In addition to direct invasion of the vascular wall by an infectious agent, this pathogenic mechanism is a common cause of vasculitis?
A) Necrotizing granulomatous
B) Tissue necrosis
C) Mononuclear cells
D) Immune-mediated inflammation
Ans: D
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The two most common pathogenic mechanisms of vasculitis are direct invasion of the vascular wall by an infectious agent and immune-mediated inflammation. The most common mechanisms that initiate noninfectious vasculitis are pathological immune responses that result in endothelial activation, with subsequent vessel obstruction, and ischemia of the dependent tissue. In almost all forms of vasculitis, the triggering event initiating and driving the inflammatory process is unknown. Medium-size vessel vasculitides produce necrotic tissue damage. Large-vessel vasculitides involve mononuclear cells. Wegener granulomatosis is characterized by a triad of acute necrotizing granulomatous lesions of the upper respiratory tract (ear, nose, sinuses, and throat), necrotizing vasculitis of the affected small- to medium-sized vessels of the lungs and respiratory airways, and renal disease in the form of focal necrotizing glomerulonephritis.
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