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A: Calculation of change in QRST area for unipolar electrographic analysis. Stim, Stimulation. B: Five atrial regions in QRST analysis. RAA, right atrial appendage; LAA, left atrial appendage; SVC, superior vena cavae; IVC, inferior vena cavae; SRA, superior right atrium; IRA, inferior right atrium; SLA, superior left atrium, ILA, inferior left atrium, PLA, posterior left atrium.
