隐匿性交界处早搏(简称结早)和隐匿性室早引起干扰性房室传导受阻,临床少见,且易漏诊。最近我们遇到2例隐匿性结早和室早引起假性Ⅱ度Ⅱ型房室传导阻滞,报告于后。临床和心电图资料例1 女性,16岁,因心前区隐痛伴心悸半月来我院就诊。入院体检:体型瘦长,心率约110次,心律不齐,早搏频繁,心尖部可闻及Ⅱ级收缩期吹风样杂音。双肺阴性。腹软,肝、脾肋下未及。血、尿常规、血沉均在正常范围。胸部平片心影大小正常。二维超声心动图提示二尖瓣前瓣脱垂。心电图描记见图 1.临床诊断:二尖瓣脱垂。心电图分析:为Ⅱ导联记录,窦性P波频率110次,同导联中可见3个期前出现的搏动,第二个早搏较宽大,T波与主波方向相反,可判断为室性早搏。第1、3个早搏其前有P波,P—R>0.12秒,其形态介 Occult Junction premature beats (referred to as the knot as early as) and the occult Room early caused by disturbing atrioventricular conduction blocked, rare clinical, and easy to miss. Recently, we encountered two cases of occult early and early nocturnal pseudo-degree Ⅱ atrioventricular block, reported later. Clinical and electrocardiographic data example 1 female, 16 years old, due to precordial pain and palpitations half a month to our hospital. Admission medical examination: body length, heart rate about 110 times, arrhythmia, frequent premature beats, apex can be heard and Ⅱ grade systolic hair-like murmur. Lung negative. Abdominal soft, liver, spleen under the ribs. Blood, urine, ESR are in the normal range. Chest flat heart shadow size normal. Two-dimensional echocardiography suggests mitral valve prolapse. Electrocardiogram shown in Figure 1. Clinical diagnosis: mitral valve prolapse. ECG analysis: for the lead II record, sinus P wave frequency of 110 times, the same lead can be seen in three before the beat appears, the second premature beat more broad, T wave and the main wave in the opposite direction, can be judged as ventricular Premature beat. The first 1,3 pre-stroke with P wave, P-R> 0.12 seconds, the shape mediated