Ann Rehabil Med.  2015 Feb;39(1):116-121. 10.5535/arm.2015.39.1.116.

Predictive Value of Sympathetic Skin Response in Diagnosing Complex Regional Pain Syndrome: A Case-Control Study

• Kim HJ
• Yang HE
• Kim DH
• Park YG

• KMID: 2273027
• DOI: http://doi.org/10.5535/arm.2015.39.1.116

Abstract

OBJECTIVE
To investigate the predictive value of the sympathetic skin response (SSR) in diagnosing complex regional pain syndrome (CRPS) by comparing three diagnostic modalities-SSR, three-phasic bone scans (TPBS), and thermography.
METHODS
Thirteen patients with severe limb pain were recruited. Among them, 6 were diagnosed with CRPS according to the proposed revised CRPS clinical diagnostic criteria described by the International Association for the Study of Pain. SSR was measured in either the hands or feet bilaterally and was considered abnormal when the latency was prolonged. A positive TPBS finding was defined as diffuse increased tracer uptake on the delayed image. Thermographic findings were considered positive if a temperature asymmetry greater than 1.00degrees C was detected between the extremities.
RESULTS
Five of 6 CRPS patients showed prolonged latency on SSR (83% sensitivity). TPBS was positive in the 5 CRPS patients who underwent TPBS (100% sensitivity). Thermography was positive in 4 of 5 CRPS patients who underwent the procedure (80% sensitivity). The remaining 7 non-CRPS patients differed on examination. SSR latencies within normal limit were noted in 4 of 7 non-CRPS patients (57% specificity). Results were negative in 4 of 5 non-CRPS patients who underwent TPBS (80% specificity), and negative in 3 of 5 non-CRPS patients who underwent thermography (60% specificity).
CONCLUSION
SSR may be helpful in detecting CRPS.

Keyword

Complex regional pain syndromes; Galvanic skin response; Radionuclide imaging; Thermography

MeSH Terms

Case-Control Studies*
Complex Regional Pain Syndromes
Extremities
Foot
Galvanic Skin Response
Hand
Humans
Radionuclide Imaging
Skin*
Thermography

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