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Essential Cardiac Electrophysiology Self Assessment - Part 5

Các tính năng AVRT đề nghị Preexcitation Tăng cường cơ sở đo điện tâm đồ VA 20 phần nghìn giây với BBB lệch tâm nhĩ kích hoạt trong phản ứng Extranodal SVT nhịp của ông Trên ngừng của VA nhịp đầu tiên tương tự như kích hoạt tiếp theo lệch tâm VA của A trong thời gian V nhịp cùng là đáp ứng SVT | Table 5.2 Differential diagnostic features of AVRT AVNRT and atrial tachycardia AVRT AVNRT Atrial tachycardia Atypical AVNRT Features that suggest Preexcitation on baseline EKG Increase VA 20 milliseconds with BBB Eccentric atrial activation during SVT Extranodal response to His pacing On cessation ofA pacing firstVA same assubsequentVA Eccentric activation of A during V pacing same as SVT AV response on termination of V pacing Atrial preexcitation with PVC when His refractory SVT terminates with A HA is constant during tachycardia Termination by PVC when His is refractory without retrograde A Features that exclude Septal VA 70 milliseconds AV block during SVT No VA conduction at baseline VA block CL during V pacing longer than SVTCL A activation different during V pacing then SVT AAV response on cessation of V pacing Induction dependent on critical AH interval Dual AVN physiology Septal VA 70 milliseconds AV block during SVT Earliest atrial activation away from AV groove VA dissociation during rapid V pacing Concentric activation of A during SVT On cessation ofA pacing firstVA same as subsequentVA Concentric activation of A during V pacing same as SVT AV response on termination of V pacing No atrial preexcitation with PVC when His refractory SVT terminates with A HA is constant during tachycardia Shortening of VA with BBB if HV prolongs A activation during V pacing different then SVT On cessation of A pacing first VA variable VA block CL during V pacing longer than SVT CL AAV response on cessation ofV pacing No atrial preexcitation with PVC when His refractory Tachycardia terminates with V not A HA may be variable during tachycardia Shortening of VA with BBB if HV prolongs Increase VA with BBB Termination by PVC when His refractory Earliest atrial activation away from AV groove Atrial preexcitation with PVC when His refractory Eccentric activation of A during V pacing same as SVT AAV response on cessation of V pacing Termination with AV block Induction dependent .