Why the study?
Does body surface potential mapping (Q30 in upper V1/V2 and right chest leads) improve the detection of left anterior wall asynergy in CAD patients without abnormal Q waves on standard 12-lead ECG?
Does body surface potential mapping (Q30 in upper V1/V2 and right chest leads) improve the detection of left anterior wall asynergy in CAD patients without abnormal Q waves on standard 12-lead ECG?
Adding upper V1/V2 and right chest leads to standard 12-lead ECG improves the diagnostic accuracy for detecting anterior wall contraction abnormalities in CAD patients.
May support adjunctive upper leads for anterior asynergy detection in CAD; hypothesis-generating, requires prospective validation before practice change.
標準12誘導心電図による心筋梗塞の診断が困難であるが,心血管造影にて,左室前壁に限局する収縮異常を示した冠動脈疾患患者48名(疾患群)を対象とし,体表面電位図を記録し,各誘導点のQ30(Q波≧30msec)の出現率を健常群57名のそれと比較した.疾患群ではV1・V2誘導点の上方領域および右胸部でQ30の出現率が有意に高かつた. Q30による感度は17～56%であつたが,陽性予測率は63～92%と高かつた.収縮異常高度群は軽度群に比べ,同様の領域でQ30の出現率が高かつた.これらの結果から,標準12誘導心電図誘導にV1・V2誘導点の上方領域および右胸部の誘導を加えることにより前壁収縮異常の心電図診断の精度が向上すると考えられた.
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Yabe et al. (1986) studied this question.
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