Protecting the right phrenic nerve during catheter ablation: Techniques and anatomical considerations Stephen Stark, MD, David K. Roberts, MD, Thomas.

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Presentation transcript:

Protecting the right phrenic nerve during catheter ablation: Techniques and anatomical considerations Stephen Stark, MD, David K. Roberts, MD, Thomas Tadros, MD, James Longoria, MD, Subramaniam C. Krishnan, MD, FHRS HeartRhythm Case Reports Volume 3, Issue 4, Pages 199-204 (April 2017) DOI: 10.1016/j.hrcr.2016.08.012 Copyright © 2017 Heart Rhythm Society Terms and Conditions

Figure 1 A: Intracardiac tracings and 4 surface leads recorded during atrial tachycardia. The earliest atrial activation is seen in the distal pair of electrodes of the ablation catheter (Abl d) positioned in the junction of the superior vena cava and the posterior right atrium. B: A 23° right anterior oblique view showing catheter positions. The ablation catheter (arrow) is positioned at the site of origin of the atrial tachycardia at the junction of the superior vena cava and the posterior right atrium. C: A NavX map of the right and left atria displaying geometry and activation of the atrial tachycardia. The figure on the left shows a right lateral view of the right and left atria, and the figure on the right shows a cranial view. The ablation catheter is seen to be positioned at the site of origin of the arrhythmia (colored in white) at the junction of the superior vena cava and the right atrium. HeartRhythm Case Reports 2017 3, 199-204DOI: (10.1016/j.hrcr.2016.08.012) Copyright © 2017 Heart Rhythm Society Terms and Conditions

Figure 1 Continued HeartRhythm Case Reports 2017 3, 199-204DOI: (10.1016/j.hrcr.2016.08.012) Copyright © 2017 Heart Rhythm Society Terms and Conditions

Figure 2 A: A 25° right anterior oblique view showing the balloon inflated and positioned in the posterolateral region adjacent to the ablation catheter. Attention is drawn to the position of the wire tip (black arrow), which is halfway between the balloon and the anterior pericardium. Pacing from the ablation catheter (white arrow) with the balloon positioned at this position showed phrenic nerve capture. Ablation was not performed at this position. Note the pericardial sheath looking slightly tortuous, indicating a lack of tension in the balloon catheter. B: A 27° right anterior oblique view showing the balloon inflated and positioned in the posterolateral region adjacent to the ablation catheter. Attention is drawn to the position of the wire tip (black arrow), which is pushed against the anterior limit of the pericardial space and is bent backward. Pacing from the ablation catheter (white arrow) with the balloon positioned at this position showed no phrenic nerve capture. Note the pericardial sheath straightens, indicating tension from forward pressure applied in the balloon catheter. Compared to panel A, the distance between the balloon and the coronary sinus catheter is seen to be substantially greater, indicating a posterior displacement of the balloon. Ablation was performed at this position with successful termination of the arrhythmia. C: Termination of atrial tachycardia seen with application of radiofrequency energy. The application of radiofrequency energy was performed after the sheath maneuver displayed in panel B was performed and pacing from this site demonstrated the absence of phrenic nerve capture. Postablation, the right phrenic nerve was intact and displayed normal function. HeartRhythm Case Reports 2017 3, 199-204DOI: (10.1016/j.hrcr.2016.08.012) Copyright © 2017 Heart Rhythm Society Terms and Conditions