Mean and variability of QT-interval: Relevance to psychiatric illness and psychotropic medication.

We have recently shown that intravenous Isoproterenol and a change from supine to standing posture produce a highly significant increase in QTvi, thus linking it to an increase in sympathetic activity.[ 10 ] We have also found that pemoline and yohimbine, which are sympathomimetic agents, can increase QTvi, which links this index to an increase in sympathetic activity.[ 11 12 ] We have found that patients with panic disorde

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