Slow rewarming improves jugular venous oxygen saturation during rewarming

Area of Science:

• Cardiovascular Surgery
• Neuroanesthesia
• Critical Care Medicine

Background:

• Postoperative cognitive dysfunction (POCD) after coronary artery bypass graft (CABG) surgery is a significant concern.
• Reduced internal jugular venous oxygen saturation (SjvO2) during rewarming is a potential contributor to POCD.
• The precise etiology of POCD remains under investigation.

Purpose of the Study:

• To investigate the impact of different rewarming rates on SjvO2 during the rewarming phase of CABG surgery.
• To determine if a slower rewarming strategy can mitigate decreases in cerebral oxygenation.

Main Methods:

• One hundred patients undergoing elective CABG were randomized into a control group (rapid rewarming) and a slow rewarming group.
• Internal jugular venous oxygen saturation (SjvO2) was continuously monitored using fiberoptic oximetry.
• Hemodynamic data and blood gas analyses were collected at multiple time points.

Main Results:

• Cerebral desaturation (SjvO2 < 50%) was less frequent in the slow rewarming group compared to the control group.
• The duration and proportion of cerebral desaturation time were significantly lower in the slow rewarming group (P < 0.05).
• No significant differences in cognitive function, assessed by mini-mental state examination, were observed between groups at baseline or one month post-surgery.

Conclusions:

• Employing a slow rewarming rate can effectively reduce the incidence of decreased SjvO2 during the rewarming period in CABG patients.
• This finding suggests a potential strategy to mitigate intraoperative cerebral desaturation.