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The diagnosis of reflex sympathetic dystrophy using an algometer
A S Bryan1, L Klenerman, D Bowsher
1Royal Liverpool Hospital, England.
Summary
Patients with reflex sympathetic dystrophy (RSD) exhibit a significantly lower pressure-pain threshold in affected limbs. This finding may aid in the earlier diagnosis of RSD and monitor recovery over time.
Area of Science:
- Neurology
- Pain Medicine
- Clinical Research
Background:
- Reflex sympathetic dystrophy (RSD), also known as complex regional pain syndrome, is a chronic pain condition.
- Early diagnosis and objective measurements are crucial for effective management of RSD.
Purpose of the Study:
- To investigate the pressure-pain threshold (PPT) in patients with reflex sympathetic dystrophy.
- To determine if PPT can serve as an objective diagnostic marker for RSD.
- To assess the temporal changes in PPT during recovery.
Main Methods:
- Prospective study involving 33 patients diagnosed with reflex sympathetic dystrophy.
- Measurement of pressure-pain thresholds in both affected and unaffected limbs.
- Repeated testing over an average of 49 days to track changes.
Main Results:
- A statistically significant lower pressure-pain threshold was observed in the affected limbs compared to unaffected limbs.
- Reduced pain thresholds were consistently found in upper limb involvement (18/18 patients).
- A slower return to normal PPT was noted in patients with lower limb involvement, potentially due to later referral.
Conclusions:
- Estimation of pressure-pain thresholds is a valuable tool for the earlier diagnosis of reflex sympathetic dystrophy.
- PPT measurements can potentially monitor disease progression and recovery.
- Differences in PPT findings between upper and lower limb involvement warrant further investigation regarding referral timing.