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5 factors associated with renal infarction in patients with flank pain

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Clinical factors that may help predict renal infarction (RI) in patients with flank pain include age ≥65 years, male sex, atrial fibrillation, current smoker, and no hematuria, according to study results.

Flank pain is a common complaint of patients with RI.

In this retrospective single-center study, 2131 patients complaining of flank pain at a tertiary care hospital were included. Overall, 1.8% (39 patients) of the study participants had RI.

From a multivariable logistic regression analysis, the following were significantly associated with the occurrence of RI:

-Age ≥ 65 years (odds ratio [OR], 3.249; 95% confidence interval [CI], 1.366-7.725; P = 0.008)
-Male sex (OR, 2.846; 95% CI, 1.190-6.808; P = 0.019)
-Atrial fibrillation (OR, 10.386; 95% CI, 3.724-28.961; P < 0.001)
-Current smoker (OR, 10.022; 95% CI, 4.565-22.001; P < 0.001)
-No hematuria (OR, 0.267; 95% CI, 0.114-0.628; P = 0.002)

Nah S, Han S, Kim HB, et al. Predictors of renal infarction in patients presenting to the emergency department with flank pain: A retrospective observational study. PLoS One. 2021;16(12):e0261054. doi: 10.1371/journal.pone.0261054. PMID: 34874969; PMCID: PMC8651137.