Effect of central adenosine on brainstem blood flow in fetal sheep

JM Bissonnette, AR Hohimer, SJ Knopp

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Abstract

The effect of the adenosine analogue R‐N6‐(phenylisopropyl)adenosine (R‐PIA) on blood flow to the medulla and pons was examined in unanaesthetized fetal sheep. Microspheres labelled with isotopes were used to determine blood flow before and after instillation of 0.2 or 0.5 microgram R‐PIA into the cerebrospinal fluid of the fourth ventricle. Blood flow to the medulla, which had a mean value (+/− S.E.M.) of 285 +/− 41 ml min‐1 (100 g)‐1 during the control period, was not changed by the central instillation of R‐PIA. Blood flow to the pons was also not affected. These data indicate that central adenosine, which depresses respiratory drive in fetal sheep, acts by mechanisms independent of removal of carbon dioxide from the brainstem.

Original languageEnglish (US)
Pages (from-to)141-145
Number of pages5
JournalExperimental physiology
Volume80
Issue number1
DOIs
StatePublished - Jan 1 1995

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ASJC Scopus subject areas

  • Physiology
  • Nutrition and Dietetics
  • Physiology (medical)

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