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Randomized comparison of sugammadex and neostigmine for reversal of rocuronium-induced muscle relaxation in morbidly obese undergoing general anaesthesia

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Background Complete and fast recovery of neuromuscular function is very important in morbidly obese patients because of the possible influence of postoperative residual curarization (PORC) on respiratory function in the postoperative period. Recent reports underline incidences of the residual influence of neuromuscular blocking agents.
Methods Seventy morbidly obese (BMI >40 kg m−2) patients requiring general anaesthesia and receiving rocuronium for muscle relaxation were randomly assigned into two groups: at the end of the anaesthetic procedure, one group received sugammadex 2 mg kg−1 of corrected body weight (Group SUG) and the other group received neostigmine 0.05 mg kg−1 of CBW (Group NEO). At the end of surgery and when response reached a train-of-four (TOF) score of 2, patients received the study drugs. The neuromuscular function was recorded and time to achieve 90% of TOF (safe extubation) was measured. Patients were examined directly after arrival to the post-anaesthesia care unit (PACU) by a blinded investigator for the presence of PORC.
Results Thirty-five patients received sugammadex and 35 neostigmine. Mean dose of rocuronium was 87.9 vs 85.6 mg (P>0.05), mean time to 90% of TOF was 2.7 vs 9.6 min (P<0.05), and TOF at the PACU was 109.8% vs 85.5% (P<0.05) in Groups SUG and NEO, respectively.
Conclusions Administration of sugammadex provides fast recovery of neuromuscular function and prevents PORC in the morbidly obese, however neostigmine does not. 

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