ファロー四徴子牛の臨床,超音波診断および剖検所見 Tetralogy of Fallot in a Calf : Clinical, Ultrasonographic, Laboratory and Postmortem Findings

6ヵ月齢の雌子牛が呼吸障害,食欲不振および脱水を呈し,左右胸部で粗い心雑音を聴取した。超音波診断により右心室および右心房の著しい拡張,心筋と乳頭筋の肥大,心室中隔の肥厚および中隔の上方に大きな欠損孔が認められた。大動脈は右方に転位し両心室に騎乗していた。剖検によってファロー四徴と診断された。

A 6-month-old female Holstein calf was referred with a history of respiratory distress, anorexia and dehydration. When first examined, a loud harsh murmur was clearly audible from both sides of the thorax. Two-dimentional echocardiography demonstrated a markedly dilated right ventricle and right atrium, hypertrophied myocardium, prominent papillary muscles and a thickened interventricular septum (IVS). A large-sized ventricular septal defect was imaged at the top of the IVS. The aorta was dextrally located and over-riding both ventricles. The diagnosis was confirmed as tetralogy of fallot on postmortem examination.