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Bloqueo aurículo-ventricular de primer grado en tirotoxicosis agudaKeywords: thyrotoxicosis, atrio-ventricular block, cardiovascular manifestations, ekg changes. Abstract: thyrotoxicosis may present with a variety of cardiovascular symptoms. sinus tachycardia is the most frequently encountered electrocardiographic abnormality and conduction disturbances are extremely uncommon. we present a case of first degree atrio-ventricular block in a patient with newly diagnosed hyperthyroidism and discuss the underlying pathophysiological mechanisms and the clinical implications from the internist?s standpoint.
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