priapism/أرجنين

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Resolution of Acute Priapism in Two Children With Sickle Cell Disease Who Received Nitrous Oxide.

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BACKGROUND

Nitrous oxide (N O) is an inhalational medication that has anxiolytic, amnestic, potent venodilatory and mild-to-moderate analgesic properties commonly used in the emergency department (ED) setting. N₂ O has a rapid onset of action (<5 minutes) and

Hematologic, biochemical, and cardiopulmonary effects of L-arginine supplementation or phosphodiesterase 5 inhibition in patients with sickle cell disease who are on hydroxyurea therapy.

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OBJECTIVE Fetal hemoglobin (HbF) induction involves NO-cGMP signaling pathways. L-arginine, an NO precursor, and the phosphodiesterase (PDE) 5 inhibitor sildenafil, which potentiates cGMP, were studied in adults with sickle cell disease (SCD) who were stably on HU. METHODS Twenty four courses of

The investigation of putative agents, using an in vitro model, to prevent cavernosal smooth muscle dysfunction during low-flow priapism.

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OBJECTIVE To investigate the effect of putative agents for preventing irreversible smooth muscle dysfunction, using an in vitro model of low-flow priapism (a condition conventionally managed using a combination of corporal blood aspiration and instillation of alpha-adrenergic agonists), as failure

Case report: Avoidance of palpable corporal fibrosis due to priapism with upregulators of nitric oxide.

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BACKGROUND Recent evidence suggests that blocking inducible nitric oxide (NO) synthase in the penis may exacerbate fibrotic processes and that application of medications known to increase NO in tissues may prevent fibrosis. OBJECTIVE To report the use of an antifibrotic regimen consisting of

Lactate dehydrogenase as a biomarker of hemolysis-associated nitric oxide resistance, priapism, leg ulceration, pulmonary hypertension, and death in patients with sickle cell disease.

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Pulmonary hypertension is prevalent in adult patients with sickle cell disease and is strongly associated with early mortality and markers of hemolysis, in particular, serum lactate dehydrogenase (LDH). Intravascular hemolysis leads to impaired bioavailability of nitric oxide (NO), mediated by NO

Altered contractile response of penis under hypoxia with metabolic acidosis.

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Previous studies concerning ischemic priapism revealed that hypoxia alters the erectile and contractile responses of penis. But the effects of accompanying acidosis on those responses have not been fully evaluated or understood yet. We performed this study to elucidate the role of acidosis on the

Comparative tolerability and efficacy of treatments for impotence.

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Modern pharmacological treatment of impotence is determined by the presenting symptoms. Since this involves symptomatology with a heterogenous aetiology, many different drugs are involved in the treatment of impotence. Drugs used for libido and arousal problems include testosterone, yohimbine,

Mechanisms of vasculopathy in sickle cell disease and thalassemia.

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Many mechanisms contribute to the complex pathophysiology of sickle cell disease (SCD), with dysfunction of the vascular endothelium as a unifying theme. Specifically, hemolysis-associated low arginine and nitric oxide (NO) bioavailability, amplified by NO synthase uncoupling, elevated arginase

Nonadrenergic, noncholinergic relaxation of human isolated corpus cavernosum induced by scorpion venom.

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OBJECTIVE To examine the effects of Tityus serrulatus scorpion venom (TSV) on human corpus cavernosum (HCC) using a bioassay cascade. Priapism is occasionally observed in scorpion envenomation, mostly in children. METHODS HCC strips were suspended in a cascade system and superfused with aerated and

Sickle cell disease at the dawn of the molecular era.

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Recent investigations have identified a syndrome of hemolysis-associated vasculopathy in patients with sickle cell disease (SCD), which features severe hemolytic anemia that leads to scavenging of nitric oxide (NO) and its biochemical precursor arginine. This diminished bioavailability of NO

Erection induced by Tx2-6 toxin of Phoneutria nigriventer spider: expression profile of genes in the nitric oxide pathway of penile tissue of mice.

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The peptides Tx2-5 and Tx2-6, isolated from the whole venom of "armed-spider"Phoneutria nigriventer venom, are directly linked with the induction of persistent and painful erection in the penis of mammals. The erection induced by Tx2-6 has been associated with the activation of nitric oxide

Increased cavernosal relaxation by Phoneutria nigriventer toxin, PnTx2-6, via activation at NO/cGMP signaling.

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Erectile dysfunction (ED) mechanisms in diabetic patients are multifactorial and often lead to resistance to current therapy. Animal toxins have been used as pharmacological tools to study penile erection. Human accidents involving the venom of Phoneutria nigriventer spider are characterized by

The role of nitric oxide in vivo feline erection under hypoxia.

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Previous in vitro studies have demonstrated that the cavernous relaxation under hypoxia does not involve the endothelium dependent mechanism. However, the mechanism of nitric oxide pathway under hypoxia are not fully evaluated or understood yet in vivo. The changes of intracavernous pressure to

Novel small molecule therapeutics for sickle cell disease: nitric oxide, carbon monoxide, nitrite, and apolipoprotein A-I.

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A hemolysis-linked subphenotype of sickle cell disease (SCD), characterized by pulmonary hypertension, stroke, priapism and leg ulcers, is associated with decreased nitric oxide bioavailability and vasculopathy. Vasculopathy appears to have a multifactorial etiology, including mechanisms primarily

Post-translational inactivation of endothelial nitric oxide synthase in the transgenic sickle cell mouse penis.

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BACKGROUND Sickle cell disease (SCD)-associated priapism is characterized by endothelial nitric oxide synthase (eNOS) dysfunction in the penis. However, the mechanism of decreased eNOS function/activation in the penis in association with SCD is not known. OBJECTIVE Our hypothesis in the present

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