Abstract | OBJECTIVES: BACKGROUND: Paroxysmal AF can be initiated by ectopic atrial beats originating in the pulmonary vein (PV) or superior vena cava (SVC). The effect of change in autonomic tone on this focal AF is unknown. METHODS: This study included 12 patients with frequent bursts of AF documented by 24-h Holter monitoring. The number and coupling interval of spontaneous ectopic activity and bursts of AF were evaluated for 1 min before and after phenylephrine (2 to 3 microg/kg) injection. RESULTS: After detailed mapping, four patients had a focus located in the left superior PV, six in the right superior PV and two in the SVC. In 10 patients with AF foci originating in the PVs, the frequency of ectopic activity (19.5 +/- 27.4 vs. 11.4 +/- 22.9 beats/min, p = 0.059) was reduced as well as AF bursts (14 +/- 3 vs. 1.8 +/- 2.7 bursts/min, p = 0.005) before versus after phenylephrine injection; the minimal coupling interval of ectopic activity and AF bursts became longer compared with baseline. The maximal percent increase in sinus cycle length after phenylephrine injection was significantly greater in patients with complete suppression of AF compared with those with partial suppression (43 +/- 19 vs. 14 +/- 5%, p = 0.01). However, no significant effect of phenylephrine on AF originating in the SVC was found. CONCLUSIONS: Change in autonomic tone induced by phenylephrine injection was effective in suppressing focal AF originating in the PVs but not in the SVC.
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Authors | C T Tai, C W Chiou, Z C Wen, M H Hsieh, C F Tsai, W S Lin, C C Chen, Y K Lin, W C Yu, Y A Ding, M S Chang, S A Chen |
Journal | Journal of the American College of Cardiology
(J Am Coll Cardiol)
Vol. 36
Issue 3
Pg. 788-93
(Sep 2000)
ISSN: 0735-1097 [Print] United States |
PMID | 10987601
(Publication Type: Clinical Trial, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Cardiotonic Agents
- Phenylephrine
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Topics |
- Aged
- Atrial Fibrillation
(drug therapy, physiopathology, surgery)
- Cardiac Complexes, Premature
(drug therapy, surgery)
- Cardiotonic Agents
(therapeutic use)
- Catheter Ablation
- Electrophysiology
- Female
- Humans
- Male
- Middle Aged
- Phenylephrine
(therapeutic use)
- Pulmonary Veins
(physiopathology)
- Radiosurgery
- Vena Cava, Superior
(physiopathology)
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