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  Raynaud's disease  
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 Raynaud's disease  

 

 


What is Raynaud's phenomenon?
Raynaud's phenomenon (RP) is a condition resulting in a particular series of discolorations of the fingers and/or the toes after exposure to changes in temperature (cold or hot) or emotional events. Skin discoloration occurs because an abnormal spasm of the blood vessels causes a diminished blood supply to the local tissues. Initially, the digit(s) involved turn white because of the diminished blood supply. The digit(s) then turn blue because of prolonged lack of oxygen. Finally, the blood vessels reopen, causing a local "flushing" phenomenon, which turns the digit(s) red. This three-phase color sequence (white to blue to red), most often upon exposure to cold temperature, is characteristic of RP.

Raynaud's phenomenon most frequently affects women, especially in the second, third, or fourth decades of life. People can have Raynaud's phenomenon alone or as a part of other rheumatic diseases. When it occurs alone, it is referred to as "Raynaud's disease" or primary Raynaud's phenomenon. When it accompanies other diseases, it is called secondary Raynaud's phenomenon.


What causes Raynaud's phenomenon?
The causes of primary and secondary RP are unknown. Both abnormal nerve control of the blood-vessel diameter and nerve sensitivity to cold exposure have been suspected as being contributing factors. The characteristic color changes of the digits are in part related to initial blood-vessel narrowing due to spasm of the tiny muscles in the wall of the vessels, followed by sudden opening (dilation), as described above. The small arteries of the digits can have microscopic thickness of their inner lining, which also leads to abnormal narrowing of the blood vessels.

How is Raynaud's phenomenon treated?
Management of Raynaud's phenomenon involves protecting the fingers and the toes from cold, trauma, and infection. Medications that can aggravate blood vessel spasm should be avoided by patients with RP. In patients with persistent symptoms, medications that dilate the blood vessels can be administered.

Patients with Raynaud's phenomenon who have no symptoms other than the color changes of extremities may require only measures to prevent complications. Prevention measures are important in primary and secondary RP regardless of the severity. Simple initial care involves keeping the body warm, especially the extremities. Warm clothing in colder environments is essential. Cotton gloves can be helpful while searching the freezer. Room temperatures should not be too cool. Rubber gloves protect the hands and prevent cooling while washing dishes. Barefoot walking should be minimized. Compression of the blood vessels by tight-fitting wrist bands, rings, or footwear should be avoided.

Those with RP should guard their hands and feet from direct trauma and wounds. Any wounds or infections should be treated early to prevent more serious infections. Avoiding emotional stresses and tools that vibrate the hand may reduce the frequency of attacks. Biofeedback can also help to decrease the severity and frequency of RP in some patients.

Direct and indirect (passive) smoking should be avoided by patients with RP. The chemicals in tobacco smoke can cause blood-vessel constriction and lead to atherosclerosis (hardening of the arteries), which can further impair oxygen supply to the extremities.

Care of the nails must be done carefully to avoid injuring sensitive toes and fingertips. Ulcers on the tips of the digits should be monitored closely by the doctor. These can become infected. Gently applied finger splints are used to protect ulcerated areas. Ointments that open the blood vessels (nitroglycerin ointment) are sometimes used on the sides of severely affected digits to allow increased blood supply and healing.

Medications that can aggravate symptoms of RP by leading to increased blood-vessel spasm include over-the-counter cold and weight-control preparations, such as pseudoephedrine (Actifed, Chlor-Trimeton, Cotylenol, and Sudafed). Beta blockers, medicines used for high blood pressure and heart disease, can also worsen RP. These include atenolol (Tenormin), metoprolol (Lopressor), nadolol (Corgard), and propranolol.






 


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