VLF component attenuation in chagasic myocardiopathy measured in Holter recordings

Ten Holter records were analyzed, corresponding to four chagasic patients who suffered sudden death during Holter recording, three chagasic patients that survived and three normal subjects. HRV signals were obtained from Holter tapes. Power spectral analysis was performed on each series by AR modeling. Compressed spectral arrays (CSA) were plotted for each series, where a tendency was observed to maintain frequency peak positions along time in sudden death series, as opposite to control series, where the frequency position of the peaks had many oscillations around the center frequency. A strong reduction was found in the VLF component in the death series as compared to the others