Computer control versus manual control of systemic hypertension during cardiac surgery

Area of Science:

• Anesthesiology and Critical Care Medicine
• Biomedical Engineering
• Cardiovascular Surgery

Background:

• Previous research established the feasibility of computer-controlled vasoactive drug infusion for hypertension during cardiac surgery.
• This study aimed to compare computer-controlled versus manual blood pressure management for hemodynamic stability.

Purpose of the Study:

• To evaluate the impact of computer-controlled blood pressure on hemodynamic stability during cardiac surgery.
• To compare computer-controlled management with conventional manual control by anesthesiologists.

Main Methods:

• A comparative study involving 160 patients undergoing cardiac surgery, divided into computer-controlled (80 patients) and manual control (80 patients) groups.
• Vasoactive drugs, including sodium nitroprusside and nitroglycerin, were administered.
• Hemodynamic stability was assessed using the standard deviation of mean arterial pressure and the percentage of time spent in hypertensive or hypotensive states.

Main Results:

• The computer-controlled group exhibited a smaller standard deviation of mean arterial pressure (7.5±2.2 mmHg) compared to the manual group (8.9±2.3 mmHg; P<0.0001).
• Computer control resulted in significantly less time with hypertensive (9.4±5.7% vs. 13.1±6.0%; P<0.0001) and hypotensive (8.0±5.9% vs. 11.8±7.4%; P<0.0001) pressures.

Conclusions:

• Computer-controlled management of blood pressure significantly enhances hemodynamic stability during cardiac surgery.
• This automated approach offers a superior alternative to manual control for maintaining stable blood pressure in surgical patients.