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Warm blood cardioplegic induction: an underused modality
H M Hanafy1, B S Allen, J W Winkelmann
1Division of Cardiothoracic Surgery, University of Illinois, Chicago 60612.
The Annals of Thoracic Surgery
|December 1, 1994
Summary
Warm blood cardioplegic induction (WBCI) benefits non-shocked hearts by repaying energy debt, especially in patients with severe heart disease or urgent needs. This metabolic support aids myocardial recovery during cardiac surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiothoracic Anesthesia
Background:
- Warm blood cardioplegic induction (WBCI) is known to improve recovery in cardiogenic shock hearts.
- The energy status of non-shocked hearts before cardioplegic arrest is less understood.
Purpose of the Study:
- To investigate whether non-shocked hearts are energy depleted and would benefit from WBCI.
- To assess myocardial oxygen consumption and glucose uptake during WBCI in non-shocked patients.
Main Methods:
- Twenty-five non-shocked patients undergoing open heart surgery received antegrade WBCI.
- Simultaneous blood samples from the aortic root and coronary sinus were analyzed post-arrest.
- Measurements included oxygen consumption, oxygen extraction ratio, and glucose uptake across the left ventricle.
Main Results:
- A positive linear correlation was observed between myocardial oxygen and glucose uptake (p < 0.001).
- Severe multivessel disease and high Parsonnet scores predicted increased metabolic uptake during WBCI.
- Patients with urgent conditions, hypertension history, or left ventricular overload showed higher metabolic demands.
Conclusions:
- WBCI in non-shocked hearts leads to increased metabolic uptake, indicating energy repayment.
- The benefit of WBCI is particularly pronounced in patients with severe underlying myocardial disease, hypertension, or left ventricular overload.
- WBCI may be beneficial even in elective cases with severe multivessel disease or high Parsonnet scores.