Prognostic value of oxygen saturation and heart rate during a six-minute walk test in pediatric pulmonary hypertension

Background/aimTo evaluate the pre and post-treatment heart rate and oxygen (O₂) saturation values measured before, during and after 6MWT in children who received PAH-specific treatment and to determine the effect of these variables on prognosis.Materials and methodsThis retrospective study included 29 patients who were diagnosed as PAH and treated. The transcutaneous O₂ saturationand heart rate levels were recorded before the test: baseline (Sat0, HR0), at the end of the test: exercise (Sat1_, HR1)and 5 min after the test: recovery (Sat2_, HR2). The increase in heart rate was defined as HR1-HR0 and the decrease in saturation as Sat0-Sat1. The results obtained before and after the PAH-specific treatment were analyzed and their effect on survival was assessed. Results Fifteen of 29 patients were female (51.7%). The mean age was 127.2 ± 44.8 months and the median follow-up time was 60 (12–156) months. Only pre-treatment HR1 was found associated with survival. The mean HR1 value of survivors was 122.8 ± 18.4 and that of deceased 94.3 ± 19.1 (p = 0.03). Post-treatment 6MWT was associated with survival. It was 453.3 ± 96.5 m for survivors and 250 ± 135.2 m for deceased (p = 0.02).Conclusion Post-treatment 6MWT, FC and proBNP had prognostic value in pediatric patients with PAH. The decrease in saturation and increase in heart rate were not found to have a prognostic value. Pre-treatment HR1was associated with survival. Identification of these prognostic factors at the beginning and throughout the treatment may be a guide for detecting the severity of the disease and follow-up.