship. OSA appears to cause PH, but PH does not cause OSA.
Key terms explained
Mendelian randomization
A genetic research method that uses inherited DNA variations to determine if one condition actually causes another, reducing bias from confounding factors.
Pulmonary hypertension
High blood pressure in the arteries of the lungs, which makes the heart work harder to pump blood through the lungs.
Genome-wide association studies (GWAS)
Research that scans complete sets of DNA from many people to find genetic variations associated with specific diseases.
Source: Genetic assessment of the causal relationship between obstructive sleep apnea and pulmonary hypertension: Mendelian randomization and meta-analysis. · DOI: doi: 10.1016/j.rmed.2026.108760