{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T19:35:39Z","timestamp":1790969739791,"version":"4.1.0"},"reference-count":25,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2005,6,1]],"date-time":"2005-06-01T00:00:00Z","timestamp":1117584000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Anaesth Intensive Care"],"published-print":{"date-parts":[[2005,6]]},"abstract":"<jats:p>Identifying the central nervous system sites of action of anaesthetics is important for understanding the link between their molecular actions and clinical effects. The aim of the present pilot study was to compare the anaesthetic effect of bilateral microinjections of propofol and thiopentone (both 200 \u03bcg\/\u03bcl, in Intralipid and 0.9% saline respectively) into a recently discovered anaesthetic-sensitive region in the rat brainstem, the \u201cmesopontine tegmental anaesthetic area\u201d (MPTA). Microinjections (1 \u03bcl per side) were made into the MPTA of fifteen male Sprague-Dawley rats. The effect of each agent on spontaneous behaviour, postural control and nociceptive responsiveness was subjectively assessed according to established criteria. The main finding was that thiopentone induced an \u201canaesthesia-like\u201d state, including complete atonia and loss of righting ability, in 20% of the subjects. Overall, thiopentone significantly reduced postural control and had a moderate antinociceptive effect compared to saline microinjections (P&lt;0.01 and 0.05, respectively, Wilcoxon test). In contrast, propofol did not induce \u201canaesthesia\u201d in any animal tested, although a similar antinociceptive effect to that of thiopentone was observed (P&lt;0.05, Wilcoxon test). In summary, propofol and thiopentone have different effects when microinjected into the MPTA. While both agents reduced reflex withdrawal to a nociceptive stimulus, only thiopentone induced an \u201canaesthesia-like\u201d state.<\/jats:p>","DOI":"10.1177\/0310057x0503300313","type":"journal-article","created":{"date-parts":[[2019,1,16]],"date-time":"2019-01-16T04:05:54Z","timestamp":1547611554000},"page":"373-380","source":"Crossref","is-referenced-by-count":27,"title":["Differential Anaesthetic Effects following Microinjection of Thiopentone and Propofol into the Pons of Adult Rats: A Pilot Study"],"prefix":"10.1177","volume":"33","author":[{"given":"L. 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