Multicenter study of general anesthesia. II. Results

Area of Science:

• Anesthesiology
• Clinical Pharmacology
• Patient Safety

Background:

• General anesthesia involves risks and potential adverse events.
• Comparing the safety and efficacy of different anesthetic agents is crucial for clinical decision-making.
• Previous studies have suggested varying risk profiles for common anesthetic agents.

Purpose of the Study:

• To prospectively evaluate the safety and efficacy of four general anesthetic agents: enflurane, fentanyl, halothane, and isoflurane.
• To identify and compare specific adverse outcomes associated with each anesthetic agent.
• To assess the impact of these agents on patient recovery and pain management.

Main Methods:

• Prospective, stratified, randomized clinical trial involving 17,201 patients.
• Patients were monitored before, during, and up to 7 days after anesthesia.
• Adverse outcomes, including mortality, myocardial infarction, stroke, arrhythmias, and recovery parameters, were recorded and analyzed.

Main Results:

• Overall mortality was low (0.11%), with anesthesia potentially contributing in 0.04% of deaths.
• No significant differences were found in rates of death, myocardial infarction, or stroke among the agents.
• Significant differences in adverse events included higher rates of severe ventricular arrhythmia with halothane, severe hypertension and bronchospasm with fentanyl, and severe tachycardia with isoflurane.
• Recovery was slowest with halothane, while fentanyl use was associated with less pain in the recovery room.

Conclusions:

• Clinically significant differences exist among enflurane, fentanyl, halothane, and isoflurane regarding specific adverse outcomes and recovery.
• Halothane was associated with slower recovery and more ventricular arrhythmias.
• Fentanyl was linked to less pain but more hypertension and bronchospasm, while isoflurane showed higher rates of tachycardia.