The main symptom of<unk>  is the sudden development of rapid regular palpitations. These palpitations may be associated with a fluttering sensation in the neck, caused by near-simultaneous contraction of the atria and ventricles against a closed tricuspid valve leading to the pressure or atrial contraction being transmitted backwards into the venous system. The rapid heart rate may lead to feelings of anxiety, and may therefore be mistaken for panic attacks. In some cases, the onset of the fast heart is associated with a brief drop in blood pressure. When this happens, someone may experience dizziness or rarely lose consciousness (faint). Someone with underlying coronary artery disease (narrowing of the arteries of the heart by atherosclerosis) who has a very rapid heart rate may experience chest pain similar to angina; this pain is band- or pressure-like around the chest and often radiates to the left arm and angle of the left jaw. Symptoms often occur without any specific trigger, although some find that their palpitations often occur after lifting heavy items or bending forwards. The onset of palpitations is sudden, with the acceleration of the heart rate occurring within a single beat, and may be preceded by a feeling of the heart skipping a beat. The heart may continue to race for minutes or hours, but the eventual termination of the arrhythmia is as rapid as its onset. During<unk>  the heart rate is typically between 140 and 280 beats per minute. Close inspection of the neck may reveal pulsation of the jugular vein in the form of "cannon A-waves" as the right atrium contracts against a closed tricuspid valve.
AV nodal reentrant tachycardia
Tachycardia
Re-entry ventricular arrhythmia
Junctional ectopic tachycardia
Atrioventricular reentrant tachycardia
Wandering atrial pacemaker
Pre-excitation syndrome
Ventricular escape beat