Heart Rate Variability after Off-Pump versus On-Pump Coronary Artery Bypass Graft Surgery

Area of Science:

• Cardiology
• Cardiac Surgery
• Physiology

Background:

• Coronary artery bypass graft (CABG) surgery is known to decrease heart rate variability (HRV).
• Limited data exists on the specific impact of off-pump CABG on postoperative HRV compared to on-pump procedures.
• Understanding these differences is crucial for patient recovery assessment.

Purpose of the Study:

• To compare postoperative heart rate variability (HRV) in patients undergoing off-pump versus on-pump CABG.
• To analyze the impact of surgical technique on HRV recovery following CABG.

Main Methods:

• A study involving 206 consecutive patients who underwent CABG.
• Patients were divided into off-pump (66) and on-pump (140) groups.
• Heart rate variability (HRV) was assessed using 24-hour Holter electrocardiogram recordings.

Main Results:

• No statistically significant differences were observed in key HRV parameters between the off-pump and on-pump CABG groups.
• Specific HRV metrics, including Mean RR interval, standard deviation of normal R-R intervals, and total power, were comparable.
• These findings indicate similar HRV recovery trajectories regardless of the CABG technique used.

Conclusions:

• Postoperative heart rate variability (HRV) shows no significant difference between patients who underwent off-pump versus on-pump CABG.
• The findings suggest that the choice between off-pump and on-pump CABG does not impact HRV recovery a few months post-surgery.
• This study contributes to the understanding of long-term physiological recovery after different CABG methods.