ABSTRACT
In this study, we investigated whether spinal noradrenergic and serotonergic systems are involved in the antinociception induced by the novel pyrazolines 3-methyl- and 3-phenyl-5-hydroxy-5-trichloromethyl-4,5-dihydro-1H-1-pyrazole-1-carboxyamide (MPCA and PPCA, respectively), and the pyrazolinone dipyrone in the acetic acid writhing (stretching) test in mice. Intrathecal (i.t.) administration of methysergide (3 and 10 microg) and yohimbine (3 microg), but not of prazosin (0.3 and 1 microg) prevented the antinociceptive action of MPCA and PPCA (500 micromol/kg, s.c.). Dipyrone-induced antinociception (500 micromol/kg, s.c.) was not affected by methysergide or adrenoceptor antagonists. These results suggest that spinal 5-HT receptors and alpha2-adrenoceptors are involved in the antinociception induced by MPCA and PPCA, but not in that elicited by dipyrone.
Subject(s)
Analgesics/antagonists & inhibitors , Analgesics/pharmacology , Dipyrone/pharmacology , Pyrazoles/pharmacology , Receptors, Adrenergic, alpha-2/physiology , Receptors, Serotonin/physiology , Animals , Dose-Response Relationship, Drug , Male , Mice , Pain Measurement/drug effects , Pain Measurement/methods , Pyrazoles/antagonists & inhibitorsABSTRACT
The thorny second-look problem is examined on the basis of personal experience of 65 cases of intestinal infarction over a period of 10 years. The medical literature is particularly lacking in indications on this point and only from careful assessment of reported experience and personal experience itself has it been possible to find indications and limitations. Data are reported which do not pretend to be absolute but do provide a useful aid for those faced with doubtful anatomopathological pictures during operation for acute intestinal ischaemia.
