Adjustment of QT dispersion assessed from 12 lead electrocardiograms for different numbers of analysed electrocardiographic leads: comparison of stability of different methods.
Population
27 healthy people with resting 12-lead electrocardiograms
Comparison
Evaluation of QT dispersion using different… vs 'True' QT dispersion assessed from all…
Design
Other
Authors
Discussion
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Member takes
Implication
QT dispersion should use fixed lead sets rather than adjustment formulas; this leaves open validation of optimal methods in prospective ECG studies.
Structured PICO
P
Population
27 healthy people with resting 12-lead electrocardiograms
I
Intervention
Evaluation of QT dispersion using different formulas (max-min, second max-min, SD, weighted SD) and adjustment for missing leads
C
Comparator
'True' QT dispersion assessed from all measurable leads
O
Outcome
Mean relative differences (errors) and coefficients of variance between QT dispersion with omitted leads and 'true' QT dispersionsurrogate
Adjusting QT dispersion for missing leads is highly variable, suggesting QT dispersion should be assessed from standardized constant sets of ECG leads rather than adjusted.
Cite This Study
Hnatkova et al. (1994) studied this question.