Cardiac Effects of Mineralocorticoid Receptor Antagonism After Preeclampsia
- Conditions
- Hypertension
- Interventions
- Drug: Eplerenone 100 mg daily plus potassium placeboDrug: Chlorthalidone 25 mg plus potassium 20 mEq daily
- Registration Number
- NCT07238400
- Lead Sponsor
- Massachusetts General Hospital
- Brief Summary
The goal of this clinical trial is to determine if the medication eplerenone yields greater improvements in coronary microvascular function than chlorthalidone in women who experienced preeclampsia during pregnancy and subsequently developed chronic hypertension. The main Aims are:
* To test the hypothesis that, in women with prior preeclampsia, current chronic hypertension, and concentric LV remodeling, eplerenone improves coronary microvascular function vs. chlorthalidone.
* To test the hypothesis that, in women with prior preeclampsia, current chronic hypertension, and concentric LV remodeling, eplerenone improves cardiac structure and function vs. chlorthalidone.
Participants will:
* First receive pre-treatment with Amlodipine for 12 weeks prior to beginning the study medication.
* Start study treatment which involves daily self-administration of two oral capsules (eplerenone + potassium placebo or chlorthalidone + potassium), each taken once a day, for a total of 336 doses over 48 weeks.
* Attend study visits at weeks 2, 12, 24, 36, and 48. These visits will involve collecting information, measuring blood pressure, and gathering blood and urine samples. Echocardiography (cardiac ultrasound), eye exam, and cardiac PET/CT scan will be performed during the baseline and week 48 visits.
- Detailed Description
Preeclampsia, a condition marked by hypertension and systemic endothelial/microvascular dysfunction in late pregnancy, affects 8% of childbearing U.S. women and is associated with two-fold risk of future material cardiovascular disease (CVD). The American College of Cardiology and American Heart Association now recognize preeclampsia as a sex-specific CVD risk factor to guide prescription of preventive statin therapy. Beyond this focused recommendation, however, specific strategies for CVD risk reduction in women with preeclampsia are not yet established. Recent preclinical evidence suggests that preeclampsia induces vascular smooth muscle cell mineralocorticoid receptor (MR) sensitivity that persists postpartum, promoting hypertension and CVD. Although MR signaling is known to underlie hypertension, MR activation also promotes cardiovascular, kidney, and metabolic disease via effects that are partially independent of blood pressure. Work by this team has implicated MR signaling in coronary microvascular dysfunction, a known predictor of heart failure with preserved ejection fraction (HFpEF) and CVD mortality. The central hypothesis is that, among women with prior preeclampsia who subsequently develop chronic hypertension, MR blockade will promote favorable cardiac remodeling and improve coronary microvascular function, independent of changes in blood pressure, and thereby reduce CVD risk in affected women. To test this hypothesis, the investigators propose a randomized, double-blind clinical study in humans. Women aged \<55 years with a history of preeclampsia, current chronic hypertension, and concentric left ventricular remodeling will be randomized 1:1 to receive eplerenone (mineralocorticoid receptor antagonist) or chlorthalidone (thiazide-like diuretic) with potassium supplementation for 48 weeks, targeting equivalent blood pressure control in both groups using daily home blood pressure measurement and 24-hour ambulatory blood pressure monitoring. The investigators will measure coronary microvascular function (myocardial flow reserve, i.e., hyperemic stress/rest myocardial blood flow) quantified by cardiac positron emission tomography (PET/CT) and cardiac structure and function by cardiac ultrasound at baseline and 48 weeks. It is expected that, compared with chlorthalidone, eplerenone will yield greater improvements in coronary microvascular function and myocardial diastolic function after 48 weeks of treatment. If the hypotheses are affirmed, these findings would support the targeted use of MR antagonists much earlier than recommended by current guidelines for the management of hypertension to more effectively prevent HFpEF and other CVD among women with a history of preeclampsia.
Recruitment & Eligibility
- Status
- NOT_YET_RECRUITING
- Sex
- Female
- Target Recruitment
- 90
- Female with a history of preeclampsia (defined by ACOG criteria) in a singleton pregnancy without pre-gestational chronic hypertension.
- Current chronic hypertension (stage 1 or greater).
- Evidence of concentric left ventricular (LV) remodeling, defined as relative LV wall thickness >0.42, with or without LV hypertrophy.
- Age 18-55 years at time of randomization.
- Use of a mineralocorticoid receptor antagonist (MRA) or amiloride within the past 3 months or more than 30 days within the previous 12 months.
- Planned pregnancy, current pregnancy, or lactation.
- Systolic BP >150 mmHg and/or diastolic BP >95 mmHg while on antihypertensives, or systolic BP >160 mmHg and/or diastolic BP >100 mmHg if untreated.
- BMI >45 kg/m².
- Clinical atherosclerotic cardiovascular disease, including coronary, cerebrovascular, or peripheral artery disease.
- Diabetes mellitus.
- LV ejection fraction <40% or history of clinical heart failure (reduced or preserved ejection fraction).
- Hypertrophic or other genetic cardiomyopathy.
- Any moderate or greater valvular heart disease.
- eGFR <60 mL/min/1.73 m².
- Urine microalbumin/creatinine ratio >300 mg/g at screening.
- Abnormal electrolytes, hemoglobin, liver function tests, or TSH at screening or baseline.
- Plasma renin activity <1 mg/mL/hour and aldosterone >20 ng/dL (suggestive of primary aldosteronism).
- Use of oral contraceptives, progestin depot or implant (note: progestin-containing IUD is permitted), or menopausal hormone therapy.
- History of hypersensitivity or intolerance to calcium channel blockers, thiazides, or MRAs.
- Active substance abuse.
- Other serious medical illnesses or concerns about protocol adherence/mortality risk within 15 months.
- Participation in another interventional clinical study.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Eplerenone Eplerenone 100 mg daily plus potassium placebo Participants will receive eplerenone 100 mg daily plus potassium placebo for 48 weeks Chlorthalidone Chlorthalidone 25 mg plus potassium 20 mEq daily Participants will receive chlorthalidone 25 mg plus potassium 20 mEq daily for 48 weeks
- Primary Outcome Measures
Name Time Method Change in Myocardial Flow Reserve (MFR) Prior to randomization and after 48 weeks of randomized study treatment. Subjects will undergo 13N cardiac PET imaging at baseline and after 48 weeks of randomized study treatment. Myocardial blood flow (MBF) will be determined during the stress and rest conditions. Myocardial flow reserve will be calculated as stress MBF divided by rest MBF.
- Secondary Outcome Measures
Name Time Method Ratio of mitral E velocity to e' [E/e'] Prior to randomization and after 48 weeks of randomized study treatment. E/e', a measure of diastolic function, will be measured by transthoracic echocardiography.
Left atrial volume index Prior to randomization and after 48 weeks of randomized study treatment. Left atrial volume index will be measured by transthoracic echocardiogarphy using the biplane method and indexed for body surface area.
Rest Myocardial Blood Flow (MBF) Prior to randomization and after 48 weeks of randomized study treatment. Subjects will undergo 13N cardiac PET imaging at baseline and after 48 weeks of randomized study treatment. Myocardial blood flow (MBF) will be determined during the stress and rest conditions.
Early diastolic septal mitral annular velocity [septal e'] Prior to randomization and after 48 weeks of randomized study treatment. Septal e', a measure of diastolic function, will be measured by transthoracic echocardiography using tissue Doppler.
Peak tricuspid regurgitant velocity Prior to randomization and after 48 weeks of randomized study treatment. Peak tricuspid regurgitant jet velocity, a measure of diastolic function, will be measured by transthoracic echocardiography using continuous wave Doppler.
Stress Myocardial Blood Flow (MBF) Prior to randomization and after 48 weeks of randomized study treatment. Subjects will undergo 13N cardiac PET imaging at baseline and after 48 weeks of randomized study treatment. Myocardial blood flow (MBF) will be determined during the stress and rest conditions.
Left atrial reservoir strain Prior to randomization and after 48 weeks of randomized study treatment. Left atrial strain, a sensitive measure of end-diastolic pressure and atrial remodeling, will be quantified using TOMTEC.
Peak global longitudinal strain Prior to randomization and after 48 weeks of randomized study treatment. Left ventricular global longitudinal strain, a measure of subclinical cardiac dysfunction, will be quantified using TOMTEC.
Subendocardial-Specific Myocardial Flow Reserve (MFR) Prior to randomization and after 48 weeks of randomized study treatment. Subjects will undergo 13N cardiac PET imaging at baseline and after 48 weeks of randomized study treatment. Myocardial blood flow (MBF) will be determined during the stress and rest conditions. Subendocardial layer-specific MBF will be calculated using QPET software (Cedars-Sinai Medical Center, Los Angeles, CA). Myocardial flow reserve will be calculated as stress MBF divided by rest MBF.
Relative wall thickness Prior to randomization and after 48 weeks of randomized study treatment. Relative wall thickness is calculated as 2\*posterior wall thickness/LV end-diastolic diameter as measured by transthoracic echocardiography.
Trial Locations
- Locations (2)
Brigham and Women's Hospital
🇺🇸Boston, Massachusetts, United States
Massachusetts General Hospital
🇺🇸Boston, Massachusetts, United States
Brigham and Women's Hospital🇺🇸Boston, Massachusetts, United StatesEllen Seely, MDContact617-732-5666ESEELY@bwh.harvard.edu