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Chapter 10: Glomerular Disease in the Elderly

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Chapter 10: Glomerular Disease in the Elderly Chapter 10: Glomerular Disease in the Elderly Christine K. Abrass Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington School of Medicine, Seattle, Washington APPROACH TO AND UNIQUE FEATURES of the benefit of diagnosis and appropriate inter- OF GLOMERULONEPHRITIS IN ELDERLY vention. PERSONS Recognition, diagnosis, and management of glo- GENDER-, ETHNIC-, AND AGE-RELATED merular disease in elderly persons have several DISPARITIES IN HEALTHCARE unique challenges. Reductions in GFR are common in individuals over the age of 75. Because this so Studies continue to show that underrepresented often occurs in the setting of aging nephropathy, minorities, women, and elderly persons are pro- hypertension, or vascular disease, other intrinsic vided standard care and included in clinical trials at kidney diseases are not considered in the differen- rates below those for white men6,7; however, these tial diagnosis. Aging nephropathy is characterized same groups have higher rates of certain diseases by loss of GFR of approximately 1.7 ml/min per and worse outcomes. This relatively poorer prog- year1; thus, renal function seems to be stable over a nosis argues for a more aggressive approach. Given several year window of time. However, this can rep- that women make up a steadily higher proportion resent a significant loss of renal function over the of the elderly population with each year of increas- final 30 yr of life. Within a short time frame, any ing age, disparities in approach to their care is even change in renal function should indicate the possi- more relevant in this age group. With any given bility of an alternative diagnosis. When prior mea- disease, women lose renal function at a slower rate sures of renal function are not available, estimation than men until after menopause when this benefit is of GFR using the Cockcroft-Gault formula or an- lost. Recognition of changes in risk factors and in- other formula that takes into account age and an cidence of specific forms of GN throughout the assumed serum creatinine of 0.8 mg/dl will allow lifespan is critical to resolving health disparities. calculation of a rough estimate of age-adjusted GFR. Should the measured eGFR be substantially below that predicted on the basis of age alone, other URINARY PROTEIN EXCRETION IN diagnoses should be considered. Using analysis of ELDERLY PERSONS large databases, O’Hare et al.2,3 have shown that ag- ing nephropathy per se is not usually associated with Standard teaching often taught that urinary protein proteinuria. Because many of these individuals excretion increases with age. Because these con- have not been subjected to renal biopsy, the actual cepts were developed based on studies of subjects pathology is unknown; however, some have argued living in nursing homes, it was thought that these that the absence of proteinuria excludes significant data reflected disease, often urinary tract infection, pathology. Based on these arguments, the presence and thus were thought not to be relevant to the of proteinuria or active urinary sediment should be elderly population at large. Subsequent studies8 considered as evidence of renal disease other than age-associated reduction in GFR,4,5 and the possi- bility of glomerulonephritis (GN) should be con- Correspondence: Christine K. Abrass, MD, Professor of Medi- sidered. Despite these caveats, urinary abnormali- cine, Division of Gerontology and Geriatric Medicine, University of Washington School of Medicine, UW Medicine Lake Union, 815 ties and reductions in GFR are frequently Mercer Street, Seattle, WA 98109. Phone: 206-897-1966; Fax: erroneously attributed to aging per se and not pur- 206-897-1300; Email: [email protected] sued further, thus depriving the elderly individual Copyright ᮊ 2009 by the American Society of Nephrology American Society of Nephrology Geriatric Nephrology Curriculum 1 showed that healthy elderly subjects generally do not have pro- elderly subjects show a low rate of complications and iden- teinuria; however, in those who do, there is significant loss of tification of treatable forms of kidney disease; however, renal function over 5 yr of follow-up. Recent studies have rates of biopsy in elderly individuals continue to be low. shown that rates of albuminuria in community-dwelling el- This raises the possibility that more biopsies should be done derly subjects increase with age and may reach 37% in individ- in elderly persons. Indications for renal biopsy are shown in uals over the age of 80.9 As in other age groups, the presence of Table 1. albuminuria shows increased risk for dementia,9 hypertension, cardiovascular disease, and progressive renal disease. Based on these findings, proteinuria in elderly individuals should be viewed as an indicator of renal disease and a predictor of other POSTINFECTIOUS GLOMERULONEPHRITIS disorders that have implications for diagnosis, therapy, and outcomes. These findings are somewhat difficult to reconcile The most common organism associated with acute prolifera- with epidemiologic database studies such as those reported by tive glomerulonephritis is Group A streptococcus. This entity O’Hare et al., which indicate that elderly individuals with GFR is uncommon in adults, and in general, its incidence is declin- 13 Ͻ60 ml/min usually do not have proteinuria. Additional stud- ing in the developed world. A recent review of 86 cases ies are needed to clarify the nature and natural history of aging showed a mean age of 56 yr, with 34% being over the age of 64. nephropathy per se; but all studies indicate that, when protein- Unlike what occurs in children, as many as 38% had an under- uria is present, specific diagnoses are usually identified on bi- lying disorder associated with immunocompromise. Com- opsy and outcomes are poorer. plete remission occurred in slightly more than one half of all patients and was less likely in those with pre-existing renal disease or illnesses associated with immunocompromise. RENAL BIOPSY IN ELDERLY PERSONS Among individuals with pre-existing diabetic glomeruloscle- rosis, remission was rare and rapid progression to end-stage Despite the frequency of urinary abnormalities and reduc- kidney disease (ESKD) often followed. Thus, outcomes seem tions in GFR among elderly individuals, only 15% of renal to be worse in elderly persons. biopsies are from individuals over the age of 65 and even No studies have addressed the incidence or outcomes in fewer are in individuals over the age of 75. As a result, very older individuals with postinfectious GN caused by organisms few data are available that inform our understanding of GN other than Group A streptococcus. Given the frequency of in elderly individuals.5 The limited number of biopsies in pneumococcal pneumonia and other infections in elderly in- the face of high rates of proteinuria suggests that many older dividuals, infections that are associated with postinfectious GN individuals with kidney disease are not provided a specific less often in younger individuals may contribute a higher pro- diagnosis or offered disease-specific treatments to slow the portion in elderly persons. rate of progression. It is well documented that inflamma- tory symptomatology and thus clinical manifestations are blunted in elderly persons, which leads to atypical presen- LUPUS NEPHRITIS tations even for common diseases. This also can contribute to missed or delayed diagnosis in this age group. Nephrotic Lupus is generally a disease of women of child-bearing age; syndrome is often misdiagnosed as congestive heart failure. however, 10 to 20% occurs in older individuals including those As elderly individuals with nephrotic syndrome had focal over the age of 65. Arthritis, fever, serositis, sicca symptoms, sclerosis (FSGS; 23%), minimal change disease (MCD; Raynaud’s syndrome, lung disease, and neuropsychiatric 19%), and membranous nephropathy (MN; 15%), thera- symptoms are more common in elderly patients, whereas ma- peutic intervention would be expected to modify their out- lar rash, discoid lupus, and GN are less common. Serologic comes. Among those individuals with an acute nephritic manifestations include ANA, anti-Ro, and anti-La, whereas syndrome, most had pauci-immune, MPO-ANCA positive, anti-DNA is less common. When lupus with or without ne- crescentic GN, whereas the remainder had acute interstitial phritis occurs in elderly individuals, diagnosis is often delayed. nephritis.10 One study focused on individuals over the age of When present, lupus nephritis should be treated the same as in 80 (3% of the biopsies in their series).11 Similar to the pre- younger subjects.14 vious study, with advanced age, the majority of individuals had crescentic GN, whereas only 15% had MN. IgA ne- phropathy and lupus nephritis were uncommon in all se- Table 1. Indications for consideration of renal biopsy in ries.12 Even in the very old, 40% had a treatable entity iden- the elderly tified, and in the remainder, prognostic information was GFR reduced to a degree greater than predicted for age alone attained and potentially harmful empiric therapy was Acute change in GFR avoided. Elderly persons who are treated respond similarly Proteinuria to younger individuals. All published studies of biopsy in Active urinary sediment 2 Geriatric Nephrology Curriculum American Society of Nephrology MINIMAL CHANGE DISEASE to improved outcomes. Delays in diagnosis and initiation of therapy are uniformly associated with poor outcomes; thus, As many as 15 to 20% of older
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