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The transitional circulation: physiology and anesthetic implications.

W R Clarke1

  • 1Department of Anesthesiology, University of Washington School of Medicine, Seattle, WA 98195.

Journal of Clinical Anesthesia
|May 1, 1990
PubMed
Summary
This summary is machine-generated.

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The transitional circulation in newborns is a complex, phased process. Understanding its normal function and failure is crucial for treating infant hypoxia caused by high pulmonary vascular resistance (PVR).

Area of Science:

  • Neonatal Physiology
  • Cardiovascular Physiology

Background:

  • The transitional circulation in newborns is a critical period involving significant physiological adjustments.
  • Pulmonary vascular resistance (PVR) plays a key role in this transition, with several mechanisms influencing its regulation.

Purpose of the Study:

  • To elucidate the physiology of the transitional circulation.
  • To understand the mechanisms controlling PVR during this phase.
  • To investigate the causes and management of failed transitional circulation.

Main Methods:

  • Review of physiological mechanisms governing transitional circulation.
  • Analysis of factors contributing to high PVR in infants.
  • Discussion of clinical strategies for managing failed transitional circulation.

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Main Results:

  • Transitional circulation is a phased process, not a single event.
  • High PVR leads to right-to-left shunting and hypoxia in infants with failed transition.
  • Clinical management focuses on decreasing PVR and increasing systemic vascular resistance (SVR).

Conclusions:

  • Further research is needed to fully understand normal and abnormal transitional circulation.
  • Effective management of failed transitional circulation requires simultaneous manipulation of PVR and SVR.
  • Awareness of the dynamic nature of these processes is vital for infant care.