TY - CHAP M1 - Book, Section TI - Complex Cornucopia A1 - Zimmerman, Franklin H. PY - 2023 T2 - ECG Core Curriculum AB - In normal sinus rhythm the heart is depolarized in a sequential, predictable fashion. From the sinoatrial (SA) node, the impulse first depolarizes the atria on its way to the AV node and then travels through the specialized conduction system to ultimately activate the ventricles. Each cell of the heart is depolarized on time, recorded on the ECG as the P wave, PR interval, and QRS complex, something that we can display graphically with a ladder diagram (Figure 15-1). But to liberally paraphrase Scottish poet Robert Burns, “The best laid plans of mice and men and the sinus node go oft awry.” With that introduction, let’s now discuss the subject of ectopic complexes. SN - PB - McGraw Hill Education CY - New York, NY Y2 - 2024/10/15 UR - accesscardiology.mhmedical.com/content.aspx?aid=1200100750 ER -