Effect of systemic adenosine on pain and secondary hyperalgesia associated with the heat/capsaicin sensitization model in healthy volunteers.

Abstract:

BACKGROUND AND OBJECTIVES:Adenosine is an endogenous compound that may have analgesic effects. Results from clinical trials are not consistent, however, and there is a need for large-scale, randomized, placebo-controlled studies to clarify the role of adenosine in the treatment of pain states, including acute nociceptive pain and pain involving central sensitization. METHODS:The analgesic and antihyperalgesic effect of systemic adenosine on the heat/capsaicin sensitization model of experimental pain was investigated in 25 healthy human volunteers. Sensitization was produced by heating the skin to 45 degrees C for 5 minutes, followed by a 30-minute application of 0.075% capsaicin cream, and maintained by periodically reheating the sensitized skin to 40 degrees C for 5 minutes at 40-minute intervals. Subjects received intravenous adenosine 60 microg/kg/min or saline for 85 minutes. Areas of secondary hyperalgesia to von Frey hair and brush stimulation, heat-pain detection thresholds (HPDTs) in normal and sensitized skin, and painfulness of stimulation with 45 degrees C for 1 minute (LTS) in normal skin were quantified before, during, and after study drug infusion. RESULTS:Systemic adenosine had no effect on the area of secondary hyperalgesia to von Frey hair or brush stimulation, HPDT in normal or sensitized skin, or painfulness of LTS in normal skin. CONCLUSION:We conclude that adenosine has no effect on acute nociceptive pain induced by heat stimulation or on secondary hyperalgesia induced by heat/capsaicin sensitization in healthy volunteers.

journal_name

Reg Anesth Pain Med

authors

Dirks J,Petersen KL,Rowbotham MC,Dahl JB

doi

10.1053/rapm.2001.22256a

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

414-9

issue

5

eissn

1098-7339

issn

1532-8651

pii

S1098-7339(01)22960-5

journal_volume

26

pub_type

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