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Study aim
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The effect of local botulinum toxin A injection on the improvement of symptoms of Raynaud's phenomenon and digital ulcers in systemic sclerosis
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Design
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Thirty patients will be included in the study. Non-dominant hands of patients will be used as intervention group and the dominant hands of patients as control group.
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Settings and conduct
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Before the intervention, patients' demographic information and the results of physical examinations will be recorded. Then Quick DASH, pain score (VAS) and Raynaud's condition score (RCS) questionnaires will be completed. Then, 50 units of botulinum toxin will be mixed with 2.5 cc of normal saline. The injection sites are: second-forth interdigital webs (each one 10 units)، base of thumb (10 units) , second and fifth fingers (each 5 units). In the other hand, only normal saline will be injected in the same way. At end of months 1 and 4, patients will be reassessed.
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Participants/Inclusion and exclusion criteria
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Inclusion criteria: scleroderma diagnosis based on the American College of Rheumatology (ACR) and the European League Against Rheumatism (EULAR), age>18 years, bilateral Raynaud's phenomenon with an intensity of greater than 50 according to the Raynaud's condition score (RCS), pain intensity greater than 5 based on visual analog scale (VAS), dysfunction of the arm, shoulder and hand more than 50 according to the Quick Disabilities of the Arm, Shoulder and Hand (DASH) Questionnaire.
Exclusion criteria: Active infection in the hands, history of any botulinum toxin allergy, history of upper extremity vascular surgery, history of sympathectomy, pregnancy, breast feeding
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Intervention groups
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In the non-dominant hand, botulinum toxin A and into the dominant hand of each patient (as control), normal saline will be injected.
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Main outcome variables
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Symptoms of Raynauds's phenomenon; pain intensity; dysfunction of the arm, shoulder and hand