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A 25-year-old woman is evaluated for daily nosebleeds for the last year. The nosebleeds often begin in the morning upon awakening and are easily controlled. She states that she also had daily nosebleeds as a child. She denies any recent illness, fever, chills, or weight loss. She takes no medications. Her mother and sister also have chronic nosebleeds. Her laboratory results are shown below.Hemoglobin 13.0 g/dLLeukocyte count 6,000/mm3Platelets 250,000/mm3Prothrombin time 15 secondsActivated partial thromboplastin time 45 secondsBleeding time 12 minutes The patient is given the first-line treatment for her disease. What is this medication's composition and/or mechanism of action?Ask StudybuddyGroup of answer choicesRelease of von Willebrand factor from endothelial cellsRepletion of factors II, V, VII, IX, X, and XIInhibition of carboxylation via g-glutamyl carboxylaseRepletion of factor VIII and von Willebrand factor

Question

A 25-year-old woman is evaluated for daily nosebleeds for the last year. The nosebleeds often begin in the morning upon awakening and are easily controlled. She states that she also had daily nosebleeds as a child. She denies any recent illness, fever, chills, or weight loss. She takes no medications. Her mother and sister also have chronic nosebleeds. Her laboratory results are shown below.Hemoglobin 13.0 g/dLLeukocyte count 6,000/mm3Platelets 250,000/mm3Prothrombin time 15 secondsActivated partial thromboplastin time 45 secondsBleeding time 12 minutes The patient is given the first-line treatment for her disease. What is this medication's composition and/or mechanism of action?Ask StudybuddyGroup of answer choicesRelease of von Willebrand factor from endothelial cellsRepletion of factors II, V, VII, IX, X, and XIInhibition of carboxylation via g-glutamyl carboxylaseRepletion of factor VIII and von Willebrand factor

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Solution

The patient's symptoms and family history suggest a diagnosis of von Willebrand disease, a genetic disorder that leads to a deficiency or dysfunction of von Willebrand factor, a blood protein that is necessary for proper clotting.

The first-line treatment for von Willebrand disease is desmopressin (DDAVP), a synthetic analog of the antidiuretic hormone vasopressin. The mechanism of action of desmopressin in this context is the release of von Willebrand factor from endothelial cells.

So, the answer to your question is "Release of von Willebrand factor from endothelial cells".

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