Pediatric venous thromboembolism: incidence and patient profile in a single Brazilian institution.

BACKGROUND

As the diagnosis of Pediatric venous thromboembolism has dramatically increased in recent decades, this study aims to evaluate these patients, determining the incidence and describing their biological and clinical characteristics.

METHODS

An observational, cross-sectional study was conducted at a Brazilian quaternary hospital between January 2022 and February 2023. Under 18-year-old hospitalized patients with a confirmed diagnosis of venous thromboembolism were included, while those with arterial or chronic thrombosis were excluded. Data on biological and clinical characteristics, diagnosis and treatment were evaluated. A descriptive data analysis was performed and the incidence of hospital-associated thrombosis was calculated.

RESULTS

Thirty-nine pediatric patients were evaluated. The incidence of hospital-associated thrombosis was 19.9 cases per 10,000 pediatric hospitalizations. Median age at diagnosis was four months (range: 12 days-17 years). Most of the patients (66.7%) were asymptomatic, with venous thromboembolism being diagnosed incidentally. In all cases, at least one risk factor was identified and in 74.6% of cases four or more factors were present. The principal risk factors were the presence of a central venous catheter (89.7%) and infection (89.7%). Thrombogenic comorbidities, particularly congenital heart disease, were present in 48.7% of patients.

CONCLUSIONS

The incidence of venous thromboembolism found in the present study was lower than rates reported in developed countries. The principal characteristics of this sample were a greater frequency of central venous catheter and infection as risk factors, and the fact that the cases consisted mainly of newborns and individuals with heart disease.