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Use of color Doppler imaging for determining the resistive index of the medial long posterior ciliary artery in clinically normal conscious dogs

Heechun Lee DVM, PhD1, Dongwoo Chang DVM, PhD2, Youngwon Lee DVM, PhD3, Kidong Eom DVM, PhD4, Hojung Choi DVM, MS5, Kangmoon Seo DVM, PhD6, Mincheol Choi DVM, PhD7, and Junghee Yoon DVM, PhD8
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  • 1 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
  • | 2 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
  • | 3 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Chungnam National University, Taejeon, Korea.
  • | 4 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
  • | 5 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
  • | 6 Department of Veterinary Medicine, Kangwon National University, Chunchon, Korea.
  • | 7 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
  • | 8 Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Seoul, Korea.

Abstract

Objective—To evaluate the use of color Doppler imaging (CDI) for determining the resistive index (RI) of the medial long posterior ciliary artery (mLPCA) in clinically normal conscious dogs.

Animals—18 (10 sexually intact males, 8 sexually intact females) dogs between 1 and 5 years old.

Procedure—Color Doppler ultrasonography was performed on both eyes with dogs in a sitting position. Each eye was imaged from the region dorsal to the zygomatic arch with the transducer positioned in a horizontal plane. The mLPCA was localized, and RI was calculated from velocities obtained for 3 similar Doppler waveforms. To determine the reproducibility of CDI-derived RI, measurements were repeated twice at a 10-day interval.

Results—Mean (± SD) RI of the mLPCA was 0.68 ± 0.07 (95% confidence interval, 0.65 to 0.70; n = 36 eyes). Resistive index did not significantly differ between right and left eyes or male and female dogs. In addition, body weight was not correlated with RI. Repeated measurements of RI did not yield significantly different results (interclass correlation coefficient, 0.8297).

Conclusions and Clinical Relevance—Color Doppler imaging appears to be a valid technique for determination of RI of the mLPCA in conscious dogs. This technique may be useful for investigating the pathophysiologic processes of many ocular and orbital vascular disorders in dogs. (Am J Vet Res 2002;63:211–214)

Abstract

Objective—To evaluate the use of color Doppler imaging (CDI) for determining the resistive index (RI) of the medial long posterior ciliary artery (mLPCA) in clinically normal conscious dogs.

Animals—18 (10 sexually intact males, 8 sexually intact females) dogs between 1 and 5 years old.

Procedure—Color Doppler ultrasonography was performed on both eyes with dogs in a sitting position. Each eye was imaged from the region dorsal to the zygomatic arch with the transducer positioned in a horizontal plane. The mLPCA was localized, and RI was calculated from velocities obtained for 3 similar Doppler waveforms. To determine the reproducibility of CDI-derived RI, measurements were repeated twice at a 10-day interval.

Results—Mean (± SD) RI of the mLPCA was 0.68 ± 0.07 (95% confidence interval, 0.65 to 0.70; n = 36 eyes). Resistive index did not significantly differ between right and left eyes or male and female dogs. In addition, body weight was not correlated with RI. Repeated measurements of RI did not yield significantly different results (interclass correlation coefficient, 0.8297).

Conclusions and Clinical Relevance—Color Doppler imaging appears to be a valid technique for determination of RI of the mLPCA in conscious dogs. This technique may be useful for investigating the pathophysiologic processes of many ocular and orbital vascular disorders in dogs. (Am J Vet Res 2002;63:211–214)