Certified Rhythm Analysis Technician (CRAT) Practice Exam 2025 – All-in-One Study Guide for Exam Success!

Question: 1 / 400

In a normal sinus rhythm, the sinus node fires at a rate of what?

40-60 per minute

61-100 per minute

In normal sinus rhythm, the sinus node, which is the heart's natural pacemaker, typically fires at a rate of 61-100 beats per minute. This range is considered normal for adults at rest and reflects the heart's ability to maintain an appropriate rhythm and rate without external influences or abnormalities. When the sinus node fires within this rate, it leads to the consistent and rhythmic contraction of the heart, ensuring effective blood circulation.

Rates below 60 beats per minute may suggest bradycardia, which can indicate various cardiac issues or physiological conditions, while rates above 100 beats per minute indicate tachycardia, which could also be a sign of underlying health problems. Thus, understanding that a firing rate of 61-100 per minute is indicative of a healthy normal sinus rhythm is crucial for rhythm analysis and assessment in clinical practice.

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101-150 per minute

151-180 per minute

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