Cardiology In Critical Care
Similar to normal sinus rhythm except that PP and RR intervals are irregular because the SA node discharges at a variable frequency. In children and young adults the irregularity is cyclic or related to respiration with the rate increasing during inspiration and decreasing during expiration. A cyclic sinus arrhythmia disappears upon exercise or breath holding and is accentuated by deep breathing. In elderly subjects the irregularity is frequently due to organic heart disease.
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