The central autonomic network at rest: Uncovering functional MRI correlates of time-varying autonomic outflow

• Published in: NeuroImage (Orlando, Fla.) Vol. 197; pp. 383 - 390
• Main Authors: Valenza, G., Sclocco, R., Duggento, A., Passamonti, L., Napadow, V., Barbieri, R., Toschi, N.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 15.08.2019; Elsevier Limited
• Subjects: Adult; Autonomic nervous system; Autonomic Nervous System - physiology; Biomarkers; Blood pressure; Brain; Brain - physiology; Brain Mapping; Central autonomic network; Coma; Cortex (cingulate); Cortex (frontal); Cortex (parietal); Estimates; Female; Frontal gyrus; Functional magnetic resonance imaging; Heart rate; Heart Rate - physiology; Heart rate variability; Hispanic Americans; Human connectome project; Humans; Infants; Localization; Magnetic Resonance Imaging; Male; Neural Pathways - physiology; Neurosciences; Operculum; Oscillations; Parasympathetic nervous system; Point process; Prefrontal cortex; Presupplementary motor area; Respiration; Supplementary motor area; Thalamic nuclei; Thalamus; Time Factors; Vagus Nerve - physiology; Young Adult; Human connectome project; Autonomic nervous system; Heart rate variability; Point process; Central autonomic network
• DOI: 10.1016/j.neuroimage.2019.04.075
• ISSN: 1053-8119; 1095-9572

Peripheral measures of autonomic nervous system (ANS) activity at rest have been extensively employed as putative biomarkers of autonomic cardiac control. However, a comprehensive characterization of the brain-based central autonomic network (CAN) sustaining cardiovascular oscillations at rest is missing, limiting the interpretability of these ANS measures as biomarkers of cardiac control. We evaluated combined cardiac and fMRI data from 34 healthy subjects from the Human Connectome Project to detect brain areas functionally linked to cardiovagal modulation at rest. Specifically, we combined voxel-wise fMRI analysis with instantaneous heartbeat and spectral estimates obtained from inhomogeneous linear point-process models. We found exclusively negative associations between cardiac parasympathetic activity at rest and a widespread network including bilateral anterior insulae, right dorsal middle and left posterior insula, right parietal operculum, bilateral medial dorsal and ventrolateral posterior thalamic nuclei, anterior and posterior mid-cingulate cortex, medial frontal gyrus/pre-supplementary motor area. Conversely, we found only positive associations between instantaneous heart rate and brain activity in areas including frontopolar cortex, dorsomedial prefrontal cortex, anterior, middle and posterior cingulate cortices, superior frontal gyrus, and precuneus. Taken together, our data suggests a much wider involvement of diverse brain areas in the CAN at rest than previously thought, which could reflect a differential (both spatially and directionally) CAN activation according to the underlying task. Our insight into CAN activity at rest also allows the investigation of its impairment in clinical populations in which task-based fMRI is difficult to obtain (e.g., comatose patients or infants). •We combine fMRI with instantaneous autonomic outflow estimates•The central autonomic network (CAN) sustains cardiovascular oscillations at rest•Cardio-vagal and CAN activities at rest are negatively correlated•CAN activity at rest involves much wider brain networks than previously thought