title: Visualization of Heart Rate Variability of Long-Term Heart Transplant Patient by Transition Networks: A Case Report.
abstract: We present a heart transplant patient at his 17th year of uncomplicated follow-up. Within a frame of routine check out several tests were performed. With such a long and uneventful follow-up some degree of graft reinnervation could be anticipated. However, the patient's electrocardiogram and exercise parameters seemed largely inconclusive in this regard. The exercise heart rate dynamics were suggestive of only mild, if any parasympathetic reinnervation of the graft with persisting sympathetic activation. On the other hand, traditional heart rate variability (HRV) indices were inadequately high, due to erratic rhythm resulting from interference of the persisting recipient sinus node or non-conducted atrial parasystole. New tools, originated from network representation of time series, by visualization short-term dynamical patterns, provided a method to discern HRV increase due to reinnervation from other reasons.
authors.affiliation: 1st Chair and Clinic of Cardiology, Medical University of Gdańsk Gdańsk, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Wdowczyk
authors.affiliation: Institute of Theoretical Physics and Astrophysics, University of Gdańsk Gdańsk, Poland.
authors.forename: Danuta
authors.initials: D
authors.lastname: Makowiec
authors.affiliation: Department of Noninvasive Cardiac Diagnostics, 2nd Chair of Cardiology, Medical University of Gdańsk Gdańsk, Poland.
authors.forename: Karolina
authors.initials: K
authors.lastname: Dorniak
authors.affiliation: 1st Chair and Clinic of Cardiology, Medical University of Gdańsk Gdańsk, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Gruchała
keywords: arrhythmias; cardiac autonomic modulation; heart rate variability; heart transplantation; hearth rhythm dynamics; reinnervation