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Changes in ventricular septal thickness during diuretic therapy
Insights
Hydrochlorothiazide therapy in hypertensive patients lowered blood pressure but did not alter overall left ventricular mass. Changes in septal thickness suggest adaptive cardiac muscle remodeling in response to diuretic-induced reductions in ventricular size.
Area of Science:
- Cardiology
- Nephrology
- Pharmacology
Background:
- Hypertension is a major risk factor for cardiovascular disease.
- Left ventricular hypertrophy (LVH) is a common complication of hypertension.
- Diuretics are a first-line treatment for hypertension.
Purpose of the Study:
- To investigate the effects of hydrochlorothiazide on left ventricular muscle mass in hypertensive patients.
- To assess changes in echocardiographic parameters of left ventricular structure during short-term diuretic therapy.
Main Methods:
- Echocardiography was used to measure left ventricular muscle mass and dimensions.
- Twenty hypertensive patients were included in the study.
- Patients received short-term therapy with hydrochlorothiazide.
Main Results:
- Blood pressure decreased significantly in the study group.
- Overall septal thickness and posterior wall thickness did not change.
- In some patients, decreased septal thickness correlated with decreased left ventricular cross-sectional area, while in others, increased septal thickness was associated with decreased transverse dimension.
Conclusions:
- Hydrochlorothiazide therapy effectively lowers blood pressure in hypertensive patients.
- Changes in left ventricular wall thickness during diuretic therapy may represent adaptive remodeling of cardiac muscle.
- These findings suggest that left ventricular muscle adjusts its structure in response to changes in ventricular dimensions induced by diuretics.
Abstract:
We report on changes in echocardiographic parameters of left ventricular muscle mass in 20 hypertensive patients during short-term therapy with hydrochlorothiazide. In the group as a whole, blood pressure fell, but septal thickness and posterior wall thickness did not change. Septal thickness decreased in nine patients, and in all of these patients calculated left ventricular cross-sectional area also decreased. Septal thickness did not change or increased in 11 patients and in only one of these patients did cross-sectional area increase. These increases in septal thickness usually were associated with decreases in left ventricular transverse dimension. We therefore conclude that the increases in left ventricular wall and septal thickness during diuretic therapy probably reflect an adaptive change of cardiac muscle tissue around a smaller left ventricle.