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Accessory pathway electrograms are rarely recorded in patients with Wolff-Parkinson-White syndrome. In one patient, during electrophysiologic study, simultaneous local ventricular (V) accessory pathway (AP) and atrial (A) deflections were recorded during bipolar catheter endocardial mapping over the pathway. Analysis of changes in electrographic intervals during performance of the ventricular extrastimulus technique allowed characterization of the retrograde conduction properties of the pathway. As coupling intervals were decreased, an initial increase was seen in the AP2A2 interval with subsequent ventriculoatrial block between the accessory pathway and atrium. When coupling intervals were further decreased, the V2AP2 interval lengthened with ultimate block between the ventricle and accessory pathway. These findings support the concept of impedance mismatch as the cause of conduction block in accessory pathways with the distal junction of the accessory pathway being the most vulnerable.
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
May 1988,
Cardiologia (Rome, Italy),
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
June 2006,
Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
November 1997,
Journal of cardiovascular electrophysiology,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
November 1983,
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W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
July 2009,
Journal of cardiovascular electrophysiology,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
January 2018,
Kardiologia polska,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
January 1989,
Pacing and clinical electrophysiology : PACE,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
January 1997,
Journal of cardiovascular electrophysiology,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
January 2003,
Scandinavian cardiovascular journal : SCJ,
W G O'Callaghan, and
P G Colavita, and
G N Kay, and
K A Ellenbogen, and
M R Gilbert, and
L D German
November 1988,
Pacing and clinical electrophysiology : PACE,
