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Influence of acute right ventricular dysfunction on cardiac tamponade.
1University of Cincinnati Medical Center, Division of Cardiology, Ohio 45267-0542.
Journal of the American College of Cardiology
|December 1, 1991
Summary
Right ventricular dysfunction impairs echocardiographic detection of cardiac tamponade, making diagnosis less sensitive and later in progression. Pulsus paradoxus remains unaffected by coexisting right ventricular dysfunction during cardiac tamponade.
Area of Science:
- Cardiology
- Physiology
- Echocardiography
Background:
- Cardiac tamponade is a critical condition where fluid accumulation in the pericardium compresses the heart.
- Right ventricular dysfunction can alter cardiac mechanics and hemodynamic responses.
- Echocardiography is a key tool for diagnosing cardiac tamponade.
Purpose of the Study:
- To investigate the impact of acute ischemic right ventricular dysfunction on the echocardiographic and hemodynamic manifestations of cardiac tamponade.
- To determine if right ventricular dysfunction affects the sensitivity and timing of cardiac tamponade diagnosis using echocardiography.
- To assess the influence of right ventricular dysfunction on pulsus paradoxus in cardiac tamponade.
Main Methods:
- Echocardiographic and hemodynamic parameters were measured in nine dogs with induced cardiac tamponade.
- Right ventricular dysfunction was created using intracoronary microsphere injection.
- Measurements were taken before and after inducing right ventricular dysfunction across graded levels of pericardial pressure.
Main Results:
- Right ventricular dysfunction significantly increased right atrial and ventricular pressures and dimensions.
- Greater pericardial effusion and pressure were required to induce right atrial and ventricular collapse after right ventricular dysfunction.
- Echocardiographic signs of tamponade became less sensitive and occurred later with coexisting right ventricular dysfunction.
- Pulsus paradoxus was not abolished by the presence of ischemic right ventricular dysfunction.
Conclusions:
- Ischemic right ventricular dysfunction diminishes the sensitivity of echocardiographic detection of cardiac tamponade.
- Echocardiographic signs of cardiac tamponade appear later in the hemodynamic progression when right ventricular dysfunction is present.
- Pulsus paradoxus remains a consistent finding in cardiac tamponade, even with concurrent right ventricular dysfunction.