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Figure 1 :X-axis depicts age of the patient from antenatal to postnatal period and Y-axis depicts the pulmonary vascular resistance (PVR). There is a decrease in PVR at birth which continues to decline in the first 2-6 weeks.

Figure 1 :X-axis depicts age of the patient from antenatal to postnatal period and Y-axis depicts the pulmonary vascular resistance (PVR). There is a decrease in PVR at birth which continues to decline in the first 2-6 weeks.