| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
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| M&R | measure and record |
| MRA | magnetic resonance angiography; main renal artery; marrow repopulation activity; medical record anal... |
| MRF | Markov random field; medical record file; melanocyte-[stimulating hormone]-releasing factor; mesence... |
| OMR | oligomycin-resistant; online medical record |
| differential spinal anaesthesia | A form of diagnostic spinal anaesthesia producing blockade of different types of nerves in the subarachnoid space, based upon their differences in sensitivity to local anaesthetics; also observed during surgical spinal anaesthesia. (05 Mar 2000) |
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| dissociated anaesthesia | Loss of some types of sensation with persistence of others; most often used in context of nerve blocks, wherein a loss of sensation for pain and temperature occurs without loss of tactile sense. (05 Mar 2000) |
| dissociative anaesthesia | A form of general anaesthesia, but not necessarily complete unconsciousness, characterised by catalepsy, catatonia, and amnesia, especially that produced by phenylcyclohexylamine compounds, including ketamine. (05 Mar 2000) |
| infiltration anaesthesia | Anaesthesia produced by injection of local anaesthetic solution directly into an area that is painful or about to be operated upon. (05 Mar 2000) |
| inhalation anaesthesia | General anaesthesia resulting from breathing of anaesthetic gases or vapors. (05 Mar 2000) |
| insufflation anaesthesia | Maintenance of inhalation anaesthesia by delivery of anaesthetic gases or vapors directly to the airway of a spontaneously breathing patient. (05 Mar 2000) |
| intercostal anaesthesia | Regional anaesthesia produced by injection of local anaesthetic solution about intercostal nerves. (05 Mar 2000) |
| intramedullary anaesthesia | Rarely used method of general anaesthesia by injection of intravenous anaesthetic agent(s) into the medullary canal of long bones. Synonym: intraosseous anaesthesia. (05 Mar 2000) |
| intranasal anaesthesia | Insufflation anaesthesia in which an inhalation anaesthetic is added to inhaled air passing through the nose or nasopharynx; anaesthesia of nasal passages by infiltration and topical application of local anaesthetic solution to nasal mucosa. (05 Mar 2000) |
| intraoral anaesthesia | Insufflation anaesthesia in which an inhalation anaesthetic is added to inhaled air passing through the mouth; regional anaesthesia of the mouth and associated structures when local anaesthetic solutions are used by topical application to oral mucosa, by local infiltration, or as nerve blocks. (05 Mar 2000) |
| intraosseous anaesthesia | Rarely used method of general anaesthesia by injection of intravenous anaesthetic agent(s) into the medullary canal of long bones. Synonym: intraosseous anaesthesia. (05 Mar 2000) |
| intraspinal anaesthesia | Inaccurate synonym for spinal anaesthesia; local anaesthetic solutions are not injected into the spinal cord. (05 Mar 2000) |
| intratracheal anaesthesia | Inhalation anaesthesia technique in which anaesthetic and respiratory gases pass through a tube placed in the trachea via the mouth or nose. Synonym: intratracheal anaesthesia. (05 Mar 2000) |
| intravenous anaesthesia | General anaesthesia produced by injection of central nervous system depressants into the venous circulation. (05 Mar 2000) |
| intravenous regional anaesthesia | Regional anaesthesia by intravenous injection of local anaesthetic solution distal to an occlusive tourniquet in an extremity previously exsanguinated by pressure or gravity. Synonym: Bier's method. (05 Mar 2000) |