Related Experiment Videos
Value of autonomic testing in reflex sympathetic dystrophy
T C Chelimsky1, P A Low, J M Naessens
1Department of Neurology, Case Western Reserve University, Cleveland, Ohio, USA.
Mayo Clinic Proceedings
|November 1, 1995
Summary
Reflex sympathetic dystrophy (RSD) diagnosis is strongly linked to sweating abnormalities. Early limb warmth and shorter pain duration predict better response to sympathetic block treatment for chronic pain.
Area of Science:
- Neurology
- Pain Management
- Autonomic Dysfunction
Background:
- Reflex sympathetic dystrophy (RSD) is a complex chronic pain condition.
- Characterizing RSD and predicting treatment response are critical for patient management.
Purpose of the Study:
- To characterize reflex sympathetic dystrophy (RSD).
- To identify factors predicting successful sympathetic block outcomes.
Main Methods:
- Retrospective analysis of 396 patients with chronic limb pain.
- Utilized autonomic function tests: resting sweat output (RSO), resting skin temperature (RST), and quantitative sudomotor axon reflex test (QSART).
- Assessed clinical endpoints including pain relief and a composite RSD diagnostic score.
Main Results:
- Increased RSO and abnormal QSART were highly specific for diagnosing RSD (98% combined specificity).
- Shorter pain duration correlated with warmer limbs, irrespective of RSD diagnosis.
- Response to sympathetic block was predicted by limb warmth (RST) and QSART in the leg, and shorter arm pain duration.
Conclusions:
- Abnormalities in sweating (RSO) strongly correlate with the clinical presentation of RSD.
- Resting skin temperature (RST) may be a superior predictor of sympathetic block response compared to clinical findings.
- Findings suggest a potential disease progression and support the role of autonomic dysfunction in chronic pain.