Effects of cardiopulmonary bypass on the dynamics and coronary circulation of the normal heart
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Total normothermic cardiopulmonary bypass (CPB) showed no significant negative effects on cardiac function or myocardial blood flow in normal hearts. This study confirms the safety of CPB for cardiac performance in the short term.
Area of Science:
- Cardiovascular Surgery
- Cardiac Physiology
Background:
- Cardiopulmonary bypass (CPB) is essential for cardiac surgery.
- Potential adverse effects of CPB on myocardial function and blood flow require investigation.
- Isolating CPB effects from confounding factors like anesthesia and surgical stress is crucial.
Purpose of the Study:
- To assess the independent impact of normothermic cardiopulmonary bypass (CPB) on cardiac function.
- To evaluate the effects of CPB on myocardial blood flow and its regional distribution.
- To determine the short-term (3, 24, 48 hours) hemodynamic consequences of CPB in normal hearts.
Main Methods:
- Two groups of normal animals underwent identical experimental conditions.
- One group received two hours of total normothermic cardiopulmonary bypass (CPB).
- Myocardial blood flow and hemodynamic performance were assessed before, immediately after, and 3, 24, and 48 hours post-CPB.
Main Results:
- Coronary blood flow and distribution remained similar before and after CPB.
- A slight, but not statistically significant, inferiority in hemodynamic status was observed 3 hours post-CPB.
- Cardiovascular dynamics were comparable between CPB and control groups at 24 and 48 hours postoperatively.
Conclusions:
- Two hours of total normothermic cardiopulmonary bypass does not significantly impair the performance of a normal heart.
- CPB does not have a significant deleterious effect on coronary perfusion or its regional distribution.
- The beating empty heart demonstrates resilience following normothermic CPB.
Abstract:
This study observed the consequences of total normothermic cardiopulmonary bypass (CPB) on cardiac function, myocardial blood flow, and its regional distribution. To determine the potential effects of CPB per se on hemodynamic performance of the heart from the concomitant interfering influences of anesthesia, surgical procedure, and preexisting disease, myocardial function and blood flow were investigated in two groups of normal animals submitted to identical experimental conditions, except for two hours of total CPB, which was performed in only one group. Myocardial blood flow distribution was studied immediately before and after CPB, and the hemodynamic studies were performed 3, 24, and 48 hours postoperatively in the awake resting animal. Coronary blood flow and its distribution were similar before and after CPB. Three hours postoperatively, the hemodynamic status of the perfused dogs seemed to be slightly inferior compared with control subjects; however, there was no statistically significant difference between the two groups. Twenty-four and 48 hours after surgery, the cardiovascular dynamics were similar in both groups. These results demonstrate that two hours of total normothermic cardiopulmonary bypass have no significant deleterious effect on the performance, coronary perfusion, and its regional distribution, of the normal beating empty heart.