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l norepinephrine/hypoxia
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6 resultados
Effects of alpha adrenergic blockade and tissue catecholamine depletion on pulmonary vascular response to hypoxia.
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The highly reactive pulmonary vascular bed of the neonatal calf was utilized to determine whether the hypoxic pulmonary pressor response is modified by alpha-adrenergic blockade with phenoxybenzamine (Group A) or by tissue catecholamine depletion with reserpine (Group B). In addition, in Group A,
Enhanced heat production in physically restrained rats in hypoxia.
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Combined effects of restraint and hypoxia (9.5% O2 in N2) on heat production (M), heat loss (HL), colonic temperature (Tcol), and cardiovascular activity were studied in unanesthetized rats. In freely moving (F) rats, hypoxia decreased M, HL, Tcol, and heart rate (HR). In restrained (R) rats,
Diazoxide provides protection to human myocardium in vitro that is concentration dependent.
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BACKGROUND
Diazoxide has been shown to confer significant myocardial protection in many experiments. This study was designed to assess its influence on the structural injury and functional recovery of human myocardium subjected to hypoxia/reoxygenation in vitro.
METHODS
The isolated electrically
[Chemoreflexive drive of ventilation and noradrenaline stimulus in man].
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O2 chemoreflex drive of ventilation was studied before and after an intravenous infusion of L-norepinephrine (9 microgram/min), inducing a plasmatic hormone concentration similar to that obtained during submaximal exercise. The ventilation increasing rapidly at the beginning of the infusion was
Effects of ischemia on discontinuous action potential conduction in hybrid pairs of ventricular cells.
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BACKGROUND
Acute ischemia often occurs in cardiac tissue that has prior injury, resulting in spatially inhomogeneous distributions of membrane properties and intercellular coupling. Changes in action potential conduction with ischemia, which can be associated with release of catecholamines, may be
Hemodynamics, coronary blood flow, and myocardial metabolism in coronary shock; response of 1-norepinephrine and isoproterenol.
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Hemodynamics and myocardial metabolism were evaluated in 18 patients in cardiogenic shock following acute myocardial infarction. The response to l-norepinephrine was studied in seven cases and the response to isoproterenol in four cases. Cardiac index (CI) was markedly reduced, averaging 1.35
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