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Coronary hemodynamics in hypertensive heart disease: basic concepts and clinical consequences
Journal of Cardiovascular Pharmacology
|January 1, 1985
Summary
Nonhypertensive left ventricular hypertrophy preserves coronary reserve (CR). However, hypertensive hypertrophy and ventricular dilatation significantly reduce CR, indicating distinct impacts on coronary hemodynamics.
Area of Science:
- Cardiology
- Physiology
- Medical Diagnostics
Background:
- Myocardial hypertrophy can affect coronary hemodynamics.
- Left ventricular (LV) hypertrophy is associated with various cardiac conditions.
Purpose of the Study:
- To determine coronary blood flow (CBF) and coronary reserve (CR) in patients with different types of LV hypertrophy.
- To investigate the influence of hypertensive vs. nonhypertensive hypertrophy and ventricular dilatation on CR.
Main Methods:
- Coronary blood flow (CBF) was measured using the gas chromatic argon technique.
- Coronary reserve (CR) was calculated by assessing coronary resistance before and after dipyridamole administration.
- Patients included those with hypertrophic obstructive cardiomyopathy, hypertensive heart disease, aortic stenosis, and aortic incompetence, along with controls.
Main Results:
- Normal CR was observed in nonhypertensive hypertrophy (HOC) despite increased LV mass.
- Hypertensive hypertrophy showed a significant reduction in CR (p < 0.001).
- Dilated hypertensive hearts and aortic incompetence also exhibited decreased CR.
Conclusions:
- Nonhypertensive LV hypertrophy maintains normal CR, irrespective of LV mass.
- Hypertensive hypertrophy leads to a specific reduction in CR.
- Ventricular dilatation independently deteriorates CR due to abnormal coronary vascular resistance.