25 May 2020
This publication from the WHI project was based on data from the observational study cohort and the control arm of the hormone therapy clinical trial . The primary analysis included participants who completed baseline physical examination, demographic, medical history, and self-reported dietary questionnaires, out of which a calculation of the daily magnesium intake was made. The primary outcome was incident hospitalization for heart failure (HF), which was ascertained yearly by medical record abstraction of all self-report hospitalizations. The cohort consisted of 97725 postmenopausal women 50-79 years old, of whom 2153 HF cases were observed over a median follow-up of 8.1 years. The median dietary magnesium intake across quartiles were 149 mg/day for women in the lowest quartile (Q4), 363 mg/day for the highest quartile (Q1) of intake. The non-adjusted Hazard Ratio (HR) of incident hospitalized HF for Q4 was 1.20 (1.06–1.36), compared to the value for Q1, which served as the reference. The corresponding adjusted HR was 1.32 (1.02–1.71). While many parameters and variables were considered and analyzed, the final conclusion was simple “low magnesium intake in a multiracial cohort of postmenopausal women was associated with a higher risk of incident HF, especially HF with reduced ejection fraction”.