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.

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 ...

When the ECG pattern is monitored for ischemia ... qualitatively at least, detect ectopy. For clinical purposes, this amount of information is usually sufficient. The practicing physician does ...

Each P wave is followed by a QRS complex which is narrow (supraventricular in origin). Click below for a detalied review of ECG findings in ectopic atrial rhythms.