Assesment Of Gender Based Variation In Perfusion Parameters During Cardiopulmonary Bypass Surgery

Abstract

Background: Cardiovascular disease remains the leading cause of mortality worldwide, accounting for approximately 18-20 million deaths annually. Cardiopulmonary bypass (CPB), while indispensable in modern cardiac surgery, is inherently non-physiological and triggers complex systemic inflammatory responses and coagulation alterations. Emerging evidence suggests that sex-based physiological differences may influence perfusion adequacy and postoperative outcomes, yet most perfusion protocols remain standardized without gender-specific considerations.

Objective: This study aimed to evaluate gender-based differences in perfusion parameters and their relationship with postoperative outcomes in adult patients undergoing cardiac surgery with cardiopulmonary bypass.

Methodology: A prospective observational study was conducted that analyzed 70 adult cardiac surgery patients (38 males, 54.3%; 32 females, 45.7%) undergoing CPB. Comprehensive demographics, preoperative, intraoperative, and postoperative data were systematically collected from hospital medical records. Perfusion parameters including pump flow rates, mean arterial pressure, haematocrit levels, and oxygen delivery were analyzed by gender. Statistical analysis was performed using appropriate descriptive and inferential statistical tests.

Results: Female patients presented with significantly lower baseline hemoglobin (11.80 vs 13.98 g/dL, p<0.0001) and hematocrit (38.29% vs 41.29%, p=0.008). During CPB, females experienced more profound hemodilution (23.00% vs 25.58%, p=0.0002), lower pump flows (2.25 vs 2.67 L/min/m², p<0.0001), and reduced perfusion pressures (64.72 vs 72.31 mmHg, p=0.008). Female patients demonstrated trends toward increased postoperative complications (50.0% vs 28.9%, p=0.089) and bleeding events (34.4% vs 18.4%, p=0.126).

Conclusion: Gender-based physiological differences substantially influence perfusion dynamics during CPB. Individualized, gender-conscious perfusion management strategies are warranted to optimize intraoperative oxygen delivery and reduce postoperative complications in female cardiac surgery patients.