@article {795, title = {Moderate renal impairment and risk of dementia among older adults: the Cardiovascular Health Cognition Study.}, journal = {J Am Soc Nephrol}, volume = {15}, year = {2004}, month = {2004 Jul}, pages = {1904-11}, abstract = {

Renal impairment is associated with an increased risk of carotid atherosclerosis and stroke, determinants of cognitive dysfunction and dementia. The purpose of this study was to determine whether moderate renal impairment is associated with incident dementia among community-dwelling older adults. Participants in the Cardiovascular Health Cognition Study without prevalent dementia (n = 3349) were included in the analysis. Incident dementia was confirmed through neurologic testing. Renal function at baseline was estimated by the inverse of serum creatinine (1/SCr); moderate renal impairment was defined as SCr > or = 1.3 mg/dl for women and > or = 1.5 mg/dl for men. Cox regression models were used to estimate the association of renal impairment with incident dementia. Because SCr is also a function of muscle mass, the authors determined whether the relationship between SCr and dementia was particularly strong among individuals without severe co-morbidity at baseline, as reflected by self-reported general health status. There were 477 incident dementia cases over a median 6 yr follow-up. After adjustment for potential confounders, moderate renal insufficiency was associated with a 37\% increased risk of dementia (95\% CI = 1.06 to 1.78). Similarly, a 0.5-unit decrement in 1/SCr (equivalent to an increase in SCr from 1.0 to 2.0 mg/dl) was associated with a 26\% increased risk (95\% CI = 1.02 to 1.60). These associations were present only among the 84\% of older adults who reported good-excellent health. Among those in good-excellent health, higher SCr was associated with vascular-type dementia but not Alzheimer-type dementia. Moderate renal impairment, reflected by a higher SCr, is associated with an excess risk of incident dementia among individuals in good-excellent health. Strategies to prevent or delay the onset of dementia in patients with moderate renal impairment are needed.

}, keywords = {Aged, Alzheimer Disease, Cardiovascular Diseases, Creatinine, Dementia, Dementia, Vascular, Female, Humans, Kidney, Kidney Diseases, Male, Muscles, Proportional Hazards Models}, issn = {1046-6673}, doi = {10.1097/01.asn.0000131529.60019.fa}, author = {Seliger, Stephen L and Siscovick, David S and Stehman-Breen, Catherine O and Gillen, Daniel L and Fitzpatrick, Annette and Bleyer, Anthony and Kuller, Lew H} } @article {873, title = {Cystatin C and incident peripheral arterial disease events in the elderly: results from the Cardiovascular Health Study.}, journal = {Arch Intern Med}, volume = {165}, year = {2005}, month = {2005 Dec 12-26}, pages = {2666-70}, abstract = {

BACKGROUND: The association of cystatin C, a novel marker of renal function, with risk for developing complications related to peripheral arterial disease (PAD) has not been examined.

METHODS: We evaluated the hypothesis that a high cystatin C concentration is independently associated with future PAD events among 4025 participants in the Cardiovascular Health Study who underwent serum cystatin C measurement at the 1992-1993 visit and who did not have PAD at baseline. The association of cystatin C quintiles with time to first lower-extremity PAD procedure (bypass surgery, angioplasty, or amputation) was evaluated using multivariable proportional hazards models. Secondary analyses were conducted using quintiles of serum creatinine level and estimated glomerular filtration rate (eGFR).

RESULTS: The annualized risk of undergoing a procedure for PAD was 0.43\% per year among participants in the highest cystatin C quintile (>1.27 mg/L) compared with 0.21\% per year or less in all other quintiles. After multivariable adjustment for known risk factors for PAD, elevated cystatin C levels remained associated with the outcome (hazard ratio, 2.5 for highest vs lowest quintile of cystatin C, 95\% confidence interval, 1.2-5.1). The highest quintiles of serum creatinine level and eGFR were not associated with future PAD events in either unadjusted or adjusted analyses.

CONCLUSION: Elevated concentrations of cystatin C were independently predictive of incident PAD events among community-dwelling elderly patients.

}, keywords = {Aged, Cohort Studies, Cystatin C, Cystatins, Female, Health Surveys, Humans, Longitudinal Studies, Male, Peripheral Vascular Diseases, Predictive Value of Tests, Risk Factors, ROC Curve, United States}, issn = {0003-9926}, doi = {10.1001/archinte.165.22.2666}, author = {O{\textquoteright}Hare, Ann M and Newman, Anne B and Katz, Ronit and Fried, Linda F and Stehman-Breen, Catherine O and Seliger, Stephen L and Siscovick, David S and Shlipak, Michael G} } @article {862, title = {Cystatin C and subclinical brain infarction.}, journal = {J Am Soc Nephrol}, volume = {16}, year = {2005}, month = {2005 Dec}, pages = {3721-7}, abstract = {

Subclinical brain infarcts (SBI) are common in the elderly and are associated with covert neurologic and cognitive impairment. Although renal impairment is associated with accelerated cerebrovascular disease and an increased risk for clinically apparent brain infarct, few studies have examined the relationship between renal function and SBI, and these may have been limited by the inaccuracy of creatinine as a renal function marker. A cross-sectional study was performed among older adults in the Cardiovascular Health Study to examine associations between SBI and two serum markers of renal function: Serum creatinine (SCr) and cystatin C (CysC). Patients had cranial magnetic resonance imaging and renal markers measured in 1992 to 1993. Logistic regression was used to estimate the associations between renal function (estimated by 1/SCr and 1/CysC) and SBI, controlling for potential confounding factors. SBI were present in 789 (28.7\%) of 2784 participants. A linear association with SBI was observed for 1/CysC (per 1-SD decrement; odds ratio [OR] 1.20; 95\% confidence interval [CI] 1.09 to 1.32; P < 0.001) but not for 1/SCr (OR 1.08; 95\% CI 0.98 to 1.19; P = 0.14), for which a quadratic U-shaped association was suggested (P = 0.004). In a model with both markers, 1/CysC was linearly associated with SBI (OR 1.26; P < 0.001), whereas 1/SCr was not (OR 1.06; P = 0.3). The prevalence of SBI was directly associated with quintile of CysC, whereas the association between SCr and SBI was U-shaped, with greater prevalence at high and low levels. Compared with creatinine, CysC, a novel marker of renal function, has a stronger and more direct association with SBI in the elderly.

}, keywords = {Age Factors, Aged, Aged, 80 and over, Biomarkers, Brain Infarction, Confidence Intervals, Creatinine, Cross-Sectional Studies, Cystatin C, Cystatins, Disease Progression, Female, Geriatric Assessment, Humans, Incidence, Ischemic Attack, Transient, Magnetic Resonance Imaging, Male, Odds Ratio, Predictive Value of Tests, Prognosis, Risk Assessment, Sensitivity and Specificity, Severity of Illness Index, Sex Factors, Survival Analysis}, issn = {1046-6673}, doi = {10.1681/ASN.2005010006}, author = {Seliger, Stephen L and Longstreth, W T and Katz, Ronit and Manolio, Teri and Fried, Linda F and Shlipak, Michael and Stehman-Breen, Catherine O and Newman, Anne and Sarnak, Mark and Gillen, Daniel L and Bleyer, Anthony and Siscovick, David S} } @article {827, title = {Cystatin C concentration as a risk factor for heart failure in older adults.}, journal = {Ann Intern Med}, volume = {142}, year = {2005}, month = {2005 Apr 05}, pages = {497-505}, abstract = {

BACKGROUND: Previous studies that evaluated the association of kidney function with incident heart failure may be limited by the insensitivity of serum creatinine concentration for detecting abnormal kidney function.

OBJECTIVE: To compare serum concentrations of cystatin C (a novel marker of kidney function) and creatinine as predictors of incident heart failure.

DESIGN: Observational study based on measurement of serum cystatin C from frozen sera obtained at the 1992-1993 visit of the Cardiovascular Health Study. Follow-up occurred every 6 months.

SETTING: Adults 65 years of age or older from 4 communities in the United States.

PARTICIPANTS: 4384 persons without previous heart failure who had measurements of serum cystatin C and serum creatinine.

MEASUREMENTS: Incident heart failure.

RESULTS: The mean (+/-SD) serum concentrations of cystatin C and creatinine were 82 +/- 25 nmol/L (1.10 +/- 0.33 mg/L) and 89 +/- 34 micromol/L (1.01 +/- 0.39 mg/dL), respectively. During a median follow-up of 8.3 years (maximum, 9.1 years), 763 (17\%) participants developed heart failure. After adjustment for demographic factors, traditional and novel cardiovascular risk factors, cardiovascular disease status, and medication use, sequential quintiles of cystatin C concentration were associated with a stepwise increased risk for heart failure in Cox proportional hazards models (hazard ratios, 1.0 [reference], 1.30 [95\% CI, 0.96 to 1.75], 1.44 [CI, 1.07 to 1.94], 1.58 [CI, 1.18 to 2.12], and 2.16 [CI, 1.61 to 2.91]). In contrast, quintiles of serum creatinine concentration were not associated with risk for heart failure in adjusted analysis (hazard ratios, 1.0 [reference], 0.77 [CI, 0.59 to 1.01], 0.85 [CI, 0.64 to 1.13], 0.97 [CI, 0.72 to 1.29], and 1.14 [CI, 0.87 to 1.49]).

LIMITATIONS: The mechanism by which cystatin C concentration predicts risk for heart failure remains unclear.

CONCLUSIONS: The cystatin C concentration is an independent risk factor for heart failure in older adults and appears to provide a better measure of risk assessment than the serum creatinine concentration. *For a full list of participating Cardiovascular Health Study investigators and institutions, see http://www.chs-nhlbi.org.

}, keywords = {Aged, Biomarkers, Creatinine, Cystatin C, Cystatins, Female, Follow-Up Studies, Glomerular Filtration Rate, Heart Failure, Humans, Incidence, Kidney, Kidney Function Tests, Male, Risk Factors, United States}, issn = {1539-3704}, doi = {10.7326/0003-4819-142-7-200504050-00008}, author = {Sarnak, Mark J and Katz, Ronit and Stehman-Breen, Catherine O and Fried, Linda F and Jenny, Nancy Swords and Psaty, Bruce M and Newman, Anne B and Siscovick, David and Shlipak, Michael G} } @article {1015, title = {Cardiovascular risk factors and incident acute renal failure in older adults: the cardiovascular health study.}, journal = {Clin J Am Soc Nephrol}, volume = {3}, year = {2008}, month = {2008 Mar}, pages = {450-6}, abstract = {

BACKGROUND AND OBJECTIVES: Although the elderly are at increased risk for acute renal failure, few prospective studies have identified risk factors for acute renal failure in the elderly.

DESIGN, SETTING, PARTICIPANTS, \& MEASUREMENTS: The associations of cardiovascular disease risk factors, subclinical cardiovascular disease, and clinical coronary heart disease with the risk for development of acute renal failure were examined in older adults in the Cardiovascular Health Study, a prospective cohort study of community-dwelling older adults. Incident hospitalized cases of acute renal failure were identified through hospital discharge International Classification of Diseases, Ninth Revision codes and confirmed through physician diagnoses of acute renal failure in discharge summaries.

RESULTS: Acute renal failure developed in 225 (3.9\%) of the 5731 patients during a median follow-up period of 10.2 yr. In multivariate analyses, diabetes, current smoking, hypertension, C-reactive protein, and fibrinogen were associated with acute renal failure. Prevalent coronary heart disease was associated with incident acute renal failure, and among patients without prevalent coronary heart disease, subclinical vascular disease measures were also associated with acute renal failure: Low ankle-arm index (< or =0.9), common carotid intima-media thickness, and internal carotid intima-media thickness.

CONCLUSIONS: In this large, population-based, prospective cohort study, cardiovascular risk factors and both subclinical and clinical vascular disease were associated with incident acute renal failure in the elderly.

}, keywords = {Acute Kidney Injury, Aged, Cardiovascular Diseases, Female, Follow-Up Studies, Humans, Male, Prospective Studies, Risk Factors}, issn = {1555-905X}, doi = {10.2215/CJN.02610607}, author = {Mittalhenkle, Anuja and Stehman-Breen, Catherine O and Shlipak, Michael G and Fried, Linda F and Katz, Ronit and Young, Bessie A and Seliger, Stephen and Gillen, Daniel and Newman, Anne B and Psaty, Bruce M and Siscovick, David} }