Current medical and surgical management of Raynaud's syndrome
ABSTRACT Raynaud's syndrome (RS) is characterized by episodic digital ischemia induced by cold or emotional stress. Pathophysiologic mechanisms include temporary vasospasm and fixed digital artery obstruction. A number of pharmacologic and invasive therapies have been studied to treat RS symptoms; however, there are no specific treatments that are currently approved by the U.S. Food and Drug Administration specifically for RS. Of the available pharmacologic agents, calcium-channel blockers remain the preferred initial treatment for vasospastic RS, although many vasodilators have been studied and found to be efficacious. Vasodilators are less effective in treating digital artery obstruction, and no treatments have been found to be universally beneficial, although the phosphodiesterase V inhibitors have been gaining in popularity. Invasive therapies may have a role in selective cases. In this review, the current evidence of treatment for RS is summarized.
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ABSTRACT: Ectotherms in northern latitudes are seasonally exposed to cold temperatures. To improve survival under cold stress, they use diverse mechanisms to increase temperature resistance and prevent tissue damage. The accumulation of anti-freeze proteins that improve cold hardiness occurs in diverse species including plants, arthropods, fish, and amphibians. We previously identified an Ixodes scapularis anti-freeze glycoprotein, named IAFGP, and demonstrated its cold protective function in the natural tick host and in a transgenic Drosophila model. Here we show, in a transgenic mouse model expressing an anti-freeze glycoprotein, that IAFGP protects mammalian cells and mice from cold shock and frostbite respectively. Transgenic skin samples showed reduced cell death upon cold storage ex vivo and transgenic mice demonstrated increased resistance to frostbite injury in vivo. IAFGP actively protects mammalian tissue from freezing, suggesting its application for the prevention of frostbite, and other diseases associated with cold exposure.PLoS ONE 02/2015; 10(2):e0116562. DOI:10.1371/journal.pone.0116562 · 3.53 Impact Factor
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ABSTRACT: Raynaud's phenomenon (RP) is characterised by transient ischaemia in the extremities in response to cold or emotions. It can be primary (idiopathic) or secondary to an underlying disease. The pathophysiology of RP is multifactorial and complex. Microvascular impairment is a hallmark of the disease. The objective of this work is to review the different pharmacological treatments currently used in the management of RP, from their mechanism of action to the available evidence regarding their efficacy. We also propose to discuss potential pharmacological targets such as the potentiation of the nitric oxide pathway, or the inhibition of the RhoA-Rho kinase pathway. The last part of this review deals with drug-induced RP. Among various medications, beta-blockers, interferons, tyrosine-kinase inhibitors or cytotoxic agents such as bleomycin are involved.Thérapie 03/2014; 69(2):115-128. DOI:10.2515/therapie/2013068 · 0.40 Impact Factor
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ABSTRACT: Introduction: The management of Raynaud’s phenomenon in its most se- vere form is challenging, and current medical and surgical treatment meth- ods frequently do not lead to optimal symptom control and prevention of ischemic complications. The aim of the study was to critically evaluate all existing evidence on the use of botulinum toxin A in the management of Raynaud’s phenomenon. Material and methods: We adopted the PRISMA methodology and searched Cochrane Library, MEDLINE, SCOPUS, EULAR and ACR congresses abstract ar- chives for Raynaud* AND botulinum toxin OR onabotulinum. All studies that contained reports of botulinum toxin A use and its outcome in Raynaud’s phenomenon were included in the review. Results: Eleven studies met our inclusion criteria and involved a total of 125 patients. Two reviewers extracted data from the studies under review and achieved a consensus in their selection. The main outcomes measured were pain reduction and healing of digital ulcers. The level of evidence across studies was very low to moderate. Conclusions: There is insufficient evidence to assess the efficacy of botu- linum toxin A in Raynaud’s phenomenon. Despite many promising reports, further research in the form of randomized controlled trials is warranted in order to investigate this new treatment method for Raynaud’s phenomenon.Archives of Medical Science 12/2015; 11(6). DOI:10.5114/aoms.2015.48152 · 1.89 Impact Factor