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
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