Association Between HDL Cholesterol and QTc Interval: A Population-Based Epidemiological Study.

Area of Science:

• Cardiology
• Epidemiology
• Biochemistry

Background:

• Experimental studies indicate that elevated high-density lipoprotein cholesterol (HDL) shortens cardiac repolarization and the corrected QT (QTc) interval.
• The epidemiological relationship between HDL cholesterol and QTc duration, as well as the potential antiarrhythmic effects of HDL, remain largely unexplored.

Purpose of the Study:

• To investigate the association between HDL cholesterol levels and QTc interval duration in a general adult population.
• To explore the potential epidemiological link between HDL cholesterol and cardiac repolarization parameters.

Main Methods:

• A cross-sectional population-based study was conducted in the Italian-speaking part of Switzerland, including 1085 adult subjects.
• Electrocardiogram (ECG) recordings were used to measure QTc intervals (Bazett's and Framingham formulas).
• HDL cholesterol levels were categorized, and statistical analyses (linear and logistic regression, restricted cubic splines) were performed to assess associations.

Main Results:

• Higher HDL cholesterol levels (HDL-2 and HDL-3 categories) were significantly associated with shorter QTc_Baz and QTc_Fram durations in women, both in crude and adjusted models.
• In women, higher HDL cholesterol levels were also linked to a reduced risk of prolonged QTc intervals.
• A non-linear association between HDL cholesterol and QTc duration was confirmed by restricted cubic spline analysis.

Conclusions:

• The study identified an epidemiological association between higher HDL cholesterol levels and shorter QTc interval duration, particularly in women.
• These findings suggest a potential role for HDL cholesterol in modulating cardiac repolarization.
• Further prospective studies in diverse populations are warranted to establish causality and confirm these associations.