monitoring the four-chamber view by two-dimensional echocardiography , we examined recorded the contraction sequence of the atrial and ventricular walls and the ventricular septum by single or dual m-mode echocardiograms , and could diagnose various arrhythmias including atrial flutter , complete and incomplete heart blocks , premature contractions and sinus arrhythmias .
C0003811
arrhythmias
C0004239
atrial