Low serum magnesium concentrations predict cardiovascular and all-cause mortality

Area of Science:

• Cardiovascular Epidemiology
• Clinical Biochemistry
• Public Health Research

Background:

• Low serum magnesium (Mg++) is linked to left ventricular hypertrophy, independent of traditional cardiovascular risk factors.
• Left ventricular hypertrophy carries significant prognostic implications for cardiovascular health.
• Previous research in the Study of Health in Pomerania (SHIP) indicated a link between low Mg++ and future left ventricular hypertrophy.

Purpose of the Study:

• To investigate the association between serum magnesium (Mg++) levels and cardiovascular mortality.
• To determine if hypomagnesemia predicts long-term mortality risk.

Main Methods:

• A Cox proportional hazard model was used to analyze mortality in relation to baseline serum Mg++ concentrations.
• The Study of Health in Pomerania (SHIP) cohort (n=4203) was analyzed, excluding subjects on Mg++ supplementation.
• Mortality follow-up was conducted over a median of 10.1 years, accumulating 38,075 person-years.

Main Results:

• Subjects with serum Mg++ ≤0.73 mmol/l exhibited significantly higher all-cause mortality (10.95 vs. 1.45 deaths/1000 person-years) and cardiovascular mortality (3.44 vs. 1.53 deaths/1000 person-years).
• These associations remained statistically significant after adjusting for multiple cardiovascular risk factors, including hypertension and diuretic use.
• Log-rank tests confirmed the significance: p=0.0001 for all-cause mortality and p=0.0174 for cardiovascular mortality.

Conclusions:

• Low serum magnesium (Mg++) levels are significantly associated with increased all-cause and cardiovascular mortality.
• These findings support the hypothesis that hypomagnesemia is a predictor of mortality.
• The results align with previous observations linking hypomagnesemia to increased left ventricular mass over time.