Characteristics | All PPHN (n = 115) | Preterm (< 34 weeks) PPHN (n = 41) | Late preterm and term (≥34 weeks) PPHN (n = 74) | P value (< 34 weeks PPHN vs ≥34 weeks PPHN) | Non-PPHN (n = 115) | P value (≥34 weeks PPHN vs non-PPHN) |
---|---|---|---|---|---|---|
Baseline characteristics | ||||||
 Male gender, n(%) | 64 (55.7) | 24 (58.5) | 40 (54.1) | 0.6430 | 62 (53.9) | 0.9849 |
 Birth weight (g), mean(±SD) | 2516.2 ± 1006.2 | 1358.8 ± 391.7 | 3157.4 ± 572.6 | < 0.001 | 3169.3 ± 576.6 | 0.8896 |
 Gestational age (weeks), mean(±SD) | 34.9 ± 4.4 | 29.7 ± 2.3 | 37.8 ± 1.9 | < 0.001 | 38.2 ± 1.4 | 0.1649 |
 Premature (< 37 weeks), n(%) | 60 (52.2) | 41 (100) | 19 (25.7) | < 0.001 | 17 (14.8) | 0.0627 |
 Caesarean, n(%) | 76 (66.1) | 24 (58.5) | 52 (70.3) | 0.2030 | 70 (60.9) | 0.1873 |
Primary diagnosis for PPHN cases | ||||||
 Respiratory distress syndrome, n(%) | 53 (46.1) | 27 (65.9) | 26 (35.1) | 0.0015 | / | / |
 Meconium aspiration syndrome, n(%) | 10 (8.7) | 0 (0) | 10 (13.5) | 0.0135 | / | / |
 Pneumothorax, n(%) | 17 (14.8) | 3 (7.3) | 14 (18.9) | 0.0932 | / | / |
 Pneumonia, n(%) | 44 (38.3) | 14 (34.1) | 30 (40.5) | 0.4992 | / | / |
 Bronchopulmonary dysplasia, n(%) | 10 (8.7) | 9 (22.0) | 1 (1.4) | 0.0004 | / | / |
Treatment and prognosis for PPHN cases | ||||||
 Ventilation time (days), mean(±SD) | 12.7 ± 18.9 | 22.2 ± 26.9 | 6.8 ± 6.7 | 0.0015 | / | / |
 iNO, n(%) | 17 (14.8) | 1 (2.4) | 16 (21.6) | 0.0055 | / | / |
 Vasoactive agents therapy, n(%) | 64 (55.7) | 19 (46.3) | 45 (60.8) | 0.1347 | / | / |
 ECMO, n(%) | 4 (3.5) | 0 (0) | 4 (5.4) | 0.2952 | / | / |
 Mortality, n(%) | 14 (12.2) | 7 (17.1) | 7 (9.5) | 0.2474 | / | / |