60
Participants
Start Date
January 31, 2006
Primary Completion Date
May 31, 2006
Study Completion Date
May 31, 2006
Dipyrone administration
Dipyrone 2 g (Nolotil®, Europharma, Madrid, Spain); one ampoule in 50 mL of 0.9% saline solution as an intravenous infusion over 10 min.
Pain assessment
"Pain will be evaluated by the patient according to a 100-mm visual analogue scale (VAS) (from point 0 no pain to point 10 unbearable pain)."
beta-endorphin immunoreactivity
Plasma beta-EPIr levels will be measured by an immunoradiometric assay (Allegro Beta-endorphin, Nichols Institute Diagnostics, SAN JUAN DE CAPISTRANO, CA) (normal values 29-40 pg/mL). It will be obtained by venous blood samples (5 mL) at the same time points at pain will be measured.
Placebo administration
Placebo in 50 mL of 0.9% saline solution as an intravenous infusion over 10 min.
Nursing and Physiotherapy Department, Madrid
Antonio Martín Duce
OTHER