Abstract:
BACKGROUND:The spinal cord is an important site where volatile anesthetics decrease sensation and produce immobility. Beyond this knowledge, our understanding of a site of anesthetic action is limited. Previous evidence suggests that dorsal horn neurons with ascending projections may be more susceptible to depression by general anesthetics than local spinal interneurons. In this study we evaluated the effects of volatile and injectable general anesthetics on lumbar dorsal horn neurons with and without ascending projections. METHODS:Thirty-seven adult male rats underwent laminectomies at C1, for placement of a stimulating electrode, and T13/L1, for extracellular recording from the spinal cord dorsal horn. Neuronal responses to heat were evaluated under two doses of halothane, isoflurane, or propofol anesthesia. RESULTS:Under both halothane and isoflurane anesthesia, increasing the dose from 0.8 to 1.2 minimum alveolar concentration (MAC) had no significant effect on heat-evoked responses in neurons that had ascending projections identified via antidromic stimulation (AD) or those without ascending projections (nAD). Heat responses in AD neurons 1 min after i.v. administration of 3 and 5 mg/kg of propofol were reduced to 60% +/- 18% (mean +/- SE) and 39% +/- 14% of control respectively. Similarly, in nAD neurons responses were reduced to 56% +/- 14% and 50% +/- 10% of control by 3 and 5 mg/kg propofol respectively. CONCLUSIONS:Our findings suggest, at peri-MAC concentrations, these general anesthetics do not preferentially depress lumbar dorsal horn neurons with ascending projections compared to those with no identifiable ascending projections.
journal_name
Anesth Analgjournal_title
Anesthesia and analgesiaauthors
Barter LS,Mark LO,Jinks SL,Carstens EE,Antognini JFdoi
10.1213/ane.0b013e318163f8f3subject
Has Abstractpub_date
2008-03-01 00:00:00pages
985-90, table of contentsissue
3eissn
0003-2999issn
1526-7598pii
106/3/985journal_volume
106pub_type
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