Pediatric arterial thrombosis: A single‐institution cohort study of patient characteristics and thrombosis outcomes

Abstract Background Arterial thrombosis (AT) is an increasingly recognized complication in pediatrics. Consensus clinical practice guidelines suggest immediate removal of the indwelling arterial catheter and a short course (5‐7 days) of anticoagulation. The optimal duration and modality of antithrombotic therapy in children are yet to be determined. Aims Describe treatment patterns and outcomes in pediatric patients with AT and explore predictors for complete thrombus resolution or long‐term complications. Methods Single‐institution retrospective study. Patients were identified by ICD‐9 and ICD‐10 codes for the diagnosis of AT or reports of AT on ultrasound from January 1, 2012, to October 1, 2022. Descriptive and logistic regression analyses were used. Results 101 patients were included. The median age was 2.2 months. The most common underlying diagnoses were congenital heart disease (39.6%) and infection (22.8%). A majority of patients had symptomatic thrombosis in an extremity, and 78% were catheter‐associated. 81% of patients received anticoagulation with a median duration of 35 days. Out of the 70 patients who were treated with anticoagulation alone and had a follow‐up imaging, 70% had complete resolution after 90 days of anticoagulation. No clear predictors of complete resolution were identified. Eighteen patients had long‐term sequelae secondary to arterial insufficiency. Those with infection‐associated AT were more likely to have long‐term complications. The major and clinically relevant non‐major bleeding rate was 11%. Conclusion Duration of anticoagulation was widely variable, and 70% of patients achieved complete resolution by 90 days of anticoagulation. A significant proportion of patients developed long‐term sequelae secondary to arterial insufficiency. Sepsis/infection at the time of diagnosis with AT was more likely to be associated with long‐term complications.