Conditions: Anesthesia, General
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 100
Healthy volunteers: no

Brief summary:
The objective of this trial was to establish the dose-response of T2 (the amplitude of the first response of second twitch to train of four (TOF) stimulation, expressed as percentage of control first twitch,T1) in Japanese and Caucasian participants. Part A: Japanese Participants

Detailed description:
For most surgical procedures a depth of neuromuscular block of 1-2 twitches after TOF-stimulation is sufficient to avoid unwanted muscular activity. At reappearance of T2, the anesthesiologist might decide to either give (another) maintenance dose of rocuronium or vecuronium when surgery continues, to await spontaneous recovery of neuromuscular block or to reverse the neuromuscular block. Sugammadex (Org 25969) has been shown in previous trials to greatly reduce the time to full recovery when administered at reappearance of T2, both after rocuronium- and vecuronium-induced neuromuscular blockade. The current trial P05956 was conducted in Japan and set up to establish the dose-response relationship of sugammadex given during sevoflurane anesthesia at reappearance of T2 after rocuronium or vecuronium in Japanese participants. In addition to recovery time, also pharmacokinetics and safety of sugammadex were evaluated.

Arms:
arm 1: After induction of anesthesia an intubation dose of 0.9 mg/kg rocuronium was administered intravenously (IV), followed by maintenance doses of 0.1-0.2 mg/kg rocuronium IV if necessary. At reappearance of T2 a single dose of placebo was administered IV. arm 2: After induction of anesthesia an intubation dose of 0.9 mg/kg rocuronium was administered IV, followed by maintenance doses of 0.1-0.2 mg/kg rocuronium IV if necessary. At reappearance of T2 a single dose of 0.5 mg/kg sugammadex was administered IV. arm 3: After induction of anesthesia an intubation dose of 0.9 mg/kg rocuronium was administered IV, followed by maintenance doses of 0.1-0.2 mg/kg rocuronium IV if necessary. At reappearance of T2 a single dose of 1.0 mg/kg sugammadex was administered IV. arm 4: After induction of anesthesia an intubation dose of 0.9 mg/kg rocuronium was administered IV, followed by maintenance doses of 0.1-0.2 mg/kg rocuronium IV if necessary. At reappearance of T2 a single dose of 2.0 mg/kg sugammadex was administered IV. arm 5: After induction of anesthesia an intubation dose of 0.9 mg/kg rocuronium was administered IV, followed by maintenance doses of 0.1-0.2 mg/kg rocuronium IV if necessary. At reappearance of T2 a single dose of 4.0 mg/kg sugammadex was administered IV. arm 6: After induction of anesthesia an intubation dose of 0.1 mg/kg vecuronium was administered IV, followed by maintenance doses of 0.02-0.04 mg/kg vecuronium IV if necessary. At reappearance of T2 a single dose of placebo was administered IV. arm 7: After induction of anesthesia an intubation dose of 0.1 mg/kg vecuronium was administered IV, followed by maintenance doses of 0.02-0.04 mg/kg vecuronium IV if necessary. At reappearance of T2 a single dose of 0.5 mg/kg sugammadex was administered IV. arm 8: After induction of anesthesia an intubation dose of 0.1 mg/kg vecuronium was administered IV, followed by maintenance doses of 0.02-0.04 mg/kg vecuronium IV if necessary. At reappearance of T2 a single dose of 1.0 mg/kg sugammadex was administered IV. arm 9: After induction of anesthesia an intubation dose of 0.1 mg/kg vecuronium was administered IV, followed by maintenance doses of 0.02-0.04 mg/kg vecuronium IV if necessary. At reappearance of T2 a single dose of 2.0 mg/kg sugammadex was administered IV. arm 10: After induction of anesthesia an intubation dose of 0.1 mg/kg vecuronium was administered IV, followed by maintenance doses of 0.02-0.04 mg/kg vecuronium IV if necessary. At reappearance of T2 a single dose of 4.0 mg/kg sugammadex was administered IV.

Interventions: intervention 1: sugammadex intervention 2: Placebo
Intervention descriptions: intervention 1: After induction of anesthesia an intubation dose of NMBA was administered IV: either 0.9 mg/kg rocuronium or 0.1 mg/kg vecuronium.

Maintenance doses of 0.1-0.2 mg/kg rocuronium IV or 0.02-0.04 mg/kg vecuronium IV could be administered if necessary.

At reappearance of T2 the randomized single dose of sugammadex (0.5 to 4 mg/kg) IV was administered. intervention 2: After induction of anesthesia an intubation dose of NMBA was administered IV: either 0.9 mg/kg rocuronium or 0.1 mg/kg vecuronium.

Maintenance doses of 0.1-0.2 mg/kg rocuronium IV or 0.02-0.04 mg/kg vecuronium IV could be administered if necessary.

At reappearance of T2 the randomized single dose of placebo IV was administered

Protocol document: