Change In Cycle Length During Narrow Complex Tachycardia: What Is The Mechanism?
Major spontaneous variation in cycle length during supraventricular tachycardia is quite an uncommon phenomenon, which sometimes can mislead a correct diagnosis. We describe a patient who developed spontaneous variation in cycle length during electrophysiologic study in whom the coronary sinus cannulation was extremely difficult. In this situation, careful inspection of the mechanisms associated with this variation and classic pacing maneuvers are important to make a correct diagnosis of the supraventricular tachycardia.
In this paper,the stability of a class of stage structure SIS model with small delay is studied.The sufficient conditions for asymptotical stability of the equilibrium are given.Some simulations are carried out by matlab software to support the correctness of our analysis results.Owing to the small delay,the results are the continuation and complement of the previous authors.