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Effects of hypoxia, calcium, carbachol, atropine and tetrodotoxin on the filling of the in-vitro rabbit whole bladder.
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OBJECTIVE
The urinary bladder stores urine at low intravesical pressure and empties the urine efficiently and completely. Bladder compliance is the property that allows the bladder to fill to near capacity without a large increase in intravesical pressure. The current study utilized an in vitro
Influence of atropine on arterial oxygen tension, acid-base status and tissue hypoxia in the conscious horse.
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[Importance of cardiac monitoring control in the diagnosis of chronic fetal hypoxia using the atropine test during pregnancy].
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[Study on the effect of inhalation of an atropine derivative on the pulmonary circulation during hypoxia (author's transl)].
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Dynamic circulatory responses to halothane inhalation, hypercapnia and hypoxia in sympathectomized and atropine-propranolol pretreated dogs.
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ATROPINE AND HYPOXEMIA.
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Hypoxia-induced inhibition of calcium channels in guinea-pig taenia caeci smooth muscle cells.
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1. The effects of hypoxia on whole-cell current in single smooth muscle cells and on a high K(+)-induced contraction of strips of the guinea-pig taenia caeci were studied. 2. In physiological salt solution (PSS) and K(+)-based pipette solution, hypoxia (PO2 = 20 mmHg) reversibly inhibited both the
Effect of hypoxia on respiratory system impedance in dogs.
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The effects of hypoxia on lung and airway mechanics remain controversial, possibly because of the confounding effects of competing reflexes caused by systemic hypoxemia. We compared the effects of systemic hypoxemia with those of unilateral alveolar hypoxia (with systemic normoxemia) on unilateral
Effects of naloxone on fetal circulatory responses to hypoxemia.
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The effects of opiate receptor antagonism on the fetal cardiovascular response to hypoxemia were examined by means of the radionuclide-labeled microsphere technique. Heart rate, blood pressure, and cardiac output were measured during baseline periods, during hypoxemia, and before and after infusion
Stimulation of tracheal slowly adapting stretch receptors by hypercapnia and hypoxia.
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We studied the response of tracheal slowly adapting stretch receptors (SARs), whose activity was recorded from the peripheral cut end of the right vagus nerve, in newborn and adult dogs during hyperoxic hypercapnia and isocapnic hypoxia. Tracheal receptors only were studied since it was possible to
Influence of vagal activity on the neonatal ventilatory response to hypoxemia.
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The sustained increase in ventilation (V1) that occurs during acute hypoxemia in adults is not characteristic of the neonate as V1 falls to or below baseline values soon after onset of the hypoxic stimulus. Associated with this decline in V1 is a decrease in tidal volume, lung compliance,
Effect of dinitrophenol and anoxia on isometric tension in rabbit colon smooth muscle.
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In a previous study, it was suggested that inhibition of oxidative phosphorylation in smooth muscle is accompanied by a release of Ca2+ from mitochondria (Pettersson 1983); in this investigation, the effects of 2,4-dinitrophenol (DNP) and anoxia on isometric tension in pieces of smooth muscle from
Differential effects of CO2 and hypoxia on bronchomotor tone in the newborn dog.
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We compared the effects of hypoxia and hypercapnia on pulmonary mechanics in the newborn dog. Animals were anesthetized with a mixture of chloralose/urethane, paralyzed and ventilated with the chest open. Following an inflation to control volume history, mean inspiratory resistance (RLi) and dynamic
Systemic hypoxia activates a coronary vasoconstrictor reflex response that is blocked by prazosin.
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We assessed the presence of an alpha 1-adrenoceptor-mediated coronary vasoconstrictor reflex response during acute systemic hypoxia in eight chloralose-anesthetized dogs. We avoided local vasodilator responses to myocardial and coronary hypoxia and to circulating factors by perfusing the left common
Umbilical artery flow velocity waveforms during acute hypoxemia and the relationship with hemodynamic changes in the fetal lamb.
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The contributions of the variables of the fetal circulation to changes in the pulsatility index of the umbilical artery flow velocity waveform have not been assessed. Acute fetal hypoxemia was induced by 60 to 90 seconds of total occlusion of the maternal common internal iliac artery in six sheep.
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