<unk>  is often asymptomatic. It is often a resulting symptom of a primary disease<unk> ate and can be an indication of the severity of a disease. If the heart rate is too high, cardiac output may fall due to the markedly reduced ventricular filling time. Rapid rates, though they may be compensating for ischemia elsewhere, increase myocardial oxygen demand and reduce coronary blood flow, thus precipitating an ischemic heart or valvular disease.<unk>  accompanying a myocardial infarction may be indicative of cardiogenic shock.
Sinus tachycardia
Tachycardia
Sinus arrhythmia
Junctional tachycardia
Sinus bradycardia
Ventricular tachycardia
Inappropriate sinus tachycardia
Automatic tachycardia