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Tissue hypoxia in complex regional pain syndrome
M Koban1, S Leis, S Schultze-Mosgau
1Neurologische Klinik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstrasse 17, D-91054 Erlangen, Germany.
Pain
|July 12, 2003
Summary
This study reveals that complex regional pain syndrome (CRPS) causes significant skin hypoxia, or low oxygen levels, in affected limbs. This impaired blood flow may contribute to severe, long-term CRPS symptoms like tissue atrophy.
Area of Science:
- Pain Medicine
- Physiology
- Medical Diagnostics
Background:
- Complex Regional Pain Syndrome (CRPS) can lead to severe limb atrophy in chronic stages.
- The underlying mechanisms, particularly tissue hypoxia, require further investigation.
Purpose of the Study:
- To investigate tissue hypoxia as a potential mechanism for late-stage CRPS symptoms.
- To quantify skin capillary hemoglobin oxygenation (HbO(2)) in CRPS patients.
Main Methods:
- Non-invasive measurement of skin capillary HbO(2) using spectrophotometry (EMPHO).
- Comparison of oxygenation levels at rest and during reactive hyperemia between affected and unaffected limbs in CRPS patients and control groups.
- Inclusion of healthy controls and surgery patients with edema to isolate CRPS-specific effects.
Main Results:
- CRPS patients exhibited significantly decreased HbO(2) in the affected limb compared to the unaffected limb and controls.
- Both limbs of CRPS patients showed reduced HbO(2) compared to controls.
- Postischemic hyperoxygenation was impaired in the affected limb of CRPS patients.
- Edema in a control group did not significantly alter HbO(2) levels, suggesting hypoxia is specific to CRPS.
Conclusions:
- Skin hypoxia is present in CRPS patients.
- Impaired nutritive blood flow due to hypoxia may contribute to atrophy and ulceration in chronic CRPS.
- Edema alone does not explain the observed hypoxia in CRPS.