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Antihistamines, particularly H1 blockers, are used to counteract the vasodilatory and bronchoconstrictive effects of histamine in anaphylaxis.
What is the primary mechanism of action of antihistamines in the management of anaphylaxis?
1) Blocking the release of mediators from mast cells
2) Directly counteracting the effects of histamine on H1 receptors
3) Acting on beta-2 adrenergic receptors to dilate bronchioles
4) Inhibiting the production of leukotrienes and prostaglandins
In minimal-change disease, the primary mechanism of proteinuria is thought to be increased permeability of the glomerular capillary wall to proteins due to changes in the glomerular basement membrane, rather than structural damage to the membrane itself.
What is the primary mechanism by which proteinuria occurs in minimal-change disease?
1) Increased glomerular permeability due to alterations in the glomerular basement membrane
2) Immune complex deposition in the glomeruli
3) Alteration in the podocyte slit diaphragm
4) Reduced synthesis of plasma proteins
The sudden onset of pain, redness, and swelling of the skin, particularly in a patient with poorly controlled diabetes, suggests a bacterial infection such as cellulitis.
A 50-year-old male with a history of type 2 diabetes mellitus presents with sudden onset of severe, painful, and reddened skin on the dorsum of his foot. His blood glucose is 350 mg/dL. Which of the following is the most likely diagnosis?
1) Cellulitis
2) Diabetic neuropathic ulcer
3) Pyoderma gangrenosum
4) Erythema multiforme
In liver disease, especially cirrhosis, there is a decrease in hepatic synthesis of clotting factors, particularly factor II (prothrombin). Vitamin K deficiency is also common in liver disease, which further contributes to hypoprothrombinemia. The deficiency of fibrinogen (factor I) would also result in a bleeding diathesis but is less common in liver disease. Factors V and VIII are also synthesized in the liver but are less frequently affected than factor II in such cases.
A patient with a history of liver cirrhosis develops a hemorrhagic tendency. Which coagulation factor is likely to be deficient?
1) Factor I (Fibrinogen)
2) Factor II (Prothrombin)
3) Factor V
4) Factor VIII
Proper glycemic control is essential for wound healing in diabetic patients. Elevated blood glucose levels impair the immune response and can worsen the ulcer.
A 55-year-old diabetic patient presents with a non-healing foot ulcer. What is the most critical component of the initial management?
1) Antibiotic therapy
2) Wound debridement
3) Control of blood glucose
4) Reconstructive surgery
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