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Alternation in ST segment appearance ( or in the amount of ST elevation or depression ) — is often linked to ischemia. Repolarization Alternans — entails beat-to-beat variation in the ST segment and/or T wave. Regardless of whether the mechanism of the regular SVT is AVNRT or AVRT — it is likely that reentry is involved.
The second most common cause of medical cardiac tamponade is acute idiopathic pericarditis. Less common etiologies include uremia, bacterial or tubercular pericarditis, chronic idiopathic pericarditis, hemorrhage, and other causes such as autoimmune diseases, radiation, myxedema, etc.
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