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Plasma renin and risk of cardiovascular disease and mortality: the Framingham Heart Study
Nisha I Parikh1, Philimon Gona, Martin G Larson
1Framingham Heart Study, Boston University School of Medicine, 73 Mount Wayte Avenue, Suite 2, Framingham, MA 01702-5803, USA.
Insights
Higher plasma renin levels are linked to increased short-term mortality risk, particularly in hypertensive individuals. This study found no association between plasma renin and the incidence of cardiovascular disease (CVD) in the community.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Epidemiology
Background:
- Conflicting previous study results highlight the need for further investigation into the relationship between plasma renin and cardiovascular outcomes.
- The renin-angiotensin-aldosterone system plays a crucial role in blood pressure regulation and cardiovascular homeostasis.
Purpose of the Study:
- To investigate the association between plasma renin levels and the incidence of cardiovascular disease (CVD) and all-cause mortality.
- To examine these associations in a general population sample and a subset of hypertensive individuals.
Main Methods:
- A cohort study involving 3408 participants (mean age 59 years, 53% women) with a hypertensive subset of 1413 individuals.
- Plasma renin levels were measured, and participants were followed for a mean of 7.1 years for CVD incidence and mortality.
- Multivariable-adjusted hazard ratios (HR) were calculated to assess the relationship between log-renin and outcomes, with time-dependent analyses performed.
Main Results:
- Overall, higher plasma renin was significantly associated with increased mortality risk (HR per SD increment: 1.14 in the whole sample, 1.16 in hypertensives).
- This association was primarily driven by short-term mortality, with significant links observed at 2.5 years but not at 5 years of follow-up.
- No significant association was found between plasma renin levels and the incidence of cardiovascular disease in either the general population or the hypertensive subset.
Conclusions:
- Elevated plasma renin is associated with increased short-term mortality risk, especially in hypertensive individuals.
- Plasma renin levels do not appear to be a significant predictor of cardiovascular disease incidence in the community.
- Further research may be warranted to elucidate the mechanisms underlying the short-term mortality risk associated with higher plasma renin.
Aims:
Previous studies relating plasma renin to cardiovascular disease (CVD) and mortality yielded conflicting results. We related plasma renin to incidence of CVD and mortality in 3408 individuals (mean age 59; 53% women) and in a hypertensive subset (n = 1413).
Methods And Results:
On follow-up (mean 7.1 years), 176 participants (122 hypertensives) developed CVD and 215 individuals (127 hypertensives) died. Overall, log-renin was associated with mortality [multivariable-adjusted hazards ratio (HR) per SD increment: in whole sample, 1.14, 95% confidence interval (CI) 1.00-1.30, P = 0.046; hypertensives, 1.16, 95% CI 1.00-1.35, P = 0.046], but relations varied over time (P < 0.02). Log-renin was associated with mortality at 2.5 years of follow-up (HR per SD increment: whole sample at 2.5 years, 1.23, 95% CI 1.04-1.45; hypertensives at 2 years, 1.28, 95% CI 1.06-1.54), but not during longer follow-up (HR per SD increment at 5 years: whole sample, 1.02, 95% CI 0.80-1.29; hypertensives, 0.98, 95% CI 0.74-1.30). The time-dependent relation of renin and mortality risk was maintained upon excluding participants with prevalent CVD. Renin was not associated with CVD incidence (HR per SD increment log-renin: whole sample, 0.99, 95% CI 0.85-1.14; hypertensives, 0.96, 95% CI 0.82-1.12).
Conclusion:
Higher plasma renin was associated with greater short-term mortality but not with CVD incidence in the community.
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