To define the characteristics of hemodynamically significant PDA by echocardiography, to investigate the systemic effects of the ductus with cerebral and renal Doppler flow studies, and to determine the oxygen consumption in the cerebral tissue with NIRS in newborns below 32 weeks of age with PDA.
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Diameter of PDA
Timeframe: 1 year
Velosity of PDA
Timeframe: 1 year
Left ventricule expansion
Timeframe: 1 year
Velocity of internal carotid arteries, middle carotid arteries, anterior cerebral arteries and renal arteries
Timeframe: 1 year