Adenosine can also improve the conduction between the superior vena cava and right atrium after isolation.
A 64-year-old man with atrial tachycardia (AT) 3 years after a superior vena cava (SVC) isolation for atrial fibrillation underwent electrophysiologic testing. SVC mapping with a basket catheter revealed a more frequent activation in the SVC than in either of the atria during the AT and consequently the recovered conduction between the SVC and right atrium. The conduction improved from 3 or 4-1 conduction to 2-1 conduction after adenosine was administered. Ectopic firing in the SVC persisted even after restoration of sinus rhythm by the successful SVC isolation, which was confirmed by adenosine.
Yamada
Takumi
T
Division of Cardiovascular Diseases, Cardiac Rhythm Management Laboratory, University of Alabama at Birmingham, Birmingham, AL 35294-0019, USA. takumi-y@fb4.so-net.ne.jp
Murakami
Yoshimasa
Y
Plumb
Vance J
VJ
Kay
G Neal
GN
D000241:Adenosine / Q000494:pharmacology*; D016280:Atrial Function, Right / Q000187:drug effects* / Q000502:physiology; D022062:Electrophysiologic Techniques, Cardiac / Q000379:methods*; D006329:Heart Conduction System / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D014683:Vena Cava, Superior / Q000187:drug effects* / Q000502:physiology
D000241:Adenosine