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: Case report  Taiwan

[In Press] Case Report: Successful Reversal of Residual Block with Sugammadex in a Patient Not Known to Have Myasthenia Gravis

Unusual clinical course, Challenging differential diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Unexpected drug reaction , Clinical situation which can not be reproduced for ethical reasons

Ko-Ching Kuo1E, Chih-Shung Wong1AD, Tzong-Jeng Wu1DG

Am J Case Rep In Press; DOI:   :: ID: 937128

Available online: , In Press, Corrected Proof

Publication in the "In-Press" formula aims at speeding up the public availability of the pending manuscript while waiting for the final publication. The assigned DOI number is active and citable. The availability of the article in the Medline, PubMed and PMC databases as well as Web of Science will be obtained after the final publication according to the journal schedule

Abstract

BACKGROUND
Incomplete recovery from residual neuromuscular block agent (NMBA) after anesthesia is a serious adverse event in the post-anesthesia care unit. Acetylcholinesterase neostigmine is usually used to reverse residual neuromuscular blockade and facilitate spontaneous breathing and endotracheal extubation.
CASE REPORT
A 40-year-old woman received general anesthesia for strabismus correction surgery. At the end of surgery, repeated doses of neostigmine up to 85 µg/kg failed to reverse the residual neuromuscular blockade (train-of-four [TOF] ratio below 21%). Sugammadex (200 mg) provided immediate reversal, with the TOF ratio up to 100%. The patient regained spontaneous breathing, and the endotracheal tube was removed. After surgery, myasthenia gravis was diagnosed.
CONCLUSIONS
When unexpected prolonged neuromuscular blockade presents, the TOF ratio should be used to detect its depth and guide a reasonable dose of reversal agents. Anticholinesterase has a ceiling effect; once acetylcholinesterase activity is fully inhibited, administration of additional anticholinesterase can result in no further recovery. Furthermore, excessive acetylcholine can cause muscle weakness. In contrast, sugammadex is a selective reversal agent for steroidal NMBA, which works by encapsulation via tight water-soluble complexes with amino steroids (eg, rocuronium) rather than increasing acetylcholine at the neuromuscular junction. In this case, the recovery from moderate neuromuscular blockade by sugammadex was more effective and rapid than that by neostigmine. When refractory and prolonged residual neuromuscular blockade presents after repeated doses of anticholinesterase, sugammadex should be considered as an effective reversal agent. Particularly in cases of myasthenia gravis, sugammadex is superior to neostigmine for reversing rocuronium-induced NMBA in patients undergoing surgery.

Keywords: Myasthenia Gravis; Neostigmine; Neuromuscular Monitoring; Postanesthesia Nursing; Sugammadex

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923