Canine model of paroxysmal atrial fibrillation and paroxysmal atrial tachycardia

Moshe Swissa, Shengmei Zhou, Offir Paz, Michael C. Fishbein, Lan Chen, Peng-Sheng Chen

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Both autonomic nerve activity and electrical remodeling are important in atrial arrhythmogenesis. Therefore, dogs with sympathetic hyperinnervation, myocardial infarction (MI), and complete atrio ventricular block (CAVB) may have a high incidence of atrial arrhythmias. We studied eight dogs (experimental group) with MI, CAVB, and sympathetic hyperinnervation induced either by nerve growth factor infusion (n = 4 dogs) or subthreshold electrical stimulation (n = 4 dogs) of the left stellate ganglion. Cardiac rhythm was continuously monitored by a Data Sciences International transmitter for 48 (SD 27) days. Three normal control dogs were also monitored. Six additional normal dogs were used for histology control. Paroxysmal atrial fibrillation (PAF) and paroxysmal atrial tachycardia (PAT) were documented in all dogs in the experimental group, with an average of 3.8 (SD 3) episodes/day, including 1.3 (SD 1.6) episodes of PAF and 2.5 (SD 2.2) episodes of PAT. The duration averaged 298 (SD 745) s (range, 7-4,000 s). There was a circadian pattern of arrhythmia onset (P <0.01). Of 576 episodes of PAF and PAT, 236 (41%) episodes occurred during either sustained or nonsustained ventricular tachycardia (VT). Among these 236 episodes, 53% started before VT, whereas 47% started after the onset of VT. Normal dogs did not have either PAF or PAT. The hearts from the experimental group had a higher density of nerve structures immunopositive (P <0.01) for three different nerve specific markers in both right and left atria than those of the control dogs. We conclude that the induction of nerve sprouting and sympathetic hyperinnervation in dogs with CAVB and MI creates a high yield model of PAF and PAT.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume289
Issue number5 58-5
DOIs
StatePublished - Nov 2005
Externally publishedYes

Fingerprint

Paroxysmal Tachycardia
Atrial Fibrillation
Canidae
Dogs
Ventricular Tachycardia
Myocardial Infarction
Heart Atria
Cardiac Arrhythmias
Atrial Remodeling
Stellate Ganglion
Autonomic Pathways
Nerve Growth Factor
Electric Stimulation
Histology

Keywords

  • Atrial arrhythmia
  • Electrophysiology
  • Pathology
  • Stellate ganglion

ASJC Scopus subject areas

  • Physiology

Cite this

Canine model of paroxysmal atrial fibrillation and paroxysmal atrial tachycardia. / Swissa, Moshe; Zhou, Shengmei; Paz, Offir; Fishbein, Michael C.; Chen, Lan; Chen, Peng-Sheng.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 289, No. 5 58-5, 11.2005.

Research output: Contribution to journalArticle

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