Does off-pump coronary artery bypass grafting really preserve renal function?

Area of Science:

• Cardiovascular Surgery
• Nephrology
• Anesthesiology

Background:

• Cardiopulmonary bypass (CPB) use during cardiac surgery is associated with impaired renal function and potential renal failure.
• Coronary artery bypass grafting (CABG) performed without CPB (off-pump CABG) may mitigate these adverse renal effects.

Purpose of the Study:

• To compare the impact of off-pump CABG (OPCAB) versus conventional CABG (on-pump) on perioperative renal function and early clinical outcomes.
• To evaluate the renoprotective potential of the OPCAB technique.

Main Methods:

• A prospective study comparing 52 patients undergoing OPCAB with 53 matched patients undergoing conventional CABG.
• Assessment of perioperative renal function, including creatinine levels and creatinine clearance.
• Evaluation of early clinical outcomes such as intubation duration, ICU stay, and creatine kinase-MB release.

Main Results:

• The OPCAB group exhibited a significantly smaller increase in creatinine levels (0.16 vs 0.45 mg/dl) and greater creatinine clearance (81.6 vs 56.3 ml/min) postoperatively (p=0.01).
• Patients in the OPCAB group showed quicker recovery of free water clearance.
• OPCAB was associated with shorter intubation and ICU stays, reduced creatine kinase-MB release, and lower blood transfusion requirements.

Conclusions:

• Off-pump CABG effectively preserves glomerular filtration rate and prevents postoperative increases in creatinine levels.
• The OPCAB technique offers superior renal protection and facilitates earlier patient recovery compared to conventional CABG.