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- W2078633223 abstract "Abstract Although positive pressure ventilation and lung hyperinflation are known to produce changes in blood pressure, cardiac output and heart rate, little information is available about the effects of these procedures on peripheral blood flow in specific tissues. This study examined the reflex effects per se induced by lung hyperinflation in a heterogenous vascular bed (hindlimb), a cutaneous vascular bed (paw) and skeletal muscle (gracilis muscle) of anesthetized dogs. Each of the 3 vascularly isolated preparations employed constant blood flow perfusion, thereby excluding the effects of humoral substances. Invariably, lung hyperinflation produced reflex vasodilatation in the hindlimb and paw but produced consistent vasoconstriction in skeletal muscle. This differential reflex response also occurred when the vascularly isolated, innervated, separately ventilated and reservoir-perfused left lower pulmonary lobe was hyperinflated, thus demonstrating a persistence of the reflex response in the absence of mechanical interference with return of blood to the heart. With constant sinoaortic baroreceptor activity, lung hyperinflation still resulted in vasoconstriction of skeletal muscle. In addition, it was demonstrated that the reflex vasoconstriction in skeletal muscle initiated by lung hyperinflation could override the effects of increased carotid sinus pressure. These data indicate that reflex vasoconstriction in the large mass of skeletal muscle may provide an important means for maintaining the integrity of the circulation during the general cardiovascular depression that occurs with increased airway pressure." @default.
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- W2078633223 date "1972-05-01" @default.
- W2078633223 modified "2023-09-27" @default.
- W2078633223 title "Reflex regulation of peripheral blood flow during lung hyperinflation" @default.
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- W2078633223 doi "https://doi.org/10.1016/0002-9149(72)90166-x" @default.
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