Isabela Thomaz Takakura, Rosangela Akemi Hoshi, Márcio Antonio Santos, Flávio Correa Pivatelli, João Honorato Nóbrega, Débora Linhares Guedes, Victor Freire Nogueira, Tuane Queiroz Frota, Gabriel Castro Castelo, Moacir Fernandes de Godoy
OBJECTIVE: To evaluate a possible evolutionary post-heart transplant return of autonomic function using quantitative and qualitative information from recurrence plots. METHODS: Using electrocardiography, 102 RR tachograms of 45 patients (64.4% male) who underwent heart transplantation and that were available in the database were analyzed at different follow-up periods. The RR tachograms were collected from patients in the supine position for about 20 minutes. A time series with 1000 RR intervals was analyzed, a recurrence plot was created, and the following quantitative variables were evaluated: percentage of determinism, percentage of recurrence, average diagonal length, Shannon entropy, and sample entropy, as well as the visual qualitative aspect...
July 2017: Brazilian Journal of Cardiovascular Surgery