Reliability analysis of load and pain assessment using the SORRI® monofilaments in patients with migraine

Abstract

The objective was to evaluate allodynia and verify the reliability of the pain response and the actual load applied by monofilament SORRI® in patients with migraine and to identify the relationship between these variables. We evaluated 40 women , 20 migraine group (GM) and 20 control group (CG) aged 18-55 years in two assessments of sensitivity with an interval of 15 minutes in five regions: Front and masseter muscles bilaterally and right forearm. We also applied the technique of brush and only the GM Questionnaire-12 ASC Brazil. To check the actual load monofilaments were coupled to the load cell of the Electronic von frey IITC Life Science Inc.. In GC 10% reported pain with the application monofilament and GM 70%, 7% of these were classified as mild allodynia, 35% moderate and 57% severe allodynia and 35% also reported pain in the brush technique. The reliability of pain assessment was calculated by correlation index Kappa and a variation was observed concordance of poor to moderate (0.167 to 0.692) in GM and there was no change in GC. The reliability of the actual load applied was calculated by Intraclass Correlation Coefficient (ICC) and demonstrated that all monofilament showed a variation between poor to excellent. We observed a change in load in relation to the pre-set 150% monofilament green, 0 to 50% for the blue and from 0.5 % to 25 % for purple and red and orange. The reliability of freight and reporting pain of monofilament of SORRI® are variable and therefore should not be used as the only tool in the evaluation of the sensitivity of the face of patients with migraine.