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- W2021017568 abstract "The central effects of the adenosine analogue l-2-N6-(phenylisopropyl) adenosine (l-PIA) on breathing movements was determined by making injections into the fourth ventricle in unanesthetized fetal sheep. Administration of 0.5 μg l-PIA reduced the percent time during which fetal breathing occurred from 48.0 ± 5.2 (SEM) to 19.5 ± 6.1. Inspiratory slope was reduced to 62 ± 5.5 and 43 ± 5.7 percent of the control values when 0.2 and 0.5 μg l-PIA were given respectively. The effects of l-PIA on the percent time fetal breathing movements occurred and on inspiratory slope were prevented by the prior systemic administration of theophylline (plasma concentrations ∼15 μg/ml). When the vehicle for l-PIA, dimethyl sulfoxide in Ringer solution was given into the fourth ventricle or when 0.5 μg l-PIA was given systemically, there was no effect on fetal breathing. None of these protocols resulted in a change in sagittal sinus blood pH, PO2 or, PCO2. These data indicate adenosine acts at the brain stem to depress fetal respiratory drive." @default.
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- W2021017568 date "1991-05-01" @default.
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- W2021017568 title "The effect of centrally administered adenosine on fetal breathing movements" @default.
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- W2021017568 doi "https://doi.org/10.1016/0034-5687(91)90123-z" @default.
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