48 下圖是由一隻10 歲雌性混種犬所記錄的bipolar 心電圖(紙速25 mm/sec;1 cm =1 mV),其主要的 異常為:
(A)second degree atrioventricular heart block
(B)Wolff-Parkinson-White syndrome
(C)ventricular escape rhythm
(D)atrial trigeminy

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統計: A(206), B(12), C(71), D(12), E(0) #1178444