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- W2088336280 abstract "The relative importance of centrally mediated reflex responses versus the release of circulating humoral substances in the heart's response to acute hypoxia was studied in the transplanted human heart with its residual innervated recipient atrium and denervated donor atrium. The sinus node rates of both the donor and recipient atria were compared by monitoring P wave activity on the standard electrocardiogram in six patients during control and hypoxic conditions. Breathing 13 per cent oxygen for 10 minutes resulted in an average oxygen saturation of 75 per cent and an oxygen tension (pO2) of 40 mm Hg, and was associated with a 16 per cent (p 0̌.05) increase in the recipient sinus node rate, but with no change in the donor sinus node rate. Pretreatment with atropine abolishes this increase in the innervated recipient sinus node. Breathing 10 per cent oxygen resulted in an oxygen saturation of 55 per cent and a pO2 of 25 mm Hg, with an associated 10 per cent increase in both donor and recipient sinus node rate. These studies indicate that changes in heart rate during mild degrees of hypoxemia are mediated by a central reflex mechanism which leads to the release of normal vagal parasympathetic tone. The increase in heart rate that occurs in both the innervated and denervated sinus node rates during more severe degrees of hypoxia is probably due to the release of circulating humoral substances, since reinnervation has not been documented in the human cardiac allograft." @default.
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- W2088336280 date "1974-04-01" @default.
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- W2088336280 title "Studies on circulatory response to hypoxia in the denervated transplanted human heart" @default.
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- W2088336280 doi "https://doi.org/10.1016/0002-9343(74)90479-3" @default.
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