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Correlation of Red Blood Cell Casts With Renal Dysfunction in Patients With Infection-Related Glomerulonephritis.
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- Author(s): Mineaki Kitamura; Biederman, Laura; Ibrahim, Dalia; Nadasdy, Tibor; Brodsky, Sergey V.; Satoskar, Anjali A.
- Source:
Archives of Pathology & Laboratory Medicine. May2024, Vol. 148 Issue 5, p545-552. 8p. - Source:
- Additional Information
- Subject Terms: BIOPSY; STATISTICAL correlation; ANTICOAGULANTS; ERYTHROCYTES; LOGISTIC regression analysis; SEVERITY of illness index; DESCRIPTIVE statistics; MULTIVARIATE analysis; GLOMERULONEPHRITIS; ODDS ratio; ELECTRONIC health records; RESEARCH; CONFIDENCE intervals; COMPARATIVE studies; KIDNEYS; HISTOLOGY; GLOMERULAR filtration rate
- Abstract: * Context.--Infection-related glomerulonephritis (IRGN) usually manifests as a proliferative immune-complex glomerulonephritis. The degree of renal dysfunction at presentation can vary. Association with histologic features on kidney biopsy remains unknown. Objective.--To study the correlation between renal function in IRGN at the time of biopsy and the severity of histologic features. Design.--Culture-proven IRGN cases at our facility were included and divided based on estimated glomerular filtration rate (eGFR) 15 ml/min/1.73 m². Patients' demographic and pathologic findings were obtained from electronic medical records and kidney biopsy reports. Results.--In total, 104 cases were diagnosed with IRGN on biopsy (mean age, 55.6 ± 15.6 years; male, n = 79 [76%]; median eGFR, 14.5 mL/min/1.73 m²), and 51 of 104 showed eGFR <15 mL/min/1.73 m². Among all the histologic features assessed, only percent tubules with red blood cell (RBC) casts showed statistical difference, being significantly higher in the lower-eGFR group (P = .004). Multivariable logistic regression analysis also showed that %tubules with RBC casts were associated with lower eGFR (odds ratio, 1.12; 95% CI, 1.01-1.24; P = .01). Patients with 5% or more RBC casts (n = 31) showed a lower eGFR (P = .02) and a higher %cellular crescent (P < .001) compared with those with less than 5% RBC casts. Patients with concomitant anticoagulant therapy (n = 11) showed higher percentages of RBC casts than those without anticoagulants (P = .02). Conclusions.--Particular attention to the extent of RBC casts on kidney biopsy is recommended in patients with IRGN because these portend worse renal dysfunction, more so in patients requiring anticoagulation (including for hemodialysis) because they are especially vulnerable to developing anticoagulant-related nephropathy. [ABSTRACT FROM AUTHOR]
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