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When examining a rhythmogram, it is necessary first of all to evaluate the heart rate. The average heart rate can be determined by comparing the average amplitude of the rhythmogram graph with the vertical scale of the graph. It must be remembered that heart rate is equal to a ratio of 60 to the average value of R-R intervals in seconds. For example, if the average value of the cardio intervals during the visual assessment of the graph is 1.0 sec., The average heart rate will be 60 beats per minute.

The magnitude of the change in the duration of the RR intervals must be estimated by the minimum and maximum value of the duration of the CI. It must be remembered that episodes of rhythm and conduction disturbance strongly influence these ranges.

Estimation of the recording duration (it does not always coincide with the duration of the rhythmogram). Usually a 5 minute rhythmogram score is used. When changing the duration of the rhythmogram, the scale of the graph changes compared to the five-minute one.

If episodes of a sharp change in heart rate are detected, the results of spectral analysis should be carefully interpreted, and if more than 5-10% of such elements are found, the traditional assessment of spectral analysis should be abandoned.

To evaluate the wave structure of the rhythmogram and determine its class, it is necessary to compare the rhythmogram of a particular patient with samples of rhythmograms of certain classes (see
"3.4.1. Visual assessment of the rhythmogram ”).

When the functional state of the CVS deteriorates, the wave structure of the rhythm is smoothed, which is accompanied by a decrease in the amplitude of the RR intervals.

The rhythmogram of a practically healthy subject

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