Paroxysmal atrial tachycardia (PAT) is associated with a number of findings on the electrocardiogram (ECG). The arrhythmia may be episodic (paroxysmal) or sustained.
(1) atrial rate
(2) P wave morphology
(3) ventricular rate and rhythm
Atrial rate: 100-250 beats per minute
P waves often have an abnormal morphology. At higher ventricular rates the P waves may be masked by the preceding T waves.
Ventricular rate: variable, depending on the degree of atrioventricular block. If there is no block, then the rapid ventricular rate may be associated with clinical symptoms (hypotension, altered mental status, heart failure, and/or chest pain).
Ventricular rhythm is usually regular, but may be irregular if the AV block is variable.
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