Related Experiment Videos
Long-term captopril therapy in congestive heart failure: serial hemodynamic and echocardiographic changes
Insights
Long-term captopril therapy improved congestive heart failure (CHF) patients, reducing blood pressure and ventricular wall stress. Radionuclide techniques proved more effective than echocardiography for monitoring vasodilator therapy in CHF.
Area of Science:
- Cardiology
- Pharmacology
- Medical Imaging
Background:
- Refractory congestive heart failure (CHF) presents significant management challenges.
- Optimizing vasodilator therapy requires accurate monitoring of hemodynamic changes.
Purpose of the Study:
- To evaluate the long-term effects of captopril therapy on systemic hemodynamics and echocardiographic parameters in CHF patients.
- To compare the efficacy of radionuclide techniques versus echocardiography in assessing functional circulatory changes during vasodilator treatment.
Main Methods:
- Serial radionuclide and M-mode echocardiographic assessments in ten CHF patients on long-term captopril.
- Measurement of systemic hemodynamic parameters including blood volume, blood pressure, and left ventricular wall stress.
Main Results:
- Captopril therapy led to significant clinical improvement, reduced blood pressure, and decreased peak systolic left ventricular wall stress.
- Radionuclide first-pass methods showed greater utility than M-mode echocardiography and radionuclide gated blood pool techniques for circulatory evaluation.
Conclusions:
- Long-term captopril therapy is effective in managing refractory CHF.
- Measuring peak systolic wall stress is crucial for CHF patient follow-up.
- Radionuclide first-pass techniques offer superior functional circulatory evaluation during vasodilator therapy.
Abstract:
Ten patients with refractory congestive heart failure (CHF) were followed serially for systemic hemodynamic (radionuclide techniques) and M-mode echocardiographic changes during long-term captopril therapy with optimum doses. After 1 week of maintenance captopril therapy, all patients were clinically improved. This was associated with a significant (p less than 0.05) reduction of total blood volume (-6 +/- 2% N), mean blood pressure (-9 +/- 3 mm Hg), and peak systolic left ventricular wall stress (-50 +/- 19 X 10(3) dynes/cm2). At the end of 2 months of maintained therapy, mean blood pressure reduction was -12 +/- 4 mm Hg (p less than 0.05); further hemodynamic improvement was manifested by a significant shortening of pulmonary mean transit time (-3.7 +2- 1.33 seconds, p less than 0.05). Echocardiographic data revealed an increase in end-diastolic septal wall thickness (+0.13 +/- 0.05, p less than 0.05) and left ventricular posterior wall thickness (+0.13 +/- 0.03, p less than 0.05), and further reduction in peak systolic stress (-84 +/- 23 X 10(3) dynes/cm2, p less than 0.05). The present study indicates the importance of measuring peak systolic wall stress in the follow-up of CHF patients. Moreover, we found that for functional circulatory evaluation during vasodilator therapy, the radionuclide first-pass methods were more helpful than both M-mode echocardiography and radionuclide gated blood pool techniques.