Severe Pulmonary Stenosis and Bidirectional Shunting Muscular Ventricular Septum Defect in a Dog

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  • NAKAMURA Takashi
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • UECHI Masami
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • MIZUNO Masashi
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • UCHIDA Shuuhei
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • KASUYA Arane
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • HARADA Kayoko
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • KONO Shota
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • SHINODA Asako
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • ENDOH Masaaki
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • SAWADA Tamotsu
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • MIZUNO Takeshi
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University
  • FUNAYAMA Marina
    Department of Veterinary Medicine, College of Bio-resource Sciences, Nihon University

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Other Title
  • 重度の肺動脈弁狭窄症に両方向性短絡の心室中隔欠損症を合併した犬の一例
  • 症例報告 重度の肺動脈弁狭窄症に両方向性短絡の心室中隔欠損症を合併した犬の一例
  • ショウレイ ホウコク ジュウド ノ ハイ ドウミャクベン キョウサクショウ ニ リョウ ホウコウセイ タンラク ノ シンシツ チュウカクケッソンショウ オ ガッペイ シタ イヌ ノ イチレイ

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Abstract

A 4-year-old border collie dog with syncope was refered. Arterial oxygen saturation measured by pulse oximeter was low, and echocardiograph revealed pulmonary stenosis and bidirectional shunting muscular ventricular septum defect (VSD). As flow velocity of pulmonary artery was 5.3 m/sec with concentric hypertrophy of right ventricular and right-to-left shunting VSD in systole, we diagnosed pulmonary stenosis was severe, so performed surgical relief of pulmonary stenosis under the cardiopulmonary bypass. Postoperatively, although flow velocity of pulmonary artery was high, we suggested that surgical relief of pulmonary stenosis was effective for improving hemodynamics because of disappearance of syncope, improvement of arterial oxygen saturation, left-to-right shunting VSD in systole due to reversal of pressure gradient between right and left ventricular. Because Qp/Qs was 1.35, we speculated that increasing of shunt blood was responsible for high velocity of pulmonary artery.

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