In this article, we will discuss the Atrial Tachycardia. So, let’s get started.
The atrial tachycardia is characterised by atrial rate of 150-200/min and the P-wave contour is different from that of sinus P-wave. As atrial rate increases, the degree of AV block increases and Wenckebach second degree AV block may ensure, i.e. atrial tachycardia with block (a manifestation of digitalis toxicity). The ECG shows isoelectric line between the P-waves which are abnormal in shape and differ from sinus P-waves. The ventricular complexes are narrow and there is normal intraventricular conduction.
1. Digoxin withdrawal is sufficient to terminate it if it is the cause of arrhythmia.
2. Automatic atrial tachycardia not caused by digitalis is difficult to terminate. Radio-frequency ablation should be attempted since control of this form of tachycardia with drugs such as digitalis, beta-blockers, calcium channel blockers is usually unsuccessful.