The study was completed at the University of Florida, College of Veterinary Medicine and was presented as an abstract at the 2011 ECVIM conference in Sevilla, Spain.
Atrial-Based Pacing for Sinus Node Dysfunction in Dogs: Initial Results
Article first published online: 10 APR 2012
Copyright © 2012 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 26, Issue 3, pages 558–564, May-June 2012
How to Cite
Estrada, A.H., Pariaut, R., Hemsley, S., Gatson, B.H. and Moïse, N.S. (2012), Atrial-Based Pacing for Sinus Node Dysfunction in Dogs: Initial Results. Journal of Veterinary Internal Medicine, 26: 558–564. doi: 10.1111/j.1939-1676.2012.00928.x
- Issue published online: 2 MAY 2012
- Article first published online: 10 APR 2012
- Manuscript Accepted: 10 MAR 2012
- Manuscript Revised: 21 FEB 2012
- Manuscript Received: 6 DEC 2011
- Lead dislodgment;
- Lead perforation;
- Sick sinus syndrome;
- Sinus node dysfunction
An important consideration for the treatment of sick sinus syndrome (SSS) lies in the function of the atrioventricular (AV) node because most patients with SSS retain the ability to conduct atrial impulses.
This retrospective study examined the feasibility of atrial pacing (AAI) in dogs with sinus node dysfunction (SND).
Sixteen dogs with SND and AAI pacing were identified.
Retrospective review of medical records.
Follow-up time ranged from 45 to 1,227 days (mean: 292 days). Only 1 dog developed AV block 3 days postoperatively. Complete lead dislodgment occurred in 3/16 dogs 1, 19, and 27 days postoperatively. Lead perforation into the pericardial space occurred in 2/16 dogs. Rising thresholds for pacing with possible lead microdislodgment or fibrosis were suspected in another 3/16 dogs 57, 192, and 1,016 days after implantation. None of these dogs had complete loss of capture but all required higher thresholds for pacing.
Conclusions and Clinical Importance
Based on this small group of dogs, clinically important AV block does not appear to occur in the long-term for dogs with SND. Risks of lead perforation, complete dislodgment, and rising thresholds for pacing, possibly because of microdislodgment, may be related to the initial skill level of the operator or the leads that were used. Use of leads with reduced torque at the lead tip, higher flexibility, increased lead-tip surface of contact with the endocardium or, more likely, use of alternate locations for pacing in the small right atrium of dogs with SND may decrease the frequency of these complications.