Why the study?
Acquired long QT syndrome may represent an early manifestation of hypopituitarism contributing to increased cardiovascular mortality, but evidence has been limited to 16 published case reports.
In patients with hypothalamic-pituitary disorders, QTc prolongation is primarily driven by age and structural hypothalamic/parasellar lesions rather than hypopituitarism itself, especially when patients are on adequate hormone replacement.
May warrant QTc monitoring in older patients with non-adenoma expansive lesions; hypothesis-generating for risk stratification in hypothalamic-pituitary disease.
Background: Long QT syndrome (LQTS) is characterized by delayed myocardial repolarization, predisposing to malignant arrhythmias such as torsades de pointes, ventricular fibrillation, and cardiac arrest. Recent reports suggest that acquired LQTS (aLQTS) may represent an early manifestation of hypopituitarism, potentially contributing to its increased cardiovascular mortality, although evidence remains limited to 16 published case reports. Objective: The objective was to investigate the relationship between hypopituitarism and corrected QT (QTc) interval. Methods: We retrospectively analyzed data from 185 patients (121 males) with hypothalamic–pituitary disorders who underwent a 12-lead electrocardiogram between April 2023 and September 2024. Clinical characteristics, hormone replacement therapy, and same-day laboratory parameters (electrolytes, fT3, fT4, IGF-I, testosterone) were recorded. QTc was calculated using Bazett’s formula. Multivariate logistic regression identified predictors of QTc prolongation. Results: Age (OR 1.07–1.09, p = 0.02) was a significant predictor in 5 of 8 models. The presence of expansive lesions other than pituitary adenomas, craniopharyngiomas, and Rathke’s cleft cysts was also associated with QTc prolongation (OR 8.35–17.73, p < 0.05 and p = 0.03). Potassium (OR 0.14–0.17, p = 0.09) and albumin-corrected calcium levels (OR 0.0003, p = 0.06) showed consistent, though borderline, associations. Conclusions: Age and the presence of expansive lesions other than pituitary adenomas, craniopharyngiomas, and Rathke’s cleft cysts are the main predictors of QTc duration in patients with hypothalamic–pituitary disease. Electrolyte imbalances—particularly low potassium and albumin-corrected calcium—may further contribute. The influence of specific pituitary deficiencies remains uncertain, likely due to adequate replacement therapy in most patients.
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Gasco et al. (2025) studied this question.
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