Key result
Hypokalemia was associated with significantly greater QT dispersion compared to normal controls (115 ± 31 vs. 49 ± 15 ms, P < 0.05), whereas other electrolyte abnormalities were not.
Why the study?
Do specific electrolyte abnormalities increase the dispersion of ventricular repolarization times on 12-lead ECG?
Population
60 patients with isolated electrolyte abnormalities, plus an experimental substudy of 14 rats.
Comparison
Presence of isolated electrolyte abnormalities… vs Normal controls and normal diet.
Design
Cross-sectional
Authors
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May support targeted ECG assessment in hypokalemia; leaves open whether other electrolytes influence repolarization in broader populations.
Observational (n=60)
Do specific electrolyte abnormalities increase the dispersion of ventricular repolarization times on 12-lead ECG?
Absolute Event Rate: 115% vs 49%
p-value: p=< 0.05
Hypokalemia, but not other common electrolyte abnormalities, significantly increases the dispersion of ventricular repolarization, which may explain its specific association with ventricular arrhythmias.
Yelamanchi et al. (2001) conducted an observational in Isolated electrolyte abnormalities (n=60). Hypokalemia vs. Normal controls was evaluated on QT dispersion (QTd) (p=< 0.05). Hypokalemia was associated with significantly greater QT dispersion compared to normal controls (115 ± 31 vs. 49 ± 15 ms, P < 0.05), whereas other electrolyte abnormalities were not.
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