Cats diagnosed as aortic thromboembolism were performed with monotherapy using anticoagulant agent or combined therapy using thrombolytic agent, the efficacy of those therapies were discussed. Survival time, hours of forelimb or hind limb paralysis onset, palpable or not of pressure of femoral artery (unilateral or bilateral) on the first day, the days for palpable pressure of femoral artery, and pulmonary edema or not on the first day, were discussed between each therapy group. Fifteen cats were identified as having had a prescription filled for anticoagulant therapy using low molecular weight heparins (low molecular weight heparins group: n=8) or thrombolytic therapy using tissue plasminogen activator (low molecular weight heparins group+tPA group: n=7) between 2002 and 2011. The half survival time of low molecular weight heparins group and low molecular weight heparins group+tPA group were 742 and 5 days, respectively, in low molecular weight heparins group, survival time was longer significantly than that of low molecular weight heparins group+tPA group (p<0.05).

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12歳7カ月齢のパピヨンが消化器症状を主訴に来院した。身体検査を行い呼吸循環器疾患が疑われたためスクリーニング検査を実施したところ，心エコー検査にて右心室内腔のほとんどを占拠した腫瘍が見られ，その腫瘍は右心房内にも突出していた。この腫瘍により血液の流入流出障害が発現しうっ血性心不全を呈していた。X線検査所見から肺転移も疑われ，治療は対症療法を継続したが第34病日に死亡した。病理検査の結果，心臓血管肉腫ならびにその肺転移が認められた。本症例は心臓内腔に発生した血管肉腫が原因で心不全を発現したが，この診断には心エコー検査が有用であった。完治できない腫瘍が心臓にあったとしても，あらかじめ動物の家族が今後起こりうる病態を把握しておくことは経過を見るうえで重要である。

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A 13-years-old female Shiba-breed dog was seen because of syncope and wobbling motion. A monitoring scalar electrocardiography showed high frequency sinus arrests and atropine test was positive. Oral atropine sulfate had been administered for the treatment. Afterwards, the clinical sign had disappeared. On the 378th day, syncope relapsed again and atropine test became negative. Based on the results of electrocardiography and atropine test, Sick Sinus Syndrome was strongly suspected. Administration of cilostazol, which is a phosphodiesterase inhibitor, and enalapril maleate resulted in an immediate disappearance of the clinical signs again. Monitoring holter electrocardiography was conducted before and after the treatment. The cilostazol therapy couldn't increase the total daily heat-beat counts. However, frequency of sinus arrest that exceeds 6 seconds decreased, and the maximal period of sinus arrest was favorably shortened.

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