患者女性,50岁。患风湿性心脏病、二尖瓣狭窄伴关闭不全。口服地高辛0.25mg/日2月余。因心悸、气短加重2天加服地高辛0.25mg,症状无缓解,于1985年10月16日就诊,心电图为非阵发性交界性心动过速,提示洋地黄过量,收住院。入院后描记心电图(附图),经停用洋地黄和补钾等治疗,第5天恢复窦性心律。附图为定标电压2mV描记,窦性P波消失,p′-p′和R-R间距不等,呈规律性的长短交替,且长间距小于短间距的2倍,提示这种二联律现象为房室交界性心律伴3:2双向性文氏型阻滞。其前向传导时间长于逆向传导时间。故每次P′波皆落在QRS波之 Female patient, 50 years old. Suffering from rheumatic heart disease, mitral stenosis with incomplete closure. Oral digoxin 0.25mg / day more than 2 months. Due to heart palpitations, shortness of breath plus 2 days plus digoxin 0.25mg, no relief of symptoms, in October 16, 1985 treatment, ECG non-paroxysmal borderline tachycardia, suggesting that digitalis excess, admitted to hospital. After admission, electrocardiogram (with photos), after stopping the treatment of digitalis and potassium, the 5th day to restore sinus rhythm. The figure for the calibration voltage 2mV trace, sinus P wave disappears, p’-p ’and RR intervals ranging from regular alternating length and long spacing less than 2 times the short pitch, suggesting that this bi-law phenomenon For the atrioventricular junctional rhythm with 3: 2 bidirectional Venturi block. The forward conduction time is longer than the reverse conduction time. Therefore, each P ’wave falls on the QRS wave