Author + information
- Received June 11, 1997
- Revision received August 21, 1997
- Accepted September 2, 1997
- Published online December 1, 1997.
- Anne B Curtis, MD, FACCA,* (, )
- Luiz Belardinelli, MDA,
- David A Woodard, MDA,
- Christopher S Brown, MDA and
- Jamie B Conti, MD, FACCA
- ↵*Dr. Anne B. Curtis, University of Florida, Box 100277, 1600 SW Archer Road, Gainesville, Florida 32610.
Objectives. This study sought to evaluate the sensitivity of fast and slow atrioventricular (AV) node pathways to incremental doses of adenosine in patients with typical AV node reentrant tachycardia.
Background. Although adenosine is known to depress conduction through the AV node, the relative sensitivity to adenosine of the anterograde fast and slow pathways in patients with dual AV node pathways and typical AV node reentrant tachycardia has not previously been studied.
Methods. Sixteen patients with dual AV node physiology and typical AV node reentrant tachycardia and 10 control patients were given incremental doses of adenosine during atrial pacing.
Results. In 14 of 16 patients with dual-AV node physiology, administration of small doses of adenosine during atrial pacing led consistently to transient block of impulse conduction in the fast pathway before block in the slow pathway, resulting in abrupt prolongation of the AH interval with continued 1:1 AV conduction. The mean (±SD) doses of adenosine required to cause conduction block in the fast and slow pathways were 2.7 ± 3.0 and 7.2 ± 4.7 mg, respectively (p = 0.004). In 9 of 16 patients, administration of low dose adenosine led to initiation of AV node reentrant tachycardia. The control patients showed no abrupt increases in AH interval with administration of adenosine during atrial pacing.
Conclusions. In most patients with dual AV node pathways and typical AV node reentrant tachycardia, the fast pathway is more sensitive than the slow pathway to the effects of adenosine.
☆ Dr. Woodard was the recipient of a Research Fellowship from the American Heart Association, Dallas, Texas.
- Received June 11, 1997.
- Revision received August 21, 1997.
- Accepted September 2, 1997.
- The American College of Cardiology