- Which of the following is the most appropriate management strategy to offer this patient?
Answer: Initiate prophylactic therapy with topiramate
Prophylactic therapy is indicated for patients with frequent (≥4 per month) or debilitating migraines, or for those whose acute treatments are ineffective or contraindicated. This patient's headache frequency and impact on her life meet the criteria for initiating prophylaxis. Topiramate is a first-line, FDA-approved medication for migraine prevention. Increasing the use of abortive medications like triptans can lead to medication overuse headache. Butalbital-containing compounds have a high risk of dependence and medication overuse headache and are generally avoided. An EEG is not indicated in the evaluation of typical migraines.
- A 30-year-old woman, 2 weeks postpartum after an uncomplicated vaginal delivery, develops a sudden severe occipital headache followed by recurrent thunderclap headaches triggered by exertion. Blood pressure is 146/88 mm Hg. Neurologic examination is normal. Non-contrast CT of the head is unremarkable. CT angiography reveals segmental narrowing and dilatations of multiple cerebral arteries. Which of the following is the most appropriate initial medical therapy?
Answer: Oral nimodipine to relieve reversible cerebral vasoconstriction
When you encounter thunderclap headaches in the postpartum period with characteristic arterial narrowing on imaging, think reversible cerebral vasoconstriction syndrome (RCVS). This condition has a strong association with pregnancy and the postpartum period, likely due to hormonal fluctuations and hemodynamic changes.
The key diagnostic features here are the sudden severe occipital headache followed by recurrent thunderclap headaches triggered by exertion, combined with the pathognomonic CT angiography finding of segmental narrowing and dilatations ("string of beads" appearance) of multiple cerebral arteries. This imaging pattern is virtually diagnostic of RCVS.
A is correct because nimodipine, a calcium channel blocker, is the first-line treatment for RCVS. It helps relieve cerebral vasoconstriction and can prevent complications like stroke. The "reversible" nature of this condition means prompt treatment can lead to complete resolution.
B is incorrect because this isn't vasculitis. While both conditions can cause arterial narrowing, RCVS has a characteristic reversible pattern and doesn't show inflammatory changes. High-dose steroids aren't indicated and may actually worsen outcomes in RCVS.
C is wrong because sumatriptan is contraindicated in RCVS. As a vasoconstrictor, it can worsen cerebral vasoconstriction and potentially trigger stroke in these patients.
D is incorrect because the imaging shows arterial narrowing, not venous thrombosis. Cerebral venous thrombosis would present differently on imaging and clinically.
Study tip: Remember the postpartum period is high-risk for RCVS. When you see thunderclap headaches plus "string of beads" arterial pattern, think RCVS and choose calcium channel blockers over vasoconstrictors.
- Which of the following interventions is most likely to reduce his risk of a future stroke?
Answer: Performing carotid endarterectomy
For patients with a recent TIA or minor ischemic stroke who have symptomatic, high-grade (70-99%) stenosis of the internal carotid artery, carotid endarterectomy (CEA) has been shown to provide a significant reduction in the risk of subsequent stroke when added to best medical therapy. The benefit is greatest when the procedure is performed within two weeks of the event. Long-term dual antiplatelet therapy is not generally recommended over monotherapy outside of specific situations. Warfarin is for cardioembolic sources (e.g., atrial fibrillation). Surveillance alone is insufficient for this degree of symptomatic stenosis.
- A 32-year-old woman has experienced 6 migraine without aura attacks per month for the past 4 months despite appropriate use of sumatriptan and naproxen. She smokes 1 pack of cigarettes daily and takes a combined estrogen-progestin oral contraceptive pill. She has mild persistent asthma that requires daily inhaled budesonide–formoterol. Blood pressure is 118/74 mm Hg, pulse is 76/min, and examination is unremarkable. She requests preventive therapy. Which of the following is the most appropriate prophylactic medication for this patient?
Answer: Topiramate 25 mg orally twice daily with slow titration as tolerated
When evaluating migraine prophylaxis, you must consider both efficacy and contraindications based on the patient's comorbidities. This patient has frequent migraines (≥4 per month) despite acute treatment, making her a clear candidate for preventive therapy.
Topiramate (A) is an excellent first-line choice here. It's highly effective for migraine prevention and has no contraindications in this patient. The starting dose of 25 mg twice daily with slow titration minimizes side effects like cognitive impairment and weight loss. Topiramate is particularly appealing because it doesn't interact negatively with her asthma, smoking status, or contraceptive use.
Propranolol (B) is contraindicated despite being a first-line migraine preventive. Beta-blockers can trigger bronchospasm in asthmatic patients, even those with mild disease. Her daily inhaled bronchodilator requirement makes this choice dangerous.
Verapamil (C) is primarily used for cluster headaches, not migraine prevention. While calcium channel blockers can help migraines, verapamil isn't considered first-line therapy for migraine prophylaxis. Additionally, the twice-daily dosing suggested here isn't standard.
Daily ergotamine (D) is absolutely contraindicated for chronic use. Regular ergotamine can cause medication overuse headaches and serious vascular complications. Ergots should never be used daily for prevention—they're reserved for acute treatment only.
Key takeaway: Always screen prophylactic migraine medications against patient comorbidities. Beta-blockers are excellent for migraine prevention but dangerous in asthmatics. Topiramate and certain anticonvulsants are often safer alternatives when respiratory conditions are present.
- Which of the following is the most appropriate initial pharmacologic treatment for this condition?
Answer: Carbamazepine
This patient's symptoms are classic for trigeminal neuralgia, a neuropathic pain disorder affecting the trigeminal nerve. It is characterized by paroxysms of severe, lancinating pain in the distribution of one or more branches of the nerve, triggered by innocuous stimuli. The first-line medical treatment for trigeminal neuralgia is the anticonvulsant carbamazepine. Amitriptyline is used for other types of neuropathic pain but is not first-line here. Naproxen and sumatriptan are ineffective for this condition.
- A 45-year-old man with stable coronary artery disease and hyperlipidemia presents with a 2-week cluster of nightly headaches. The pain is excruciating, left retro-orbital, and wakes him within 1–2 hours of falling asleep. Physical examination during an attack reveals ipsilateral lacrimation and nasal congestion. Which of the following is the most appropriate acute therapy for this patient's headache attacks?
Answer: High-flow 100% oxygen by non-rebreather mask for 15 minutes at onset
When you encounter a patient with severe unilateral headaches accompanied by autonomic symptoms like lacrimation and nasal congestion, think cluster headaches. The key clinical features here—excruciating retro-orbital pain occurring in clusters, nocturnal timing, and ipsilateral autonomic symptoms—make this diagnosis clear.
High-flow oxygen (option A) is the gold standard first-line acute treatment for cluster headaches. Administered at 100% concentration via non-rebreather mask for 15 minutes, oxygen provides rapid relief in 70-80% of patients within 15 minutes. It's safe, effective, and has no contraindications, making it ideal even for patients with comorbidities.
Option B (subcutaneous sumatriptan) is actually highly effective for cluster headaches and would normally be appropriate, but this patient has stable coronary artery disease. Triptans cause vasoconstriction and are contraindicated in patients with coronary disease due to risk of coronary artery spasm and myocardial infarction.
Option C (intravenous dihydroergotamine) is also contraindicated in coronary artery disease. Like triptans, ergot alkaloids cause significant vasoconstriction and can precipitate cardiac events in patients with underlying coronary disease.
Option D (intravenous morphine) is inappropriate because opioids are generally ineffective for cluster headaches due to the unique pathophysiology involving the trigeminal-autonomic reflex. Additionally, the rapid onset and brief duration of cluster attacks make opioids impractical.
Remember: For cluster headaches, always consider patient comorbidities when choosing acute therapy. High-flow oxygen is universally safe and should be your first choice, especially when vasoconstrictive agents are contraindicated.
- A 28-year-old woman reports 8–10 daily attacks of severe unilateral periorbital pain lasting about 10 minutes each, accompanied by ipsilateral conjunctival injection and tearing. Indomethacin 50 mg taken once aborted one of her attacks completely. Which of the following is the most appropriate preventive therapy?
Answer: Indomethacin 25–50 mg orally three times daily with gastric protection
When you encounter a patient with short-duration unilateral headaches accompanied by autonomic symptoms like conjunctival injection and tearing, think through the trigeminal autonomic cephalalgias (TACs). The key diagnostic clue here is the dramatic response to indomethacin - this is pathognomonic for paroxysmal hemicrania, not cluster headache.
Paroxysmal hemicrania presents with multiple daily attacks (typically 5-40) of severe unilateral pain lasting 2-30 minutes, accompanied by ipsilateral autonomic features. The absolute responsiveness to indomethacin is so characteristic that it's part of the diagnostic criteria. When indomethacin completely aborts an attack, this confirms the diagnosis.
Choice A is correct because indomethacin 25-50 mg three times daily with gastric protection is the standard preventive treatment for paroxysmal hemicrania. Since this patient already demonstrated complete response to indomethacin, continuing it as prophylaxis is the logical next step.
Choice B (verapamil) is the first-line preventive treatment for cluster headache, but this patient's presentation and indomethacin responsiveness indicate paroxysmal hemicrania, not cluster headache. Choice C (prednisone) can be used for cluster headache but isn't appropriate here and doesn't address the underlying condition. Choice D (lithium) is a second-line cluster headache preventive and irrelevant for paroxysmal hemicrania.
Remember: Complete response to indomethacin = paroxysmal hemicrania. This distinguishes it from cluster headache, which looks similar but doesn't respond to indomethacin and requires different treatments like verapamil or oxygen.
- In addition to starting antiplatelet therapy, which of the following is the most important next diagnostic test?
Answer: Carotid duplex ultrasonography
Transient monocular vision loss (amaurosis fugax) is most commonly a symptom of a transient ischemic attack (TIA) due to atherosclerosis of the ipsilateral internal carotid artery. An embolus from a carotid plaque travels to the retinal artery, causing temporary ischemia. Therefore, the most critical next step is to evaluate for carotid artery disease with a carotid duplex ultrasound. This will identify any significant stenosis that may require surgical or endovascular intervention to prevent a future stroke. An EEG is for seizure evaluation, and a lumbar puncture is not indicated.
- A 58-year-old man is in the middle of a typical 8-week cluster period with two 1-hour attacks daily. High-flow oxygen aborts each attack. He has no cardiac history, and blood pressure is 130/80 mm Hg. Which of the following is the most appropriate medication to prevent further attacks during this cluster bout?
Answer: Verapamil 240 mg daily in divided doses with ECG monitoring
When you encounter cluster headache prevention questions, remember that verapamil is the gold standard first-line prophylactic medication during active cluster periods, but it requires cardiac monitoring due to its effects on the conduction system.
Verapamil works by blocking calcium channels in blood vessels and has proven efficacy in preventing cluster headache attacks during active bouts. The typical starting dose is 240 mg daily in divided doses, but patients often require higher doses (up to 480-960 mg daily). Because verapamil can cause PR interval prolongation and heart block, ECG monitoring is essential before initiation and during dose escalation. This patient has no cardiac contraindications, making option A the most appropriate choice.
Option B (prednisone) can provide rapid relief as a bridge therapy while waiting for verapamil to take effect, but using it alone for an 8-week cluster period would expose the patient to significant steroid side effects. Corticosteroids are typically reserved for short-term use (1-2 weeks) or as adjunctive therapy.
Option C (propranolol) is effective for migraine prophylaxis but has no established efficacy for cluster headaches. This represents a common trap - assuming medications work across all primary headache disorders.
Option D (naproxen) may help with some headache types, but NSAIDs are not effective for cluster headache prevention and won't provide adequate protection during an active cluster period.
Remember: For USMLE Step 2, always associate cluster headache prophylaxis with verapamil plus ECG monitoring, and distinguish this from migraine prophylaxis options like propranolol or topiramate.
- A 41-year-old man with no prior headache history presents with severe head pain provoked by coughing and straining. Neurologic examination reveals ataxia and dysmetria. Funduscopic examination shows no papilledema. Which of the following diagnostic tests is most appropriate to obtain first?
Answer: MRI of the brain with and without gadolinium for structural lesions
When you encounter a patient with new-onset severe headaches triggered by Valsalva maneuvers (coughing, straining) combined with cerebellar signs like ataxia and dysmetria, think structural posterior fossa pathology. The cerebellum controls coordination and balance, so these symptoms point to a lesion in this region.
MRI with and without gadolinium (C) is the gold standard for detecting structural brain lesions, especially in the posterior fossa. It provides superior soft tissue contrast compared to CT and can identify masses, inflammatory lesions, demyelinating diseases, or vascular malformations that could cause these symptoms. The gadolinium enhancement helps characterize lesions and detect blood-brain barrier breakdown.
Non-contrast CT (A) has poor sensitivity for posterior fossa pathology due to bone artifact from the skull base. While it's excellent for acute hemorrhage in most brain regions, it often misses subtle posterior fossa bleeds and would miss non-hemorrhagic lesions entirely. Lumbar puncture (B) is contraindicated when you suspect a mass lesion, as it could cause herniation - you need imaging first to rule out increased intracranial pressure. CT angiography (D) focuses on vascular anatomy and would miss non-vascular causes like tumors or inflammatory lesions.
The absence of papilledema doesn't rule out increased intracranial pressure, as it can be absent in acute presentations or posterior fossa lesions.
Study tip: For headaches with focal neurologic signs, always obtain structural brain imaging before lumbar puncture. Match the neurologic findings to anatomical regions - cerebellar signs = posterior fossa investigation needed.
- Which of the following is the most appropriate initial diagnostic step?
Answer: Obtain a non-contrast CT scan of the head
A sudden-onset, "thunderclap" headache is a neurologic emergency highly concerning for subarachnoid hemorrhage (SAH). The first-line diagnostic test is a non-contrast head CT, which is highly sensitive for detecting acute blood in the subarachnoid space. While controlling her blood pressure is important, diagnosis must be established first. A lumbar puncture is the next step if the CT is negative but clinical suspicion for SAH remains high. MRI is less sensitive for acute hemorrhage than CT.
- A 65-year-old man experiences a 15-minute episode of flashing zig-zag lights in his left visual field followed by complete resolution without headache. He is worried about stroke. Which clinical feature most strongly favors migraine aura over transient ischemic attack?
Answer: Gradual spread of visual symptoms over more than 5 minutes
When you encounter visual symptoms in older patients, distinguishing between migraine aura and transient ischemic attack (TIA) is crucial since the treatments and prognoses differ dramatically. The key lies in understanding the temporal characteristics of each condition.
Migraine aura has a pathognomonic feature: the gradual spread or "march" of symptoms over 5-60 minutes. This occurs because migraine aura results from cortical spreading depression - a wave of neuronal depolarization that slowly propagates across the visual cortex at about 2-3 mm per minute. The classic scintillating scotoma (zig-zag lights) typically starts small and gradually expands across the visual field. This gradual progression over more than 5 minutes strongly favors migraine aura, making choice A correct.
Choice B is incorrect because while migraine typically begins earlier in life, migraine aura can occur at any age, including first onset after 60. Choice C is wrong because negative motor symptoms (weakness, numbness) actually suggest TIA rather than migraine - they indicate vascular compromise rather than the positive visual phenomena typical of migraine aura. Choice D is misleading because migraine aura can occur without subsequent headache ("acephalgic migraine"), especially in older patients, so the absence of headache doesn't rule out migraine.
Remember this key distinction: migraine aura marches gradually (think "slow spread"), while TIA symptoms appear suddenly and simultaneously across the affected territory. The temporal pattern of symptom onset is often your best diagnostic clue in distinguishing these conditions on Step 2.
- Which of the following is the most appropriate prophylactic treatment for this patient's condition?
Answer: Amitriptyline
The patient's symptoms are consistent with frequent episodic tension-type headache. When these headaches are frequent and bothersome enough to warrant prophylaxis, amitriptyline is a first-line pharmacologic option. Behavioral therapies and stress management are also important. Sumatriptan is an abortive therapy for migraine. Verapamil is used for cluster headache prophylaxis. Oxycodone is an opioid and is not appropriate for headache management.
- The patient's symptoms are most likely due to which of the following?
Answer: Orthostatic hypotension
This patient has orthostatic hypotension, defined as a drop in systolic blood pressure of ≥20 mmHg or diastolic blood pressure of ≥10 mmHg within 3 minutes of standing. His blood pressure dropped by 25 mmHg systolic. This is a common cause of syncope and presyncope in the elderly, often exacerbated by medications such as diuretics (hydrochlorothiazide), calcium channel blockers (amlodipine), and alpha-blockers (tamsulosin). BPPV causes vertigo, not syncope. Carotid stenosis and arrhythmias are less likely given the clear postural trigger.
- Which of the following is the most appropriate next step in management?
Answer: Administer subcutaneous sumatriptan
This patient is experiencing an acute, moderate-to-severe migraine attack that has failed to respond to a simple analgesic (ibuprofen). Triptans, such as sumatriptan, are first-line abortive therapy for such attacks. Propranolol is a prophylactic medication and is not used for acute treatment. A CT scan is not indicated as the headache presentation is typical for her known migraine disorder and there are no red flag symptoms. Opioids are generally avoided for migraine management due to the risk of dependence and medication overuse headache.
- What is the most appropriate initial step in her management?
Answer: Advise discontinuation of the over-the-counter analgesic
This patient's presentation is classic for medication overuse headache (MOH). This occurs when a patient with a pre-existing primary headache disorder develops a new type of headache or a marked worsening of their existing one due to the frequent use of acute headache medications. The first and most critical step in management is to discontinue the offending medication. Prophylactic therapies are unlikely to be effective until the overused medication is stopped. Increasing the dose would worsen the problem.
- A 34-year-old woman with migraine with aura requests contraception. She smokes half a pack of cigarettes per day. Blood pressure is 124/76 mm Hg. Which contraceptive option is most appropriate given her headache history?
Answer: Copper intrauterine device providing long-term hormone-free contraception
When evaluating contraceptive options for women with migraine with aura, you must understand the critical relationship between estrogen and stroke risk. Migraine with aura is associated with an increased baseline risk of ischemic stroke, and estrogen-containing contraceptives further elevate this risk through prothrombotic effects. This creates a dangerous combination that contraindications estrogen use in these patients.
The copper intrauterine device (A) is the ideal choice because it provides highly effective, long-term contraception without any hormonal components. It eliminates the estrogen-related stroke risk while offering over 99% contraceptive efficacy for up to 10 years. Her smoking history (additional stroke risk factor) and blood pressure make hormone-free options even more appropriate.
Option B (combined oral contraceptive) contains both estrogen and progestin, directly exposing her to the contraindicated estrogen. Option C (vaginal ring) continuously releases ethinyl estradiol, an estrogen that poses the same stroke risk as oral formulations. Option D (transdermal estrogen patch) actually provides higher and more consistent estrogen levels than oral pills, making it particularly dangerous for this patient.
While progestin-only methods would also be acceptable alternatives, they aren't among the choices presented here.
Key takeaway: Always screen for migraine with aura before prescribing estrogen-containing contraceptives. When you see "migraine with aura" in a contraception question, immediately eliminate all estrogen-containing options and look for progestin-only or non-hormonal alternatives. The copper IUD is often the best choice when listed.
- A 50-year-old woman develops a sudden, severe "worst headache of her life" while lifting groceries. In the emergency department, non-contrast head CT performed 2 hours after onset is normal. Neurologic examination shows mild nuchal rigidity but no focal deficits. Vital signs are stable. Which of the following is the most appropriate next step in evaluation?
Answer: Lumbar puncture to evaluate for xanthochromia and elevated opening pressure
When you encounter a patient with sudden-onset "worst headache of life," you're dealing with a classic presentation that should immediately raise concern for subarachnoid hemorrhage (SAH). This is a neurological emergency where rapid, systematic evaluation can be life-saving.
The correct next step is A) Lumbar puncture to evaluate for xanthochromia and elevated opening pressure. Here's why: Non-contrast CT has excellent sensitivity for SAH within the first 6 hours, but its sensitivity drops significantly after 12-24 hours as blood breaks down. Since this patient's CT was normal at 2 hours but the clinical presentation strongly suggests SAH (thunderclap headache with exertion, nuchal rigidity), you must rule out SAH definitively. Lumbar puncture can detect xanthochromia (yellow discoloration from hemoglobin breakdown) and elevated opening pressure, which indicate bleeding even when CT appears normal.
B) MRA without further delay would be premature - you need to confirm bleeding exists before looking for its source. C) Repeat CT in 24 hours is dangerous because it delays diagnosis and could miss the therapeutic window if an aneurysm needs urgent intervention. D) Discharge home is inappropriate given the high-risk presentation and normal initial CT - this combination demands further investigation.
Key strategy: Remember that SAH evaluation follows a stepwise approach: CT first (high yield early), then LP if CT negative but clinical suspicion remains high, then vascular imaging once bleeding is confirmed. Never discharge a thunderclap headache patient based solely on normal CT.
- A 39-year-old man with episodic migraine uses sumatriptan 100 mg tablets. He presents with chest tightness and throat pressure 30 minutes after taking a dose, but vital signs and ECG are normal. Which pharmacologic mechanism most likely explains his symptoms?
Answer: Coronary vasoconstriction mediated by 5-HT₁B receptor activation
When you encounter adverse effects from migraine medications, focus on the drug's primary mechanism of action and how it might affect other body systems with similar receptors.
Sumatriptan is a selective 5-HT₁B/1D receptor agonist that treats migraines by causing vasoconstriction of dilated cranial blood vessels. However, 5-HT₁B receptors are also found in coronary arteries. When sumatriptan activates these receptors, it can cause coronary vasoconstriction, leading to chest tightness and throat pressure - classic symptoms of coronary vessel narrowing. This effect can occur even with normal vital signs and ECG, especially in patients without underlying coronary disease where the vasoconstriction doesn't cause ischemic changes detectable on initial testing.
Option B is incorrect because sumatriptan doesn't have β-adrenergic blocking properties - it's a serotonin receptor agonist, not a beta-blocker. Option C describes an allergic-type reaction involving histamine and bronchospasm, but sumatriptan's adverse effects are primarily vascular, not allergic or respiratory. The chest symptoms aren't due to airway constriction but vascular effects. Option D mentions endothelin-1 and pulmonary vascular effects, but sumatriptan's mechanism involves serotonin receptors, not endothelin pathways.
Remember that triptans are contraindicated in patients with coronary artery disease precisely because of this 5-HT₁B-mediated coronary vasoconstriction. When you see triptan side effects on the USMLE, think "same mechanism, different location" - the drug works the same way throughout the vascular system.
- A 67-year-old woman presents with a 2-week history of new, throbbing right temporal headaches and jaw discomfort when chewing. Vision is intact. Temperature is 37.4 °C (99.3 °F). Physical examination reveals scalp tenderness over the right temporal area. ESR is pending. Which of the following is the most appropriate next step?
Answer: Begin high-dose oral prednisone immediately and arrange temporal artery biopsy
When you encounter a patient with new-onset temporal headaches, jaw claudication, and scalp tenderness in someone over 50, think giant cell arteritis (GCA) immediately. This is a medical emergency because vision loss can occur suddenly and irreversibly if untreated.
The correct answer is A because GCA requires urgent treatment based on clinical suspicion alone. The classic triad of temporal headache, jaw claudication, and scalp tenderness in an elderly patient is highly suggestive of GCA. High-dose corticosteroids (typically prednisone 60-80mg daily) must be started immediately to prevent the most feared complication: permanent vision loss from anterior ischemic optic neuropathy. The temporal artery biopsy should be arranged within 1-2 weeks of starting steroids, as histologic changes remain detectable for this period.
Choice B is dangerous because waiting for ESR results delays critical treatment. While ESR is typically elevated in GCA, normal values don't rule it out, and vision loss can occur within hours.
Choice C delays treatment unnecessarily. MRI may support the diagnosis but shouldn't postpone urgent corticosteroid therapy when clinical suspicion is high.
Choice D vastly underestimates the severity of this condition. Low-dose aspirin alone is inadequate for preventing the inflammatory vascular damage in GCA.
Remember this key USMLE Step 2 principle: when GCA is suspected clinically, start high-dose steroids immediately—don't wait for confirmatory tests. The risk of permanent vision loss far outweighs any potential steroid side effects from brief treatment.
