Nonparoxysmal atrial tachycardia

Non-paroxysmal atrial tachycardia, which is also called automatic tachycardia, is caused by enhanced atrial automaticity as an atrial focus depolarizes faster than the sinus node and becomes the pacemaker. It may be seen with toxic effects of digitalis, chronic obstructive pulmonary disease, heart failure, pneumonia with hypoxemia, certain drugs such as aminophylline, and metabolic derangements. The atrial rate is usually between 110 and 130 beats/min, and there may be a 2:1 or 3:1 atrioventricular block, particularly if digoxin is involved. As with other ectopic atrial rhythms, the P wave differs from that seen during normal sinus rhythm.

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