Effects of propofol on beta-adrenoceptor-mediated signal transduction in cardiac muscle; role of cAMP / 대한마취과학회지

BACKGROUND: Propofol may decrease myocardial contractility via actions on the beta-adrenoceptor-mediated signal transduction. The aim of this study was to evaluate the effect of propofol via beta-adrenoceptor-mediated signal transduction by measuring the tissue levels of cAMP (cyclic adenosine monophosphate). METHODS: The effects of propofol on beta-adrenoceptor mediated cascades were measured with cAMP concentrations, which were stimulated by agonists (l-isoproterenol, GTPgammaS, and forskolin) of each step of beta-adrenoceptor-mediated cascades. RESULTS: While the production of cAMP stimulated by isoproterenol, GTPgammaS, or forskolin are increased (P < 0.05), application of each concentration of propofol (0.1, 1, 10, 100 micrometer) did not alter the levels of cAMP. CONCLUSIONS: Considering that propofol did not alter the tissue cAMP levels when stimulated by isoproterenol, GTPgammaS, and forskolin, propofol appears to have no effect on the beta-adrenoceptor signaling pathway in guinea pig ventricular myocardium.

Facial paralysis after spine surgery : A case report

diopathic facial nerve paralysis after surgery is not common but has clinical significance. We report a case of facial nerve paralysis in the immediate postanesthetic period after cervical spine surgery. A 41-year-old man with cervical herniated disc was scheduled for cervical laminectomy. After uneventful surgery, he suffered from left facial numbness and weakness. Imaging study and audiogram couldn't reveal any anatomic abnormality except Thornwaldt cyst. Conservative treatment with steroids and antivirals resolved his symptoms until 16th day after surgery.