Aberrant atrial conduction.

I would like to make one comment regarding the paper entitled 'Aberrant Atrial Conduction' from the British Heart journal of April I972, by Edward K. Chung. In all of his examples of socalled aberrant atrial conduction he makes an assumption that the aberrant atrial impulse originates from the sinus. I am unable to ascertain from his article how he came to this conclusion. Most of his examples are those of different shaped P waves following some type of ectopic atrial activity. It is well known that ectopic atrial impulses will suppress the sinus for one or more beats. During this time subsidiary pacemakers may escape. We are all aware of subsidiary escape from a junctional or a ventricular pacemaker. It is my contention that subsidiary atrial pacemakers from other foci may occur just as commonly, if not more so. Thus what Professor Chung is calling 'Aberrant atrial conduction' is merely escapes of