Residual postoperative paralysis. Pancuronium versus mivacurium, does it matter?

Area of Science:

• Anesthesiology
• Pharmacology
• Critical Care Medicine

Background:

• Postoperative residual paralysis (POP) is a frequent complication in postanesthesia care units (PACUs).
• Existing studies often lack detailed anesthetic management information.
• Comparative studies on long- and short-acting neuromuscular blockers are scarce.

Purpose of the Study:

• To reexamine the incidence of postoperative weakness after administering long- and short-acting neuromuscular blockers.
• To compare the recovery profiles of mivacurium and pancuronium.
• To evaluate the effectiveness of tactile train-of-four (TOF) monitoring in guiding neuromuscular blockade reversal.

Main Methods:

• Ninety-one adult patients were divided into three groups receiving mivacurium or pancuronium.
• Anesthesia was induced and maintained using various agents including propofol, fentanyl, desflurane, and nitrous oxide.
• Neuromuscular blockade was monitored using tactile TOF stimulation, with reversal agents administered based on twitch response.

Main Results:

• All patients receiving mivacurium achieved TOF ratios greater than 0.80 in the PACU, with many reaching 0.90 in the operating room.
• Patients receiving pancuronium showed slower recovery, with some not reaching a TOF ratio of 0.90 within 90 minutes of reversal.
• Recovery parameters did not differ between pancuronium-desflurane and pancuronium-propofol anesthesia groups.

Conclusions:

• Tactile TOF monitoring can minimize postoperative weakness in the PACU, even with long-acting neuromuscular blockers.
• Full recovery (TOF ratio ≥ 0.90) is more consistently achieved with short-acting agents like mivacurium.
• Nondepolarizing neuromuscular blockers require careful monitoring for safe patient recovery.