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* when is rash blanchable? when it not?
 #277893  
  vinu14 - 03/06/08 17:11
 
  plz help ...in this concept guys...  
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* Re:when is rash blanchable? when it not?
#1206269
  mysam - 03/06/08 17:27
 
  Vinu read this article in it will help clear concept.

CLASSIFICATION AND DIFFERENTIAL DIAGNOSIS

All forms of purpura involve microvascular disruption leading to extravasation of erythrocytes into the surrounding dermis. Consequently, purpuric lesions do not blanch with pressure as do telangiectasias and erythema. Different descriptive terms based on size are used to describe purpura. Petechiae are areas of hemorrhage 3 mm or less, ecchymoses are purpuric lesions larger than 3 mm and contusions are purpuric lesions associated with soft tissue swelling, usually due to trauma.

The causes of purpura may be divided into three categories (Table 1). Intravascular causes are the result of platelet defects or coagulopathies, most of which present as nonpalpable purpura. The vascular causes include the palpable forms. Palpable purpura is usually caused by vasculitis but may have other causes, including trauma, emboli from endocarditis or cholesterol emboli. Extravascular (miscellaneous) causes of purpura are usually nonpalpable and include actinic (senile) purpura, corticosteroid reactions and scurvy.[3]

source: http://findarticles.com/p/articles/mi_m3225/is_n5_v52/ai_17640111
 
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* Re:when is rash blanchable? when it not?
#1206314
  vinu14 - 03/06/08 17:58
 
  hi
thank u so much mysam.
 
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