<unk>  usually arises because of an underlying medical condition. Its prevalence has been estimated at about 3 per 1000 in adult hospital inpatients and is much rarer in paediatric practice; it is more common in the elderly, and its management and prognosis are both those of the underlying diagnosis. It is mostly common in patients with lung disorders, but it can occur after acute myocardial infarction and can also occur in the setting of low blood potassium or low blood magnesium. It is sometimes associated with digitalis toxicity in patients with heart disease. It is most commonly associated with hypoxia and COPD. Additionally, it can be caused by theophylline toxicity, a drug with a narrow therapeutic index commonly used to treat COPD. Theophylline can cause a number of different abnormal heart rhythms when in excess, and thus further predisposes COPD patients to<unk> . Theophylline toxicity often occurs following acute or chronic overtreatment or factors lowering its clearance from the body.
Multifocal atrial tachycardia
Wandering atrial pacemaker
Atrioventricular reentrant tachycardia
AV nodal reentrant tachycardia
Second-degree atrioventricular block
Third-degree atrioventricular block
First-degree atrioventricular block
Sinus arrhythmia