Demographic data, mean airway pressure, and number of infants with clinically significant reversed ductus venosus flow velocity (DVFV) during atrial contraction
| No of Cases | Birthweight (g) Median (range) | Gestational age (weeks) Median (range) | Mean airway pressure (cm H2O) Median (range) | Significant reversed flow2-150 | |
|---|---|---|---|---|---|
| Study group | 16 | 2740 (1470–4230) | 35 (32–42) | 12 (7.5–16.5) | 16/16 |
| Control group I | |||||
| Subgroup IA | 50 | 3570 (2900–4685) | 40 (38–42) | 0/502-160 | |
| Subgroup IB | 33 | 1290 (625–2100) | 31 (24–32) | 0/33 | |
| Subgroup IC | 13 | 1905 (1415–2495) | 34 (32–35) | 0/13 | |
| Control group II | 11 | 920 (625–1720) | 27 (24–31) | 9.3 (5–14.6) | 0/11 |
| Control group III | 6 | 2595 (1180–3700) | 38 (30–40) | 6/6 | |
↵2-150 Group differences highly significant (study group and control group III vs other groups).
↵2-160 During the first day of life, reversed DVFV during atrial systole was observed in 10 infants.
(Study group = neonates with PPHN, control group IA = healthy term neonates, control group IB = preterm neonates without PPHN, control group IC = preterm neonates with gestational age similar to that of study group, control group II = mechanically ventilated neonates with increased intrathoracic pressure but without PPHN, control group III = neonates with congenital heart defects and raised right atrial pressure).