Analysis of depolarization abnormality and autonomic nerve function after stereotactic body radiation therapy for ventricular tachycardia in a patient with old myocardial infarction

Figures

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  Figure 1. Electrophysiological findings. A: Chest radiograph with implantable cardioverter-defibrillator insertion and mild cardiac enlargement. B, C: Two types of clinical ventricular tachycardia (VT). D, E: Induced VTs and pace map morphology differed from clinical VTs. F: Multiple VT exits, and pace map site marked in the border zone of the endocardial voltage map. ATP = antitachycardia pacing; DC = direct current; LPO = left posterior oblique view; RAO = right anterior oblique view.

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  Figure 2. Radiation treatment plan. A: Target and non-target areas. B: Cardiac computed tomography (CT) with positron emission CT (PET) fusion images is used for contouring. C: Breathing instruction and treatment without anesthesia and pain-free conditions. LPO = left posterior oblique view.

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  Figure 3. Sympathetic activity. 123I-metaiodobenzylguanidine scintigraphy before and after treatment. The difference between early and delayed (3 hours later) phase provided the mismatch image. Washout images were created by dividing the mismatch image by the early-phase image.