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2015 ; 593
(5
): 1183-96
Nephropedia Template TP
gab.com Text
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English Wikipedia
Visually induced nausea causes characteristic changes in cerebral, autonomic and
endocrine function in humans
#MMPMID25557265
Farmer AD
; Ban VF
; Coen SJ
; Sanger GJ
; Barker GJ
; Gresty MA
; Giampietro VP
; Williams SC
; Webb DL
; Hellström PM
; Andrews PL
; Aziz Q
J Physiol
2015[Mar]; 593
(5
): 1183-96
PMID25557265
show ga
An integrated understanding of the physiological mechanisms involved in the
genesis of nausea remains lacking. We aimed to describe the psychophysiological
changes accompanying visually induced motion sickness, using a motion video,
hypothesizing that differences would be evident between subjects who developed
nausea in comparison to those who did not. A motion, or a control, stimulus was
presented to 98 healthy subjects in a randomized crossover design. Validated
questionnaires and a visual analogue scale (VAS) were used for the assessment of
anxiety and nausea. Autonomic and electrogastrographic activity were measured at
baseline and continuously thereafter. Plasma vasopressin and ghrelin were
measured in response to the motion video. Subjects were stratified into quartiles
based on VAS nausea scores, with the upper and lower quartiles considered to be
nausea sensitive and resistant, respectively. Twenty-eight subjects were exposed
to the motion video during functional neuroimaging. During the motion video,
nausea-sensitive subjects had lower normogastria/tachygastria ratio and cardiac
vagal tone but higher cardiac sympathetic index in comparison to the control
video. Furthermore, nausea-sensitive subjects had decreased plasma ghrelin and
demonstrated increased activity of the left anterior cingulate cortex. Nausea VAS
scores correlated positively with plasma vasopressin and left inferior frontal
and middle occipital gyri activity and correlated negatively with plasma ghrelin
and brain activity in the right cerebellar tonsil, declive, culmen, lingual gyrus
and cuneus. This study demonstrates that the subjective sensation of nausea is
associated with objective changes in autonomic, endocrine and brain networks, and
thus identifies potential objective biomarkers and targets for therapeutic
interventions.