Bispectral index-monitored anesthesia technique for transsternal thymectomy

Area of Science:

• Anesthesiology
• Neuroscience

Background:

• Myasthenia gravis presents unique anesthetic challenges, particularly during thymectomy.
• Neuromuscular blocking agents are often avoided in these patients, necessitating alternative anesthetic management strategies.

Purpose of the Study:

• To assess the utility of bispectral index (BIS) monitoring as an adjunct to balanced anesthesia.
• To evaluate BIS monitoring's role in facilitating tracheal extubation without neuromuscular blockade during transsternal thymectomy.

Main Methods:

• A prospective observational study involving 10 myasthenia gravis patients undergoing transsternal thymectomy.
• General anesthesia induced with fentanyl, propofol, and sevoflurane; tracheal intubation without neuromuscular blocking agents.
• Anesthetic depth titrated using BIS values (aiming for high 30s to low 40s) and physiological parameters.

Main Results:

• BIS monitoring facilitated excellent hemodynamic control throughout the surgical procedure.
• Anesthetic agents (propofol, remifentanil, sevoflurane) were discontinued based on surgical milestones and BIS levels.
• Early and problem-free tracheal extubation was achieved, with BIS levels above 90 upon extubation.

Conclusions:

• Bispectral index monitoring is a valuable adjunct for balanced anesthesia in myasthenia gravis patients undergoing thymectomy.
• This approach allows for precise anesthetic titration, hemodynamic stability, and expedited tracheal extubation without neuromuscular blockade.