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Effects of a preload increase on ventricular filling in coronary artery disease
Z S Kyriakides1, D T Kremastinos, I A Paraskevaides
1Athens General Hospital, Athens University Medical School, Greece.
Insights
Leg elevation improved ventricular filling dynamics in coronary artery disease patients. Key measures of blood flow through the heart
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Coronary artery disease (CAD) impacts cardiac function.
- Understanding ventricular filling dynamics is crucial for managing CAD patients.
Purpose of the Study:
- To investigate the effects of increased preload on ventricular filling dynamics.
- To assess changes before and after passive leg elevation in CAD patients.
Main Methods:
- Echocardiography was used to measure mitral and tricuspid inflow velocities.
- Measurements were taken in 50 CAD patients before and after leg elevation.
- Key Doppler parameters including peak E and A velocities and E/A ratio were analyzed.
Main Results:
- Leg elevation significantly increased mitral and tricuspid peak E and A velocities and the mitral E/A ratio.
- Isovolumic relaxation time and mitral deceleration time decreased post-leg elevation.
- Increased tricuspid peak A velocity correlated with positive exercise stress test results (p=0.01).
- Increased mitral peak A velocity correlated with a history of myocardial infarction (p=0.006).
Conclusions:
- Passive leg elevation acutely enhances ventricular filling dynamics in patients with coronary artery disease.
- These hemodynamic changes may be influenced by underlying disease severity and exercise tolerance.
- Findings suggest a potential non-invasive method to assess cardiac response to preload changes in CAD.
Abstract:
This study was conducted to investigate the effects of a preload increase on ventricular filling dynamics in 50 coronary artery disease patients both before and immediately after leg elevation. Mitral and tricuspid peak E and A velocities and the mitral E/A velocity ratio increased after leg elevation whereas isovolumic relaxation time and mitral deceleration time decreased. The increase in tricuspid peak A velocity after leg elevation was related to the positivity of the exercise stress test (p = 0.01). The increase in mitral peak A velocity was related to the history of old myocardial infarction (p = 0.006).