Tests losartan in adults with heart disease risk from secondhand smoke

Trial details

Who runs it

University of California, San Francisco

Trial code

NCT04715568

Record updated

19 August 2026

Original description

This is a double-blind randomized placebo-controlled crossover clinical trial of efficacy and safety of an FDA-approved angiotensin receptor blocker (losartan) to improve cardiopulmonary outcomes in individuals with pre-Chronic Obstructive Pulmonary Disease (COPD) due to prolonged exposure to secondhand tobacco smoke.Read full original descriptionShow less

Occult Cardiovascular Disease With Chronic Exposure to Secondhand Tobacco Smoke

This is a double-blind randomized placebo-controlled crossover clinical trial of efficacy and safety of an FDA-approved angiotensin receptor blocker (losartan) to improve cardiopulmonary outcomes in individuals with pre-Chronic Obstructive Pulmonary Disease (COPD) due to prolonged exposure to secondhand tobacco smoke.

Inclusion: Must be able to understand and provide informed consent; Adults >= 40 years of age; Must have a history of occupational exposure to secondhand tobacco smoke for at least 5 years such as flight attendants who worked for airlines before the smoking ban on aircrafts went into effect or casino workers who worked at casinos with no smoke-free policies; Must have never smoked or have a remote history of light smoking defined as follows:; Lifetime smoking history equivalent to < 1 pack-year and; No smoking history for >= 20 years at the time of enrollment.

Exclusion: Current therapy with angiotensin converting enzyme (ACE) inhibitor or angiotensin receptor blocker (ARB); Known intolerance to ACE inhibitor or ARB; Significant history of recreational drug use other than marijuana as defined by: recreational drug use within the last 30 years of recruitment (or) recreational drug use at a frequency of more than once a month before 30 years; Concomitant participation in another interventional study; History of angioedema; Conventional indication for ACE inhibitor or ARB (e.g., history of myocardial infarction, known cardiomyopathy); History of clinically overt pulmonary disease that may interfere with study procedures, including: greater than mild asthma, COPD, emphysema, chronic interstitial lung disease, and pulmonary hypertension; Neuromuscular disorders or physical disability to perform exercise testing using an ergometer; Other uncontrolled chronic illnesses which in the judgment of the study physician would interfere with completing study procedures; Failure to keep screening appointments or other indicators of non-adherence; Renal insufficiency (Creatinine Clearance <30 mL/min by Cockcroft-Gault calculation); Potassium supplementation or serum potassium level of 5.0 milliequivalents (mEq)/dL or higher at V1; Current use of a potassium sparing diuretic; History of clinically overt cardiovascular disease including: stable or unstable angina; chest discomfort and dyspnea with baseline exertion; symptomatic coronary artery disease (as defined by history of abnormal stress test; cardiac catheterization showing >70% coronary artery stenosis; history of revascularization; pathologic Q waves on EKG); poorly controlled resting hypertension (SBP>160/ DBP>95); congestive heart failure (CHF) (as defined by left ventricular ejection fraction (LVEF) <55%; physical exam findings of CHF; symptomatic pulmonary edema); significant (>mild) valvular heart disease; congenital heart disease; cardiac arrhythmias including frequent premature atrial or ventricular contractions (>5 per minute); Inability or unwillingness of a participant to give written informed consent or comply with study protocol; Subject is pregnant, breast-feeding, or plans to become pregnant; Blood pressure less than 90 mm Hg systolic or 60 mm Hg diastolic while standing or sitting; Known unilateral or bilateral renal artery stenosis higher than 70%; Current regular use of NSAIDs defined as daily use on 5 or more days of the week for more than one month; Marijuana use more than once a week; Subjects with BMI <15 or >40 kg/m2; MRI Scan Participation Exclusion Criteria - The participants will be excluded from the MRI portion of the study if they have a metallic object embedded or implanted in their body that is incompatible with Magnetic Resonance (MR) scanning, including MR incompatible pacemaker or defibrillator.

ClinicalTrials.gov NCT04715568