The incidence of hypertension among children after renal trauma: A matched cohort analysis

Purpose: To describe the intermediate-term incidence of hypertension following pediatric renal trauma relative to that in an extremity (control group) trauma cohort.

Methods: This was a single-institution matched cohort study of pediatric patients presenting to a Level I trauma center between 2010 and 2019. The primary cohort included patients who sustained renal trauma, and a comparator cohort of sex- and age-matched patients with isolated extremity fracture was identified. The primary outcome was new hypertension, and a sensitivity analysis was conducted of any elevated blood pressure (EBP). Conditional logistic regression was performed and adjusted for overweight/obese status.

Results: There were 62 renal trauma patients included, representing 35% of all eligible patients seen in the study period. Hypertension was not found to be more prevalent with renal trauma (OR 1.18, 95% CI: 0.41, 3.39). The incidence of hypertension (9.7-11.3%) and EBP (22.6-32.3%) was comparable between renal trauma and control groups.

Conclusion: Despite a high incidence of EBP and hypertension in pediatric patients after renal or extremity trauma, we did not observe an association between renal trauma and postinjury hypertension. We identified no cases of malignant or symptomatic hypertension, and no surgical interventions for renovascular hypertension was performed. Our findings suggest that only select patients, rather than most renal trauma patients, may benefit from monitoring for postinjury hypertension.