Table 3.
Fetal vascular resistance indices and flow velocities
| 400 m European n= 44 | 3600 m European n= 37 | 400 m Andean n= 44 | 3600 m Andean n= 43 | P-values | |
|---|---|---|---|---|---|
| Umb. A PI (placental insertion) | 0.83 ± 0.02 | 0.92 ± 0.04 | 0.84 ± 0.02 | 0.88 ± 0.04 | P < 0.05 altitude |
| Umb. A PSV (cm s−1 placental insertion) | 46 ± 2 | 41 ± 3 | 52 ± 3 | 39 ± 2 | P < 0.0001 altitude |
| Umb. A EDV (cm s−1 placental insertion) | 20 ± 1 | 17 ± 1 | 23 ± 1 | 16 ± 1 | P < 0.0001 altitude |
| Umb. A PI (fetal insertion) | 0.84 ± 0.03 | 0.96 ± 0.04 | 0.84 ± 0.02 | 0.90 ± 0.04 | P < 0.01 altitude |
| Umb. A PSV (cm s−1, fetal insertion) | 53 ± 2 | 45 ± 2 | 54 ± 2 | 49 ± 2 | P < 0.005 altitude |
| Umb. A EDV (cm s−1, fetal insertion) | 23 ± 1 | 18 ± 1 | 23 ± 1 | 20 ± 1 | P < 0.0001 altitude |
| MCA PI | 1.49 ± 0.06 | 1.50 ± 0.06 | 1.48 ± 0.06 | 1.53 ± 0.08 | NS |
| MCA PSV (cm s−1) | 50 ± 2 | 54 ± 2 | 52 ± 2 | 60 ± 2 | P < 0.01 altitude |
| MCA EDV (cm s−1) | 12 ± 1 | 13 ± 1 | 13 ± 1 | 15 ± 1 | NS |
Abbreviations: Umb. A-Umbilical Artery, PI-Pulsatility Index, PSV-Peak Systolic Velocity, EDV-End Diastolic Velocity, MCA-Middle Cerebral Artery.