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Table 3 Hemodynamic characteristics of the ductus arteriosus (mean ± SD)

From: Bi-level CPAP does not change central blood flow in preterm infants with respiratory distress syndrome

  nCPAP Bilevel p
Ductus arteriosus    
Pulsatile pattern (%) 57.1 57.1 n/a
Vmax (m/sec) 1.68 ± 0.5 1.46 ± 0.38 0.19
% R-L shunt 6.2 ± 10.6 12.6 ± 11.7 0.22