Complex regional pain syndrome

Apart from thermography and SPECT scanning, a variety of other tests have been advocated for the assessment of complex regional pain syndromes. These include quantitative sensory testing (QST), resting sweat output

(RSO), thermoregulatory sweat test (TST), quantitative sudomotor axon reflex testing (QSART), and sympathetic skin response (SSR). A comprehensive review found no compelling evidence of the utility of these investigations as diagnostic tests for complex regional pain syndrome.67 For QST, the review concluded that the findings are not specific for the disease and do not deliver relevant additional diagnostic information. It considered RSO, TST, and QSART useful in the research setting, but they are difficult to conduct and have little clinical applicability. The SSR is still affected by differences in technique used, and cannot be recommended in routine diagnosis of complex regional pain syndrome (CRPS).

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