Management of Elevated Creatinine in Elderly Patients

Assessment of Renal Function

The American Geriatrics Society recommends calculating estimated GFR using the MDRD equation, which takes into account age, sex, race, and serum creatinine, as serum creatinine alone is an inadequate screening test for renal function in elderly patients 1, 2, 3
For patients over 80 years old or those with reduced muscle mass, the Journal of the American Geriatrics Society suggests considering obtaining a timed urine collection for more accurate assessment of creatinine clearance 4
A creatinine of 1.87 mg/dL in an 87-year-old likely represents chronic kidney disease stage 3 or worse (eGFR <60 ml/min/1.73m²), according to the European Heart Journal 3, 5

The European Heart Journal recommends evaluating for potentially reversible causes of renal impairment, including urinary obstruction, and checking urinalysis for proteinuria, hematuria, or signs of intrinsic renal disease 3, 5, 6
The Journal for ImmunoTherapy of Cancer suggests reviewing medication list for nephrotoxic drugs that should be discontinued or dose-adjusted, and assessing for hyperkalemia, metabolic acidosis, and other electrolyte abnormalities 6, 7

The Journal of the American Geriatrics Society recommends discontinuing metformin if present, as it is contraindicated in elderly patients with serum creatinine ≥1.4 mg/dL (women) or ≥1.5 mg/dL (men) due to increased risk of lactic acidosis 4
The Journal for ImmunoTherapy of Cancer suggests using caution with ACE inhibitors and ARBs, monitoring for acute increases in creatinine, and avoiding NSAIDs due to risk of further renal impairment 6
The American Heart Association, as published in Circulation, recommends adjusting dosages of medications cleared by the kidneys based on estimated GFR, and using aldosterone antagonists with extreme caution 1, 2, 7

The Journal for ImmunoTherapy of Cancer recommends monitoring serum creatinine, electrolytes, and estimated GFR regularly, every 2-3 days for significant changes (>30% increase), and weekly for smaller changes (grade 1 elevation) 6, 8
The Journal of Hepatology suggests assessing for signs of fluid overload or dehydration at each visit, and considering nephrology consultation for persistent or worsening renal dysfunction, significant proteinuria, or unclear etiology of renal impairment 6, 8, 9

The Journal of the American Geriatrics Society recommends blood pressure control, with target <140/90 mmHg (ideally <130/85 mmHg in patients with renal disease), and monitoring for complications of chronic kidney disease, including anemia, secondary hyperparathyroidism, metabolic acidosis, and cardiovascular disease 3, 4, 8, 9
The European Heart Journal suggests assessing cardiovascular risk factors, as renal impairment significantly increases cardiovascular morbidity and mortality 3, 9

The Annals of Internal Medicine recommends avoiding relying solely on serum creatinine without calculating estimated GFR in elderly patients, and recognizing that even mild elevations in serum creatinine can represent substantial reductions in GFR in elderly patients 1, 2
The Nature Reviews Nephrology suggests not underestimating the significance of renal impairment in overall morbidity and mortality risk 9