Survival and reoperation
Results were available for up to 5 years follow up for survival analysis (total follow up time = 164 patient years). Mean follow up time was 2.9±3.9 years. Kaplan Meier analysis (Figure 1) showed similar survival between the two surgical cohorts: PAR 59% survival (95% CI 26–80%), CVG 69% survival (95% CI 37–82%), Logrank test p=0.158.
The Cox proportional hazards model analysis found the Euroscore and pre-operative haemodynamic instability function to be predictors of worse survival (Hazard Ratio (HR) 1.03, 95% CI 1.01–1.07, p=0.046) and (HR 3.74, 95% CI 1.19–11.80, p=0.024). After controlling for age, sex, history of renal failure, the influence of PAR on survival compared to CVG remained to be non-inferior (HR 1.05, 95% CI 0.39–2.81, p=0.920) (Table 5).