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[Effect of diuretic agents on central and intracardiac hemodynamics in hypertension]
Insights
Diuretic treatment for essential hypertension reduced left ventricular volumes and circulating blood/plasma volumes. Some patients experienced reduced blood pressure without changes in cardiac output.
Area of Science:
- Cardiology
- Nephrology
- Pharmacology
Context:
- Essential hypertension is a common cardiovascular condition.
- Diuretics are a cornerstone of hypertension management.
- Understanding hemodynamic changes during diuretic therapy is crucial.
Purpose:
- To investigate the effects of diuretics on central and intracardiac hemodynamics in patients with essential hypertension.
- To compare hemodynamic responses to furosemide and hypothiazide treatments.
Summary:
- Echocardiography and dye dilution assessed hemodynamics in 28 men with hypertension during diuretic treatment (furosemide and hypothiazide).
- Both treatments decreased left ventricular end-systolic, end-diastolic, and stroke volumes.
- Circulating blood and plasma volumes significantly decreased with treatment.
- Patients with a hypotensive effect did not show diminished cardiac output, while those without showed no significant blood pressure decrease but increased heart rate.
Impact:
- Provides insights into the hemodynamic mechanisms of diuretic action in hypertension.
- Highlights differential responses to diuretics based on hypotensive effect.
- Informs clinical practice regarding diuretic use and patient monitoring.
Abstract:
Echocardiography and the method of dye dilution (Evans blue) were used to study parameters of the central and intracardiac haemodynamics in 28 men with uncomplicated essential hypertension during treatment with diuretics. Tests were undertaken thrice: after a 5-6 day control period, after a 3-day furosemide load (120 mg per 24 hrs), after 2-3 weeks course of treatment with hypothiazide (50-100 mg per 24 hrs). As a result there was a decrease of end-systolic, end-diastolic and stroke volumes of the left ventricle. In patients with hypotensive effect minute volume did not diminish. In the group without effect there was no significant decrease of arterial pressure, minute volume and general peripheral resistance but an increase in the heart rate. The initial volumes of the circulating blood and plasma in both groups were indistinguishable and decreased significantly as a result of treatment.