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Clinical responses to ORG 9426 during isoflurane anesthesia
T J Quill1, M Begin, P S Glass
1Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina.
Anesthesia and Analgesia
|February 1, 1991
Summary
This study evaluated ORG 9426, a neuromuscular relaxant, in adult patients. Results indicate it has a rapid onset and short duration, with no observed cardiovascular side effects, suggesting potential for clinical use.
Area of Science:
- Anesthesiology
- Pharmacology
- Clinical Medicine
Background:
- Neuromuscular relaxants are crucial in anesthesia.
- Understanding dose-response and pharmacodynamics is vital for safe clinical application.
- ORG 9426 is a novel neuromuscular relaxant requiring characterization.
Purpose of the Study:
- To determine the dose-response curve, onset time, and recovery profile of ORG 9426.
- To assess average dose requirements for neuromuscular blockade.
- To evaluate pharmacodynamic characteristics prior to general clinical use.
Main Methods:
- Seventy-two adult patients received varying doses (120-240 mcg/kg) of ORG 9426.
- Neuromuscular blockade was monitored using ulnar evoked electromyography.
- Log probit analysis was used to determine effective dose values (ED50, ED90, ED95).
Main Results:
- The ED95, ED90, and ED50 were determined to be 268, 251, and 144 mcg/kg, respectively.
- Rapid onset (80% blockade in 1.9 min) and average peak effect time of 4.6 min were observed.
- Short clinical duration (20.5 min) and recovery index (15.4 min) were noted, with no cumulative effects from maintenance doses.
Conclusions:
- ORG 9426 is a nondepolarizing neuromuscular relaxant.
- It exhibits a rapid onset and short duration of action.
- Further clinical evaluation is warranted due to its favorable profile and lack of cardiovascular side effects.
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