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Oral clonidine does not change ventilatory response to carbon dioxide in sevoflurane‐anesthetized children
Author(s) -
NISHINA KAHORU,
MIKAWA KATSUYA,
UESUGI TAKANOBU,
OBARA HIDEFUMI
Publication year - 2004
Publication title -
pediatric anesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.704
H-Index - 82
eISSN - 1460-9592
pISSN - 1155-5645
DOI - 10.1111/j.1460-9592.2004.01371.x
Subject(s) - medicine , sevoflurane , anesthesia , clonidine , carbon dioxide , ecology , biology
Summary Background : Clonidine is a useful premedicant for pediatric anesthesia. The drug has potential for ventilatory depression. The aim of the current study was to determine the effects of clonidine premedication on the ventilatory response to hypercapnia during sevoflurane anesthesia using the carbon dioxide (CO 2 ) steady state method. Methods : Sixty children (3–13 yr) were assigned to receive clonidine 4 μ g·kg −1 or placebo. Anesthesia was maintained with spontaneous breathing and 2% sevoflurane. Minute ventilation (VE), respiratory rate (RR), endtidal CO 2 pressure ( P E co 2 ), and arterial hemoglobin oxygen saturation (SpO2) were measured with a facemask tightly fitted before and during 7% CO 2 inhalation. Results : Compared with placebo, oral clonidine failed to reduce VE volume before CO 2 loading under general anesthesia with 2% sevoflurane. Inhalation of CO 2 increased VE. Oral clonidine did not attenuate the increase in VE induced by hypercapnic challenge under sevoflurane anesthesia. There were no differences in RR, P E co 2 , or SpO2 between the placebo and clonidine groups before and during CO 2 loading. Conclusion : These data suggest that oral clonidine is a suitable premedication for sevoflurane anesthesia under spontaneous breathing conditions in children.