Related Experiment Videos
Impact of preoperative renal dysfunction on cardiac surgery results
Dan Abramov1, Miguel Tamariz, Stephen Fremes
1Department of Cardiovascular Surgery, Sunnybrook Health Science Center, University of Toronto, Toronto, Canada. abramov2@zahav.net.il
Insights
Preoperative renal dysfunction significantly increases cardiac surgery risks. Lower creatinine clearance levels exponentially raise morbidity and mortality, persisting long-term post-surgery.
Area of Science:
- Nephrology
- Cardiology
- Surgical Outcomes
Background:
- Cardiac surgery patients often present with comorbidities.
- Preoperative renal dysfunction is a known risk factor for adverse outcomes.
- Quantifying the precise impact of renal dysfunction on cardiac surgery outcomes is crucial.
Purpose of the Study:
- To analyze the association between preoperative renal function and outcomes following cardiac surgery.
- To identify specific thresholds of renal dysfunction that predict increased morbidity and mortality.
- To evaluate the long-term impact of preoperative renal dysfunction on patient survival.
Main Methods:
- Analysis of a cardiac surgery database including 2,214 patients.
- Inclusion of plasma creatinine levels and calculation of creatinine clearance.
- Application of logistic regression and propensity score analyses for risk stratification.
Main Results:
- Preoperative renal dysfunction (creatinine clearance < 0.9 mL x s(-1) x m(-2)) independently predicted morbidity and mortality.
- An exponential increase in adverse outcomes was observed when creatinine clearance fell below 0.84 mL x s(-1) x m(-2).
- Elevated creatinine levels persisted for 6 months postoperatively, with significantly reduced 18-month survival in affected patients.
Conclusions:
- Preoperative renal dysfunction is a critical independent predictor of poor outcomes in cardiac surgery.
- Specific thresholds of reduced creatinine clearance portend a significantly higher risk of morbidity, mortality, and reduced survival.
- Early identification and management of renal dysfunction are vital for improving cardiac surgery patient outcomes.
Abstract:
Results of cardiac surgery were analyzed using a database that included plasma creatinine levels in 2,214 patients, of whom 507 had preoperative renal dysfunction (creatinine clearance < 0.9 mL x s(-1) x m(-2)). Logistic regression and propensity score analyses found preoperative renal dysfunction to be an independent predictor of morbidity and mortality. Plotting preoperative creatinine clearance against morbidity and mortality revealed an exponential increase in morbidity and mortality when preoperative creatinine clearance was < 0.84 mL x s(-1) x m(-2). Patients were stratified for age, operative procedure, and comorbidity. In all stratified groups, preoperative creatinine clearance < 0.84 mL x s(-1) x m(-2) was associated with similar exponential increases in morbidity and mortality. In patients with preoperative renal dysfunction, elevated plasma creatinine levels persevered for 6 months postoperatively. Dialysis beyond postoperative day 10 was required in < 2% of patients with preoperative plasma creatinine of 160-200 micro mol x L(-1) and in 5% in those with creatinine > 200 micro mol x L(-1) (p < 0.05). Actuarial survival was significantly reduced (< 90% at 18 months postoperatively) in patients with preoperative renal dysfunction.