Cokkinos D V, Christoulas S, Trapalis C, Ioannou N, Diakoumakos N, Drakotos A, Edelman S K
Department of Cardiology, Tzanio Hospital, Pireus Greece.
Acta Cardiol. 1988;43(5):583-94.
We measured the systolic time intervals (STI) in 14 patients (pts) with intermittent left bundle branch block (LBBB) in order to find correlations and comparisons in their values which might pertain to the individual patients, with (b) and without (a) LBBB. QS2I, PEP and the PEP/LVET ratio increased significantly (b) while the LVET I did not change. STI correlation was significant and improved further when the QS2 (b) was corrected by subtracting from it the QRS prolongation (b) in msec. All 7 pts with a PEP/LVET ratio (b) greater than 0.65 had an (a) ratio greater than 0.42 (normal limits for our laboratory), sensitivity 100%. Six of 7 patients with a PEP/LVET (b) less than 0.65 had an (a) ratio less than 0.42 (specificity 87.5%). For the individual patient with LBBB his STI can be quite accurately assessed by subtracting from his QS2 (b) the prolongation of the QRS (b) greater than 80 msec the length of the normal QRS duration. The above data were prospectively evaluated in 10 pts to whom intermittent right ventricular pacing was applied. We found that the correction of the QS2 interval for QRS prolongation permitted a very reliable calculation of the STI.
我们测量了14例间歇性左束支传导阻滞（LBBB）患者的收缩期时间间期（STI），以便找出其数值与个体患者在有（b）和无（a）LBBB情况下的相关性及比较结果。QS2I、PEP和PEP/LVET比值显著升高（b），而LVET I未改变。当从QS2（b）中减去以毫秒为单位的QRS延长时间（b）对QS2（b）进行校正后，STI相关性显著且进一步改善。所有7例PEP/LVET比值（b）大于0.65的患者，其（a）比值均大于0.42（我们实验室的正常范围），敏感性为100%。7例PEP/LVET（b）小于0.65的患者中有6例其（a）比值小于0.42（特异性为87.5%）。对于患有LBBB的个体患者，通过从其QS2（b）中减去大于80毫秒的QRS延长时间（b）（即正常QRS持续时间的长度），可以相当准确地评估其STI。上述数据在10例接受间歇性右心室起搏的患者中进行了前瞻性评估。我们发现，对QS2间期进行QRS延长校正后，可以非常可靠地计算STI。
