An<unk>  is a cardiac arrhythmia which involves an area of the heart generating an abnormally fast rhythm, sometimes also called enhanced<unk> ity. These<unk> s, or fast heart rhythms, differ from reentrant<unk> s (AVRT and AVNRT) in which there is an abnormal electrical pathway which gives rise to the pathology. Most<unk> s are supraventricular<unk> s (SVT). It is important to recognise an<unk>  because the treatment will be different to that for a reentrant<unk> . The most useful clue will be the presence of 'warm up' and 'cool down'. This means that whereas a reentrant<unk>  will both begin and end abruptly as cardiac conduction utilises then ceases to utilise the accessory pathway, an<unk>  will rise and fall gradually in rate as the<unk>  focus increases and decreases its<unk>  rate of electrical discharge.
Automatic tachycardia
Reflex bradycardia
Junctional tachycardia
Hypopyon
Inappropriate sinus tachycardia
Sinoatrial arrest
Permissive hypotension
Sinus bradycardia