Experimental animal and clinical human data suggest that electroacupuncture (EAP) reduces the release of substance P from sensitive neurons, both at medullar level and in the periphery. Aim of our study is to verify the effect of different intensities of stimulation on edema induced
by subcutaneous administration of capsaicin. The study was performed on 72 male Sprague- Dawley rats divided into 4 experimental groups according to the intensity of electrostimulation (5,10,50,70 mA) and a control group. A constant current electrical stimulator delivering positive and negative
biphasic wave (duration of one pulse wave complex: 500 Î¼sec; pulse repetition rate: 5/sec) has been used for the stimulation. The lowest intensity of stimulation (5 mA) was effective in the prevention of neurogenic edema. Conversely, higher stimulation intensities, namely 10
and 50 mA, were not effective in reducing edema. Stimulation at 70 mA caused a worsening of edema, probably due to an increased release of substance P in the paw.
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Electrical stimulation intensity;
Document Type: Research Article
Research Professor of Anesthesiology and Intensive Care, Department of Pharmacology and Anesthesiology, University of Padova; Head of Pain Service and Palliative Care Unit of I.0.V.(Istituto Oncologico Veneto)- IRCCS; A.I.R.A.S. Padova,
Department of Pharmacology and Anesthesiology, University of Padova; I.O.V.(lstituto Oncologico Veneto)- IRCCS; A.I.R.A.S. - Padova, Italy
Head of Neurorehabilitation Service of the Rehabilitation Center of Montescano, Maugeri Foundation, IRCCS, Pavia, Italy
Department of Biologica Chemistry, University of Padova, A.I.R.A.S. - Padova. Italy
Full Professor of Anestehesiology and Intensive Care, Department of Pharmacology and Anesthesiology, University of Padova. Italy
Publication date: January 1, 2008