Abstract:
BACKGROUND:Dexmedetomidine is an alpha 2 agonist with potential utility in clinical anesthesia for both its sedative and sympatholytic properties. METHODS:The pharmacokinetics and hemodynamic changes that occurred in ten healthy male volunteers were determined after administration of dexmedetomidine 2 micrograms/kg by intravenous or intramuscular route in separate study sessions. RESULTS:The intramuscular absorption profile of dexmedetomidine, as determined by deconvolution of the observed concentrations against the unit disposition function derived from the intravenous data, was biphasic. The percentage bioavailability of dexmedetomidine administered intramuscularly compared with the same dose administered intravenously was 73 +/- 11% (mean +/- SD). After intramuscular administration, the mean time to peak concentration was 12 min (range 2-60 min) and the mean peak concentration was 0.81 +/- 0.27 ng/ml. After intravenous administration of dexmedetomidine, there were biphasic changes in blood pressure. During the 5-min intravenous infusion of 2 micrograms/kg dexmedetomidine, the mean arterial pressure (MAP) increased by 22% and heart rate (HR) declined by 27% from baseline values. Over the 4 h after the infusion, MAP declined by 20% from baseline and HR rose to 5% below baseline values. The hemodynamic profile did not show acute alterations after intramuscular administration. During the 4 h after intramuscular administration, MAP declined by 20% and HR declined by 10%. CONCLUSIONS:The intramuscular administration of dexmedetomidine avoids the acute hemodynamic changes seen with intravenous administration, but results in similar hemodynamic alterations within 4 h.
journal_name
Anesthesiologyjournal_title
Anesthesiologyauthors
Dyck JB,Maze M,Haack C,Vuorilehto L,Shafer SLdoi
10.1097/00000542-199305000-00002subject
Has Abstractpub_date
1993-05-01 00:00:00pages
813-20issue
5eissn
0003-3022issn
1528-1175journal_volume
78pub_type
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