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The effect of phenylephrine on the onset time of rocuronium

Authors
 Young Ju Won  ;  Yang-Sik Shin  ;  Ki-Young Lee  ;  Woon Young Cho 
Citation
 KOREAN JOURNAL OF ANESTHESIOLOGY, Vol.59(4) : 244-248, 2010 
Journal Title
 KOREAN JOURNAL OF ANESTHESIOLOGY 
ISSN
 2005-6419 
Issue Date
2010
Keywords
Onset time ; Phenylephrine ; Rocuronium
Abstract
BACKGROUND: Several studies have demonstrated that ephedrine shortens the onset time of muscle relaxants, and it does so probably by increasing the cardiac output. However, elevation of the systemic blood pressure through α adrenergic stimulation via ephedrine may affect the onset of muscle relaxants during the induction of anesthesia. We investigated the effect of phenylephrine, which is a selective α-1 agonist, on the onset time of rocuronium and the intubating conditions in adults after the administration of propofol. METHODS: Sixty-four patients were randomly assigned to two groups. Phenylephrine (0.9 µg/kg) (P group) or the same volume of saline (S group) was injected before rocuronium (0.6 mg/kg) administration. Anesthesia was induced with fentanyl 2 µg/kg and propofol 2 mg/kg. The onset time was defined as the time from the end of rocuronium injection to the time when a single twitch height gets to 0% or the minimum level. A well-trained anesthesiologist who was 'blinded' to the treatment groups evaluated the intubating conditions. The mean arterial pressure and heart rate were recorded before induction, before intubation, immediately after intubation and 1 minute and 2 minutes after intubation. RESULTS: The onset time was 84 ± 18 sec in the P-group and 72 ± 14 sec in the S-group. There was no difference of the intubating conditions, the mean arterial pressure and the heart rate between the two groups. CONCLUSIONS: A small dose of phenylephrine, which has a limited effect on blood pressure, delayed the onset time of rocuronium after the administration of propofol, and the vasoconstriction effect of phenylephrine may affect the prolongation of the rocuronium onset time at the induction of anesthesia with using propofol.
Files in This Item:
T201003414.pdf Download
DOI
10.4097/kjae.2010.59.4.244
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Anesthesiology and Pain Medicine (마취통증의학교실) > 1. Journal Papers
Yonsei Authors
Shin, Yang Sik(신양식)
Won, Young Ju(원영주)
Lee, Ki Young(이기영) ORCID logo https://orcid.org/0000-0003-4893-3195
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/102180
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