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torsades de pointes/hypoxia
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Pharmacological treatment of acquired QT prolongation and torsades de pointes.
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Torsades de pointes (TdP) is a characteristic polymorphic ventricular arrhythmia associated with delayed ventricular repolarization as evidenced on the surface electrocardiogram by QT interval prolongation. It typically occurs in self-limiting bursts, causing dizziness and syncope, but may
Simultaneous gene expression signature of heart and peripheral blood mononuclear cells in astemizole-treated rats.
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We investigated the effects of astemizole, a second-generation antihistamine, on the heart and peripheral blood mononuclear cells (PBMCs) and identified the early markers of its cardiotoxicity using gene expression profiling. Astemizole causes torsades de pointes, which is a type of ventricular
[Long QT syndrome presented as epilepsy].
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BACKGROUND
Long QT syndrome is characterised by an alteration in cardiac repolarisation that brings about ventricular arrhythmias. The resulting cerebral hypoxia leads to fainting and convulsions that, in up to 10% of cases, are interpreted as epilepsy.
METHODS
We report the case of a patient of
Ventricular tachycardia and prolonged QT interval presenting as seizure-like activity.
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Seizures can be difficult to distinguish from other causes of transient cerebral hypoxia in the emergency department. We present a case of seizure activity in a woman in whom EKG led to a diagnosis of intermittent monomorphic and polymorphic ventricular tachycardia (torsades de pointes),
[Evaluation of hyperkinetic cardiac arrhythmia in chronic obstructive bronchopneumopathy].
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Patients with chronic obstructive pulmonary disease (COPD), especially during acute exacerbations of their disease, show a greater incidence of cardiac arrhythmias than healthy subjects of the same age. The type of arrhythmias found may be supraventricular (premature atrial beats, paroxysmal
The cardiac persistent sodium current: an appealing therapeutic target?
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The sodium current in the heart is not a single current with a mono-exponential decay but rather a mixture of currents with different kinetics. It is not clear whether these arise from distinct populations of channels, or from modulation of a single population. A very slowly inactivating component,
Apelin shorten QT interval by inhibiting Kir2.1/IK1 via a PI3K way in acute myocardial infarction.
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QT interval prolongation and depolarization of resting membrane potential (RMP) were found in acute myocardial infarction (MI) which is involved in the arrhythmogenic mechanism and raising the risk to initiate torsade de pointes. However, clinical anti-arrhythmic agents that primarily act on QT
[Adenosine induces ventricular arrythmias in hearts with chronic chagas cardiomyopathy].
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Adenosine released during ischemia and hypoxia can induce ventricular arrhythmias. This phenomenon is also observed in Chagas disease. This study involved pharmacologic analysis of the arrhythmogenic properties of adenosine in healthy Sprague-Dawley rats (n=14) and in rats with chronic Chagas
Cardiac and electrocardiographical manifestations of acute organophosphate poisoning.
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BACKGROUND
To study the extent, frequency and pathogenesis of the cardiac and electrocardiographical manifestations of acute organophosphate poisoning.
METHODS
37 adult patients admitted over a three-year period with a diagnosis of acute organophosphate or carbamate poisoning were studied
Acute overdosage with thioridazine: a review of the available clinical exposure.
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Two hundred and twenty-three cases of acute overdosage associated with thioridazine were reviewed. The most frequent feature was impairment of consciousness which was linearly dose-related and occasionally resulted in life-threatening complications. Arrhythmia was the most frequently reported
In silico assessment of drug safety in human heart applied to late sodium current blockers.
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Drug-induced action potential (AP) prolongation leading to Torsade de Pointes is a major concern for the development of anti-arrhythmic drugs. Nevertheless the development of improved anti-arrhythmic agents, some of which may block different channels, remains an important opportunity. Partial block
The clinical significance of QT interval prolongation in anesthesia and pain management: what you should and should not worry about.
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The most feared drug-induced complication is fatal cardiac arrest. Torsades de pointes (TdP) is a polymorphic ventricular tachycardia occurring in the setting of a QT interval prolongation and is the most frequent type of drug-induced pro-arrhythmia. The most common mechanism of QT prolongation and
Arrhythmias and COVID-19: A Review
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Current understanding of the impact of coronavirus disease-2019 (COVID-19) on arrhythmias continues to evolve as new data emerge. Cardiac arrhythmias are more common in critically ill COVID-19 patients. The potential mechanisms that could result in arrhythmogenesis among COVID-19 patients include
The role of late I Na in development of cardiac arrhythmias.
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Late I Na is an integral part of the sodium current, which persists long after the fast-inactivating component. The magnitude of the late I Na is relatively small in all species and in all types of cardiomyocytes as compared with the amplitude of the fast sodium current, but it contributes
Prolonged QT Interval in a Patient With Coronavirus Disease-2019: Beyond Hydroxychloroquine and Azithromycin
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Recent reports have suggested an increased risk of QT prolongation and subsequent life-threatening ventricular arrhythmias, particularly torsade de pointes, in patients with coronavirus disease-2019 (COVID-19) treated with hydroxychloroquine and azithromycin. In this article, we report the case of a
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