Korean Journal of Veterinary Research 2005;45(3):423-427.
Effects of anesthetics on resistive index of the medial long posterior ciliary artery and ophthalmic artery using color doppler imaging
Ho-jung Choi1, Young-won Lee1, Jung-hee Yoon2, Seong-chan Yeon3, Hyo-jong Lee3, Hee-chun Lee3
1College of Veterinary Medicine, Chungnam National University
2College of Veterinary Medicine, Seoul National University
3College of Veterinary Medicine, Gyeongsang National University
Abstract
Color Doppler imaging (CDI) was carried out to evaluate the anesthetics effect on ophthalmic circulation using CDI-derived resistive index (RI) values. CDI was preformed on 24 dogs, and RI values were calculated for the medial long posterior ciliary artery (mLPCA) and ophthalmic artery (OA) before and after administration of anesthetics. After administration of benoxinate or acepromazine, a significant change of the mLPCA RI was not found. But, a significant decrease of the RI following ketamine (p < 0.001) or xylazine (p < 0.01) administration could be observed as compared with the self-control. Mean RI value of OA also showed this same trend. Intraocular pressure was significantly decrease following benoxinate (p < 0.01), acepromazine (p < 0.01), and xylazine (p < 0.001) administration within normal range. The results suggest that some anesthetics influence on ophthalmic vascular resistance. Therefore, chemical restraint was carefully used in clinical application of CDI-derived RI measurement. Particularly, benoxinate and acepromazine is useful chemical restraint without a change of the ophthalmic vascular resistance.
Key Words: color Doppler imaging, resistive index, ophthalmic vasculature, anesthetics, dogs
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