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Medientyp:
E-Artikel
Titel:
“Switch-Off” of Respiratory Sinus Arrhythmia Can Occur in a Minority of Subjects During Functional Magnetic Resonance Imaging (fMRI)
Beteiligte:
Rassler, Beate
[Verfasser:in];
Schwerdtfeger, Andreas
[Verfasser:in];
Aigner, Christoph Stefan
[Verfasser:in];
Pfurtscheller, Gert
[Verfasser:in]
Erschienen:
Lausanne: Frontiers Research Foundation, [2023]
Beschreibung:
A group of 23 healthy scanner naïve participants of a functional magnetic resonanceimaging (fMRI) study with increased state anxiety exhibited 0.1 Hz oscillations in bloodoxygenation-level-dependent (BOLD) signals, heart rate (HR) beat-to-beat intervals(RRI) and respiration. The goal of the present paper is to explore slow oscillations inrespiration and RRI and their phase-coupling by applying the dynamic “wave-by-wave”analysis. Five participants with either high or moderate levels of fMRI-related anxiety(age 23.83.3y) were found with at least one bulk of consecutive breathing waveswith a respiration rate between 6 to 9 breaths/min in a 5-min resting state. The followingresults were obtained: (i) Breathing oscillations with dominant frequencies at 0.1 Hz and0.15 Hz displayed a 1:1 coupling with RRI. (ii) Inspiration time was significantly longerthan expiration time. (iii) RRI minima (start of HR decrease) coincided with the earlyinspiration, and RRI maxima (start of HR increase) coincided with the late inspiration.(iv) RRI rhythm led over the respiratory rhythm. This phase-coupling pattern is quitecontrary to typical respiratory sinus arrhythmia where HR increases during inspirationand decreases during expiration.