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A 3-year-old girl is admitted to the hospital with a 2-day history of constipation, lethargy, and a weak cry. Repetitive stimulation performed at 20 Hz revealed incremental response. What is the likely cause of this patient’s illness?
Which of the following is the mechanism of action for selegiline?
Which of the following is not a risk factor for suicide?
A 47-year-old female presents to the clinic with the chief complaint of slowly progressive proximal muscle weakness. Electromyography showed short duration, low amplitude motor unit action potentials. A muscle biopsy was performed and shown below. A diagnosis is made and the patient is started on a therapeutic agent. What is the most likely medication initiated?
Which of the following features on EMG is suggestive of chronic denervation?
A 64-year-old female with no significant past medical history presents to the clinic because of concerns related to her memory. She states that she has difficulty recalling names and recent conversations. She had a planned retirement two years ago and was functioning well at work at that time. She continues to live alone and is independent with her basic and instrumental daily life activities. Depression screening is negative, but she scores a 27/30 on the Montreal Cognitive Assessment (MOCA), with deficits in delayed recall. Her neurological examination is otherwise non-focal. What is the most likely diagnosis?
A 4-year-old male with no significant past medical history presents to the emergency room after experiencing a first-time seizure. An EEG is obtained and captures a seizure arising from the left hemisphere and polymorphic delta slowing on the same side. Over the next several months the child continues to experience focal-onset seizures despite being on 2 maximally-dosed seizure medications. His brain MRI, below, shows asymmetric left-hemispheric atrophy. His clinic presentation and imaging are most consistent with which of the following diseases?
A 34-year-old schoolteacher presents to the emergency department with confusion and weakness. Her family reports they have been staying at their cabin for labor day weekend and the patient spent the whole time inside complaining of generalized fatigue, myalgia, headache, and light sensitivity. They felt she had “a cold” so they let her rest. This morning, Monday, she was found in her bed unable to move and confused.
On exam, she is disoriented. She has nuchal rigidity. On musculoskeletal exam, she has diffuse but left > right weakness in the limbs. Her reflexes are 0/4 in the bilateral ankle, knee, and brachioradialis, and 1+ in the bilateral biceps. The sensory exam is normal.
The serum glucose is 100. Lumbar puncture is performed and shows glucose 60, protein 55, RBC 1, and WBC 25, lymphocyte-predominant.
Which of the following is the most appropriate preventive measure for this condition?
A 20-year-old female presents to the clinic with weakness and numbness in the right leg. She states that earlier in the day she was taking a long nap on her right side, and when she awoke, her entire leg felt like pins and needles. When she got up, she felt that she was dragging her right leg on the floor. She has had similar experiences in other limbs over the years but symptoms would slowly improve over weeks. Nerve conduction studies showed a right common peroneal nerve conduction block and mildly decreased conduction velocities of all nerves tested. Her mother reports that her father had similar episodes before he passed away from an unrelated illness. Which of the following is the most likely diagnosis?
A two-week-old female is evaluated in the clinic. Upon physical exam, you notice a dimple and overlying tuft of hair on her lower back. This finding is most likely associated with a defect that occurs during which week of gestation?
A 40-year-old male presents to the clinic with difficulty swallowing. On additional questioning, he reports difficulty walking, falls, and dysarthria. Examination shows bilateral facial weakness, fasciculations, and gynecomastia. A CAG trinucleotide repeat on which of the following genes is the cause of this disease?
A 52-year-old woman is brought to the emergency room in respiratory distress. She is accompanied by her husband who stated that they were eating at a high-end sushi restaurant when his wife started to complain of perioral numbness and tingling. Two hours later she started to complain of generalized weakness and trouble breathing. Accidental poisoning is suspected. Based on the available information, what is the mechanism of action of the poison ingested?
A 65-year-old right-handed man presents with acute onset speech difficulties, a mild right-sided facial droop, and right-sided arm weakness. While talking to his wife over breakfast this morning he suddenly stopped speaking and could only make unintelligible sounds. On examination, he is unable to speak any words but has intact comprehension. He is able to write clearly what he wants in full sentences with intact grammar and reading is also preserved. Which of the following best describes his language deficit?
Which of the following medications is associated with the occurrence of reversible cerebral vasoconstriction syndrome (RCVS)?
The thalamus and hypothalamus are derived from what embryonic structures?