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非时相性房内差异传导(non-phasic aberrant(?)trial conduction,N—PAAC)系罕见的心律失常,1972年钟氏首先报告,故称钟氏现象.特点为房性早搏后窦性搏动的 P 波外形奇特,与窦性及房性早搏的 P 波外形不同.除房性早搏外,房室交界性早搏、室性早搏及并行收缩性搏动后也可发生。通常仅异位搏动后的第一个实性 P 波畸形,偶可表现为两个或两个以上的窦性 P 渡畸形,但以第一个明显.心电图表现1.房早后 N—PAAC:最常见,并且与配对时
Non-phasic aberrant trial conduction (N-PAAC) is a rare type of arrhythmia, first reported in 1972, Chung, it is called Chung’s phenomenon, characterized by atrial premature beats after sinus beats Of the P wave strange appearance, and sinus and atrial premature beat P wave shape is different.In addition to atrial premature beats, atrioventricular borderline premature beats, ventricular premature beats and contractile beats may occur. Normally only the first real P-wave deformity after ectopic beating can even be manifested as two or more sinus P-wave deformities, but with the first obvious. Electrocardiographic findings 1. Atrial early N-PAAC : The most common, and when paired