C199682Level 8

Heart Rate Variability, Standard Deviation NN Interval Measurement

**Semantic type:** Diagnostic Procedure

**Definition:** A measurement of the fluctuation in the time intervals between adjacent heartbeats, based on the standard deviation of the NN interval.

**Synonyms:** - HRVSDNN - Heart Rate Variability, SDNN - Heart Rate Variability, SDNN - Heart Rate Variability, Standard Deviation NN Interval

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C199998Heart Rate Variability, Average Standard Deviation NN Interval Measurement

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