TIA management and ABCD2 score — MCQs

10 questions

A 71-year-old woman presents with a transient episode of right arm and hand weakness that resolved in approximately one hour. Her symptoms started while she was gardening. Her past medical history is notable for hypertension, diabetes, anxiety, and dyslipidemia. Her current medications include insulin, metformin, and fluoxetine. Examination reveals a left carotid bruit. Ultrasound duplex of her carotid arteries demonstrates right and left carotid stenosis of 35% and 50%, respectively. Which of the following is the best next step in management?

A 61-year-old man is brought to the emergency room with slurred speech. According to the patient's wife, they were watching a movie together when he developed a minor headache. He soon developed difficulty speaking in complete sentences, at which point she decided to take him to the emergency room. His past medical history is notable for hypertension and hyperlipidemia. He takes aspirin, lisinopril, rosuvastatin. The patient is a retired lawyer. He has a 25-pack-year smoking history and drinks 4-5 beers per day. His father died of a myocardial infarction, and his mother died of breast cancer. His temperature is 98.6°F (37°C), blood pressure is 143/81 mmHg, pulse is 88/min, and respirations are 21/min. On exam, he can understand everything that is being said to him and is able to repeat statements without difficulty. However, when asked to speak freely, he hesitates with every word and takes 30 seconds to finish a short sentence. This patient most likely has an infarct in which of the following vascular distributions?

A 77-year-old woman is brought by ambulance to the emergency department after she developed weakness of her right arm along with a right-sided facial droop. By the time the ambulance arrived, she was having difficulty speaking. Past medical history is significant for hypertension, diabetes mellitus type II, and hyperlipidemia. She takes lisinopril, hydrochlorothiazide, metformin, and atorvastatin. On arrival to the emergency department, her vital signs are within normal limits. On physical examination, she is awake and alert but the right side of her mouth is dropping, making it difficult for her to speak clearly. Her heart has a regular rate and rhythm and her lungs are clear to auscultation bilaterally. Fingerstick glucose is 85 mg/dL. Her right upper extremity strength is 2/5 and her left upper extremity strength is 5/5. Which of the following is the best next step in management?

A 73-year-old man noted a rapid onset of severe dizziness and difficulty swallowing while watching TV at home. His wife reports that he had difficulty forming sentences and his gait was unsteady at this time. Symptoms were severe within 1 minute and began to improve spontaneously after 10 minutes. He has had type 2 diabetes mellitus for 25 years and has a 50 pack-year smoking history. On arrival to the emergency department 35 minutes after the initial development of symptoms, his manifestations have largely resolved with the exception of a subtle nystagmus and ataxia. His blood pressure is 132/86 mm Hg, the heart rate is 84/min, and the respiratory rate is 15/min. After 45 minutes, his symptoms are completely resolved, and neurological examination is unremarkable. Which of the following is the most likely cause of this patient’s condition?

A 62-year-old man is brought to the emergency department because of right-sided weakness and subjective decreased sensation that started 30 minutes ago. The patient reports that his symptoms started to ease 5 minutes after onset and have now completely resolved. He has hypertension, hyperlipidemia, and type 2 diabetes mellitus. He has smoked one pack of cigarettes daily for 40 years. His current medications include lisinopril, metformin, and sitagliptin. He is 183 cm (6 ft 0 in) tall and weighs 105 kg (220 lb); BMI is 32 kg/m2. He appears well. His temperature is 36.5°C (97.7°F), pulse is 80/min, and blood pressure is 150/88 mm Hg. Neurological examination shows no abnormalities. Cardiac examination shows regular rate and rhythm and a left-sided carotid bruit. Complete blood count, serum glucose, and electrolytes are within the reference ranges. An ECG shows sinus rhythm and left axis deviation. A CT scan of the head without contrast shows no abnormalities. Carotid doppler ultrasound shows 45% stenosis in the left carotid artery and 15% stenosis in the right. Which of the following is the most appropriate next step in management?

A 48-year-old woman presents with acute stroke symptoms 18 hours ago. MRI shows a right MCA M1 occlusion with large penumbra on perfusion imaging (mismatch ratio >1.8) and small infarct core (25 mL). Her NIHSS is 16. She has no significant comorbidities. Her family is concerned about disability but wants to pursue treatment if reasonable chance of benefit exists. Synthesize the evidence and evaluate the treatment approach.

A 55-year-old man undergoes successful thrombectomy for left MCA occlusion. Post-procedure, he develops progressive lethargy and his blood pressure increases to 180/100 mmHg. CT shows hyperdensity in the treated territory without hemorrhage, and his symptoms worsen over 4 hours despite blood pressure control. Evaluate the most likely diagnosis and management priority.

An 80-year-old woman with atrial fibrillation presents 2 hours after acute ischemic stroke. NIHSS is 22. Imaging shows large left MCA territory infarction involving >1/3 of MCA territory with basilar artery occlusion. She lives alone but was independent before this event. Her family requests all possible interventions. Evaluate the management approach considering benefits versus risks.

A 58-year-old woman with history of TIA 3 weeks ago presents with acute ischemic stroke. Imaging reveals new right MCA infarction and severe (70-99%) symptomatic right carotid stenosis. She received alteplase 6 hours ago with partial improvement. Her NIHSS improved from 14 to 8. Analyze the optimal timing for carotid revascularization.

Q10

A 62-year-old man received IV alteplase 45 minutes ago for acute ischemic stroke. He now develops sudden severe headache, vomiting, and decreased level of consciousness. His blood pressure is 190/110 mmHg. Analyze the most critical immediate steps in management.

TIA management and ABCD2 score US Medical PG Practice Questions and MCQs

Question 1: A 71-year-old woman presents with a transient episode of right arm and hand weakness that resolved in approximately one hour. Her symptoms started while she was gardening. Her past medical history is notable for hypertension, diabetes, anxiety, and dyslipidemia. Her current medications include insulin, metformin, and fluoxetine. Examination reveals a left carotid bruit. Ultrasound duplex of her carotid arteries demonstrates right and left carotid stenosis of 35% and 50%, respectively. Which of the following is the best next step in management?

A. Bilateral carotid endarterectomy
B. Left carotid endarterectomy only
C. Aspirin (Correct Answer)
D. Observation
E. Warfarin

Explanation: ***Aspirin*** - This patient suffered a **transient ischemic attack (TIA)** given her transient focal neurological deficit. Given that her carotid stenosis is **moderate (35% and 50%)**, **antiplatelet therapy** with aspirin is the initial and best next step to prevent future strokes. - Aspirin helps prevent platelet aggregation, reducing the risk of **thrombus formation** in already stenotic vessels. *Bilateral carotid endarterectomy* - This is not the best next step, as **carotid endarterectomy** is generally reserved for symptomatic patients with **high-grade stenosis** (e.g., typically >70%). - Performing bilateral procedures at once carries higher risks than staged procedures or medical management for moderate stenosis. *Left carotid endarterectomy only* - This is not indicated. While symptoms occurred on the right side (implying a left-sided lesion), a **left carotid endarterectomy** is primarily considered for **high-grade stenosis** in symptomatic patients. - Her left carotid stenosis is 50%, which is considered moderate and not an immediate indication for surgery. *Observation* - This is inappropriate as the patient has experienced a **TIA**, indicating a high risk of future stroke. - Without intervention, including antiplatelet therapy, the risk of a debilitating stroke is significantly increased. *Warfarin* - **Warfarin** is an anticoagulant used for conditions like atrial fibrillation or deep vein thrombosis but is **not the primary treatment for TIA due to carotid stenosis**. - Its use in this context may increase the risk of bleeding without providing superior benefit to aspirin in preventing arterial clots from carotid plaques.

Question 2: A 61-year-old man is brought to the emergency room with slurred speech. According to the patient's wife, they were watching a movie together when he developed a minor headache. He soon developed difficulty speaking in complete sentences, at which point she decided to take him to the emergency room. His past medical history is notable for hypertension and hyperlipidemia. He takes aspirin, lisinopril, rosuvastatin. The patient is a retired lawyer. He has a 25-pack-year smoking history and drinks 4-5 beers per day. His father died of a myocardial infarction, and his mother died of breast cancer. His temperature is 98.6°F (37°C), blood pressure is 143/81 mmHg, pulse is 88/min, and respirations are 21/min. On exam, he can understand everything that is being said to him and is able to repeat statements without difficulty. However, when asked to speak freely, he hesitates with every word and takes 30 seconds to finish a short sentence. This patient most likely has an infarct in which of the following vascular distributions?

A. Proximal middle cerebral artery
B. Inferior division of the middle cerebral artery
C. Middle cerebral artery and posterior cerebral artery watershed area
D. Superior division of the middle cerebral artery (Correct Answer)
E. Anterior cerebral artery and middle cerebral artery watershed area

Explanation: ***Superior division of the middle cerebral artery*** - The patient's inability to speak spontaneously coupled with intact comprehension and repetition is characteristic of **Broca's aphasia**, which results from damage to **Broca's area** in the dominant frontal lobe. - Broca's area is supplied by the **superior division of the middle cerebral artery (MCA)**. *Proximal middle cerebral artery* - An infarct in the proximal MCA, or the main stem, would typically lead to global aphasia if the dominant hemisphere is affected, characterized by **severe deficits in comprehension, repetition, and speech production**. - This presentation does not align with the patient's ability to understand and repeat statements. *Inferior division of the middle cerebral artery* - The inferior division of the MCA supplies Wernicke's area in the dominant hemisphere. - Damage here causes **Wernicke's aphasia**, characterized by **fluent but nonsensical speech** with **impaired comprehension** and **repetition**, which is contrary to the patient's symptoms. *Middle cerebral artery and posterior cerebral artery watershed area* - Watershed infarcts, especially between the MCA and posterior cerebral artery (PCA), can cause **transcortical sensory aphasia** if in the dominant hemisphere. - This type of aphasia involves impaired comprehension but **intact repetition**, which differs from Broca's aphasia where spontaneous speech is the main deficit. *Anterior cerebral artery and middle cerebral artery watershed area* - Infarcts in the watershed area between the anterior cerebral artery (ACA) and MCA can result in **transcortical motor aphasia** if in the dominant hemisphere. - This condition presents with **non-fluent speech** and **intact repetition**, similar to Broca's aphasia, but Broca's area itself is located specifically within the MCA superior division territory.

Question 3: A 77-year-old woman is brought by ambulance to the emergency department after she developed weakness of her right arm along with a right-sided facial droop. By the time the ambulance arrived, she was having difficulty speaking. Past medical history is significant for hypertension, diabetes mellitus type II, and hyperlipidemia. She takes lisinopril, hydrochlorothiazide, metformin, and atorvastatin. On arrival to the emergency department, her vital signs are within normal limits. On physical examination, she is awake and alert but the right side of her mouth is dropping, making it difficult for her to speak clearly. Her heart has a regular rate and rhythm and her lungs are clear to auscultation bilaterally. Fingerstick glucose is 85 mg/dL. Her right upper extremity strength is 2/5 and her left upper extremity strength is 5/5. Which of the following is the best next step in management?

A. Obtain transcranial doppler
B. Start tissue plasminogen activator (tPA)
C. Consult cardiology
D. Intubate the patient
E. Obtain noncontrast CT of the brain (Correct Answer)

Explanation: ***Obtain noncontrast CT of the brain*** - An **urgent noncontrast CT of the brain** is the **most crucial initial step** in managing acute neurological deficits suggestive of stroke. - This imaging is essential to **rule out hemorrhagic stroke** before considering thrombolytic therapy like tPA. *Obtain transcranial doppler* - **Transcranial Doppler (TCD)** can be used to assess cerebral blood flow and identify vascular stenosis but is not the immediate first-line diagnostic imaging for an acute stroke presentation. - TCD is typically performed **after initial imaging** to determine the presence of large vessel occlusion or monitor for vasospasm, not to differentiate between ischemic and hemorrhagic stroke. *Start tissue plasminogen activator (tPA)* - While **tPA** is a treatment for acute ischemic stroke, it is **contraindicated in hemorrhagic stroke**. - Without a **noncontrast CT scan to rule out hemorrhage**, administering tPA can be life-threatening. *Consult cardiology* - Consulting cardiology is important for evaluating potential cardiac sources of emboli (e.g., atrial fibrillation) as a cause of stroke but it is **not the immediate next step** in managing acute stroke symptoms. - The **immediate priority is diagnosing the type of stroke** and determining eligibility for acute interventions. *Intubate the patient* - **Intubation** is reserved for patients with compromise of their **airway, breathing, or circulation (ABCs)**, or a significantly decreased level of consciousness (e.g., GCS < 8). - This patient is described as **awake and alert**, making intubation unnecessary at this stage.

Question 4: A 73-year-old man noted a rapid onset of severe dizziness and difficulty swallowing while watching TV at home. His wife reports that he had difficulty forming sentences and his gait was unsteady at this time. Symptoms were severe within 1 minute and began to improve spontaneously after 10 minutes. He has had type 2 diabetes mellitus for 25 years and has a 50 pack-year smoking history. On arrival to the emergency department 35 minutes after the initial development of symptoms, his manifestations have largely resolved with the exception of a subtle nystagmus and ataxia. His blood pressure is 132/86 mm Hg, the heart rate is 84/min, and the respiratory rate is 15/min. After 45 minutes, his symptoms are completely resolved, and neurological examination is unremarkable. Which of the following is the most likely cause of this patient’s condition?

A. Anterior cerebral artery occlusion
B. Middle cerebral artery occlusion
C. Posterior cerebral artery occlusion
D. Lenticulostriate artery occlusion
E. Vertebral artery occlusion (Correct Answer)

Explanation: ***Vertebral artery occlusion*** - The patient's symptoms of **severe dizziness**, **difficulty swallowing**, **dysarthria**, **unsteady gait**, **nystagmus**, and **ataxia** are classic manifestations of **posterior circulation ischemia**, which is supplied by the vertebral and basilar arteries. - The rapid onset, transient nature, and complete resolution of symptoms suggest a **transient ischemic attack (TIA)** affecting the posterior cerebral circulation, often due to **vertebral artery stenosis** or a **vertebral artery embolus**. *Anterior cerebral artery occlusion* - Occlusion of the anterior cerebral artery typically causes **contralateral leg weakness**, sensory loss, and behavioral changes, which are not seen in this patient. - Symptoms like dizziness and dysphagia are **not characteristic** of anterior cerebral artery involvement. *Middle cerebral artery occlusion* - Middle cerebral artery occlusion commonly presents with **contralateral arm and facial weakness**, aphasia (if the dominant hemisphere is affected), and visual field defects. - The patient's symptoms are localized to the **brainstem/cerebellum**, not the MCA territory. *Posterior cerebral artery occlusion* - While the posterior cerebral artery is part of the posterior circulation, its occlusion primarily causes **contralateral homonymous hemianopia** and, if severe, memory deficits or alexia. - It typically **does not cause severe dizziness**, dysphagia, or gait ataxia as prominent initial symptoms. *Lenticulostriate artery occlusion* - Lenticulostriate arteries supply deep structures like the **basal ganglia** and **internal capsule**. Occlusion typically leads to **pure motor** or **pure sensory lacunar strokes**. - This patient's constellation of symptoms (dizziness, dysphagia, ataxia) is **too widespread for a typical lacunar infarct** in the lenticulostriate territory.

Question 5: A 62-year-old man is brought to the emergency department because of right-sided weakness and subjective decreased sensation that started 30 minutes ago. The patient reports that his symptoms started to ease 5 minutes after onset and have now completely resolved. He has hypertension, hyperlipidemia, and type 2 diabetes mellitus. He has smoked one pack of cigarettes daily for 40 years. His current medications include lisinopril, metformin, and sitagliptin. He is 183 cm (6 ft 0 in) tall and weighs 105 kg (220 lb); BMI is 32 kg/m2. He appears well. His temperature is 36.5°C (97.7°F), pulse is 80/min, and blood pressure is 150/88 mm Hg. Neurological examination shows no abnormalities. Cardiac examination shows regular rate and rhythm and a left-sided carotid bruit. Complete blood count, serum glucose, and electrolytes are within the reference ranges. An ECG shows sinus rhythm and left axis deviation. A CT scan of the head without contrast shows no abnormalities. Carotid doppler ultrasound shows 45% stenosis in the left carotid artery and 15% stenosis in the right. Which of the following is the most appropriate next step in management?

A. Antiplatelet therapy (Correct Answer)
B. Carotid endarterectomy
C. Transthoracic echocardiogram
D. Carotid artery stenting
E. Intravenous alteplase therapy

Explanation: **Antiplatelet therapy** - This patient experienced a **transient ischemic attack (TIA)** due to the sudden onset and complete resolution of symptoms. Antiplatelet therapy with **aspirin** or **clopidogrel** is crucial for secondary prevention of stroke in patients with TIA, especially given his multiple vascular risk factors and carotid bruit. - The combination of **hypertension, hyperlipidemia, type 2 diabetes, smoking history, and obesity** significantly increases his risk of recurrent cerebrovascular events, making antiplatelet therapy an immediate and appropriate intervention. *Carotid endarterectomy* - **Carotid endarterectomy** is typically indicated for symptomatic carotid stenosis of **70% or greater** in patients with a TIA or non-disabling stroke, or for asymptomatic stenosis of 60% or greater in selected patients. - This patient's carotid doppler ultrasound showed only **45% stenosis** in the left carotid artery, which is below the threshold for surgical intervention. *Transthoracic echocardiogram* - A **transthoracic echocardiogram (TTE)** may be considered to evaluate for a cardiac source of emboli (e.g., atrial fibrillation, patent foramen ovale, left ventricular thrombus) if the cause of TIA is unclear after initial workup. - Given the presence of a **carotid bruit** and known vascular risk factors, carotid artery disease is the more likely etiology, and antiplatelet therapy is a more urgent initial step. *Carotid artery stenting* - **Carotid artery stenting** is generally reserved for patients with symptomatic carotid stenosis who are at high surgical risk for endarterectomy or have anatomical features that make endarterectomy difficult. - Similar to endarterectomy, the **45% stenosis** in this patient's carotid artery is not severe enough to warrant stenting at this time. *Intravenous alteplase therapy* - **Intravenous alteplase** is indicated for acute ischemic stroke within a specific time window (typically 3-4.5 hours from symptom onset) when there is persistent neurological deficit. - This patient's symptoms have **completely resolved**, indicating a TIA, not an acute ischemic stroke, thus making alteplase therapy inappropriate and potentially harmful.

Question 6: A 48-year-old woman presents with acute stroke symptoms 18 hours ago. MRI shows a right MCA M1 occlusion with large penumbra on perfusion imaging (mismatch ratio >1.8) and small infarct core (25 mL). Her NIHSS is 16. She has no significant comorbidities. Her family is concerned about disability but wants to pursue treatment if reasonable chance of benefit exists. Synthesize the evidence and evaluate the treatment approach.

A. Intravenous alteplase as salvageable tissue is present
B. Intra-arterial thrombolysis combined with mechanical device
C. No intervention as she is outside the standard treatment window
D. Mechanical thrombectomy based on perfusion imaging criteria (Correct Answer)
E. Medical management with antiplatelet and early rehabilitation

Explanation: ***Mechanical thrombectomy based on perfusion imaging criteria*** - For patients with large vessel occlusion (LVO) in the extended 6–24 hour window, **DAWN** and **DEFUSE-3** trials demonstrated significant functional benefit when clinical-core mismatch is present. - This patient satisfies criteria with an **M1 occlusion**, a **small infarct core (<70 mL)**, and a **large mismatch ratio (>1.8)**, indicating substantial salvageable penumbra. *Intravenous alteplase as salvageable tissue is present* - The therapeutic window for **IV alteplase** is strictly limited to within **4.5 hours** of symptom onset; it is not recommended at 18 hours due to high hemorrhage risk. - While salvageable tissue exists, chemical thrombolysis is less effective than mechanical intervention for **proximal M1 occlusions** and is unsafe in this late window. *Intra-arterial thrombolysis combined with mechanical device* - **Intra-arterial thrombolysis** is generally superseded by modern **stent retrievers** and aspiration catheters which provide faster and more complete recanalization. - Current guidelines prioritize standalone **mechanical thrombectomy** in the late window to minimize procedural risks and intracranial hemorrhage. *No intervention as she is outside the standard treatment window* - The "Time is Brain" concept has evolved into "Tissue is Brain," where **perfusion imaging** identifies candidates who benefit regardless of the traditional 6-hour clock. - Denying treatment based solely on the 18-hour timeframe ignores high-level evidence from the **DAWN** trial showing benefit up to 24 hours. *Medical management with antiplatelet and early rehabilitation* - Standard **medical management** (aspirin/heparin) for an M1 occlusion with a high **NIHSS score (16)** usually results in poor functional outcomes and severe disability. - While rehabilitation is essential, it does not address the underlying **large vessel occlusion** which can be reversed with mechanical intervention to prevent infarct expansion.

Question 7: A 55-year-old man undergoes successful thrombectomy for left MCA occlusion. Post-procedure, he develops progressive lethargy and his blood pressure increases to 180/100 mmHg. CT shows hyperdensity in the treated territory without hemorrhage, and his symptoms worsen over 4 hours despite blood pressure control. Evaluate the most likely diagnosis and management priority.

A. Hemorrhagic transformation; reverse anticoagulation immediately
B. Cerebral edema from large infarction; emergent decompressive hemicraniectomy
C. Reperfusion injury; start high-dose corticosteroids and osmotic therapy
D. Contrast extravasation from blood-brain barrier disruption; supportive care and avoid aggressive BP lowering (Correct Answer)
E. Recurrent arterial occlusion; emergent repeat angiography and thrombectomy

Explanation: ***Contrast extravasation from blood-brain barrier disruption; supportive care and avoid aggressive BP lowering*** - Post-thrombectomy **hyperdensity** on CT often represents contrast that leaked through an ischemic **blood-brain barrier**, which can mimic hemorrhage but lacks significant **mass effect**. - Management is **supportive care** because the contrast is typically reabsorbed within 24–48 hours; avoiding aggressive **blood pressure lowering** prevents secondary ischemia in the penumbra. *Hemorrhagic transformation; reverse anticoagulation immediately* - While **hemorrhagic transformation** is a risk, true blood usually demonstrates higher density earlier and is associated with rapid clinical decline and **midline shift**. - Reversing anticoagulation without confirming blood on a follow-up **dual-energy CT** or MRI may lead to **stent thrombosis** or re-occlusion. *Cerebral edema from large infarction; emergent decompressive hemicraniectomy* - **Cerebral edema** typically peaks between 72–96 hours post-stroke; a presentation within 4 hours is too acute for **malignant MCA syndrome**. - While edema causes lethargy, the hyperdensity on CT more specifically points toward **contrast staining** or blood rather than simple cytotoxic edema. *Reperfusion injury; start high-dose corticosteroids and osmotic therapy* - **Corticosteroids** are not indicated for stroke-related edema or reperfusion injury as they do not improve outcomes and may increase **infection risk**. - **Osmotic therapy** is reserved for patients with clear clinical or radiologic signs of **elevated intracranial pressure**, not isolated hyperdensity on CT. *Recurrent arterial occlusion; emergent repeat angiography and thrombectomy* - **Recurrent occlusion** usually presents with a sudden recurrence of the original **focal neurological deficits** (e.g., hemiplegia, aphasia) rather than progressive lethargy. - The presence of **hyperdensity** in the stroke territory on CT is specifically indicative of material (contrast or blood) being present, which is not a feature of a simple **re-occlusion**.

Question 8: An 80-year-old woman with atrial fibrillation presents 2 hours after acute ischemic stroke. NIHSS is 22. Imaging shows large left MCA territory infarction involving >1/3 of MCA territory with basilar artery occlusion. She lives alone but was independent before this event. Her family requests all possible interventions. Evaluate the management approach considering benefits versus risks.

A. Comfort measures only given poor prognosis and age
B. Thrombolysis alone as thrombectomy unlikely to benefit with established large infarction
C. Proceed with thrombolysis and thrombectomy given the therapeutic window
D. Thrombectomy only for basilar occlusion, avoid thrombolysis due to large infarction (Correct Answer)
E. Delay intervention and repeat imaging in 6 hours to assess progression

Explanation: ***Thrombectomy only for basilar occlusion, avoid thrombolysis due to large infarction*** - Intravenous **thrombolysis (IV alteplase)** is generally contraindicated or highly risky when imaging shows an established infarction involving **>1/3 of the MCA territory** due to the high risk of **hemorrhagic transformation**. - **Basilar artery occlusion** is a life-threatening emergency with a broader treatment window; mechanical **thrombectomy** can be lifesaving and is indicated even if thrombolysis is withheld. *Comfort measures only given poor prognosis and age* - Age is not a primary contraindication for intervention, especially since the patient was **independent** prior to the event (low **pre-stroke mRS**). - Family requests all possible interventions, and **basilar occlusion** has a catastrophic natural history that may be mitigated by mechanical intervention. *Thrombolysis alone as thrombectomy unlikely to benefit with established large infarction* - Thrombolysis is dangerous in this context due to the **large infarct volume** seen on imaging, which increases the likelihood of fatal **intracerebral hemorrhage**. - Thrombolysis is notably less effective for large vessel occlusions compared to **mechanical thrombectomy**, which is the gold standard for **basilar artery** recanalization. *Proceed with thrombolysis and thrombectomy given the therapeutic window* - While the patient is within the 4.5-hour window for thrombolysis, the presence of **established early ischemic changes** (>1/3 MCA territory) is a relative contraindication. - Attempting both increases the risk of **secondary hemorrhage** in the damaged MCA territory without providing significant additional benefit over thrombectomy alone for the **basilar occlusion**. *Delay intervention and repeat imaging in 6 hours to assess progression* - Delaying treatment in the setting of **basilar artery occlusion** is inappropriate, as "time is brain" and outcomes worsen significantly with every minute of **brainstem ischemia**. - Immediate decision-making is required based on the initial imaging, which already confirmed the **large-vessel occlusion** needing intervention.

Question 9: A 58-year-old woman with history of TIA 3 weeks ago presents with acute ischemic stroke. Imaging reveals new right MCA infarction and severe (70-99%) symptomatic right carotid stenosis. She received alteplase 6 hours ago with partial improvement. Her NIHSS improved from 14 to 8. Analyze the optimal timing for carotid revascularization.

A. Wait 4-6 weeks to reduce hemorrhagic transformation risk
B. Carotid stenting immediately after thrombolysis
C. Emergent carotid endarterectomy within 24 hours
D. Carotid endarterectomy within 2 weeks of symptom onset (Correct Answer)
E. Medical management only due to recent thrombolysis

Explanation: ***Carotid endarterectomy within 2 weeks of symptom onset*** - For patients with **symptomatic carotid stenosis** (70-99%), early revascularization within **2 weeks** (ideally within 48 hours to 7 days) provides the maximum benefit in preventing recurrent stroke. - Current guidelines suggest that once the patient is **neurologically stable** and the infarct size is not massive, the risk of recurrence outweighs the risk of **hemorrhagic transformation**. *Wait 4-6 weeks to reduce hemorrhagic transformation risk* - This represents older clinical practice; modern evidence shows the risk of **recurrent stroke** is highest in the first 2 weeks, making this delay dangerous. - Waiting this long is only typically reserved for patients with a **large territory infarct** (high NIHSS) or those at very high risk for bleeding complications. *Carotid stenting immediately after thrombolysis* - Immediate stenting right after **alteplase** administration increases the risk of **intracranial hemorrhage** and local bleeding at the access site due to systemic fibrinolysis. - While **Carotid Artery Stenting (CAS)** is an alternative, it is generally not preferred over **Carotid Endarterectomy (CEA)** in older patients unless specific surgical contraindications exist. *Emergent carotid endarterectomy within 24 hours* - Performing surgery within the first 24 hours after **thrombolytic therapy** carries a significant risk of **hemorrhagic transformation** of the fresh infarct. - Most surgeons prefer to wait at least **24-48 hours** post-alteplase to ensure the fibrinolytic effects have resolved and the patient's neurological status is stable. *Medical management only due to recent thrombolysis* - Medical management alone is insufficient for **symptomatic stenosis >70%**, as the risk of a disabling stroke remains high without mechanical intervention. - **Dual antiplatelet therapy** and statins are vital, but they serve as an adjunct to, rather than a replacement for, **surgical revascularization** in fit patients.

Question 10: A 62-year-old man received IV alteplase 45 minutes ago for acute ischemic stroke. He now develops sudden severe headache, vomiting, and decreased level of consciousness. His blood pressure is 190/110 mmHg. Analyze the most critical immediate steps in management.

A. Stop alteplase, observe, and repeat CT in 24 hours
B. Administer labetalol for blood pressure and continue monitoring
C. Obtain emergent CT head, stop alteplase, give cryoprecipitate and tranexamic acid (Correct Answer)
D. Continue alteplase and give mannitol for cerebral edema
E. Give protamine sulfate and arrange for neurosurgical consultation

Explanation: ***Obtain emergent CT head, stop alteplase, give cryoprecipitate and tranexamic acid*** - Sudden headache and neurologic decline during **alteplase** infusion are hallmarks of **symptomatic intracranial hemorrhage (sICH)**, necessitating immediate cessation of the drug and diagnostic imaging. - Reversal of fibrinolysis is critical; **cryoprecipitate** provides **fibrinogen** and Factor VIII, while **tranexamic acid** or aminocaproic acid inhibits further fibrinolysis. *Stop alteplase, observe, and repeat CT in 24 hours* - Delaying a CT scan for 24 hours is inappropriate for an acute neurological change, as active bleeding requires **emergent intervention**. - Observation alone is insufficient; **active reversal** of coagulopathy is needed to prevent hematoma expansion and brain herniation. *Administer labetalol for blood pressure and continue monitoring* - While **blood pressure management** is important (targeting <180/105 mmHg), it is secondary to stopping the thrombolytic and confirming hemorrhage. - Monitoring without stopping the infusion would allow the **thrombolytic agent** to continue exacerbating the intracranial bleed. *Continue alteplase and give mannitol for cerebral edema* - Continuing **alteplase** in the setting of suspected hemorrhage is contraindicated and life-threatening. - **Mannitol** addresses intracranial pressure but does not treat the underlying **coagulopathy** causing the hemorrhage. *Give protamine sulfate and arrange for neurosurgical consultation* - **Protamine sulfate** is the reversal agent for **heparin**, not alteplase, and has no effect on fibrinolysis. - While neurosurgical consultation is necessary, the medical reversal of the **thrombolytic effect** with blood products is the most immediate priority.

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free