Incidence, Recognition, and Follow-up of Laboratory Evidence of Acute Kidney Injury in Primary Care Practices: Analysis of 93,259 Creatinine Results

Document Type

Journal Article

Publication Date

9-4-2024

Journal

The American journal of medicine

DOI

10.1016/j.amjmed.2024.08.032

Keywords

acute kidney injury; chronic kidney disease; creatinine; glomerular filtration rate; primary care

Abstract

BACKGROUND: Community acquired acute kidney injury (CA-acute kidney injury) is under-recognized in the outpatient setting and is associated with adverse outcomes. METHODS: We analyzed the incidence of CA-acute kidney injury in an academic primary care practice and community health center and assessed recognition/followup as determined by repeat creatinine measurement (loop-closed). We reviewed 93,259 specimens for 36,593 unique patients from 1/1/2018 through 12/31/2021. RESULTS: There were 220 unique patients with CA-acute kidney injury defined as a >75% increase in creatinine from baseline; incidence: 150/100,000 (0.15% per year). 137 patients (62.3%) had repeat serum creatinine performed within 30 days. Chart reviews of the 83 (37.72%) patients with open loops found there was no follow-up creatinine ordered in 69/83 (83.1%) patients. Mean baseline creatinine was higher and eGFR was lower in the loop-closed group (0.92±0.4mg/dl; 84.45±27.49mls/min) versus (0.63±0.34mg/dl; 105.19±26.67mls/min) in the loop-open group (p<.0001). Preexisting chronic kidney disease was more prevalent in loop-closed patients (35/137; 25.6%) compared to those with open-loops (3/83; 3.6%). Patients with baseline chronic kidney disease were more likely to have the loop-closed. Progression to new chronic kidney disease was common among CA-acute kidney injury patients, occurring in 23.94% of loop-open and 17.50% of loop-closed patients. New baseline eGFR was lower in all groups. CONCLUSIONS: Clinicians frequently overlooked a clinically significant change in eGFR, especially when the baseline creatinine and incident creatinine levels were in the "normal" range.

Department

Pathology

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