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Systolic ventricular interaction in normal and diseased explanted human hearts
J P Slater1, E C Lipsitz, J M Chen
1Department of Surgery (Division of Cardiothoracic Surgery), Columbia University College of Physicians and Surgeons, New York, NY, USA.
The Journal of Thoracic and Cardiovascular Surgery
|June 1, 1997
Summary
In heart failure, the interaction between the right and left ventricles significantly increases, particularly the left ventricular-right ventricular interaction. This highlights the right ventricle's greater reliance on left ventricular function during dilated cardiomyopathy.
Area of Science:
- Cardiovascular Physiology
- Heart Failure Pathophysiology
- Ventricular Mechanics
Background:
- Ventricular-ventricular interaction is crucial for maintaining cardiac output.
- Dilated cardiomyopathy (DCM) alters cardiac mechanics and hemodynamics.
- Understanding inter-ventricular coupling is vital for managing heart failure.
Purpose of the Study:
- To quantify the interaction between the right and left ventricles in human hearts with dilated cardiomyopathy.
- To compare ventricular interaction in DCM hearts versus normal control hearts.
Main Methods:
- Human hearts from DCM transplant recipients and healthy donors were studied using an isolated perfusion circuit.
- Ventricular interaction was assessed by manipulating ventricular volumes and measuring pressure changes.
- Linear regression analysis determined the magnitude of left ventricular-right ventricular and right ventricular-left ventricular interaction.
Main Results:
- Left ventricular-right ventricular interaction was significantly higher in DCM hearts (0.22) compared to controls (0.06).
- Right ventricular-left ventricular interaction was also higher in DCM hearts (0.14) than controls (0.09), though not significantly.
- A marked increase in left ventricular-right ventricular interaction was observed in DCM.
Conclusions:
- The study confirms increased systolic ventricular interaction in dilated cardiomyopathy.
- Findings demonstrate a heightened dependence of the right ventricle on left ventricular function for systolic pressure generation in DCM.
- Results validate previous findings from animal models and emphasize altered ventricular coupling in human heart failure.