Suzuki Y, Terada H, Yamazaki N
Jpn Heart J. 1983 May;24(3):457-62. doi: 10.1536/ihj.24.457.
This report documents a case which showed type A, type B and intermediate patterns of pre-excitation on different days. A vagotonic maneuver and digitalis induced a type A pattern, while exercise, atropine and isoproterenol caused a type B pattern of activity. A gradual transition from type A to B was demonstrated with vectorcardiograms. Despite the variations in the QRS morphology, the direction of the initial vector was not altered and was directed straight anteriorly. In this case, an accessory pathway may be located in the posterior paraseptal region or the lateral free wall of the left ventricle, and a variable size of pre-excited area may have caused type A and type B patterns of pre-excitation.
本报告记录了一个病例，该病例在不同日期显示出A型、B型和中间型预激模式。迷走神经刺激动作和洋地黄可诱发A型模式，而运动、阿托品和异丙肾上腺素则导致B型活动模式。向量心电图显示了从A型到B型的逐渐转变。尽管QRS形态存在变化，但初始向量的方向未改变，且直接指向正前方。在该病例中，旁路可能位于后间隔区域或左心室游离壁，预激区域大小的变化可能导致了A型和B型预激模式。
