Certified EKG Technician (CET) 2025 – 400 Free Practice Questions to Pass the Exam

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What is the definition of sinus arrhythmia?

A dangerous heart condition

A variation in heart rate during the breathing cycle

Sinus arrhythmia refers specifically to a variation in heart rate that occurs during the breathing cycle. This physiological phenomenon is typically characterized by an increase in heart rate during inhalation and a decrease during exhalation. It is most commonly observed in children and young adults, and it often reflects a normal variation associated with autonomic nervous system activity. Since it occurs due to the influence of breathing on heart dynamics, this makes it a normal response rather than a pathological condition, distinguishing it from conditions like dangerous heart conditions or electrical malfunctions. Sinus arrhythmia is often considered a benign variation and can be a normal finding on an EKG, particularly in healthy individuals.

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A result of electrical malfunction

A type of heart block

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