title: Wearable seismocardiography for the beat-to-beat assessment of cardiac intervals during sleep.
abstract: Seismocardiogram (SCG) can be detected during sleep by a textile-based wearable system. This pilot study preliminarily explores the feasibility of a beat-to-beat estimation of cardiac mechanical features (RR interval, RRI, Pre-Ejection Period, PEP, Isovolumic Contraction Time, ICT, Left Ventricular Ejection Time, LVET, Isovolumic Relaxation Time, IRT) from the joint ECG and SCG assessment during sleep. The analysis of two 30-min sleep data segments from one healthy subject, indicated that 1) respiration largely influence the dynamics of most of the parameters; 2) variability of cardiac intervals is only marginally influenced by the RRI variability; 3) appreciable spectral power at frequencies ≤ 0.1 is only observed in the RRI spectrum and not in the spectra of the other indexes; 4) IRT has a broadband variability, that is clearly different from the dynamics of the other indexes. These findings represent the very first description of the beat-to-beat variability of cardiac mechanical indexes. Further investigations on a larger population are in progress to confirm the present results.
authors.forename: Marco
authors.initials: M
authors.lastname: Di Rienzo
authors.forename: Emanuele
authors.initials: E
authors.lastname: Vaini
authors.forename: Paolo
authors.initials: P
authors.lastname: Castiglioni
authors.forename: Prospero
authors.initials: P
authors.lastname: Lombardi
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Parati
authors.forename: Carolina
authors.initials: C
authors.lastname: Lombardi
authors.forename: Paolo
authors.initials: P
authors.lastname: Meriggi
authors.forename: Francesco
authors.initials: F
authors.lastname: Rizzo
mesh_terms: D000328:Adult; D006334:Heart Function Tests / Q000295:instrumentation*; D006339:Heart Rate; D006801:Humans; D009200:Myocardial Contraction; D010865:Pilot Projects; D017286:Polysomnography / Q000295:instrumentation*; D012119:Respiration; D012890:Sleep / Q000502:physiology; D013026:Space Flight