ABSTRACT
La distrofia muscular de Becker es una enfermedad que afecta, sobre todo, al músculo esquelético y se caracteriza por necrosis de las fibras musculares y debilidad progresiva. Presentamos el caso de una paciente de 61 años, diagnosticada de esta enfermedad 45 años antes, que iba a ser intervenida de una neoplasia de mama derecha. Se le realizó una anestesia general con propofol, fentanilo y un bloqueante neuromuscular no despolarizante (rocuronio). Se empleó un monitor TOF Watch SX para evaluar continuamente la función neuromuscular por aceleromiografía, y se revirtió el bloqueo neuromuscular con sugammadex. Tras preoxigenación e inducción con fentanilo y propofol, se calibró el acelerómetro y se registró el cociente del tren de cuatro estímulos (TOFr) basal. Se inyectó rocuronio 1 mg/kg, y se evaluaron las respuestas del TOF cada 15 segundos. El máximo descenso del TOF (O) fue de 52 segundos. Se intubó la tráquea sin incidencias. Se mantuvo la anestesia intravenosa y la cirugía duró 74 min. El segundo componente del TOF (T2) reapareció a los 86 min de la dosis inicial. Se administró sugammadex 2 mg/kg. El tiempo desde la inyección de sugammadex hasta TOFr 0,7 fue de 79 seg, hasta TOFr 0,9 de 108 seg y TOFr 1,0 de 152 seg. No se observaron alteraciones electrocardiográficas ni hemodinámicas durante su administración y no hubo signos de bloqueo neuromuscular residual en el despertar ni acontecimientos adversos en las 24 horas posteriores (AU)
Becker muscular dystrophy affects mainly the musculoskeletal system, causing muscle wasting and progressive weakness. A 61-year-old woman with breast cancer, who had been diagnosed with Becker muscular dystrophy 45 years earlier, was scheduled for right mastectomy. We induced general anesthesia with propofol, fentanyl, and a nondepolarizing muscle blocker (rocuronium). Neuromuscular function was monitored continuously by acceleromyographic train-of-four ratio (TOFr) (Watch-SX monitor). The block was reversed with sugammadex. After preoxygenation with fentanyl and propofol, the device was calibrated and the baseline TOFr was recorded. We injected 1 mg/kg of rocuronium and assessed TOF responses every 15 seconds. The maximum decrease in TOF response (to 0 twitches) was at 52 seconds. Tracheal intubation was uneventful. Anesthesia was maintained by intravenous infusion. The operation lasted 74 minutes. The second TOF twitch (T2) reappeared 86 minutes after the initial dose. After we injected 2 mg/kg of sugammadex, a TOFr of 0.7 was reached at 79 seconds; a TOFr of 0.9 was reached at 108 seconds and a TOFr of 1.0 at 152 seconds. No electrocardiographic or hemodynamic abnormalities occurred during sugammadex administration and there were no signs of residual neuromuscular blockade on awakening or adverse events in the following 24 hours (AU)
Subject(s)
Adult , Female , Humans , Middle Aged , Muscular Dystrophies/complications , Muscular Dystrophies/drug therapy , Muscle, Skeletal , Anesthesia, General/methods , Anesthesia, General , Propofol/therapeutic use , Fentanyl/therapeutic use , Muscular Dystrophy, Duchenne/drug therapy , Neuromuscular Blocking Agents/pharmacokinetics , Neuromuscular Blocking Agents/therapeutic use , Anesthesia, General/instrumentation , Anesthesia, General/trends , Neuromuscular Blocking Agents/pharmacology , Neuromuscular Depolarizing Agents/pharmacokinetics , Neuromuscular Depolarizing Agents/therapeutic use , Muscular Dystrophy, Duchenne , Neuromuscular Blocking Agents/metabolism , Muscular Dystrophy, Duchenne/surgery , Muscular Dystrophy, Duchenne/diagnosisABSTRACT
Becker muscular dystrophy affects mainly the musculoskeletal system, causing muscle wasting and progressive weakness. A 61-year-old woman with breast cancer, who had been diagnosed with Becker muscular dystrophy 45 years earlier, was scheduled for right mastectomy. We induced general anesthesia with propofol, fentanyl, and a nondepolarizing muscle blocker (rocuronium). Neuromuscular function was monitored continuously by acceleromyographic train-of-four ratio (TOFr) (Watch-SX monitor). The block was reversed with sugammadex. After preoxygenation with fentanyl and propofol, the device was calibrated and the baseline TOFr was recorded. We injected 1 mg/kg of rocuronium and assessed TOF responses every 15 seconds. The maximum decrease in TOF response (to 0 twitches) was at 52 seconds. Tracheal intubation was uneventful. Anesthesia was maintained by intravenous infusion. The operation lasted 74 minutes. The second TOF twitch (T2) reappeared 86 minutes after the initial dose. After we injected 2 mg/kg of sugammadex, a TOFr of 0.7 was reached at 79 seconds; a TOFr of 0.9 was reached at 108 seconds and a TOFr of 1.0 at 152 seconds. No electrocardiographic or hemodynamic abnormalities occurred during sugammadex administration and there were no signs of residual neuromuscular blockade on awakening or adverse events in the following 24 hours.