Figure 1From: High-frequency oscillatory ventilation and short-term outcome in neonates and infants undergoing cardiac surgery: a propensity score analysisNumber of neonates and infants who underwent surgery during the study period. The number of patients included in each group after matching is shown on the bottom of each column. High frequency oscillation was used since 2007. CMV, conventional mechanical ventilation; HFOV, high-frequency oscillatory ventilation.Back to article page