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pci complications sudden death icd contrast aalergy coronary perforation cin contrast nephropathy protamine allergy pacemaker lead extraction ppt new cocepts of pacemakers pacemakers syncope neurocardiogenic syncope rate drope syncope heart failure guideline for the management of heart failure cto managment cto ppt cto sudden cardiac arrest vt arvd dilated right ventricle hocm esc 2017 guidelines mi tratment guidelines myocardial infaction small vessel cpi pci