Two cases are described where atropine induced the disappearance of reset zone as response to premature atrial stimulation for blocked retrograde atrial conduction. Because of this, sinuatrial conduction time could not be estimated. The sinus node electrogram allowed the direct measurement of sinuatrial conduction and showed a facilitated anterograde conduction through the perinodal fibers after administration of the drug.
- sinuatrial block
- sinuatrial conduction
- sinus node
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine