What do you mean by congenital long qt syndrome, Biology

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Q. What do you mean by Congenital Long QT Syndrome?

There is a rare group of young patients who suddenly pass out due to a spontaneous ventricular tachycardia and often have family members who have died suddenly. An abnormality in the inward and outward transmembrane potential can trigger polymorphic ventricular tachycardia. At times these patients have a borderline QT interval at rest but exercise will usually resolve by a marked prolongation.

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