Page 424 - ECG dr shamol_Slide

Premature Beats/Ectopic Beats/Extra -systole
It is the beat that is arising from an ectopic focus

outside the SA node and occurring before the

next sinus beat. It may arise from:

I. Atria

II. Nodal
III. Ventricular

It can arise from either of the ones mentioned

above because pace maker are located in the
following order