Retrograde versus antegrade cardioplegia: impact on right ventricular function

Area of Science:

• Cardiovascular Surgery
• Cardiac Anesthesia
• Myocardial Protection

Background:

• Retrograde cardioplegia offers advantages over antegrade methods.
• Concerns exist regarding adequate right ventricular protection with retrograde cardioplegia.

Purpose of the Study:

• To prospectively compare right ventricular performance between retrograde and antegrade cardioplegia.
• To evaluate myocardial protection in patients undergoing myocardial revascularization.

Main Methods:

• Prospective study comparing retrograde (n=16) and antegrade (n=14) crystalloid cardioplegia.
• Utilized a right ventricular rapid-response thermistor catheter for hemodynamic measurements.
• Measured right ventricular ejection fraction, end-diastolic volume index, and stroke volume index pre- and post-bypass.

Main Results:

• No significant differences in cross-clamp time, heart rate, enzymes, inotropes, or arrhythmias.
• At 30 minutes post-bypass, retrograde cardioplegia showed a lower right ventricular end-diastolic volume index and higher stroke volume index (p<0.05).
• Both groups exhibited increased right ventricular end-diastolic volume index post-bypass compared to baseline.

Conclusions:

• Retrograde cardioplegia may provide better early right ventricular function post-myocardial revascularization.
• The findings challenge previous assumptions about inadequate right ventricular protection with retrograde delivery.
• Further research may explore long-term implications and optimal delivery strategies.