Key result
Overt hypothyroidism was associated with higher QT dispersion and lower HRV compared to euthyroid controls (P<0.01), with HRV normalizing and QT dispersion partially improving after L-T4 treatment.
Why the study?
Does L-T4 treatment improve heart rate variability and QT dispersion in patients with overt hypothyroidism?
Population
31 patients with overt hypothyroidism and 31 euthyroid controls.
Comparison
L-T4 treatment for 6 months vs Euthyroid controls and baseline pre-treatment…
Design
Cohort
Follow-up
6 months
Authors
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L-T4 may normalize HRV in overt hypothyroidism; leaves open effects on arrhythmic risk.
Observational (n=62)
Does L-T4 treatment improve heart rate variability and QT dispersion in patients with overt hypothyroidism?
p-value: p=<0.01
Overt hypothyroidism impairs cardiovascular autonomic function and ventricular repolarization, which can be improved with L-T4 replacement therapy.
Galetta et al. (2008) conducted an observational in Overt hypothyroidism (n=62). Overt hypothyroidism vs. Euthyroid controls was evaluated on QT dispersion and heart rate variability (p=<0.01). Overt hypothyroidism was associated with higher QT dispersion and lower HRV compared to euthyroid controls (P<0.01), with HRV normalizing and QT dispersion partially improving after L-T4 treatment.
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