Blood pressure management in stroke US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Blood pressure management in stroke. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Blood pressure management in stroke US Medical PG Question 1: A 72-year-old man comes to the emergency department because of blurry vision for the past 3 days. He has also had 4 episodes of right-sided headaches over the past month. He has no significant past medical history. His father died of coronary artery disease at the age of 62 years. His temperature is 37.2°C (99°F), pulse is 94/min, and blood pressure is 232/128 mm Hg. Fundoscopy shows right-sided optic disc blurring and retinal hemorrhages. A medication is given immediately. Five minutes later, his pulse is 75/min and blood pressure is 190/105 mm Hg. Which of the following drugs was most likely administered?
- A. Nicardipine
- B. Hydralazine
- C. Nitroprusside
- D. Fenoldopam
- E. Labetalol (Correct Answer)
Blood pressure management in stroke Explanation: ***Labetalol***
- This patient presents with **malignant hypertension** given the severely elevated blood pressure (232/128 mm Hg) and signs of **end-organ damage** (blurry vision, optic disc blurring, retinal hemorrhages suggesting hypertensive retinopathy, and new-onset headaches).
- **Labetalol** is a mixed alpha- and beta-blocker commonly used in hypertensive emergencies because of its **rapid onset of action** and ability to effectively lower blood pressure without causing significant reflex tachycardia. The decrease in pulse rate from 94/min to 75/min after administration is consistent with its beta-blocking effects.
*Nicardipine*
- **Nicardipine** is a dihydropyridine calcium channel blocker that primarily causes **vasodilation**, making it effective in hypertensive emergencies.
- While it would lower blood pressure, it typically causes **reflex tachycardia** due to vasodilation, which is not observed in this patient (pulse decreased).
*Hydralazine*
- **Hydralazine** is a direct arterial vasodilator often used in hypertensive emergencies, but it typically causes a more pronounced **reflex tachycardia** than calcium channel blockers.
- Its onset of action can also be less predictable, and its use is generally avoided if there's evidence of **coronary artery disease** due to the risk of increased myocardial oxygen demand.
*Nitroprusside*
- **Nitroprusside** is a powerful balanced arterial and venous vasodilator, leading to a rapid and significant drop in blood pressure.
- It is known for causing **reflex tachycardia** and has a risk of **cyanide toxicity** with prolonged use, making its use in this scenario less ideal given the patient's existing elevated pulse.
*Fenoldopam*
- **Fenoldopam** is a dopamine-1 receptor agonist that causes vasodilation and improves renal blood flow, useful in hypertensive emergencies.
- Like other vasodilators, it can cause **reflex tachycardia** and may lead to increased intraocular pressure, which would be a concern in a patient with acute blurry vision.
Blood pressure management in stroke US Medical PG Question 2: What is the primary mechanism for maintaining constant cerebral blood flow despite changes in systemic blood pressure?
- A. Endothelial factors
- B. Baroreceptor reflex
- C. Myogenic autoregulation (Correct Answer)
- D. Metabolic control
Blood pressure management in stroke Explanation: ***Myogenic autoregulation***
- **Myogenic autoregulation** is the intrinsic ability of vascular smooth muscle to contract when stretched by increased blood pressure, thereby maintaining a constant cerebral blood flow.
- This mechanism operates within a specific range of mean arterial pressures (typically **60-150 mmHg**) to prevent both hypoperfusion and hyperperfusion of the brain.
*Endothelial factors*
- Endothelial cells release various vasoactive substances like **nitric oxide** and **endothelin**, which influence vascular tone.
- While important for local blood flow regulation, these factors play a secondary role to myogenic autoregulation in maintaining constant cerebral blood flow against systemic pressure changes.
*Baroreceptor reflex*
- The **baroreceptor reflex** primarily controls systemic blood pressure by regulating heart rate and peripheral vascular resistance.
- It does not directly regulate cerebral blood flow stability in response to systemic pressure changes; its main role is to stabilize the overall systemic arterial pressure.
*Metabolic control*
- **Metabolic control** regulates cerebral blood flow in response to the brain's metabolic demands, primarily by sensing local concentrations of **CO2**, **pH**, and **oxygen**.
- While essential for matching blood supply to neuronal activity, it is not the primary mechanism for maintaining cerebral blood flow despite changes in systemic blood pressure.
Blood pressure management in stroke US Medical PG Question 3: A 52-year-old woman is brought to the emergency department for a severe, sudden-onset headache, light-sensitivity, and neck stiffness that began 30 minutes ago. A CT scan of the head shows hyperdensity between the arachnoid mater and the pia mater. The patient undergoes an endovascular procedure. One week later, she falls as she is returning from the bathroom. Neurologic examination shows 3/5 strength in the right lower extremity and 5/5 in the left lower extremity. Treatment with which of the following drugs is most likely to have prevented the patient's current condition?
- A. Fosphenytoin
- B. Nitroglycerin
- C. Enalapril
- D. Fresh frozen plasma
- E. Nimodipine (Correct Answer)
Blood pressure management in stroke Explanation: ***Nimodipine***
- The patient experienced a **subarachnoid hemorrhage (SAH)**, indicated by the sudden-onset severe headache, neck stiffness, light sensitivity, and hyperdensity between the arachnoid and pia mater on CT scan.
- **Nimodipine**, a calcium channel blocker, is used to prevent **cerebral vasospasm** following SAH, which can lead to delayed cerebral ischemia and focal neurological deficits like the patient's new right lower extremity weakness.
*Fosphenytoin*
- **Fosphenytoin** is an **anticonvulsant** used to treat or prevent seizures.
- While seizures can occur after SAH, there is no mention of seizure activity in this patient, and fosphenytoin would not prevent **vasospasm-induced ischemia**.
*Nitroglycerin*
- **Nitroglycerin** is a potent **vasodilator** primarily used to treat angina and heart failure.
- It rapidly lowers blood pressure and would not be used to prevent cerebral vasospasm after SAH, and could potentially worsen cerebral perfusion if blood pressure drops too low.
*Enalapril*
- **Enalapril** is an **ACE inhibitor** used to treat hypertension and heart failure.
- It is a long-acting antihypertensive and is not indicated for the prevention of **cerebral vasospasm** after SAH.
*Fresh frozen plasma*
- **Fresh frozen plasma (FFP)** is used to replace clotting factors in patients with coagulopathies or significant bleeding.
- While SAH involves bleeding, FFP would be used to reverse anticoagulant effects or treat a severe clotting factor deficiency, not to prevent **delayed ischemic deficits** from vasospasm.
Blood pressure management in stroke US Medical PG Question 4: A 51-year-old man presents to the urgent care center with a blood pressure of 201/111 mm Hg. He is complaining of a severe headache and chest pain. Physical examination reveals regular heart sounds and clear bilateral lung sounds. Ischemic changes are noted on his electrocardiogram (ECG). What is the most appropriate treatment for this patient’s high blood pressure?
- A. IV labetalol - lower mean arterial pressure no more than 25% over the 1st hour (Correct Answer)
- B. Oral clonidine - gradually lower blood pressure over 24–48 hours
- C. Oral beta-blocker - lower mean arterial pressure no more than 25% over the 1st hour
- D. IV labetalol - lower mean arterial pressure no more than 50% over the 1st hour
- E. IV labetalol - redose until blood pressure within normal limits
Blood pressure management in stroke Explanation: ***IV labetalol - lower mean arterial pressure no more than 25% over the 1st hour***
- This patient presents with **hypertensive emergency**, indicated by severe hypertension (BP 201/111 mmHg) and evidence of **acute target organ damage** (severe headache, chest pain, ischemic ECG changes).
- **IV labetalol** is an appropriate first-line agent, and the goal is to **gradually reduce** the mean arterial pressure by no more than **25% within the first hour** to prevent hypoperfusion and ischemic events.
*Oral clonidine - gradually lower blood pressure over 24–48 hours*
- **Oral clonidine** has a slower onset of action and is not suitable for the **urgent reduction** required in a hypertensive emergency.
- This approach is more appropriate for **gradual blood pressure reduction** in less severe hypertension or as an adjunct in chronic management.
*Oral beta-blocker - lower mean arterial pressure no more than 25% over the 1st hour*
- **Oral medications** are generally not preferred for initial management of **hypertensive emergencies** due to their slower onset and less predictable dose titration compared to intravenous agents.
- While beta-blockers can be effective, the **oral route** is inappropriate for the acute, rapid control needed for this condition.
*IV labetalol - lower mean arterial pressure no more than 50% over the 1st hour*
- A rapid reduction of **50% in MAP** within the first hour is too aggressive and carries a significant risk of **hypoperfusion** to vital organs, potentially leading to **stroke**, **myocardial infarction**, or **renal failure**.
- The recommended initial reduction is **no more than 25%** in the first hour to maintain adequate organ perfusion.
*IV labetalol - redose until blood pressure within normal limits*
- Aggressively lowering blood pressure to **"normal limits"** too quickly can cause cerebral, cardiac, or renal **ischemia** due to loss of autoregulation in previously hypertensive patients.
- The goal is to first stabilize the patient by reducing the BP by a controlled amount, not to normalize it immediately.
Blood pressure management in stroke US Medical PG Question 5: A 78-year-old man is brought in to the emergency department by ambulance after his wife noticed that he began slurring his speech and had developed facial asymmetry during dinner approximately 30 minutes ago. His past medical history is remarkable for hypertension and diabetes. His temperature is 99.1°F (37.3°C), blood pressure is 154/99 mmHg, pulse is 89/min, respirations are 12/min, and oxygen saturation is 98% on room air. Neurologic exam reveals right upper and lower extremity weakness and an asymmetric smile. Which of the following is the next best step in management?
- A. Alteplase
- B. MRI brain
- C. CT head (Correct Answer)
- D. Aspirin
- E. CTA head
Blood pressure management in stroke Explanation: ***CT head***
- A **non-contrast CT head** is the immediate priority to differentiate between ischemic and hemorrhagic stroke, which is critical for guiding subsequent treatment decisions.
- Given the patient's acute neurological deficits (slurred speech, facial asymmetry, weakness) and vascular risk factors (hypertension, diabetes), **stroke is highly suspected**, and identifying intracerebral hemorrhage is crucial before considering thrombolytic therapy.
*Alteplase*
- **Alteplase** (tPA) is a thrombolytic agent used for acute ischemic stroke, but its administration is **contraindicated in hemorrhagic stroke**.
- Initiating alteplase without first ruling out hemorrhage with a CT scan could lead to catastrophic bleeding.
*MRI brain*
- While an **MRI brain** can provide more detailed imaging of stroke, it is typically **not the initial imaging modality** in the emergency setting due to longer acquisition times and limited availability, especially when emergent differentiation between ischemic and hemorrhagic stroke is needed.
- Its use is usually reserved for cases where the CT is inconclusive or for later evaluation.
*Aspirin*
- **Aspirin** is an antiplatelet agent used in the management of ischemic stroke, but it should **not be given until a hemorrhagic stroke has been ruled out** via CT head.
- Administering aspirin in the context of an intracerebral hemorrhage could worsen bleeding.
*CTA head*
- A **CT angiography (CTA) head** is used to visualize the cerebral vasculature and identify large vessel occlusions, which can guide thrombectomy decisions in ischemic stroke.
- However, performing a **non-contrast CT head is a prerequisite** to rule out hemorrhage before proceeding with CTA or any other advanced imaging or therapeutic interventions.
Blood pressure management in stroke US Medical PG Question 6: A 44-year-old female is admitted to the neurological service. You examine her chart and note that after admission she was started on nimodipine. Which of the following pathologies would benefit from this pharmacologic therapy?
- A. Thromboembolic stroke
- B. Subdural hematoma
- C. Epidural hematoma
- D. Pseudotumor cerebri
- E. Subarachnoid hemorrhage (Correct Answer)
Blood pressure management in stroke Explanation: ***Subarachnoid hemorrhage***
- Nimodipine is a **calcium channel blocker** specifically used to prevent and treat **cerebral vasospasm** following a subarachnoid hemorrhage.
- Vasospasm is a common and often devastating complication that can lead to delayed cerebral ischemia and poor neurological outcomes.
*Thromboembolic stroke*
- Treatment for thromboembolic stroke focuses on **reperfusion therapies** (e.g., tPA, thrombectomy) and antiplatelet/anticoagulant medications.
- Nimodipine does not play a role in the acute management or prevention of tissue damage in ischemic stroke.
*Subdural hematoma*
- Subdural hematomas are collections of blood between the dura and arachnoid mater, usually resulting from **head trauma**.
- Management typically involves **surgical evacuation** if symptomatic, and nimodipine is not indicated.
*Epidural hematoma*
- Epidural hematomas involve bleeding between the dura mater and the skull, often due to **arterial injury** from head trauma.
- These are surgical emergencies, and nimodipine has no therapeutic role.
*Pseudotumor cerebri*
- Also known as **idiopathic intracranial hypertension**, this condition involves elevated intracranial pressure without a mass lesion.
- Treatment focuses on reducing CSF pressure, often with diuretics (e.g., acetazolamide), and nimodipine is not part of the management.
Blood pressure management in stroke US Medical PG Question 7: A 74-year-old man presents to the emergency department by paramedics for slurred speech and weakness in the left arm and leg for 1 hour. The patient was playing with his grandson when the symptoms started and his wife immediately called an ambulance. There is no history of head trauma or recent surgery. The patient takes captopril for hypertension. The vital signs include: pulse 110/min, respiratory rate 22/min, and blood pressure 200/105 mm Hg. The physical examination shows that the patient is alert and conscious, but speech is impaired. Muscle strength is 0/5 in the left arm and leg and 5/5 in the right arm and leg. A non-contrast CT of the head shows no evidence of intracranial bleeding. The lab results are as follows:
Serum glucose 90 mg/dL
Sodium 140 mEq/L
Potassium 4.1 mEq/L
Chloride 100 mEq/L
Serum creatinine 1.3 mg/dL
Blood urea nitrogen 20 mg/dL
Cholesterol, total 240 mg/dL
HDL-cholesterol 38 mg/dL
LDL-cholesterol 100 mg/dL
Triglycerides 190 mg/dL
Hemoglobin (Hb%) 15.3 g/dL
Mean corpuscular volume (MCV) 83 fL
Reticulocyte count 0.8%
Erythrocyte count 5.3 million/mm3
Platelet count 130,000/mm3
Partial thromboplastin time (aPTT) 30 sec
Prothrombin time (PT) 12 sec
Although he is within the time frame for the standard therapy of the most likely condition, the treatment cannot be started because of which of the following contraindications?
- A. A platelet count of 130,000/mm3
- B. Age of 74 years
- C. Cholesterol level of 240 mg/dL
- D. Creatinine level of 1.3 mg/dL
- E. Systolic blood pressure of 200 mm Hg (Correct Answer)
Blood pressure management in stroke Explanation: ***Systolic blood pressure of 200 mm Hg***
- The patient presents with symptoms highly suggestive of an **acute ischemic stroke**, including **slurred speech** and **left-sided weakness**.
- For patients with acute ischemic stroke who are candidates for **thrombolytic therapy (e.g., alteplase)**, a **systolic blood pressure consistently >185 mm Hg or diastolic >110 mm Hg is a contraindication** due to increased risk of hemorrhagic transformation.
*A platelet count of 130,000/mm3*
- A platelet count of 130,000/mm³ is above the **contraindication threshold for thrombolytic therapy**, which is typically <100,000/mm³.
- Therefore, this platelet count would **not prevent** the initiation of tPA.
*Age of 74 years*
- While older age was once considered a relative contraindication, current guidelines **do not consider age alone (including 74 years old) as an absolute contraindication** for thrombolytic therapy in acute ischemic stroke.
- Eligibility is determined by a comprehensive risk-benefit assessment, not solely by age.
*Cholesterol level of 240 mg/dL*
- An elevated **cholesterol level** is a **risk factor for atherosclerosis** and ischemic stroke, but it is **not a contraindication for acute thrombolytic therapy**.
- It relates to the underlying cause of the stroke rather than the immediate treatment decision.
*Creatinine level of 1.3 mg/dL*
- A **creatinine level of 1.3 mg/dL** indicates **mild renal impairment**, but it is **not a contraindication for thrombolytic therapy**.
- Renal function more significantly impacts the use of certain anticoagulants, but not typically alteplase in the acute setting.
Blood pressure management in stroke US Medical PG Question 8: A 69-year-old man is brought by his son to the emergency department with weakness in his right arm and leg. The man insists that he is fine and blames his son for "creating panic". Four hours ago the patient was having tea with his wife when he suddenly dropped his teacup. He has had difficulty moving his right arm since then and cannot walk because his right leg feels stuck. He has a history of hypertension and dyslipidemia, for which he currently takes lisinopril and atorvastatin, respectively. He is allergic to aspirin and peanuts. A computerized tomography (CT) scan shows evidence of an ischemic stroke. Which medication would most likely prevent such attacks in this patient in the future?
- A. Celecoxib
- B. Abciximab
- C. Urokinase
- D. Clopidogrel (Correct Answer)
- E. Alteplase
Blood pressure management in stroke Explanation: ***Clopidogrel***
- This patient has suffered an **ischemic stroke** and has a **contraindication to aspirin** due to allergy. **Clopidogrel**, an **alternative antiplatelet agent**, is the most appropriate long-term secondary prevention medication to reduce the risk of future thrombotic events.
- As a **P2Y12 inhibitor**, clopidogrel prevents platelet aggregation, thereby reducing the likelihood of clot formation in patients at high risk for cardiovascular events.
*Celecoxib*
- **Celecoxib** is a **COX-2 selective NSAID** primarily used for pain and inflammation. It has no role in the prevention of ischemic stroke.
- While NSAIDs can have antiplatelet effects through COX-1 inhibition, **COX-2 selective inhibitors like celecoxib generally have a prothrombotic effect** and are not indicated for stroke prevention.
*Abciximab*
- **Abciximab** is a **glycoprotein IIb/IIIa inhibitor** that potently prevents platelet aggregation. It is typically used in acute settings, such as during percutaneous coronary intervention (PCI), and not for long-term stroke prevention.
- Its potent antiplatelet effect and **risk of bleeding** make it unsuitable for chronic outpatient management.
*Urokinase*
- **Urokinase** is a **thrombolytic agent** used to dissolve existing blood clots in acute conditions like pulmonary embolism or acute myocardial infarction. It is not indicated for the prevention of future ischemic strokes.
- Thrombolytics carry a **significant risk of hemorrhage** and are solely for acute clot lysis, not chronic prevention.
*Alteplase*
- **Alteplase** is a **tissue plasminogen activator (tPA)**, a thrombolytic used in the **acute treatment of ischemic stroke** within a specific time window to dissolve clots and restore blood flow.
- It is an **acute rescue therapy** and is not used for long-term secondary prevention of stroke due to its high bleeding risk and short duration of action.
Blood pressure management in stroke US Medical PG Question 9: A 44-year-old man comes to the emergency department because of a severe headache and blurry vision for the past 3 hours. He has hypertension treated with hydrochlorothiazide. He has missed taking his medication for the past week as he was traveling. He is only oriented to time and person. His temperature is 37.1°C (98.8°F), pulse is 92/min and regular, and blood pressure is 245/115 mm Hg. Cardiopulmonary examination shows no abnormalities. Fundoscopy shows bilateral retinal hemorrhages and exudates. Neurologic examination shows no focal findings. A complete blood count and serum concentrations of electrolytes, glucose, and creatinine are within the reference range. A CT scan of the brain shows no abnormalities. Which of the following is the most appropriate pharmacotherapy?
- A. Sublingual nifedipine
- B. Oral captopril
- C. Intravenous nitroprusside (Correct Answer)
- D. Oral clonidine
- E. Intravenous mannitol
Blood pressure management in stroke Explanation: ***Intravenous nitroprusside***
- The patient presents with **hypertensive emergency**, characterized by **severe hypertension** (245/115 mmHg) with **acute end-organ damage**, including altered mental status and retinal hemorrhages/exudates.
- **Intravenous nitroprusside** is a potent, rapidly acting vasodilator making it an excellent choice for immediate and controlled reduction of blood pressure in such critical situations.
*Sublingual nifedipine*
- **Sublingual nifedipine** can cause a sudden and uncontrolled drop in blood pressure, leading to **ischemia** due to inadequate perfusion of vital organs.
- It also has a less predictable and slower onset of action compared to intravenous agents, making it unsuitable for acute hypertensive emergencies.
*Oral captopril*
- **Oral captopril** has a slower onset of action and is less suitable for the acute management of a **hypertensive emergency** where immediate and precise blood pressure control is crucial.
- While an ACE inhibitor, its oral administration does not provide the rapid titratability needed to safely lower dangerously high blood pressures.
*Oral clonidine*
- **Oral clonidine** also has a relatively slow onset of action and its effects can be variable, making it less ideal for the acute, emergent management of **severe hypertension** with end-organ damage.
- It is more appropriate for urgent but non-emergent hypertension or chronic management, not for situations requiring immediate and controlled blood pressure reduction.
*Intravenous mannitol*
- **Intravenous mannitol** is an osmotic diuretic primarily used to reduce **intracranial pressure** or to promote diuresis.
- It does not directly lower blood pressure effectively in a hypertensive emergency and is not a primary antihypertensive agent.
Blood pressure management in stroke US Medical PG Question 10: A 37-year-old woman presents to her physician with a newly detected pregnancy for the initial prenatal care visit. She is gravida 3 para 2 with a history of preeclampsia in her 1st pregnancy. Her history is also significant for arterial hypertension diagnosed 1 year ago for which she did not take any medications. The patient reports an 8-pack-year smoking history and states she quit smoking a year ago. On examination, the vital signs are as follows: blood pressure 140/90 mm Hg, heart rate 69/min, respiratory rate 14/min, and temperature 36.6°C (97.9°F). The physical examination is unremarkable. Which of the following options is the most appropriate next step in the management for this woman?
- A. Methyldopa (Correct Answer)
- B. Magnesium sulfate
- C. Fosinopril
- D. Labetalol
- E. No medications needed
Blood pressure management in stroke Explanation: ***Methyldopa***
- **Methyldopa** is a **centrally acting alpha-2 adrenergic agonist** that is considered a first-line agent for the treatment of **chronic hypertension in pregnancy**.
- Its **safety profile** and effectiveness in controlling blood pressure without significant fetal harm make it an appropriate choice.
*Magnesium sulfate*
- **Magnesium sulfate** is primarily used for the **prevention and treatment of seizures in preeclampsia** and **eclampsia**.
- It is not indicated for the chronic management of hypertension and is prescribed for specific acute indications during pregnancy.
*Fosinopril*
- **Fosinopril** is an **ACE inhibitor**, which is **contraindicated in pregnancy** due to its association with **fetal renal dysfunction**, **oligohydramnios**, and **malformations**, especially in the second and third trimesters.
- ACE inhibitors and ARBs should be avoided during pregnancy.
*Labetalol*
- **Labetalol** is an **alpha and beta-blocker that can be used for chronic hypertension in pregnancy**, but given the patient's history of asthma (implied through a history of smoking), **methyldopa** might be a slightly safer initial choice, although labetalol could also be considered.
- While generally safe, its use can be associated with **fetal growth restriction** and **neonatal bradycardia** if used indiscriminately, making methyldopa a preferred first-line agent in many cases.
*No medications needed*
- The patient has **chronic hypertension** (diagnosed 1 year ago) and previous **preeclampsia**, indicating a need for **antihypertensive management** to prevent adverse maternal and fetal outcomes.
- Not initiating treatment would put the patient at increased risk for **severe preeclampsia**, **placental abruption**, and other complications.
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