Blood Vessels, Part 2 Flashcards
What does the clinical presentation of vasculitis depend on?
What type of vessel is most commonly affcted?
The vascular bed involved (CNS, heart, small bowel, etc.)
Arterioles, capillaries, venules.
Non-infectious vs. infectious vasculitis
Non-infectious: immune-mediated (immunosuppressive tx).
Infectious: direct invasion by pathogens.
How can infections indirectly induce non-infectious vasculitis?
By generating immune complexes or triggering cross-reactive immune response.
Immune complex vasculitis is a result of:
What diseases/states is it seen in? (3)
Deposition of Ag-Ab complexes in vascular walls.
SLE
Drug hypersensitivity (PCN, streptokinase)
Secondary exposure to infectious agent.
30% of Polyarteritis nodosa is associated w/:
HBsAg and anti-HBsAg
What are antineutrophil cytoplasmic Abs (ANCA)?
A group of Abs that react w/ cytoplasmic enzymes in neutrophil granules, monocytes and endothelial cells.
What are 2 major examples of ANCAs? Their associations?
Anti-proteinase-3 (PR3-ANCA) associated w/ polyangiitis
Anti-myeloperoxidase (MPO-ANCA) induced by RX propylthiouracil.
What do ANCA activate?
Neutrophils which release ROS
Why are ANCA considered “pauci-immune”?
Because the ANCA Ab directed against cellular constituents and do NOT form circulating immune complexes.
Giant cell arteritis and aortitis is most common vasculitis among which patients?
What is the presentation?
Older patients.
Constitutional complaints along w/ facial pain and headache.
What is Segmental Transmural necrotizing inflammation?
WBC inflammation/necrosis w/ a predilection for branch points. It spans the entire arterial wall.
What is the course of PAN?
Course is remitting and episodic.
What ANCA is microscopic polyangiitis associated with?
MPO-ANCA
What else is Microscopic polyangiitis known as? (2)
Leukocyte vasculitis or Hypersensitivity vasculitis
How does myocardial vessel vasospasm occur?
What is the outcome? (2)
Excessive vasoconstriction of myocardial as. or arterioles (cardiac Raynaud) and may cause ischemia or infarct. Usually occurs as a result of high levels of vasoactive mediators (epi, pheochromocytoma, cocaine).
Sudden cardiac death or Takotsubo cardiomyopathy (broken heart sybdrome assoc. w/ emotional distress).
What causes varicose veins?
Abn. dilation of veins w/ valvular incompetence, secondary to sustained intraluminal pressure.
Rarely embolizes.
What causes esophageal varices?
3 classes:
Portal HTN (often cirrhosis) opens a shunt to direct blood to veins at gastroesophageal junction.
Esophageal varices, hemorrhoids, caput medusae.
Thrombophlebitis is:
Includes which vessels?
Venous thrombosis and inflammation.
Almost always in deep vs. of leg.
What can cause Migratory thrombophlebitis (4)
Cancer pts. from a paraneoplastic syndrome.
Mucin-producing adenocarcinomas.
Spontaneous thromboses that form and resolve, etc.
Adenocarcinomas of lung, ovary, pancreas.
SVC syndrome cause:
Clinical picture:
Neoplasms compress or invade SVC.
Complex, but marked dilation of vs. in head, neck and arms w/ cyanosis.
Pulm. vessels can be compressed and lead to respiratory distress.
What 2 main cancers can lead to IVC syndrome?
Clinical picture?
Hepatocellular carcinoma and renal cell carcinoma tend to grow in the IVC and can lead all the way to the RA.
LE edema, venous distension in lower abdomen, massive proteinuria due to renal v. involvement*.
Most common agent in lymphangitis?
Grp A beta-hemolytic strep
Primary lymphedema cause:
Secondary or obstructive lymphedema cause:
Isolated congenital defect (Milroy DZ).
Blockage of normal lymph flow.
What is peau d’ orange?
Used to describe the skin overlying breast cancer where lymph is clogged with tumor cells.