title: Effect of lung-protective ventilation-induced respiratory acidosis on the duration of neuromuscular blockade by rocuronium.
abstract: The purpose of this study was to elucidate whether lung-protective ventilation-induced respiratory acidosis increased the duration of neuromuscular blockade by rocuronium.
  
  
  
  A total of 72 patients were enrolled. After the induction of general anesthesia, rocuronium 0.6 mg/kg real body weight was administered. Tidal volume and positive end-expiratory pressure were randomly assigned as either 10 ml/kg predicted body weight and 0 cmH2O (group S) or 6 ml/kg and 5 cmH2O (group L), respectively. Respiratory rate was started at 10/min. Neuromuscular blockade was monitored by acceleromyography at the adductor pollicis with train-of-four stimulation. The time from the initial bolus injection of rocuronium to first recovery of the first twitch was defined as DUR1. Immediately, rocuronium 0.15 mg/kg was administered. The time from first recovery of the first twitch to second recovery of the first twitch was defined as DUR2. We also measured arterial pH (pH1 and pH2, respectively).
  
  
  
  Data from 66 patients (33 each in groups L and S) were eventually available. pH1 and pH2 were significantly lower in group L compared with group S [pH1: 7.308 (7.288-7.334) vs. 7.439 (7.423-7.466); p < 0.01, pH2: 7.306 (7.285-7.330) vs. 7.453 (7.436-7.476); p < 0.01]. DUR1 and DUR2 were significantly prolonged in group L compared with group S [DUR1: 31 (24-36) vs. 24 (20-30) min; p = 0.029, DUR2: 19 (15-22) vs. 15 (12-17) min; p = 0.020].
  
  
  
  Lung-protective ventilation-induced respiratory acidosis increased the duration of neuromuscular blockade by rocuronium.
authors: Department of Anesthesiology and Oncological Pain Medicine, Fukuyama City Hospital, 5-23-1, Zao-cho, Fukuyama, Hiroshima, 721-8511, Japan. shitaguchi39@gmail.com.
authors: Shinya
authors: 0000-0002-9868-0651
authors: S
authors: Taguchi
authors: Department of Anesthesiology and Oncological Pain Medicine, Fukuyama City Hospital, 5-23-1, Zao-cho, Fukuyama, Hiroshima, 721-8511, Japan.
authors: Kazumi
authors: K
authors: Ono
authors: Department of Anesthesiology and Oncological Pain Medicine, Fukuyama City Hospital, 5-23-1, Zao-cho, Fukuyama, Hiroshima, 721-8511, Japan.
authors: Hidekuni
authors: H
authors: Hidaka
authors: Department of Anesthesiology and Oncological Pain Medicine, Fukuyama City Hospital, 5-23-1, Zao-cho, Fukuyama, Hiroshima, 721-8511, Japan.
authors: Yusuke
authors: Y
authors: Koyama
mesh_terms: D000142:Acidosis, Respiratory / Q000209:etiology*; D000368:Aged; D000732:Androstanols / Q000008:administration & dosage*; D000768:Anesthesia, General / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D018482:Muscle, Skeletal / Q000187:drug effects; D019148:Neuromuscular Blockade / Q000379:methods*; D003473:Neuromuscular Nondepolarizing Agents / Q000008:administration & dosage*; D011175:Positive-Pressure Respiration; D012121:Respiration, Artificial / Q000379:methods; D000077123:Rocuronium
chemical_list: D000732:Androstanols; D003473:Neuromuscular Nondepolarizing Agents; D000077123:Rocuronium
keywords: Lung-protective ventilation; Neuromuscular blockade; Respiratory acidosis; Rocuronium; pH