A QTc above 500 ms triples the baseline risk of torsades de pointes — and most new PMHNPs cannot recite that number when asked. Two AI hosts walk through the 2026 protocol every PMHNP should run from memory: the three QTc thresholds (450 / 470 / 500 ms), the psychotropic risk hierarchy (IV haloperidol, ziprasidone, thioridazine, high-dose citalopram, methadone at the top; aripiprazole, sertraline, mirtazapine at the bottom), the polypharmacy stacking trap that quietly produces most outpatient torsades, and the four action levels — continue, dose-adjust + repeat, switch, or hold + cardiology. You will learn: (1) the three QTc tiers every PMHNP should run from memory before opening a chart; (2) the medication stack that quietly turns a clean baseline into a 500 ms reading; (3) the documentation phrasing that makes the chart defensible rather than dang ...