Table 3.13 - The Effects of Early (10-22 sec.) and Late (approx. 5 min.) Clamping of the Umbilical Cord on Blood Volume, * Blood Pressure, and Arterial PO2 and pH (means +/- S.E.M.) in Normal full-term Human Infants**.
| Umbilical cord clamped | |||
|---|---|---|---|
| Postnatal Time | Early | Late | |
| Blood volume (ml/kg) | 30 min 24 hr | 78 +/- 1 86 +/- 2 | 99 +/- 3 96 +/- 2 |
| Hematocrit (%) | 30 min 24 hr | 47 44 | 59 62 |
| Arterial blood pressure (mm Hg) | 5-10 min 4 hr | 44 +/- 3 52 +/- 5 | 69 +/- 3 71 +/- 3 |
| Arterial pH Arterial PO2 (mm Hg) |
30 min 30 min |
7.24 +/- 0.01 55 +/- 4 | 7.30 +/- 0.01 45 +/- 1 |
| * estimated using I131 tagged human albumin. ** Usher, Shephard & Lind, 1963; and Buckels & Usher, 1965. *** obtained from an unwarmed heel. | |||