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Mechanism of Oxygen Induced Contraction of Ductus Arteriosus

  • Fredric S. Fay
  • Pankajam Nair
  • William J. Whalen
Chapter
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 78)

Abstract

The ductus arteriosus is a wide muscular artery that connects the aorta and pulmonary artery allowing blood ejected by the right ventricle to by-pass the non-functional pulmonary bed in utero. Shortly after birth, the ductus constricts due to the contraction of its smooth muscle. Numerous investigators (1,2,3,4) have drawn attention to the postnatal increase in arterial oxygen pressure as a stimulus for muscular closure of the ductus arteriosus. Although other agents may act to constrict the vessel in vivo(1,3,5,6,7,8) increased oxygen pressure appears to be the major factor responsible for closure of the ductus at birth. The studies described here represent an attempt to understand the mechanism underlying the constrictor effect of oxygen on this blood vessel. All of the studies have been performed on the ductus arteriosus of the neonatal guinea pig mounted for isometric measurement of force in an organ bath.

Keywords

Oxygen Pressure Contractile Response Muscle Tension Organ Bath Polygraph Record 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • Fredric S. Fay
    • 1
  • Pankajam Nair
    • 2
  • William J. Whalen
    • 2
  1. 1.Department of PhysiologyUniversity of Massachusetts Medical SchoolWorcesterUSA
  2. 2.St. Vincent Charity HospitalClevelandUSA

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