Wendy W. Brown

Early detection of kidney disease in community settings: the kidney early evaluation program (KEEP)

BACKGROUND Early identification of persons at risk for kidney disease provides an opportunity to prevent or delay its progression and decrease morbidity and mortality. Our hypothesis was that implementation of a targeted screening program in communities with high-risk populations would detect previously unidentified persons with or at high risk for chronic kidney disease (CKD) with a prevalence that exceeds that predicted for CKD in the general population. METHODS Persons with hypertension or diabetes or a first-order relative with hypertension, diabetes, or kidney disease were screened for kidney disease risk factors. Blood pressure, blood glucose level, serum creatinine level, hemoglobin level, microalbuminuria, hematuria, pyuria, body mass index, and estimated glomerular filtration rate (EGFR) were evaluated. RESULTS Six thousand seventy-one eligible persons were screened from August 2000 through December 2001: of these persons, 68% were women, 43% were African American, 36% were white, 10% were Hispanic, and 5% were Native American. Most reported high-school education or more (84%) and health insurance coverage (86%). Twenty-seven percent met the screening definitions for diabetes; 64%, for hypertension; 29%, for microalbuminuria; 8%, for anemia; 18%, for hematuria; 13%, for pyuria; 5%, for elevated serum creatinine level; 16%, for reduced EGFR; and 44%, for obesity. Among participants without a reported history of specified conditions, screening identified 82 participants (2%) with diabetes, 1,014 participants (35%) with hypertension, 277 participants (5%) with elevated serum creatinine levels, 839 participants (14%) with reduced EGFRs, and 1,712 participants (29%) with microalbuminuria. Thirty-five percent of participants with a history of diabetes had elevated serum glucose levels at screening (> or =180 mg/dL [10 mmol/L]), and 64% with a history of hypertension did not have blood pressure controlled to less than 140/90 mm Hg. Only 18% of participants with a history of diabetes and 31% with a reduced EGFR had blood pressure controlled to less than 130/80 mm Hg and less than 135/85 mm Hg, respectively. CONCLUSION Targeted screening is effective in identifying persons with previously unidentified or poorly controlled kidney disease risk factors, as well as persons with a moderately decreased EGFR.

Hypertension Awareness, Treatment, and Control in Chronic Kidney Disease

BACKGROUND Hypertension prevalence, awareness, treatment, and blood pressure control rates in the population with chronic kidney disease are limited. The objective of this study was to determine the state of blood pressure control in patients with chronic kidney disease. METHODS This is a cross-sectional analysis of data of participants with chronic kidney disease from the Kidney Early Evaluation Program. The Kidney Early Evaluation Program is a national-based health screening program for individuals at high risk for kidney disease conducted in 49 states and the District of Columbia. Of 55,220 adults with kidney disease, 10,813 completed information for demographic and medical characteristics used in the analysis. Predictors of blood pressure control were assessed using multiple logistic regression analysis. RESULTS Hypertension prevalence, awareness, and treatment proportions in the screened cohort were high (86.2%, 80.2%, and 70.0%, respectively), but blood pressure control rates were low (13.2%). These proportions increased with advancing stage of kidney disease. Elevated systolic blood pressure accounted for the majority of inadequate control. Male gender (odds ratio [OR] 0.86; 95% confidence interval [CI], 0.75-0.99), non-Hispanic black race (OR 0.76; 95% CI, 0.65-0.89), and body mass index of 30 kg/m(2) or more (OR 0.83; 95% CI, 0.73-0.94) were inversely related with blood pressure control. Those with stage 3 kidney disease were more likely to have blood pressure at goal than those with stage 1 kidney disease (OR 2.08; 95% CI, 1.55-2.80). CONCLUSION We conclude that despite increased awareness and treatment of hypertension, control rates in these participants are poor. This poor control rate centers around elevated systolic pressure in people who are obese, non-Hispanic black, or male. These data suggest that those who are aware of their kidney disease are more likely to achieve blood pressure control.

Prevalence of CKD and Comorbid Illness in Elderly Patients in the United States: Results From the Kidney Early Evaluation Program (KEEP)

BACKGROUND Elderly individuals with chronic kidney disease (CKD) have high rates of comorbid conditions, including cardiovascular disease and its risk factors, and CKD-related complications. In individuals aged > or = 65 years, we sought to describe the prevalence of CKD determined from laboratory test results in the Kidney Early Evaluation Program (KEEP; n = 27,017) and National Health and Nutrition Examination Survey (NHANES) 1999-2006 (n = 5,538) and the prevalence of diagnosed CKD determined from billing codes in the Medicare 5% sample (n = 1,236,946). In all 3 data sources, we also explored comorbid conditions and CKD-related complications. METHODS CKD was identified as decreased estimated glomerular filtration rate (<60 mL/min/1.73 m(2)) or increased albumin-creatinine ratio in KEEP and NHANES; CKD was identified using International Classification of Diseases, Ninth Revision, Clinical Modification codes in Medicare. Investigated comorbid conditions included diabetes, hypertension, high cholesterol level, coronary artery disease, congestive heart failure, cerebrovascular disease, peripheral vascular disease, and cancer, and CKD-related complications included anemia, hypocalcemia, hyperphosphatemia, and hyperparathyroidism. RESULTS The prevalence of CKD was approximately 44% in both KEEP and NHANES participants, and the prevalence of diagnosed CKD was 7% in Medicare beneficiaries. In all 3 data sets, the prevalence of CKD or diagnosed CKD was higher in participants aged > or = 80 years and those with comorbid conditions. For KEEP and NHANES participants, the prevalence of most comorbid conditions and CKD complications increased with decreasing estimated glomerular filtration rate. For participants with CKD stages 3-5, a total of 29.2% (95% CI, 27.8-30.6) in KEEP and 19.9% (95% CI, 17.0-23.1) in NHANES had anemia, 0.7% (95% CI, 0.4-0.9) and 0.6% (95% CI, 0.3-1.3) had hypocalcemia, 5.4% (95% CI, 4.7-6.1) and 6.4% (95% CI, 5.1-8.0) had hyperphosphatemia, and 52.0% (95% CI, 50.4-53.6) and 30.0% (95% CI, 25.9-34.3) had hyperparathyroidism, respectively. CONCLUSIONS CKD is common in the elderly population and is associated with high frequencies of concomitant comorbid conditions and biochemical abnormalities. Because CKD is not commonly diagnosed, greater emphasis on physician education may be beneficial.

Early detection and treatment of renal disease in hospitalized diabetic and hypertensive patients: Important differences between practice and published guidelines☆☆☆

This study was performed to ascertain the degree to which the care of hospitalized diabetic and hypertensive patients conforms to published guidelines for the detection and management of early renal disease. It was designed as a retrospective chart audit. Six hospitals, four nonurban referral centers, and two urban teaching institutions provided the data. Patients were a random sample of Medicare beneficiaries, with a mean age (SD) of 65.6 (9.1) years, admitted during 1994 with a primary or secondary diagnosis of either diabetes (n = 260) or hypertension (n = 327). A urinalysis was obtained for 163 (62.7%) of the diabetic patients. Among diabetics who had their urine tested, 31.3% had 1+ or greater dipstick proteinuria. A serum creatinine was obtained for 298 (91%) of the hypertensive patients, and 11.8% had a value of 1.5 mg/dL or greater. Abnormal renal function tests were recorded in the discharge summaries of 7.8% of the diabetic and 11.4% of the hypertensive patients. Patients with abnormal renal function were no more likely to be treated with angiotensin-converting enzyme inhibitors (ACEIs). Nonsteroidal antiinflammatory drugs (NSAIDs) were prescribed for 6% of diabetic and 8.8% of hypertensive patients with abnormal renal function at discharge. Despite the high prevalence of renal functional abnormalities detected by routine laboratory tests administered to elderly hospitalized diabetic and hypertensive patients, the medical records of these patients did not document awareness or appropriate management of the potential underlying kidney disease.

Chronic kidney disease, prevalence of premature cardiovascular disease, and relationship to short-term mortality

BACKGROUND Chronic kidney disease (CKD) is recognized as an independent cardiovascular disease (CVD) risk state, particularly in the elderly, and has been defined by levels of estimated glomerular filtration rate (eGFR) and markers of kidney damage. The relationship between CKD and CVD in younger and middle-aged adults has not been fully explored. METHODS Community volunteers completed surveys regarding past medical events and underwent blood pressure and laboratory testing. Chronic kidney disease was defined as an eGFR <60 mL x min(-1) x 1.73 m(-2) or urine albumin-creatinine ratio (ACR) > or =30 mg/g. Premature CVD was defined as self-reported myocardial infarction or stroke at <55 years of age in men and <65 years of age in women. Mortality was ascertained by linkage to national data systems. RESULTS Of 31 417 participants, the mean age was 45.1 +/- 11.2 years, 75.5% were female, 36.8% African American, and 21.6% had diabetes. A total of 20.6% were found to have CKD, with the ACR and eGFR being the dominant positive screening tests in the younger and older age deciles, respectively. The prevalences of premature myocardial infarction (MI), stroke, or death, and the composite were 5.3%, 4.7%, 0.8%, 9.2%, and 2.5%, 2.2%, 0.2%, 4.2% for those with and without CKD, respectively (P < .0001 for composite). Multivariable analysis found CKD (OR 1.44, 95% CI 1.27-1.63), age (OR 1.05 [per year], 95% CI 1.04-1.06), hypertension (OR 1.61, 95% CI 1.40-1.84), diabetes (OR 2.03, 95% CI 1.79-2.29), smoking (OR 1.91, 95% CI 1.66-2.21), and less than high school education (OR 1.59, 95% CI 1.37-1.85) as the most significantly associated factors for premature CVD or death (all P < .0001). Survival analysis found those with premature MI or stroke and CKD had the poorest short-term survival over the next 3 years after screening. CONCLUSIONS Chronic kidney disease is an independent predictor of MI, stroke, and death among men and women younger than age 55 and 65 years, respectively. These data suggest the biologic changes that occur with kidney failure promote CVD at an accelerated rate that cannot be fully explained by conventional risk factors or older age. Screening for CKD by using both the ACR and eGFR can identify younger and middle-aged individuals at high risk for premature CVD and near-term death.

CKD and cardiovascular disease in screened high-risk volunteer and general populations: the Kidney Early Evaluation Program (KEEP) and National Health and Nutrition Examination Survey (NHANES) 1999-2004.

BACKGROUND Chronic kidney disease (CKD) is recognized as an independent cardiovascular disease risk state. The relationship between CKD and cardiovascular disease in volunteer and general populations has not been explored. METHODS The National Kidney Foundation Kidney Early Evaluation Program (KEEP) is a community-based health-screening program to raise kidney disease awareness and detect CKD for early disease intervention in individuals 18 years or older with diabetes, hypertension, or family history of kidney disease, diabetes, or hypertension. KEEP volunteers completed surveys and underwent blood pressure and laboratory testing. Estimated glomerular filtration rate (eGFR) was computed, and urine albumin-creatinine ratio (ACR) was measured. In KEEP, CKD was defined as eGFR less than 60 mL/min/1.73 m(2) or ACR of 30 mg/g or greater. Cardiovascular disease was defined as self-reported myocardial infarction or stroke. Data were compared with National Health and Nutrition Examination Survey (NHANES) 1999-2004 data for prevalence of cardiovascular disease risk factors and cardiovascular outcomes. RESULTS Of 69,244 KEEP participants, mean age was 53.4 +/- 15.7 years, 68.3% were women, 33.0% were African American, and 27.6% had diabetes. Of 17,061 NHANES participants, mean age was 45.1 +/- 0.27 years, 52% were women, 11.2% were African American, and 6.7% had diabetes. In KEEP, 26.8% had CKD, and in NHANES, 15.3%. ACR was the dominant positive screening test for younger age groups, and eGFR, for older age groups, for both populations. Prevalences of myocardial infarction or stroke were 16.5% in KEEP and 15.1% in NHANES (P < 0.001) and 7.8% in KEEP and 3.7% in NHANES (P < 0.001) for individuals with and without CKD, respectively. In adjusted analysis of both KEEP and NHANES data, CKD was associated with a significantly increased risk of prevalent myocardial infarction or stroke (odds ratio, 1.34; 95% confidence interval, 1.25 to 1.43; odds ratio, 1.37; 95% confidence interval, 1.10 to 1.70, respectively). In KEEP, short-term mortality was greater in individuals with CKD (1.52 versus 0.33 events/1,000 patient-years). CONCLUSIONS CKD is independently associated with myocardial infarction or stroke in participants in a voluntary screening program and a randomly selected survey population. Heightened concerns regarding risks in volunteers yielded greater cardiovascular disease prevalence in KEEP, which was associated with increased short-term mortality.

The Kidney Early Evaluation Program (KEEP): Program Design and Demographic Characteristics of the Population

BACKGROUND Chronic kidney disease (CKD) recently was identified as a public health problem requiring a public health prevention approach. The National Kidney Foundation Kidney Early Evaluation Program (KEEP), initiated in 2000, meets the definition of a public health program, offering surveillance and early detection of CKD. This report aims to detail demographic characteristics of KEEP participants and compare them with characteristics of participants in the National Health and Nutrition Examination (NHANES) 1999-2004. METHODS KEEP is a CKD screening program enrolling individuals 18 years and older with a family history of kidney disease or personal or family history of diabetes or hypertension. Simple descriptive statistics were used in the analysis. For comparison, the NHANES sample was restricted to participants with hypertension or diabetes or a family history of hypertension or diabetes. RESULTS The number of KEEP participants grew exponentially over time. Most participants were aged 46 to 60 years. KEEP enrolled twice as many women as men (68.4% versus 31.5%). Minorities were well represented (33.4% African American, 12.3% Hispanic). Almost 58% of participants had some college or more education, and close to 85.0% had a physician. Compared with NHANES, the KEEP population was older and included a larger proportion of women and African Americans. Self-reported hypertension, self-reported diabetes, obesity, and CKD were higher in KEEP (52.9% versus 38.5%, 26.6% versus 9.9%, 43.6% versus 35.5%, and 22.8% versus 17.6%, respectively). CONCLUSIONS KEEP has been successful in enrolling individuals at risk of kidney disease, evidenced by the high levels of self-reported hypertension and diabetes.

Secondary Hyperparathyroidism, and not β2-Microglobulin Amyloid, as a Cause of Spontaneous Tendon Rupture in Patients on Chronic Hemodialysis

Spontaneous bilateral rupture of the extensor mechanisms of the knees, without significant history of trauma, has been reported rarely, generally in association with chronic metabolic disorders, such as chronic renal failure and secondary hyperparathyroidism. We report spontaneous tendon rupture in two patients on chronic hemodialysis for 4 and 11 years, with documented severe secondary hyperparathyroidism. One patient had spontaneous bilateral rupture of his quadriceps and partial avulsion of the left triceps tendons. The other patient had spontaneous rupture of his right quadriceps tendon. Both patients had markedly elevated serum intact parathyroid hormone and moderately elevated serum beta 2-microglobulin levels. Pathologic examination revealed diffuse immunohistochemical staining for beta 2-microglobulin but negative Congo-red staining of the ruptured tendon specimens. These cases and the previous reports in the literature suggest that secondary hyperparathyroidism may play a role in the pathogenesis of this clinical entity.

Race and Sex Differences in Hypertension Control in CKD : Results From the Kidney Early Evaluation Program (KEEP)

BACKGROUND African American men with chronic kidney disease (CKD) progress to end-stage renal disease more rapidly than African American women or whites. Uncontrolled hypertension worsens CKD, and disparities in hypertension control may contribute to disparities in CKD progression. STUDY DESIGN Cross-sectional. SETTING & PARTICIPANTS 10,827 individuals with CKD and self-reported hypertension screened in the Kidney Early Evaluation Program. PREDICTORS African American race, sex. OUTCOMES Hypertension control (blood pressure <130 mm Hg systolic and/or <80 mm Hg diastolic). MEASUREMENTS Self-report, physical examination (blood pressure), laboratory data (serum creatinine, microalbuminuria by urine dipstick). We calculated estimated glomerular filtration rates by using the 4-variable isotope dilution mass spectrometry Modification of Diet in Renal Disease Study equation. We classified CKD as early (stages 1 to 2) or late (stages 3 to 5) based on estimated glomerular filtration rate and microalbuminuria. RESULTS In individuals with early CKD, African American women (odds ratio [OR], 1.47; 95% confidence interval [CI], 1.14 to 1.88), white men (OR, 1.85; 95% CI, 1.39 to 2.46), and white women (OR, 1.69; 95% CI, 1.28 to 2.22) had greater odds of hypertension control (blood pressure <130/80 mm Hg) than African American men. In individuals with late CKD, white men (OR, 1.66; 95% CI, 1.10 to 2.52) and white women (OR, 1.67; 95% CI, 1.13 to 2.46) had greater odds of hypertension control than African American men. No differences were seen between African American men and women with late CKD. LIMITATIONS No information for medication regimens. CONCLUSIONS African American men with CKD have poorly controlled hypertension compared with African American women and whites, particularly in the early stages of disease. Efforts to aggressively treat hypertension in this population may help narrow the race and sex disparities in progression to end-stage renal disease.

Kidney Early Evaluation Program (KEEP): Findings From a Community Screening Program

PURPOSE The Kidney Early Evaluation Program (KEEP), which was started in 1997, aims to identify persons at risk for chronic kidney disease (CKD) and encourage at-risk persons to seek evaluation and management from a healthcare provider. METHODS Community screening was conducted using a standardized questionnaire and test panel that was administered by local affiliates of the National Kidney Foundation (NKF) using volunteer lay and medical personnel. The screening was limited to persons at high risk for CKD, which was defined as those with a personal history of diabetes or hypertension, or a first-order relative with diabetes, hypertension, or kidney disease. The KEEP Data Coordinating Center was established to maintain a de-identified database of demographic information and test results on the screened persons. RESULTS Data on the first 11,246 participants were analyzed. As expected, the KEEP population was enriched with African Americans and was older than the general population. Diabetes was determined by self-report or abnormal blood glucose levels at screening and was present in 2690 of the persons screened. Chronic kidney disease was identified in 47.4% of this population. CONCLUSIONS Targeted community screening for kidney disease in a high-risk population can identify a significant number of persons with CKD, enhance awareness of the disease, and may improve health-seeking behavior.