title: Equi-lasting doses of rocuronium, compared to mivacurium, result in improved neuromuscular blockade in patients undergoing gynecological laparoscopy : [Des doses de durée équivalente de rocuronium, comparé au mivacurium, améliorent la curarisation chez des patientes qui subissent une laparoscopie gynécologique].
abstract: OBJECTIVE
  To compare equi-lasting doses of a short-acting (mivacurium) to an intermediate-acting (rocuronium) neuromuscular relaxant, with regard to intubating conditions, efficacy, number of maintenance doses, hemodynamic alterations, adverse events and costs, in patients undergoing laparoscopic gynecological surgery.
  
  
  METHODS
  Sixty patients were randomly allocated to receive either 0.2 mg*kg(-1) (3 x ED(95)) mivacurium or 0.5 mg*kg(-1) (1.7 x ED(95)) rocuronium, under propofol/fentanyl anesthesia. T1, first twitch of the train-of-four (TOF) and TOF ratio (T4:T1) were used to evaluate neuromuscular block using the Relaxometer(R) mechanomyograph. The trachea was intubated when T1 was maximally suppressed. Neuromuscular block was maintained at 25% T1 with equi-lasting doses of 0.075 mg*kg(-1) mivacurium or 0.15 mg*kg(-1) rocuronium.
  
  
  RESULTS
  Mean (min) +/- SD mivacurium onset time (1.9 +/- 0.4) was longer than that of rocuronium (1.3 +/- 0.3). This did not yield a statistical difference in intubating conditions between the two groups. Interval 25-75% T1 recovery and time to 0.8 TOF recovery were prolonged following rocuronium (11.9 +/- 3.9, 52.6 +/- 15.5 respectively) compared to mivacurium (6.7 +/- 2.3, 39.2 +/- 8.1 respectively). More patients, 22/30, required mivacurium maintenance doses compared to 14/30 patients in the rocuronium group. Arterial blood pressure declined and 13/30 patients manifested erythema following mivacurium administration. The acquisition costs of rocuronium (6.93 Euro/patient) were 23% lower compared to mivacurium (8.96 Euro/patient).
  
  
  CONCLUSIONS
  Equi-lasting doses of rocuronium resulted in favourable intubating conditions more rapidly, improved hemodynamic stability, required less frequent administration of maintenance doses and were not associated with erythema, compared to mivacurium.
authors.affiliation: Department of Anaesthesia, Lainz Hospital, Vienna, Austria. Ashraf.Dahaba@kfunigraz.ac.at
authors.forename: A A
authors.initials: AA
authors.lastname: Dahaba
authors.forename: E
authors.initials: E
authors.lastname: Schweitzer
authors.forename: R D
authors.initials: RD
authors.lastname: Fitzgerald
authors.forename: S
authors.initials: S
authors.lastname: Schwarz
mesh_terms: D000293:Adolescent; D000328:Adult; D000732:Androstanols / Q000008:administration & dosage / Q000009:adverse effects / Q000191:economics; D000769:Anesthesia, Inhalation; D004311:Double-Blind Method; D005260:Female; D013509:Gynecologic Surgical Procedures; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D007442:Intubation, Intratracheal; D007546:Isoquinolines / Q000008:administration & dosage / Q000009:adverse effects / Q000191:economics; D010535:Laparoscopy; D008875:Middle Aged; D000077590:Mivacurium; D019148:Neuromuscular Blockade / Q000009:adverse effects / Q000191:economics; D003473:Neuromuscular Nondepolarizing Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000191:economics; D011446:Prospective Studies; D000077123:Rocuronium
chemical_list: D000732:Androstanols; D007546:Isoquinolines; D003473:Neuromuscular Nondepolarizing Agents; D000077590:Mivacurium; D000077123:Rocuronium