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Heart rate (HR) changes owing to sedation and isoproterenol (ISP). After the initiation of sedation, average HR decreased from 70 to 54 bpm. Patients whose tachycardia could not be induced received ISP, and the average HR had increased to 91 bpm at the time of PSVT induction. Note that average HR at PSVT induction is higher than that before sedation
