Possible causes of prominent anterior forces
Zhu, J.R.; Yao, Z.Y.
Zhonghua Xin Xue Guan Bing Za Zhi 10(2): 104-108
1982
ISSN/ISBN: 0253-3758 PMID: 6215239 Document Number: 191978
Prominent anterior forces (PAF), characterized by anterior shift of the QRS loop, are often encountered in right ventricular hypertrophy (RVH), right bundle branch block (RBBB), type A WPW criteria was as follows: maximal vector of horizontal QRS loop directed anteriorly > +45.degree.; or maximal vector of horizontal QRS loop directed anteriorly > +30.degree. and 2/3 or more of the loop area located anteriorly. To identify the various causes of PAF, VCG and ECG data of 120 normal individuals of different age groups and 2000 consecutive patients (including 153 cases of RVH, 226 cases of RBBB, 52 cases of A WPW, 417 cases of myocardial infarction, 45 cases of HCM, and 60 additional cases with the VCG criteria of PAF) were analyzed. RBBB and A WPW are readily recognized by VCG and ECG. When the horizontal QRS loop rotates in a counterclockwise direction with maximal vector anterior to +45.degree., or anterior to +30.degree. and 2/3 or more of the loop area located anteriorly, and QRS duration of < 100 ms, left septal fascicular block may be suspected.