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Volume 6, Issue 6, Pages 742-748 (June 2009) Temporary leadless pacing in heart failure patients with ultrasound-mediated stimulation energy and effects on the acoustic window Kathy L. Lee, MBBS, Hung-Fat Tse, MD, PhD, Debra S. Echt, MD, FHRS, Chu-Pak Lau, MD, FHRS Heart Rhythm Volume 6, Issue 6, Pages 742-748 (June 2009) DOI: 10.1016/j.hrthm.2009.02.025 Copyright © 2009 Heart Rhythm Society Terms and Conditions

Figure 1 Fluoroscopic appearance (left anterior oblique view) of the receiver electrodes (arrows) on the delivery catheter positioned endocardially on the lateral wall of the left ventricle in 1 patient. Heart Rhythm 2009 6, 742-748DOI: (10.1016/j.hrthm.2009.02.025) Copyright © 2009 Heart Rhythm Society Terms and Conditions

Figure 2 An example of clinically determined acoustic windows in 4 body positions (in red with the patient lying supine; in green with 30° right tilt; in yellow with 30° left tilt; in purple with 30° upright tilt) superimposed on the CT-determined acoustic window (in light blue with the patient lying supine and during end inspiration) on 3D reconstruction CT of the thorax. 3D = three-dimensional; CT = computed tomography. Heart Rhythm 2009 6, 742-748DOI: (10.1016/j.hrthm.2009.02.025) Copyright © 2009 Heart Rhythm Society Terms and Conditions

Figure 3 An example of changes in acoustic windows obtained by computed tomography of the thorax with various body positioning and respiratory phrases. A: Acoustic window in green when the patient was lying supine and during end inspiration. B: Acoustic window in red during end inspiration when the patient was lying on the right side. C: Acoustic window in black during end expiration when the patient was lying on the right side. Heart Rhythm 2009 6, 742-748DOI: (10.1016/j.hrthm.2009.02.025) Copyright © 2009 Heart Rhythm Society Terms and Conditions