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Mechanical enhancement and myocardial oxygen saving by synchronized dynamic left ventricular compression
O Kawaguchi1, Y Goto, S Futaki
1Department of Cardiovascular Dynamics, National Cardiovascular Center Research Institute, Osaka, Japan.
The Journal of Thoracic and Cardiovascular Surgery
|March 1, 1992
Summary
Dynamic cardiac compression enhances left ventricular function without increasing oxygen demand. This innovative method improves pump performance without compromising coronary blood flow or myocardial oxygen consumption.
Area of Science:
- Cardiology
- Biomedical Engineering
- Physiology
Background:
- Dynamic cardiomyoplasty uses skeletal muscle grafts to aid impaired heart function.
- Previous studies show improved patient status and hemodynamics with this technique.
- The impact of dynamic cardiac compression on left ventricular energetics remains unclear.
Purpose of the Study:
- To investigate the effects of dynamic cardiac compression on left ventricular energetics.
- To analyze changes in the pressure-volume relationship and myocardial oxygen consumption.
Main Methods:
- Utilized an isolated cross-circulated dog heart model.
- Applied a dynamic cardiac compression device during systole.
- Measured end-systolic pressure, contractility (Emax), pressure-volume area, external work, coronary blood flow, and oxygen consumption.
Main Results:
- Dynamic cardiac compression significantly increased Emax and external mechanical work.
- Coronary blood flow and myocardial oxygen consumption remained unchanged when stroke volume was constant.
- When external work was normalized, pressure-volume area and myocardial oxygen consumption decreased.
- Dynamic cardiac compression did not elevate myocardial oxygen consumption for increased external work.
Conclusions:
- Dynamic cardiac compression augments left ventricular pump function.
- This method improves cardiac performance without increasing myocardial oxygen demand.
- Coronary blood flow is not compromised by dynamic cardiac compression.