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Key Points Posteroseptal accessory pathways (APs) are not true septal pathways but are located in the complex inferior pyramidal space involving the right atrium, right ventricle, left ventricle, left atrium, and coronary sinus and its branches. Mapping often needs to…

Additional content is available online at Elsevier eBooks for Practicing Clinicians Cardiac implantable electrical devices (CIEDs) refer to implanted devices that deliver therapeutic electrical stimuli and include permanent pacemakers and implantable cardioverter-defibrillators (ICDs). Types of Devices Electrical therapy for cardiac…