HighCycle: Effect of Acetazolamide on Pulmonary Artery Pressure in Women Compared to Men

The HighCycle study is a randomized clinical trial testing whether acetazolamide — a medication commonly used to prevent altitude sickness — affects pulmonary artery pressure (blood pressure in the arteries of the lungs) differently in women compared to men when traveling to an altitude of 3,600 meters. High altitude causes the lungs' blood vessels to constrict, which can strain the heart, and researchers want to know if this response and the drug's protective effect differ by sex. Healthy non-smoking adults aged 18–44 with a BMI between 18 and 30, currently living below 1,000 meters altitude, and not using any regular medications are eligible; women must have regular menstrual cycles and must not be using hormonal contraceptives or be pregnant. Participation involves travel to high altitude, taking acetazolamide or placebo, and having pulmonary artery pressure measured. This summary was prepared as patient-facing educational content using AI assistance.