title: Temporal trends of neuro-autonomic complexity during severe episodes of bipolar disorders.
abstract: Bipolar disorder is a chronic psychiatric condition during which patients experience mood swings among depression, hypomania or mania, mixed state (depression-hypomania) and euthymia, i.e., good affective balance. Nowadays, an objective characterization of the temporal trends of the disease as a response to the pharmacological treatment through physiological signatures, especially during severe episodes, is still missing. In this study we show interesting findings relating neuro-autonomic complexity to severe pathological mood states. More specifically, we studied Sample Entropy (SampEn) measures on Heart Rate Variability series gathered from four bipolar patients recruited within the frame of the European project PSYCHE. Patients were monitored through long term ECG recordings from the first hospital admission until clinical remission, i.e., the euthymic state. We observed that a mood transition from mixed-state to euthymia passing through depression can be characterized by increased SampEn values, i.e. as the patient is going to recover, SampEn increases. These results are in agreement with the current literature reporting on the complexity dynamics of the cardiovascular system and can provide a promising and viable clinical decision support to objectify the diagnosis and improve the management of psychiatric disorders.
authors.forename: Mimma
authors.initials: M
authors.lastname: Nardelli
authors.forename: Gaetano
authors.initials: G
authors.lastname: Valenza
authors.forename: Claudio
authors.initials: C
authors.lastname: Gentili
authors.forename: Antonio
authors.initials: A
authors.lastname: Lanata
authors.forename: Enzo Pasquale
authors.initials: EP
authors.lastname: Scilingo
mesh_terms: D000328:Adult; D000339:Affect; D000465:Algorithms; D001341:Autonomic Nervous System / Q000503:physiopathology*; D001714:Bipolar Disorder / Q000175:diagnosis / Q000473:pathology* / Q000517:prevention & control; D001794:Blood Pressure; D015716:Electrocardiography, Ambulatory; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D012720:Severity of Illness Index