that occurs from any of these mechanisms produces either ventricular fibrillation or electromechanicaldissociation. In those with previous syncope, the severe ischemia might have produced transient ventriculartachycardia or fibrillation or else suddenly impaired ventricular function might have decreased cardiac outputcatastrophically. Why some patients with apparently identical anomalies survive without ischemia until their 70sand 80s is unknown.
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