フレキシブル・アリゲーター鉗子による犬糸状虫性血色素尿症例の虫体摘出効果

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  • Efficacy of heartworm removal in dogs with dirofilarial hemoglobinuria using flexible alligator forceps.
  • フレキシブル・アリゲーター鉗子による犬糸状虫性血色素尿症例の虫体摘出効果〔英文〕
  • フレキシブル アリゲーター カンシ ニ ヨル イヌ シジョウチュウセイ ケッシ

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Heartworms were removed from the right atrium and the pulmonary arteries through the jugular vein using a flexible alligator forceps in dogs with dirofilarial hemoglobinuria (caval syndrome). In 23 outpatient dogs (without autopsy), the heartworms in the right atrium and the tricuspid valve orifice were removed completely. Moreover, 1 to 36 worms were removed from the pulmonary artefy in 16 of 23 dogs (69.9%). In 9 experimental dogs with autopsy, 8 to 34 worms were removed from the right atrium, and 1 to 21 worms were removed from the pulmonary artery in all dogs. Zero to 11 worms remained in the pulmonary arteries, and mean removal efficacy was 89.3% in 9 dogs. Cardiopulmonary values were measured before and 24 hr after heartworm removal in 9 experimental dogs. Right cardiac output, cardiac index and stroke volume tended to increase in 5 dogs which recovered after heartworm removal. These parameters tended to decrease in 3 of 4 dogs with poor prognosis. Pressures in the pulmonary artery and the right ventricle ranged variously from normal value to extremely higher level (>100 mmHg) before heartworm removal. The pressures showed varying changes after heartworm removal without correlation to the prognosis. The heartworm removal with a flexible alligator forceps was safer and more available than that with a hard forceps as therapy for canine dirofilarial hemoglobinuria, because the worms in the right atrium and the tricuspid valve orifice could be removed completely, and the worms in the pulmonary artery were also removed with high efficacy and no harm.

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