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Immunotherapy Safety for the Primary Care ... - U.S. Coast Guard

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Pathophysiology<br />

• Histamine acts through H1 and H2 receptors<br />

– H1: pruritus, rhinitis, tachycardia, & bronchospasm<br />

– H1 & H2: headache, flushing, & hypotension<br />

• Leukotrienes (LTB 4 )<br />

– direct mast cell degranulation<br />

– chemotactic agents <strong>for</strong> late-phase inflammatory cells<br />

• Complement (C5a)<br />

– direct mast cell degranulation<br />

– Induce smooth muscle ctx, increase vascular perm

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