A Bridging Trial Comparing Sugammadex (Org 25969) at Reappearance of T2 in Japanese and Caucasian Participants. Part A: Japanese Participants (P05956)

A Multi-Center, Randomized, Open-Label, Prospective Bridging, Parallel Dose-Finding Trial Comparing Efficacy, Safety and Pharmacokinetics of 4 Doses of Org 25969 and Placebo Administered at Reappearance of T2 After Rocuronium or Vecuronium in Japanese and Caucasian Subjects. Part A: Japanese Subjects

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

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.

Inclusion Criteria:

• Is of American Society of Anesthesiologists (ASA) class 1 - 3;
• Is at least 20 years but under 65 years of age;
• Japanese participants;
• Is scheduled for elective surgery in supine position and under sevoflurane anesthesia, in need of administration of neuromuscular blocking agents (NMBAs), with an anticipated duration of about 1.5-3 hours;
• Has given written informed consent.

Exclusion Criteria:

• Participants in whom a difficult intubation because of anatomical malformations was expected;
• Is known or suspected to have neuromuscular disorders impairing the effect of NMBAs and/or significant renal dysfunction (for example a creatinine level > 1.6 mg/dl) and/or severe hepatic dysfunction.
• Is known or suspected to have a (family) history of malignant hyperthermia;
• Is known or suspected to have an allergy to narcotics, muscle relaxants or other medication used during general anesthesia;
• Is receiving medication expected to interfere with the rocuronium or vecuronium given in this trial, based on the dose and time of administration;
• Females who were pregnant;
• Females not using birth control or using only oral contraception as birth control continuously;
• Were breast-feeding;
• Has already participated in P05956, or in another trial with sugammadex;
• Has participated in another clinical trial within 6 months of entering into P05956