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Neonatal transitional physiology: a new paradigm.

Judith S Mercer1, Rebecca L Skovgaard

  • 1University of Rhode Island, Kingston, USA.

The Journal of Perinatal & Neonatal Nursing
|March 26, 2002
PubMed
Summary
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Early umbilical cord clamping significantly alters neonatal blood volume, potentially harming newborns. This practice may hinder a healthy transition, leading to hypovolemic and hypoxic damage. A physiologic birth model emphasizes adequate blood volume for successful neonatal transition.

Area of Science:

  • Neonatal physiology
  • Perinatal medicine
  • Obstetrics

Background:

  • Early umbilical cord clamping is a common practice lacking robust evidence.
  • This procedure causes significant, potentially harmful, fluctuations in neonatal blood volume (25%-40%).
  • Such drastic blood volume changes can negatively impact neonatal transition and outcomes.

Purpose of the Study:

  • To challenge the traditional respiratory-centric model of neonatal transition.
  • To propose a new model where adequate blood volume is the primary driver of successful neonatal transition.
  • To illustrate how physiologic birth supports a normal transition through maintained blood volume.

Main Methods:

  • Review and synthesis of existing literature on neonatal transition and cord clamping.

Related Experiment Videos

  • Development of a theoretical model for neonatal transition.
  • Analysis of the impact of blood volume on neonatal adaptation.

    • Main Results:

    • Early clamping leads to substantial neonatal blood volume shifts, unlike any other life event.
    • Inadequate blood volume can impede the transition to extrauterine life.
    • The proposed model highlights the critical role of blood volume in preventing hypovolemic and hypoxic complications.

    Conclusions:

    • Neonatal transition is fundamentally driven by adequate blood volume, not solely respiratory effort.
    • Early cord clamping is a detrimental practice that should be re-evaluated.
    • Maintaining neonatal blood volume is crucial for a successful and safe transition at birth.