myocardial stunning/hypoxia

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Protection from myocardial stunning by ischaemia and hypoxia with the adenosine A3 receptor agonist, IB-MECA.

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Guinea pig isolated working hearts were exposed to 30-min ischaemia by reducing coronary flow to 10%, followed by reperfusion. Aortic output fell to 4.5+/-4.5% of the pre-ischaemic value at reperfusion, recovering to 48.2+/-14.6% at 20-min post-reperfusion; the index of myocardial stunning. IB-MECA

Effects of endogenous adenosine and adenosine receptor agonists on hypoxia-induced myocardial stunning in Guinea-pig atria and papillary muscles.

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The effects of endogenous adenosine and adenosine receptor agonists were examined on hypoxia-induced myocardial stunning of guinea-pig isolated paced left atria and papillary muscles. Hypoxia (30 minutes) reduced developed tension and increased diastolic tension (contracture) of left atria (41.8 +/-

Non-invasive ventilation for severe TRALI and myocardial stunning: report and literature review.

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Transfusion-related acute lung injury (TRALI) is a frequently under-diagnosed, although potentially fatal, condition that represents a leading cause of transfusion-related morbidity and mortality even in pediatric patients. Its main clinical features are characterized by rapidly evolving respiratory

Felodipine protects human atrial muscle from hypoxia-reoxygenation dysfunction: a force-frequency relationship study in an in vitro model of stunning.

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OBJECTIVE We aimed at investigating contractile changes after hypoxia-reoxygenation and dobutamine challenge in superfused human atrial pectinate muscle to see whether high versus low stimulation rate during hypoxia might account for outcome differences compatible with the definition of an in vitro

The risk of myocardial stunning is decreased concentration-dependently by KATP channel activation with nicorandil before high K+ cardioplegia.

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BACKGROUND Drug-induced opening of the adenosine triphosphate-sensitive potassium channel (KATP) during hypoxia and/or ischemia, achieved significant myocardial protection in several in vitro and in vivo models. Pretreatment with KATP openers simulated preconditioning and thus enhanced recovery from

Effects of endothelin-1 in the isolated heart in ischemia/reperfusion and hypoxia/reoxygenation injury.

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The effects of the vasoconstrictor peptide endothelin-1 were examined in the isolated heart during hypoxia, reoxygenation and reperfusion. Isovolumic rat hearts were perfused with Krebs-Henseleit buffer at constant pressure. Cumulative dose-response curves were obtained for endothelin-1 boluses of

Mitochondrial response to heart rate steps in isolated rabbit heart is slowed after myocardial stunning.

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The oxidative capacity of mitochondria isolated from myocardium is undiminished after myocardial stunning, which is remarkable because stunning affects many other cellular functions. The aim of the present study was to assess the mitochondrial oxidative response in intact rather than isolated

Adenosine triphosphate-dependent potassium channel modulation and cardioplegia-induced protection of human atrial muscle in an in vitro model of myocardial stunning.

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OBJECTIVE Although adenosine triphosphate-dependent potassium channel openers have been shown to enhance cardioplegic protection in animal myocardium, there is a lack of data on human cardiac tissues. We aimed at determining, on human atrial muscle, whether adenosine triphosphate- dependent

Kinetics of a putative hypoxic tracer, 99mTc-HL91, in normoxic, hypoxic, ischemic, and stunned myocardium.

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99mTc-4,9-diaza-3,3,10,10-tetramethyldodecan-2,11-dione dioxime (HL91) was developed as a putative hypoxic reagent. This study focused on the myocardial kinetics of 99mTc-HL91 in various oxygen levels and perfusion states. METHODS The time-activity curve of 99mTc-HL91 was measured in isolated

Effect of fetal hypoxia on heart susceptibility to ischemia and reperfusion injury in the adult rat.

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OBJECTIVE Epidemiologic studies showed an association between adverse intrauterine environment and ischemic heart disease in the adult. We tested the hypothesis that prenatal hypoxia increased the susceptibility of adult heart to ischemia-reperfusion (I-R) injury. METHODS Time-dated pregnant rats

Neutrophils delay functional recovery of the post-hypoxic heart of the rabbit.

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A postischemic contractile dysfunction termed myocardial stunning has been described in vivo and is attributed, in part, to the generation of oxygen-derived free radicals and the presence of neutrophils. An analogous contractile derangement occurs in the posthypoxic heart in vitro. This study

[Prognostic implications of stone heart syndrome in cardiac arrest]

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The stone heart syndrome is defined as an ischemic systolic contracture of the heart and also termed contractile cardiac arrest. It was first described in 1972 by the American cardiac surgeon Denton Cooley, who observed this phenomenon during bypass surgery. It is mostly the result of prolonged

Tuning cardiac performance in ischemic heart disease and failure by modulating myofilament function.

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The cardiac myofilaments are composed of highly ordered arrays of proteins that coordinate cardiac contraction and relaxation in response to the rhythmic waves of [Ca(2+)] during the cardiac cycle. Several cardiac disease states are associated with altered myofilament protein interactions that

Dynamic changes in cardiac fatty acid metabolism in the stunned human myocardium.

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BACKGROUND The chronological changes or mechanisms in cardiac fatty acid metabolism under clinical conditions of hypoxia and ischemia have not been fully elucidated. 123-15-(p-iodophenyl)-3-R,S-methylpentadecanoic acid (BMIPP) can be used with single photon emission computed tomography (SPECT) to

[Myocardial injury in carbon monoxide poisoning].

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Carbon monoxide (CO) intoxication is the most common cause of accidental poisoning in developed countries and, although most published data relate to its neurological manifestations, it often leads to cardiac damage. Myocardial hypoxia due to the formation of carboxyhemoglobin is not enough to

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