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Unusual Sinus Node Response Curves in Two Cardiac Transplant Recipients
Author(s) -
BEXTON RODNEY S.,
NATHAN ANTHONY W.,
CAMM A. JOHN
Publication year - 1986
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1986.tb05396.x
Subject(s) - medicine , sinus (botany) , asymptomatic , cardiology , sinoatrial node , cardiac pacing , node (physics) , heart rate , botany , structural engineering , blood pressure , engineering , biology , genus
We describe unusual responses of the sinus node to programmed atrial stimulation in two asymptomatic cardiac transplant recipients. In one patient the sinoatrial conduction time, calculated using the revised method of Strauss, is extremely short (5 ms), and in the other it is extremely long (460 ms). The various mechanisms that might be involved in these atypical responses to atrial extrastimulation are discussed. These include sinus node suppression, shift of pacemaker, direct stimulation of are the sinus node and shortening of the sinus node action potential duration.