X hits on this document

PDF document

Common Congenital Heart Lesions - page 110 / 126

342 views

0 shares

0 downloads

0 comments

110 / 126

110 of 126

Vasculitic Syndromes

Our book introduces four syndromes that fall into this category. Before outlining these syndromes, I’ll recap the relevant general information:

Vasculitis: inflammation of the vessel wall

  • Can result from:

    • 1.

      Immune complex deposition

    • 2.

      Cell-mediated immune reactions against the vessel wall

    • 1.

      Immune complexes activate complement cascade Æ get release of chemoattractants and anaphylatoxins Æ get increased vascular permeability Æ neutrophils come to the vessel wall Æ neutrophils injure the vessel with their lysosomal contents and toxic oxygen-derived free radicals.

2. Cell-mediated immune reactions: T cells bind vascular antigens Æ release lymphokines Æ attract additional lymphocytes and macrophages to the vessel wall.

Polyarteritis nodosa

Takayasu’s arteritis

Giant cell arteritis

Thromboangiitis obliterans (Buerger’s disease)

Arteries Commonly Affected

small to medium size (esp. renal, coronary, hepatic, skel musc)

aorta and its branches

medium to large size (esp. cranial, aortic arch & branches)

small size (esp. distal arteries of extremities)

Histology

PMNs, acute fibrinoid necrosis, aneurismal dilatation

Granulomatous arteritis w/ fibrosis; significant luminal narrowing

lymphocytes, intimal fibrosis, granuloma formation

inflammation and thrombosis without necrosis

  • These inflammatory processes can cause end-organ ischemia because of either vascular necrosis or local thrombosis.

  • Most Vasculitic Syndromes do not have known causes…they’re distinguished from each other by pattern of vessels involved and histologic characteristics.

Table of Vasculitic Syndromes (modified from p.336):

Now, for outlines of these syndromes…

Document info
Document views342
Page views342
Page last viewedFri Dec 09 10:27:21 UTC 2016
Pages126
Paragraphs5002
Words33792

Comments