Laparoscopic surgery and muscle relaxants: is deep block helpful?

Area of Science:

• Anesthesiology
• Surgical Innovation
• Pharmacology

Background:

• Deep neuromuscular block (NMB) is proposed to enhance laparoscopic surgery by enabling lower inflation pressures, optimizing surgical space, and improving patient safety.
• This hypothesis suggests that a posttetanic count (PTC) of 1 or more, with a train-of-four (TOF) count of zero, offers advantages over moderate block (TOF counts of 1-3).

Purpose of the Study:

• To evaluate the evidence supporting the hypothesis that deep neuromuscular block improves surgical operating conditions and patient outcomes during laparoscopic surgery.
• To identify well-designed studies investigating the comparative efficacy of deep versus moderate neuromuscular block in this context.

Main Methods:

• A comprehensive literature search was conducted across six medical databases using multiple search strategies.
• Reference lists of retrieved articles and other relevant publications were also examined.
• The quality and limitations of existing studies on neuromuscular block in laparoscopic surgery were critically assessed.

Main Results:

• Evidence suggests low inflation pressures may reduce postoperative pain, but details on anesthetic protocols and NMB management are often lacking.
• No significant differences in surgical morbidity, conversion rates, hemodynamics, hospital stay, or patient satisfaction were found between low and standard pressure pneumoperitoneum.
• Well-designed studies directly comparing deep versus moderate NMB for surgical operating conditions are virtually nonexistent, and existing studies have significant protocol flaws.
• Abdominal compliance does not appear to be significantly increased by deep NMB compared to moderate block.
• Maintaining deep NMB poses challenges for reversal without sugammadex, and its use has economic implications due to required higher doses (≥4.0 mg/kg).

Conclusions:

• There is a lack of objective data to support the proposition that deep neuromuscular block offers superior patient outcomes or improved surgical operating conditions compared to less intense block (TOF counts of 1-3).
• The maintenance and reversal of deep neuromuscular block present clinical and economic challenges, particularly without access to sugammadex.
• Further well-designed research is needed to definitively assess the benefits and drawbacks of deep neuromuscular block in laparoscopic surgery.