Pulmonary hypertension in children with severe OSA: Can CO2 provide a clue?-V18I6 Pulmonary hypertension in children with severe OSA: Can CO2 provide a clue?-V18I6 Download The differences between daytime and nighttime heart rate variability may usefully predict the apnea-hypopnea index in patients with obstructive sleep apnea-V18I6 Twenty-year follow-up of children with obstructive sleep apnea-V18I6