Later Development, Develop. Physiol., Dr. D. Penney





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 TimeEarlyLate
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.



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