Key result
Temporal parameters from ECG limb leads highly correlated (r > 0.8 to r > 0.9) with unipolar leads over specific body surface areas in normal subjects.
Why the study?
Do temporal parameters from ECG limb leads correlate with measurements from specific areas in body surface mapping in normal subjects?
Cross-Sectional (n=50)
Do temporal parameters from ECG limb leads correlate with measurements from specific areas in body surface mapping in normal subjects?
Temporal parameters from ECG limb leads strongly correlate with specific body surface areas, suggesting they provide localized information on ventricular activation and repolarization.
Limb-lead temporal parameters may reflect localized ventricular activation in normals; leaves open validation in disease and clinical utility.
AIMS: Dispersion of ventricular depolarization-repolarization in 12-lead electrocardiograms (ECGs) has been reported to provide noninvasive information on arrhythmogenicity. However, there are two methods to calculate the dispersion from ECGs including and excluding limb leads. The aim of this study was to examine whether temporal parameters from limb leads represent activation and repolarization of a particular part of the body surface. METHODS AND RESULTS: We compared the temporal parameters of activation time (AT), activation-recovery interval (ARI), and recovery time (RT) from limb leads of ECGs with those from an 87-lead body surface maps. The study population consisted of 50 normal subjects (25 men and 25 women, 19.4 +/- 1.6 years). The temporal parameters in leads I, II, and III were highly (r > 0.9) correlated with those in unipolar leads over the left lateral, left lower, and right lower chest, respectively. The temporal parameters in leads aVR, aVL, and aVF showed a significant correlation (r > 0.8) with those in unipolar leads over the right upper, left upper, and lower anterior chest, respectively. The mean AT, ARI, and RT from each limb lead of ECG were almost the same as those of unipolar leads over the corresponding areas of the body surface. CONCLUSIONS: These findings suggest that ATs, ARIs, and RTs from limb leads may represent those from unipolar leads of particular areas over the body surface in normal subjects. The temporal parameters from limb leads of ECGs may provide information on activation and repolarization as well as the precordial leads of ECGs.
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Takahisa Sawada (2002) conducted a cross-sectional in Normal subjects (n=50). Temporal parameters from limb leads of ECGs vs. Temporal parameters from 87-lead body surface maps was evaluated on Correlation of temporal parameters (activation time, activation-recovery interval, and recovery time) between limb leads and unipolar leads over specific chest areas (r > 0.9 for leads I, II, III; r > 0.8 for leads aVR, aVL, aVF). Temporal parameters from ECG limb leads highly correlated (r > 0.8 to r > 0.9) with unipolar leads over specific body surface areas in normal subjects.
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