This aim of the study is to evaluate the effect of nebulized nitroglycerin on echocardiographic (biventricular function, pulmonary artery pressure, PDA and PFO shunting and tissue doppler imaging) and clinical parameters (Oxygen saturation index, heart rate, blood pressure, mean airway pressure, ventilation setting) in patients with PPHN.
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Estimation of Pulmonary artery pressure (PAP)
Timeframe: first 7 days of life
Right ventricular (RV) function in ml/kg/min
Timeframe: first 7 days of life
Left ventricular (LV)function in ml/kg/min
Timeframe: first 7 days of life