Evaluation of the time course of action of maintenance doses of rocuronium (ORG 9426) under halothane anaesthesia.
The time course of action of rocuronium was compared using three different sizes of maintenance doses after at least three subsequent administrations of the same repeat dose in each patients under halothane anaesthesia. Following endotracheal intubation facilitated with 0.6 mg.kg-1 rocuronium (ORG 9426), muscle relaxation was maintained in three groups each consisting of ten patients, using increments of equal repeat doses of either 75 micrograms.kg-1, 150 micrograms.kg-1 or 225 micrograms.kg-1 equivalent to 1/4, 1/2 and 3/4 of the ED95 of this new compound, respectively. Maintenance doses were administered when the twitch height depression induced by the previous dose returned to 25% of its control value. The clinical duration of the intubating dose averaged 27 +/- 7.5 min (mean +/- s.d.). The time course of action of the various maintenance doses depended on their size, but not on the number of administrations. The durations of repeat doses averaged 8-9 min, 14-16 min and 19-23 min after the low, medium and high maintenance doses, respectively. No overt cumulative effects were observed.
Clinics for Anaesthesia and General Intensive Care Medicine, University of Innsbruck, Austria.
K S
KS
Khuenl-Brady
F
F
Pühringer
J
J
Koller
G
G
Mitterschiffthaler
D000293:Adolescent; D000328:Adult; D000368:Aged; D000732:Androstanols / Q000008:administration & dosage / Q000494:pharmacology*; D000762:Anesthesia Recovery Period; D000769:Anesthesia, Inhalation; D004558:Electric Stimulation; D005069:Evaluation Studies as Topic; D005071:Evoked Potentials / Q000187:drug effects; D005260:Female; D006221:Halothane / Q000008:administration & dosage; D006801:Humans; D008297:Male; D008875:Middle Aged; D003473:Neuromuscular Nondepolarizing Agents / Q000008:administration & dosage / Q000494:pharmacology*; D000077123:Rocuronium; D009435:Synaptic Transmission / Q000187:drug effects; D013997:Time Factors; D014459:Ulnar Nerve / Q000187:drug effects / Q000502:physiology
D000732:Androstanols; D003473:Neuromuscular Nondepolarizing Agents; D006221:Halothane; D000077123:Rocuronium