Non-linear structure analysis of inter-beat interval data in patients after myocardial infarction
| Authors | |
|---|---|
| Year of publication | 2000 |
| Type | Article in Periodical |
| Magazine / Source | Scripta Medica |
| MU Faculty or unit | |
| Citation | |
| Field | Cardiovascular diseases incl. cardiosurgery |
| Keywords | myocardial infarction; scaling index; |
| Description | The aim of the present study was to test reliability of the quotint fast scaling index method" of nonlinear dynamics (chaos theory) of heart rate variability. Holter 24-hour ECG recordings in patients after myocardial infarction were analysed. The scaling index alpha, i.e. the state distribution of successive RR intervals in phase space, was calculated of 500 beats at the beginning of each hour and the N(alpha) histogram was constructed as a sum of 24 histograms. The difference between the alpha value calculated for the peak of sinus rhythm and that for ectopic beats was determined. The reliability of this fast method was tested by a comparison of each 24-hour histogram with three relevant 6-hour histograms (night, morning and afternoon). No difference was found in the delta alpha determination from 24-hour and 6-hour periods. The time of recording (morning, afternoon, night) did not play any role, either. It is concluded that this scaling index alpha method is suitable for clinical practice. |
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