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1/31. Reversible cardiomyopathy after radiofrequency ablation of lateral free-wall pathway-mediated incessant supraventricular tachycardia.

    Incessant supraventricular tachycardia leading to reversible cardiomyopathy has been reported. Cardiomyopathy usually only develops after prolonged episodes of tachycardia at a significant heart rate. Left ventricular free-wall pathways rarely cause fast and incessant tachycardia. Therefore cardiomyopathy has not been reported with left ventricular free-wall pathway-mediated supraventricular tachycardia. We report on two cases of left ventricular free-wall-mediated supraventricular tachycardia leading to reversible cardiomyopathy after radiofrequency ablation. These cases illustrate the difficulty in diagnosing tachycardia-mediated cardiomyopathy, as the tachycardia may be clinically silent. In addition, they emphasize the importance of making this diagnosis, as the cardiomyopathy is reversible.
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keywords = cardiomyopathy
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2/31. troponin i elevation after supraventricular tachycardia in a child with hypertrophic cardiomyopathy.

    An 11-year-old patient with diagnosis of hypertrophic cardiomyopathy (HCM) developed marked elevation of troponin i in the absence of electrocardiographic signs of ischemia after two episodes of supraventricular tachycardia. At follow-up the level of troponin i returned to normal. The role of troponin i in patients with HCM as a risk marker deserves further evaluation.
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ranking = 0.55555555555556
keywords = cardiomyopathy
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3/31. Tachycardiomyopathies.

    heart failure is a common disease with major social and economic repercussions for the health system. All potentially curable or reversible causes of heart failure should be investigated and treated if possible. Several experimental and clinical studies have demonstrated that supraventricular tachycardias can induce a form of dilated cardiomyopathy (tachycardiomyopathy), which may be reversible with ventricular frequency response control. In this article we present a clinical case, and review this clinical entity, so often underdiagnosed.
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ranking = 0.22222222222222
keywords = cardiomyopathy
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4/31. Isolated noncompaction cardiomyopathy presenting with paroxysmal supraventricular tachycardia--case report and literature review.

    Isolated noncompaction cardiomyopathy is an exceedingly rare congenital cardiomyopathy. A case of isolated noncompaction cardiomyopathy is reported and the literature on the subject collected through a comprehensive literature search is reviewed. Fewer than 100 cases of this condition have been reported. Isolated noncompaction cardiomyopathy is caused by a defect in cardiac morphogenesis resulting in an arrest of compaction of loose interwoven meshwork of myocardial fibers during intrauterine life, which results in severe systolic dysfunction as well as undue hypertrophy of the involved walls of the ventricles. Although the most frequent sites involved are left ventricular apex and inferior wall, involvement of other left ventricular walls and right ventricle has also been reported. Etiology of the isolated noncompaction of myocardium is not clear. Familial cases have been reported and the mode of inheritance is heterogeneous. In X-linked form of the disease, a locus has been found on Xq28, and mutations have been reported in G4.5 gene. The age of onset of symptoms ranges from infancy to the geriatric age. patients with isolated noncompaction cardiomyopathy have a high incidence of heart failure, arrhythmias, and thromboembolism. The most common presentation is congestive heart failure. Arrhythmias include atrial arrhythmias, ventricular tachycardia, and sudden cardiac death. The patient reported in this article presented with paroxysmal supraventricular tachycardia. echocardiography is the procedure of choice to establish diagnosis. Due to the lack of associated cardiac anomalies, antenatal detection is difficult. The treatment is that for congestive heart failure, arrhythmias, and thromboembolism. The end-stage congestive heart failure is managed with heart transplantation and potential life-threatening ventricular tachyarrhythmias with an implantable cardioverter defibrillator. prognosis is poor and the common causes of death are intractable heart failure and sudden cardiac death.
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keywords = cardiomyopathy
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5/31. Twin brothers with MIDAS syndrome and XX karyotype.

    Twin brothers with microphthalmia, facial dermal hypoplasia, sclerocornea, and supraventricular tachycardia, are reported. Their clinical features are compatible with MIDAS syndrome, a known X-linked and hemizygous male lethal condition. Their karyotypes showed an XX sex chromosome modality with a subtle Xp/Yp translocation proven by the presence of SRY gene. The pregnancy was complicated with fetal supraventricular tachycardia, which was treated with digoxin prenatally. Postnatally, both twins required treatment with adenosine, digoxin, and propanolol to remain in normal sinus rhythm. The possible involvement of the heart, only in the form of cardiomyopathy with arrhythmia is emphasized. Both twins had a selective X-inactivation of the derivative chromosome X with Xp/Yp translocation.
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ranking = 0.11111111111111
keywords = cardiomyopathy
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6/31. Radiofrequency catheter ablation in drug refractory maternal supraventricular tachycardias in advanced pregnancy.

    BACKGROUND: Treatment of maternal tachyarrhythmias in pregnancy is a major clinical issue. Pharmacological treatment raises important concerns regarding partial efficacy and side effects. Radiofrequency ablation of arrhythmogenic substrate has rarely been performed during pregnancy because of the fetal risks related to x-ray exposure and potential fetomaternal procedural complications. CASES: Three women affected by supraventricular tachycardias refractory to pharmacological therapy underwent successful radiofrequency catheter ablation at 29 to 30 weeks' pregnancy. All patients had cesarean delivery of newborns with normal Apgar scores. CONCLUSION: Radiofrequency catheter ablation is an effective treatment of drug refractory maternal supraventricular tachycardias in advanced pregnancy. Further studies are required to establish its long-term fetal safety.
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ranking = 2.753714764693
keywords = arrhythmogenic
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7/31. Ventricular septal hamartoma mimicking hypertrophic cardiomyopathy in a 41-year-old woman presenting with paroxysmal supraventricular tachycardia.

    We report an unusual case of cardiac hamartoma involving the ventricular septum. The patient presented with palpitations and exertional chest pain. echocardiography indicated a large homogeneous mass occupying the superior two-thirds of the ventricular septum. This report confirms the use of transthoracic echocardiography as a screening tool in the diagnosis and management of an uncommon case of a benign cardiac tumor.
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ranking = 0.44444444444444
keywords = cardiomyopathy
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8/31. isotretinoin (13-cis-retinoic acid) associated atrial tachycardia.

    We describe a 16-year-old boy who presented with palpitations for 1 week while being on isotretinoin treatment for nodulocystic facial acne for 3 months. Twenty four-hour Holter monitoring showed frequent premature atrial beats and episodes of nonsustained atrial tachycardia. He never had any episodes of palpitations previously. His complaints almost disappeared within a week after stopping the treatment. He remained asymptomatic since the discontinuation of the drug. The temporal relationship between isotretinoin treatment and patient's symptoms in the presence of documented arrhythmia suggests a drug-related cause. As a result, clinicians should be aware of the possible arrhythmogenic effect of isotretinoin.
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ranking = 2.753714764693
keywords = arrhythmogenic
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9/31. Supraventricular tachycardia with a baseline ECG pattern of brugada syndrome.

    The typical arrhythmias found in patients with the brugada syndrome is either ventricular fibrillation or polymorphic ventricular tachycardia. We report the case of a patient who presented with supraventricular tachycardia accompanied by ECG features of the brugada syndrome (BrS) during both tachyarrhythmia and sinus rhythm. This case lends support to the recently reported association between supraventricular tachyarrhythmia and BrS and the hypothesis that the arrhythmogenic substrate in BrS is not limited to the ventricular level.
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ranking = 2.753714764693
keywords = arrhythmogenic
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10/31. Recovery of cardiac function after ablation of atrial tachycardia arising from the tricuspid annulus.

    tachycardia-induced cardiomyopathy is a reversible form of heart failure. An early diagnosis and an effective cure of the underlying tachycardia are crucial for a favorable outcome. Different kinds of atrial and ventricular arrhythmias may induce tachycardiomyopathy. Focal atrial tachycardia may be easily suppressed by means of transcatheter ablation. Relationships between focal atrial tachycardia and tachycardiomyopathy have not been deeply analyzed. In the present paper we report a case of a 76-year-old man with tachycardia-induced cardiomyopathy caused by recurrences of focal atrial tachycardia arising from the tricuspid annulus. The arrhythmia was successfully treated with transcatheter ablation. In the follow-up no recurrences of the arrhythmia occurred and a significant improvement in myocardial function was observed.
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ranking = 0.44444444444444
keywords = cardiomyopathy
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