Symptoms reported by patients vary in frequency and severity. They may include: * Frequent or sustained palpitations * Dyspnea (shortness of breath) and palpitations on exertion * Pre-syncope (feeling as if about to faint) * Fatigue * Dizziness * Exercise intolerance * Occasional paresthesia and cramping * Symptoms associated with autonomic nervous system disturbance, including gastrointestinal disturbance
Inappropriate sinus tachycardia
Ventricular escape beat
AV nodal reentrant tachycardia
Junctional ectopic tachycardia
Sinoatrial arrest
Junctional tachycardia
Second-degree atrioventricular block
Wandering atrial pacemaker