The non-conducting flutter waves are often mistaken for or merged with T waves and become apparent only if the block is increased. The rate increases gradually and may show beat to beat variation. Premature Atrial Complex This occurs when an ectopic sites within the atria fires an impulse before the next impulse from the SA node. Atrial Fibrillation Irritable sites in the atria fire very rapidly, between bpm. The P waves will vary in shape and at least three different shapes can be observed. It is sometimes associated with digitalis toxicity in patients with heart disease. P wave morphology and axis are normal, although the height of the P wave may increase with the heart rate and the PR interval will shorten.
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This article has been cited by other articles in PMC. The causes of atrial flutter are similar to those of atrial fibrillation, although idiopathic atrial flutter is uncommon. Pharmacological —Adrenaline as a result of phaeochromocytoma; salbutamol; alcohol, caffeine. It is most commonly associated with hypoxia and COPD. In adults a tachycardia is any heart rate greater than beats per minute. Narrow QRS complexes are visible as well.