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  • Title: Assessment of endothelial function in complex regional pain syndrome type I using iontophoresis and laser Doppler imaging.
    Author: Gorodkin R, Moore T, Herrick A.
    Journal: Rheumatology (Oxford); 2004 Jun; 43(6):727-30. PubMed ID: 15026582.
    Abstract:
    OBJECTIVES: To assess microvascular endothelial function in patients with complex regional pain syndrome type I (CRPS) compared with healthy controls, as measured by iontophoresis of vasoactive chemicals and laser Doppler imaging. METHODS: Microvascular blood flow was stimulated locally in affected and contralateral limbs of patients with CRPS (n = 17) and in control subjects (n = 16) using iontophoresis of the endothelial-dependent vasodilator acetylcholine (ACh) and the endothelial-independent vasodilator sodium nitroprusside (NaNP). Changes in blood flow were measured using laser Doppler imaging. Comparisons were made between right and left limbs and between patients and controls. RESULTS: No significant differences in blood flow [expressed as a median percentage increase from baseline (interquartile range)] were detected between affected and contralateral limbs in patients with CRPS for ACh [affected 237 (95-344); unaffected 251 (152-273)] or for NaNP [affected 102 (49-300); unaffected 190 (53-218)]. In addition, there were no significant differences between patients and healthy controls [controls, ACh 216 (119-316); controls, NaNP: 122 (48-249)]. CONCLUSIONS: In this pilot study, CRPS was not associated with impairment of microvascular endothelial function. This may be a true result or may reflect the diversity of the CRPS disease process.
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