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Detection of posterior myocardial infarction by body surface mapping: A comparative study with 12 lead ECG and VCG
Authors:M.D. Kozue Ikeda   M.D. Isao Kubota   M.D. Ichiro Tonooka   M.D. Kai Tsuiki  M.D. Shoji Yasui
Abstract:
To examine the diagnostic ability of body surface mapping in posterior myocardial infarction (PMI), mapping was performed in 11 patients with PMI proven by left ventriculography and T1-201 myocardial perfusion imaging (PMI group) and in 44 normal subjects (N group). Map data was analysed by the following methods: (1) potential departure maps at 10, 20, 30, 40 and 50 msec after the onset of QRS; each map indicates the area of decreased potential out of the normal range at the time. (2) AQRS departure map which indicates the area of decreased time-integral value of QRS out of the normal range. True positive (TP) in the PMI group and false positive (FP) in the N group were calculated for each method, and were compared with those of various criteria for PMI with standard 12-lead electrocardiogram (ECG) and Frank lead vectorcardiogram (VCG). The potential departure maps and the AQRS departure map had high TP (10/11 and 8/11) and low FP (0/44 and 0/44). The diagnostic ability of mapping is considered to be higher than that of ECG and VCG. Mapping, especially the departure map technique, is a sensitive and specific method to detect posterior infarction.
Keywords:Reprint requests to: Kozue Ikeda   M.D.   The First Department of Internal Medicine   Yamagata University School of Medicine   Zao-Iida   Yamagata 990-23   Japan.
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