Abstract
Normal cardiac rhythm is called sinus rhythm. Sinus rhythm is controlled by the sinoatrial (SA) node, located in the right atrial wall near its junction with the superior vena cava. With sinus rhythm, the P wave due to atrial depolarization is upright in ECG leads I and II, AVF, and leads V3-V6. It is negative in lead AVR, and may be upright or negative in leads III and AVL. In the healthy resting adult, sinus rhythm is usually stated to range between 60 and 100 beats/minute. Cardiac rates above 100/minute are referred to as sinus tachycardia when they originate in the SA node. Cardiac rates below 60/minute are considered to be sinus bradycardia when they originate within the sinoatrial node. However, healthy resting adults often have heart rates in the 50s and even in the 40s. Occasional healthy young adults have heart rates in the 30s during sleep (Brodsky et al, 1977). On the other hand, healthy resting adults seldom have heart rates above 80/minute or so.
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© 1991 Springer-Verlag New York Inc.
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Fowler, N.O. (1991). Cardiac Arrhythmias: Premature Beats and Paroxysmal Tachycardias. In: Diagnosis of Heart Disease. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3068-7_26
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DOI: https://doi.org/10.1007/978-1-4612-3068-7_26
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