This ectopic focus becomes the predominant pacemaker ... Brief atrial tachycardia is seen very commonly on ambulatory ECG monitoring in the elderly and is frequently asymptomatic.

The ECG will show a premature, ectopic P wave occuring and then no QRS complex afterwards. When this occurs in a pattern of bigeminy, the interpreter may be fooled into thinking that sinus ...

For ventricular ectopy, an instantaneous rate of >40–50 ... sinus depolarization would suppress it 2,3. Figure 2: An ECG obtained from a beagle dog 21 days later, showing six rhythm strips ...