Struvite stones, form only when the upper urinary tract is infected with urease-producing bacteria such as Proteus mirabilis, Klebsiella pneumoniae, Staphylococcus,
saprophyticus.
three possible correct answers?
Struvite stones, form only when the upper urinary tract is infected with urease-producing bacteria such as Proteus mirabilis, Klebsiella pneumoniae, Staphylococcus,
You certainly can calcĂșlate the positive predictive value, you have 85% of the deseased that tested positive, so they are true positives, you also have 15% that tested positive but have no symptoms so they are false positive, since PPV= TP/TP+FP x 100, then you have all the information you need in order to obra in the positive predictive value, so i think tour answer might be wrong..
I think answer is wrong
You certainly can calcĂșlate the positive predictive value, you have 85% of the deseased that tested positive, so they are true positives, you also have 15% that tested positive but have no symptoms so they are false positive, since PPV= TP/TP+FP x 100, then you have all the information you need in order to obra in the positive predictive value, so i think tour answer might be wrong..
A 58-year-old man presents with history of recurrent rashes that became severe in the last week. The rashes were erythematous with a fine, sandpaper-like texture. He also reports having a fever and symptoms of a sore throat two weeks prior to the rash. Examination reveals a 'strawberry tongue'. Based on the history and physical examination, what mechanism is the most likely cause of this patient's symptoms?
correct answer: type 4 hypersensitivity
I picked the answer "direct toxins from bacterial exotoxins"
why is this type 4 hypersensitivity? please explain
scarlet fever
A 58-year-old man presents with history of recurrent rashes that became severe in the last week. The rashes were erythematous with a fine, sandpaper-like texture. He also reports having a fever and symptoms of a sore throat two weeks prior to the rash. Examination reveals a 'strawberry tongue'. Based on the history and physical examination, what mechanism is the most likely cause of this patient's symptoms?
correct answer: type 4 hypersensitivity
I picked the answer "direct toxins from bacterial exotoxins"
why is this type 4 hypersensitivity? please explain
The patient in this case is 70 years old. At this age, an corneal arcus is fairly common. Given the circumstances, FH would not be my first thought. If the patient was young (<50), hyperlipidemia/FH would be a more likely differential diagnosis.
Arcus senilis
The patient in this case is 70 years old. At this age, an corneal arcus is fairly common. Given the circumstances, FH would not be my first thought. If the patient was young (<50), hyperlipidemia/FH would be a more likely differential diagnosis.
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Question Discussion for step 1
Hey guys! I'm starting a group exclusively for doubt clearance and discussion of UWorld questions ( or any other question bank). We can help each other out by explaining topics to our peers in a mutually beneficial way. Please join using this link: https://chat.whatsapp.com/HQcMoouB4jHDcAjdTl8m2E
In the question says "Blood cultures grew gram-positive cocci in clusters" which made me think of Staph but the medical history madde me think of Strep. Now, I donŽt know if it was a coinfection or what happened there
Streptococcus can be in clusters?
In the question says "Blood cultures grew gram-positive cocci in clusters" which made me think of Staph but the medical history madde me think of Strep. Now, I donŽt know if it was a coinfection or what happened there
the explanation should include how colon plays an important role in contributing to the hyperkalemia. constipation meaning the "poop feels stuck" so additional absorption wouldn't take place
how is the colon responsible for hyperkalemia
the explanation should include how colon plays an important role in contributing to the hyperkalemia. constipation meaning the "poop feels stuck" so additional absorption wouldn't take place
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Mustafa Mohammed Tabeer Suliman has liked this
Welcome & introductions
Welcome to the USMLE Step 1 Community. Why not take some time to introduce yourself, let us know what you do, where you come from and what your healthcare interests are.
