Transcription of Using the Surface Electrocardiogram to Localize the Origin ...
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Using the Surface Electrocardiogram to Localize the Origin ...
REVIEWU sing the Surface Electrocardiogram to Localize theOrigin of Idiopathic Ventricular TachycardiaKYOUNG-MIN PARK, , ,*, YOU-HO KIM, , , and FRANCIS E. MARCHLINSKI, From the*Department of Internal Medicine, Konkuk University Hospital, Konkuk University School of Medicine,Seoul, South Korea; Section of Cardiac Electrophysiology, Department of Medicine, Hospital of the University ofPennsylvania, Philadelphia, Pennsylvania; and Asan Medical Center, Department of Internal Medicine, Universityof Ulsan College of Medicine, Seoul, South KoreaThe Surface Electrocardiogram (ECG) is a useful tool to help identify the sites of Origin of ventriculartachycardia (VT). Despite such limitations as chest wall deformity and metabolic and drug effects, theanalysis of the QRS morphologic patterns and vectors can discern the site of activation of have been described numerous reports about ECG features of idiopathic left- and right-ventricularVT.
PARK, ET AL. Table I. Continued Localization Precordial of VT BBB Axis Transition V 1 V 6 I Other ECG Features PA LBBB Inferior > V 3 rS/QS R rS/QS 1 > aV L/aV R ratioofthe Q-wave amplitude, 1 < R/S ratioinleadV 2 TA Septal LBBB Inferior < V 3 QS R R/r Positive, isoelectric, or multiphasic in aV
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