Multicenter study of general anesthesia. I. Design and patient demography

Area of Science:

• Anesthesiology
• Clinical Pharmacology
• Surgical Care

Background:

• Anesthetic agents are crucial for patient safety and surgical outcomes.
• Comparative studies are essential to determine the relative efficacy and safety of different anesthetics.
• Evaluating anesthetic agents in diverse patient populations and clinical settings is vital.

Purpose of the Study:

• To conduct a prospective randomized clinical trial comparing four anesthetic agents: enflurane, fentanyl, halothane, and isoflurane.
• To assess the efficacy and relative safety of these agents in a large patient cohort.
• To determine the validity of pooling data from multiple institutions for anesthetic research.

Main Methods:

• Prospective randomized clinical trial involving 17,201 patients across 15 university-affiliated hospitals.
• Patients were stratified into groups with and without preanesthetic medication.
• Randomization to one of four study agents: enflurane, fentanyl, halothane, or isoflurane.
• Data collection included preoperative assessment, intraoperative monitoring, immediate recovery, and up to 7 days post-anesthesia.

Main Results:

• The study included a diverse patient population (mean age 43 yr, 65% female, 90.7% ASA Physical Status 1 or 2).
• Data were collected systematically across multiple time points and institutions.
• The pooled data analysis was deemed valid for comparing the anesthetic agents.

Conclusions:

• Pooling data from multiple institutions in this trial was valid.
• The study successfully allowed for the determination of the efficacy and relative safety of enflurane, fentanyl, halothane, and isoflurane.
• This research provides a robust comparison of commonly used anesthetic agents.