T loop in posterior myocardial infarction: A useful clue to vectorcardiographic diagnosis

Takatsu, Fumimaro; Osugi, Junichi; Nagaya, Teruo; Uwatoko, Masashi; Watabe, Shinji; Ishikawa, Hiroyasu

doi:10.1016/s0022-0736(86)80017-6

Cited by 3 publications

(1 citation statement)

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“…The contribution of the T loop characteristics and of the abnormal QRS-T angle to the diagnosis of MI has been demonstrated previously. 25,26 The similar spatial T amplitude and spatial QRS-T angle found between patients with recent and those with old MI indicate that the spatial repolarization characteristics are similar between the two post-MI groups. It has already been shown that the infarcted area is electrically inert and distorts the normal spread of excitation.…”

Section: Spatial Aspects Of Ventricular Repolarization In Postinfarctmentioning

confidence: 78%

Spatial Aspects of Ventricular Repolarization in Postinfarction Patients

Dilaveris

Gialafos

Pantazis

et al. 2001

Pacing Clinical Electrophis

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QT dispersion has been proposed to reflect the heterogeneity of ventricular repolarization, but a poor reproducibility limits its clinical usefulness. Spatial vectorcardiographic descriptors constitute a novel approach to quantify ventricular repolarization. To test the ability of vectorcardiographic descriptors to discriminate among different subsets of postinfarction patients, 50 consecutively recruited patients with acute MI, 50 patients with history of an old (> 6 months) MI, and 50 healthy controls were evaluated. The maximum and minimum QT and JT intervals and QT and JT dispersion were manually measured from a digitally recorded 12-lead ECG. X, Y, and Z leads were reconstructed from the 12-lead ECG. The amplitude of the maximum spatial T vector (spatial T amplitude), the angle between the maximum spatial QRS and T vectors (spatial QRS-T angle), and the frontal plane QRS-T angle were automatically calculated. The spatial T amplitude and the spatial QRS-T angle did not differ between patients with a recent and those with an old MI (P = 1). QT dispersion was significantly lower in patients with an old MI than in patients with a recent one (P = 0.002). The spatial repolarization descriptors showed better short-term reproducibility than the dispersion indices. In conclusion, the spatial T amplitude and the spatial QRS-T angle are accurate measures of ventricular repolarization that do not differ between patients with recent and those with old MI. The different QT dispersion values observed in this study between the two post-MI groups should be considered cautiously because of the low accuracy of the manual measurements.

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Section: Spatial Aspects Of Ventricular Repolarization In Postinfarctmentioning

confidence: 78%