Association of kidney function and albuminuria with cardiovascular mortality in older vs younger individuals: The HUNT II Study - PubMed (original) (raw)
Association of kidney function and albuminuria with cardiovascular mortality in older vs younger individuals: The HUNT II Study
Stein Hallan et al. Arch Intern Med. 2007.
Abstract
Background: The cardiovascular risk implications of a combined assessment of reduced kidney function and microalbuminuria are unknown. In elderly persons, traditional cardiovascular risk factors are less predictive, and measures of end organ damage, such as kidney disease, may be needed for improved cardiovascular mortality risk stratification.
Methods: The glomerular filtration rate was estimated from calibrated serum creatinine, and the urine albumin-creatinine ratio (ACR) was measured in 3 urine samples in 9,709 participants of the second Nord-Trøndelag Health Study (HUNT II), a Norwegian community-based health study, followed for 8.3 years with a 71% participation rate.
Results: An estimated glomerular filtration rate (EGFR) at levels of less than 75 mL/min/1.73 m(2) was associated with higher cardiovascular mortality risk, whereas a higher ACR was associated with higher risk with no lower limit. Low EGFR and albuminuria were synergistic cardiovascular mortality risk factors. Compared with subjects with an EGFR greater than 75 mL/min/1.73 m(2) and ACR below the sex-specific median who were at the lowest risk, subjects with an EGFR of less than 45 mL/min/1.73 m(2) and microalbuminuria had an adjusted incidence rate ratio of 6.7 (95% confidence interval, 3.0-15.1; P < .001). The addition of ACR and EGFR improved traditional risk models: 39% of subjects with intermediate risk were reclassified to low- or high-risk categories with corresponding observed risks that were 3-fold different than the original category. Age-stratified analyses showed that EGFR and ACR were particularly strong risk factors for persons 70 years or older.
Conclusions: Reduced kidney function and microalbuminuria are risk factors for cardiovascular death, independent of each other and traditional risk factors. The combined variable improved cardiovascular risk stratification at all age levels, but particularly in elderly persons where the predictive power of traditional risk factors is attenuated.
Comment in
- Glomerular filtration rate less than 45 mL/min/1.73 m2 with microalbuminuria was associated with increased risk for CV death.
Rifkin DE, Sarnak MJ. Rifkin DE, et al. ACP J Club. 2008 May 20;148(3):14. ACP J Club. 2008. PMID: 18489077 No abstract available. - Glomerular filtration rate <45 ml/min/1.73 m2 with microalbuminuria was associated with increased CV death.
Rifkin DE, Sarnak MJ. Rifkin DE, et al. Evid Based Med. 2008 Jun;13(3):89. doi: 10.1136/ebm.13.3.89. Evid Based Med. 2008. PMID: 18515636 No abstract available.
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