Related Experiment Videos
[Left ventricular relaxation and hypertension. Effect of captopril on gamma-angiographic parameters]
J P Ollivier1, J F Gaillard, O Provendier
1Service de cardiologie, Hôpital du Val-de-Grâce, Paris.
Insights
Captopril treatment improved left ventricular filling rate in hypertensive patients, indicating a significant hemodynamic effect. This suggests captopril positively impacts cardiac function beyond blood pressure reduction.
Area of Science:
- Cardiology
- Pharmacology
- Medical Imaging
Context:
- Hypertension is associated with impaired left ventricular filling.
- Assessing the impact of antihypertensive drugs on cardiac mechanics is crucial.
- Left ventricular filling dynamics can be evaluated using radionuclide angiography.
Purpose:
- To investigate the effect of captopril on left ventricular filling in hypertensive patients.
- To determine if captopril influences maximum filling rate (MFR) and maximum filling time (MFT).
- To assess the hemodynamic significance of captopril's action on cardiac filling.
Summary:
- Captopril treatment significantly lowered blood pressure and reduced left ventricular mass in 14 hypertensive patients.
- Maximum filling rate (MFR) of the left ventricle was significantly accelerated post-captopril treatment (p=0.005).
- The observed improvement in MFR suggests a direct, hemodynamically significant action of captopril on left ventricular filling.
Impact:
- Captopril demonstrates a beneficial effect on left ventricular diastolic function in hypertension.
- Findings suggest captopril may improve cardiac mechanics beyond its antihypertensive effects.
- This study provides evidence for captopril's role in managing hypertensive heart disease.
Abstract:
In order to evaluate the action of captopril on left ventricular filling in hypertension, 14 hypertension (158 +/- 10/101 +/- 5 mmHg) patients aged 51 +/- 6 years were investigated by Technetium 99m gamma-angiography. The time/activity curve was used to determine the maximum filling rate (MFR) and maximum filling time (MFT) of the ventricle before and after treatment with captopril (mean dose : 44 +/- 26 mg/day for 7 months). Blood pressure was significantly lowered by treatment and there was a decrease in left ventricular mass from 128 +/- 17 to 118 +/- 15 g/m2 (p = 0.07). Maximum filling rate was accelerated by treatment from 2.27 +/- 0.57 to 2.57 +/- 0.43 VTD . s-1, p = 0.005). This variation was due essentially to half of the patients, suggesting an "all or nothing" type response. Maximum filling time did not vary. The basic question raised by this type of study is to know whether the improvement in the available relaxation parameter, MFR, was associated with actual improvement in filling, which is the true aim. Although the explanations offered for the observed findings are hypothetical, taking into account of all the trial data together with the morphological data provided by echocardiography suggests that captopril does have an actual and hemodynamically significant action on filling.