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Does off-pump coronary artery bypass grafting really preserve renal function?
Nobuhiko Hayashida1, Hideki Teshima, Shingo Chihara
1Department of Surgery, Kurume University, Japan. nobuhiko@med.kurume-u.ac.jp
Insights
Off-pump coronary artery bypass grafting (CABG) better preserves kidney function compared to conventional CABG. This technique reduces creatinine levels and improves creatinine clearance, leading to faster patient recovery and superior renal protection.
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.
Abstract:
It is well known that the use of cardiopulmonary bypass (CPB) influences renal function and occasionally results in renal failure following cardiac surgery. Coronary artery bypass grafting (CABG) without CPB may avoid this and preserve the perioperative renal function. The present study enrolled 52 patients undergoing CABG without CPB (OPCAB group) and matched them for renal function and prognostic variables with 53 patients undergoing conventional CABG (CABG group). Perioperative renal function and early clinical results were assessed. The OPCAB group had significantly less increase in creatinine levels (0.16 +/- 0.05 vs 0.45 +/- 0.06 mg/dl; p = 0.01) and greater creatinine clearance (81.6 +/- 7.3 vs 56.3 +/- 4.8ml/min; p = 0.01) postoperatively. Postoperative recovery of free water clearance was more prompt in the OPCAB group. The duration of intubation and intensive care unit stay was significantly shorter, and the creatine kinase-MB release and blood transfusion requirements were significantly less in the OPCAB group. The OPCAB technique preserved glomerular filtration rate and prevented the increase in creatinine levels. The results suggest that the technique enables earlier patient recovery and gives superior renal protection compared with conventional CABG.