2. 1. Atrial premature complexes,normally
conducted
—suggested by the following:
■ Premature P wave in relation to normal sinus rhythm
■ P wave usually abnormal in configuration
■ PR interval may be normal,increased,or decreased
■ Post-extrasystolic pause is noncompensatory unless sinoatrial
entrance block is present and sinoatrial node is not reset, resulting
in either an interpolated beat or a full compensatory pause
■ QRS complex similar in morphology to the QRS complex present
during sinus rhythm
3.
4. 2. Atrial premature complexes,nonconducted
■ Premature P waves that are abnormal in morphology but
not followed by QRS
■ P waves that are often hidden in T wave (look for
deformed T wave)
■ The sinus node is usually reset, resulting in RR interval
pauze
5. 3. Atrial premature complexes with aberrant
intraventricular conduction
■ P wave that occurs very early
■ RBBB pattern is most common, but LBBB
or even variable QRS morphology may
occur
