In order to compare the position of accessory pathways to the surface ECG parameters in patients with Wolff-Parkinson-White (WPW) syndrome, a study had been ca"ied out on 135 patients with a typical WPW syndrome at Vietnam Heart Institute, Bach Mai Hospital. The surface EGG parameters were compared with the position of accessory pathways identified as described above and radio frequency (RF) treatment. The authors found that PR interval in the left group was 112.6 + or - 11.5 ms. It was longer than that in the right group (102.4 + or - 15.8 ms) (p 0.05). A similar result was observed with QRS duration. QRS duration was 134.1 + or - 16.7 ms in the left group vs. 146.9 :i: 23.6 ms in the right group (p 0.05). Negative delta wave in V1 found in 90.76 percent cases of the right group, while positive delta wave in V1 found in 97.14 percent cases of the' left group. The positive delta waves in at least 2/3 inferior leads of the common in the anterior accessory pathway of the atrioventricular vales occu"ed in 79.7 percent of cases, while the negative delta waves in at least 2/3 inferior leads of the common in the posterior accessory pathway of the atrioventricular valve accounted for 93.94 percent of cases. For the right sub-pathways (negative delta wave in V1): the transition of the QRS complex in V1, V2 met in 92.5 percent of the septal accessory pathways, while the QRS transition after V2 leads found in 92.2 percent of the free wall accessory pathways. Therefore, the surface ECG parameters in typical WPW syndrome closely related to accessory pathways position during cardiac electrophysiological testing and can be used to predict the location accessory pathways.
- Đăng nhập để gửi ý kiến