Control of Postoperative Hypotension Using a Closed-Loop System for Norepinephrine Infusion in Patients After Cardiac...

Area of Science:

• Critical Care Medicine
• Anesthesiology
• Cardiovascular Surgery

Background:

• Vasodilatory hypotension management relies on vasopressors.
• Current vasopressor infusions require manual adjustments to meet pressure targets.
• A novel closed-loop vasopressor (CLV) system aims for more efficient hypotension correction.

Purpose of the Study:

• To test if a CLV system reduces hypotension in post-cardiac surgery patients.
• To compare CLV system management with standard manual management.

Main Methods:

• 40 post-cardiac surgery ICU patients were randomized into CLV and control groups for 2 hours.
• Norepinephrine infusion was managed by CLV or manually by nurses to maintain mean arterial pressure (MAP) between 65-75 mm Hg.
• Fluid administration was standardized; hypotension was defined as MAP <65 mm Hg.

Main Results:

• The CLV group experienced significantly less time with hypotension (1.4% vs 12.5%, P < .001).
• The CLV group had more time with MAP in the target range (95% vs 66%, P < .001).
• Norepinephrine infusion rate adjustments were significantly higher in the CLV group (581 vs 13, P < .001).

Conclusions:

• Closed-loop control of norepinephrine infusion effectively reduces postoperative hypotension.
• CLV systems offer a promising alternative to manual vasopressor management in ICU settings.
• No adverse events were reported in either group during the study.