NCIt definition : An electrocardiographic finding of premature atrial complexes which are not conducted
to the ventricle, and which are not followed by a QRS complex. (CDISC);
Alternative definition : CDISC: An electrocardiographic finding of a premature atrial complexes that are is
not conducted to the ventricles, and that are is not followed by a QRS complex; there
may be one or more occurrences during an electrocardiographic recording.;