대한수의학회지 (Korean Journal of Veterinary Research)

  • 제47권1호
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  • Pages.103-115
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  • 2007
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  • 2466-1384(pISSN)
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  • 2466-1392(eISSN)
대한수의학회 (The Korean Society of Veterinary Science)
권호 표지

Isofourane으로 마취된 개에 medetomidine, medetomidine-buprenorphine, medetomidine-fentanyl의 경막외 투여 시 심혈관계 반응과 진통효과의 비교

Comparision of cardiovascular and analgesic effects of epidural administration of medetomidine, medetomidine-buprenorphine and medetomidine-fentanyl in dogs anesthetized with isoflurane

  • Chang, Hwa-Seok (College of Veterinary Medicine, Konkuk University) ;
  • Kim, Hye-Jin (College of Veterinary Medicine, Konkuk University) ;
  • Choi, Chi-Bong (College of Veterinary Medicine, Konkuk University) ;
  • Lee, Jung-Sun (College of Veterinary Medicine, Konkuk University) ;
  • Kim, Hwi-Yool (College of Veterinary Medicine, Konkuk University)
  • 심사 : 2007.03.21
  • 발행 : 2007.03.30
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초록

The aim of this study was to compare the reaction of the cardiovascular system, and the anesthetic effect among 3 experimental groups, epidural administration of medetomidine as a single agent, the combination of buprenorphine and medetomidine, and the combination of fentanyl and medetomidine. Twenty one dogs were anesthetized with isoflurane and allowed to breathe spontaneously. Epidural, arterial, and venous catheters were inserted. The tip of epidural catheter was positioned at the level of the space between the sixth and seventh lumbar vertebra. After a stable plane of anesthesia was achieved, these dogs were each administered one of the following treatments epidurally : medetomidine $10{\mu}g/kg$ (Group M), a combination of medetomidine $5{\mu}g/kg$ and buprenorphine $10{\mu}g/kg$ (Group M/B), and a combination of medetomidine $5{\mu}g/kg$ and fentanyl $10{\mu}g/kg$ (Group M/F). Heart rate (HR), Respiratory rate (RR), End-tidal carbon dioxide (EtCO2), and arterial blood pressure were measured before drug administration (base line) and 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, and 60 min postinjection. Blood gas analysis was performed before injection and 5, 15, 25, 35, 45, 60 min postinjection. Isoflurane was discontinued 80 min postinjection and pain/motor function were evaluated up to 260 min postinjection every 15 min. At the early stage of drug introduction (until 5 min), the HR was decreased significantly in all 3 groups compared with base line. In Group M, HR was significantly decreased compared with the other 2 groups. With time (starting 20 min after drug introduction), the HR was decreased significantly in Group M/B in respect to base line. However, no significant difference was seen number-wise in all 3 groups. During 60 min after drug introduction, the systolic, diastolic and mean arterial pressures were highest in Group M and lowest in Group M/F. Among 3 groups, drug action and motor loss duration were longest in Group M/F. Analgesic effect observed in the M/F group was the most prominent and long-lasting, compared to those seen in the other 2 groups. Given the fact that the recovery of motor function takes place in a short period of time after analgesic effects disappeared, additional use of M/F depending on the patient's condition would be a good way to achieve effective pain management. However, proper care should be taken to ensure the function of cardiovascular system in the patient because the administration of M/F under isoflurane anesthesia results in a significant decline in arterial blood pressure ($65{\pm}10mmHg$).

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