WebMay 1, 1991 · Abstract. The pathogenesis of primary Raynaud's phenomenon remains an enigma. Most evidence favors a local abnormality in the digital arteries as opposed to an increased activity of the sympathetic nervous system. The local fault may involve the alpha 2-adrenergic receptors, which are most important in reflex sympathetic vasoconstriction. WebRaynaud’s phenomenon is a complex vascular disorder in which blood vessels, particularly those in the fingers and toes, or rarely the tongue, nose, ears, lips, or nipples, overreact to cold temperature or emotional stress (Mayo Clinic 2011c; Herrick 2012; Martínez 2011). The blood vessels constrict (ie, vasoconstriction), reducing blood flow to the affected extremity.
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WebFeb 2, 2024 · Raynaud phenomenon (RP) is an exaggerated vasoconstrictive response of distal arteries and arterioles (most commonly in the fingers and toes) to cold or emotional stress. Primary RP is idiopathic, whereas secondary RP is caused by underlying systemic diseases (e.g., mixed connective tissue disease, vasculitides, medications).Both types … WebViscose rayon fiber used in the textile and apparel industries can be staple fiber or multifilament fiber. Figure 4.5 shows a typical fiber shape for a commercial viscose rayon … hiding heart sneakers
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WebRaynaud's phenomenon is characterised by episodic attacks of digital vasospasm and ischaemia on exposure to cold, or less commonly, emotional stress. This results in a characteristic triphasic colour change in extremities (usually in fingers or toes) white - ischaemia; then; blue - (deoxygenation) rewarming with a slow blood flow; then WebFeb 10, 2024 · Raynaud’s phenomenon (RP) is a relatively common condition with an overall prevalence of 1–8% in the general population, with higher prevalence in the colder climates. 1 It is important to distinguish RP from other disorders that cause digital discoloration, including acrocyanosis, pernio, and livedo reticularis (LR), as prognosis and treatment … WebRayon fabric is a material made from wood pulp. Manufacturers treat the pulp with a series of chemicals to change the structure of the cellulose into long filaments. The resulting … hiding heidi contrast sensitivity