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Transition time: a new parameter coinciding with fair intubating conditions.
J C De Mey1, M Ongenae, E Mortier
1Department of Anaesthesia, University Hospital, Gent, Belgium.
Acta Anaesthesiologica Belgica
|October 26, 1999
Summary
The transition time, a new measure of neuromuscular blockade, better predicts optimal intubating conditions than traditional onset times after rocuronium administration. This parameter offers a more reliable indicator for clinical relaxation assessment.
Area of Science:
- Anesthesiology
- Pharmacology
- Neuromuscular Pharmacology
Background:
- Rocuronium is a neuromuscular blocking agent used in anesthesia.
- Assessing the onset of neuromuscular blockade is crucial for intubation.
- Traditional measures like adductor pollicis muscle onset time may not perfectly correlate with optimal intubating conditions.
Purpose of the Study:
- To define and evaluate the 'transition time' as a novel parameter for neuromuscular relaxation.
- To determine if the transition time correlates with optimal intubating conditions after rocuronium administration.
Main Methods:
- Determined onset of relaxation parameters (lag time, transition time, onset time) in 20 patients receiving 0.60 mg/kg rocuronium.
- Evaluated the correlation between transition time and intubating conditions in 40 additional patients.
Main Results:
- The median transition time was 67.4 seconds, with 76.2% relaxation.
- Intubating conditions were significantly better at the relaxation level corresponding to the transition time.
- Transition time was found to approximate intubating time.
Conclusions:
- Transition time is a valuable parameter for assessing neuromuscular relaxation.
- This parameter correlates with fair intubating conditions and can be preferred for determining optimal intubation timing.