Acute opioid effects on human brain as revealed by functional magnetic resonance imaging.
Functional magnetic resonance imaging has been widely used to study brain activation induced either by specific sensory stimulation or motor or cognitive task performance. We demonstrate that functional magnetic resonance imaging can provide information of brain regions involved in opioid-induced central nervous system effects. The reproducibility of the responses in the predefined regions of interest was confirmed by repeated boluses of ultra-short acting mu-opioid receptor agonist remifentanil and saline. We report spatially and temporally detailed information after remifentanil administration. Areas rich in mu-opioid receptors showed strong activations, whereas primary somatosensory cortex that has the lowest density of mu-opioid receptors showed negligible activation. The cingulate, orbitofrontal, posterior parietal and insular cortices, and amygdala showed activation, which was temporally closely related to most subjective sensations that were strongest at 80 to 90 s after drug administration. These areas belong to a circuitry that modulates the affective experience of sensory stimuli.
Leppä
Mika
M
Department of Anesthesia and Intensive Care Medicine, Helsinki University Central Hospital, P.O. Box 340, FIN-00029 HUS, Finland.
Korvenoja
Antti
A
Carlson
Synnöve
S
Timonen
Paula
P
Martinkauppi
Sami
S
Ahonen
Jouni
J
Rosenberg
Per H
PH
Aronen
Hannu J
HJ
Kalso
Eija
E
D000328:Adult; D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000494:pharmacology*; D001921:Brain / Q000187:drug effects* / Q000502:physiology; D001931:Brain Mapping; D003071:Cognition / Q000187:drug effects*; D005260:Female; D007839:Functional Laterality; D006339:Heart Rate; D006801:Humans; D007262:Infusions, Intravenous; D008279:Magnetic Resonance Imaging; D008297:Male; D010100:Oxygen / Q000097:blood; D010880:Piperidines / Q000008:administration & dosage / Q000494:pharmacology*; D012016:Reference Values; D000077208:Remifentanil; D015203:Reproducibility of Results; D013028:Space Perception
D000701:Analgesics, Opioid; D010880:Piperidines; D000077208:Remifentanil; D010100:Oxygen