[Rapid sequence muscular relaxation: vecuronium versus succinylcholine]

Area of Science:

• Anesthesiology
• Pharmacology

Background:

• Endotracheal intubation requires adequate muscle relaxation.
• Vecuronium is a commonly used non-depolarizing neuromuscular blocking agent.

Purpose of the Study:

• To compare the onset times and conditions of endotracheal intubation using different vecuronium relaxation techniques.
• To evaluate the efficacy of the "priming" technique versus high-dose and succinylcholine methods.

Main Methods:

• 340 ASA I/II patients were randomly assigned to four groups: "priming" (10 mcg/kg + 100 mcg/kg at 4 min), "high dose" (250 mcg/kg), "control" (100 mcg/kg), and "succinylcholine" (1 mg/kg).
• Electromyographic monitoring of hypothenar muscles was used to assess neuromuscular blockade.
• Intubation scoring was employed to evaluate intubation conditions.

Main Results:

• The "priming" group showed no impairment in neuromuscular response during the 4-minute pre-relaxation period.
• Maximum muscle blockade was achieved significantly faster in the "priming" group (97s) compared to the "control" (314s) and "high dose" (174s) groups.
• Optimum intubation conditions were achieved when muscle responses were nearly abolished, with the "priming" technique demonstrating rapid onset.

Conclusions:

• The "priming" technique with vecuronium provides rapid and effective muscle relaxation for endotracheal intubation.
• This technique offers an alternative to higher doses of vecuronium or succinylcholine, potentially improving patient safety and anesthetic management.