Fixed-rate alfentanil infusions for surgery of variable duration

Area of Science:

• Anesthesiology
• Pharmacology

Background:

• Continuous infusion of alfentanil is a method for maintaining anesthesia.
• Optimizing infusion protocols is crucial for patient recovery and satisfaction.

Purpose of the Study:

• To evaluate the efficacy and safety of a continuous alfentanil infusion protocol using a modified Fresenius-Injectomat pump for orthopedic surgery.
• To assess the recovery characteristics and patient satisfaction associated with this anesthetic technique.

Main Methods:

• A prospective study involving 27 orthopedic surgery patients.
• Anesthesia induced with thiopentone, vecuronium, and an alfentanil loading dose (10 mcg/kg/min for 10 min).
• Maintenance infusion of alfentanil (1 mcg/kg/min) with supplemental doses as needed, using a modified Fresenius-Injectomat pump.

Main Results:

• Mean anesthesia duration was 139.3 minutes.
• Rapid recovery observed: eye opening in 3.1 minutes and response to commands in 3.5 minutes post-anesthesia.
• One patient experienced ventilatory depression, successfully treated with naloxone; all patients were satisfied.

Conclusions:

• Continuous alfentanil infusion via a modified Fresenius-Injectomat pump is a viable and potentially simplifying method for orthopedic surgery.
• The protocol demonstrated effective anesthesia with rapid and satisfactory patient recovery.
• This approach may represent a significant step towards simplifying alfentanil administration in clinical practice.