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Continuous warm versus intermittent cold blood cardioplegia for coronary bypass surgery in patients with left
Insights
Continuous warm blood cardioplegia offers comparable myocardial protection to intermittent cold cardioplegia during coronary artery surgery for patients with left ventricular dysfunction.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Myocardial Protection
Background:
- Moderate to severe left ventricular dysfunction presents challenges in cardiac surgery.
- Myocardial protection strategies are crucial for patient outcomes.
Purpose of the Study:
- To compare the efficacy of continuous warm blood cardioplegia versus intermittent cold blood cardioplegia.
- To evaluate myocardial protection in patients undergoing isolated coronary artery surgery.
Main Methods:
- Prospective randomized trial involving 108 patients with left ventricular dysfunction.
- Comparison of intermittent cold blood cardioplegia (Group 1) and continuous warm blood cardioplegia (Group 2).
- Assessment of clinical outcomes including mortality, myocardial infarction, and neurological deficit.
Main Results:
- No significant differences in operative mortality, perioperative myocardial infarction, or hospital stay between groups.
- Continuous warm cardioplegia required more potassium for diastolic arrest and resulted in higher post-cross-clamp serum potassium.
- Spontaneous return of sinus rhythm was significantly more frequent in the continuous warm cardioplegia group (91.2% vs 45.8%).
Conclusions:
- Retrograde continuous warm blood cardioplegia provides comparable myocardial protection to retrograde intermittent cold blood cardioplegia.
- Continuous warm cardioplegia may facilitate faster spontaneous rhythm restoration post-surgery.
- Both methods are effective for myocardial protection in selected surgical candidates.
Abstract:
Between October 1991 and March 1994, 108 consecutive patients with moderate to severe left ventricular dysfunction underwent non-emergency isolated coronary artery surgery under the care of one surgeon (A.R.). They were prospectively randomised to receiving either intermittent cold (Group 1-50 patients) or continuous warm (Group 2-58 patients) blood cardioplegia for myocardial protection. There were no significant differences in clinical outcome between the two groups, as judged by operative mortality, rates of perioperative myocardial infarction, the serum CKMB isoenzyme level at 2 and 18 h after operation, need for circulatory support, postoperative neurological deficit, or duration of hospital stay. Group 2 patients required significantly more potassium (68 vs 29 mmol, P < 0.001) to maintain diastolic arrest and also had higher serum potassium levels after removal of the cross-clamp (P < 0.001). However, sinus rhythm returned spontaneously with greater frequency (91.2% vs 45.8%, P < 0.001) in Group 2 patients. In conclusion this report suggests that retrograde continuous warm blood cardioplegia provides comparable myocardial protection to that achieved with retrograde intermittent cold blood cardioplegia in patients with moderate to severe left ventricular dysfunction undergoing isolated coronary artery surgery.