Cardiac resynchronization therapy in coronary sinus atresia delivered using leadless endocardial pacing Dewi E. Thomas, MD, MRCP, Nicholas M. Child,

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Cardiac resynchronization therapy in coronary sinus atresia delivered using leadless endocardial pacing Dewi E. Thomas, MD, MRCP, Nicholas M. Child, PhD, FRCP, W. Andrew Owens, MD, FRCS(CTh), Nicholas J. Linker, MD, FHRS, Simon A. James, MBChB, MRCP, Andrew J. Turley, MBChB, FRCP HeartRhythm Case Reports Volume 2, Issue 5, Pages 432-435 (September 2016) DOI: 10.1016/j.hrcr.2016.06.010 Copyright © 2016 Heart Rhythm Society Terms and Conditions

Figure 1 (A) Computed tomography and volume-rendered image of the inferior surface of the heart documenting complete absence of the right atrial ostium of the coronary sinus (CS). LA = left atrium; LV = left ventricle; RA = right atrium; RV = right ventricle. (B) Volume-rendered images from left lateral and oblique projections demonstrating a persistent left superior vena cava communicating with the innominate vein, and an absence of any first-order posterolateral veins. HeartRhythm Case Reports 2016 2, 432-435DOI: (10.1016/j.hrcr.2016.06.010) Copyright © 2016 Heart Rhythm Society Terms and Conditions

Figure 2 Anterior (A) and lateral (B) fluoroscopic projections demonstrating the components of the WiCS-LV system in situ. HeartRhythm Case Reports 2016 2, 432-435DOI: (10.1016/j.hrcr.2016.06.010) Copyright © 2016 Heart Rhythm Society Terms and Conditions

Figure 3 Time to peak systolic strain for basal and mid–left ventricular segments depicted before (A) and after implantation of the WiCS-LV system (B). Note the uniformity in segmental timing of peak strain following resynchronization, and the increase in overall circumferential strain values. SAX = short axis; B = basal; M = mid; C.strain = circumferential strain. HeartRhythm Case Reports 2016 2, 432-435DOI: (10.1016/j.hrcr.2016.06.010) Copyright © 2016 Heart Rhythm Society Terms and Conditions