Collapse and syncope — MCQs

10 questions

A 46-year-old man presents with acute onset severe abdominal pain and shock. He takes warfarin for atrial fibrillation. His INR is 6.8. CT shows retroperitoneal hematoma. What is the most appropriate immediate management?

A 46-year-old man presents with acute severe epigastric pain and vomiting. His amylase (1800 U/L). He has a history of alcohol excess. What is the most important initial assessment?

A 39-year-old man presents with acute onset severe headache during sexual intercourse. CT head is normal. What is the most appropriate next investigation?

A 67-year-old man with COPD presents with acute confusion and drowsiness. ABG shows pH 7.25, pCO2 8.5 kPa, pO2 7.2 kPa, HCO3- 28 mmol/L. What is the most appropriate immediate management?

A 70-year-old man presents with sudden onset weakness in his right arm and difficulty speaking. CT head shows acute infarct in the left middle cerebral artery territory. He arrived 2 hours after symptom onset. What is the most appropriate treatment?

A 28-year-old man presents with sudden onset severe headache described as "worst headache of my life." He is photophobic and has neck stiffness. CT head is normal. What is the next most appropriate investigation?

A 75-year-old man presents with sudden onset weakness of his right arm and leg, and speech difficulties that started 1 hour ago. His NIHSS score is 8. CT head shows no hemorrhage. What is the most appropriate treatment?

A 72-year-old man presents with sudden onset weakness of his right arm and leg, and speech difficulties that started 1 hour ago. His NIHSS score is 8. CT head shows no hemorrhage. What is the most appropriate treatment?

A 26-year-old woman presents with sudden onset severe headache and neck stiffness. She has a petechial rash on her arms and legs. Temperature is 38.8°C. What is the most appropriate immediate management?

Q10

A 38-year-old woman presents with sudden onset severe chest pain and dyspnea. She is 3 weeks postpartum and has been immobile due to cesarean complications. D-dimer is elevated. What is the most appropriate initial investigation?

Collapse and syncope UK Medical PG Practice Questions and MCQs

Question 1: A 46-year-old man presents with acute onset severe abdominal pain and shock. He takes warfarin for atrial fibrillation. His INR is 6.8. CT shows retroperitoneal hematoma. What is the most appropriate immediate management?

A. Vitamin K 10mg IV
B. Fresh frozen plasma
C. Prothrombin complex concentrate (Correct Answer)
D. Stop warfarin only
E. Tranexamic acid

Explanation: ***Prothrombin complex concentrate***- This patient presents with **major hemorrhage** (retroperitoneal hematoma) and **shock** due to severe **warfarin coagulopathy** (INR 6.8).- **PCC** provides the fastest and most complete reversal of **Vitamin K antagonist** effects by supplying factors II, VII, IX, and X, crucial for immediate **hemostasis** in life-threatening bleeding.*Vitamin K 10mg IV*- While essential for long-term factor replenishment, **intravenous Vitamin K** has a delayed onset of action, typically taking 6 to 12 hours to significantly reduce the INR.- It is always administered alongside a rapid reversal agent (like PCC) in cases of life-threatening bleeding but is insufficient as the *only* immediate management due to its slow effect.*Fresh frozen plasma*- FFP contains all necessary clotting factors but requires large volumes, is slow to infuse, necessitates **ABO compatibility** testing, and carries a significant risk of **transfusion-associated circulatory overload (TACO)**.- Current guidelines reserve FFP mainly for situations where PCC is unavailable or for specific coagulopathies not covered by PCC.*Stop warfarin only*- Stopping the drug is necessary to prevent further anticoagulation, but the half-lives of the affected clotting factors are long; stopping warfarin alone will not acutely correct the life-threatening coagulopathy needed to stop the active **retroperitoneal hemorrhage**.- Immediate administration of factor concentrates (PCC) or plasma products is required for rapid **hemostatic resuscitation**.*Tranexamic acid*- **Tranexamic acid** is an **antifibrinolytic** agent that works by stabilizing clots by inhibiting plasminogen activation.- It is not the appropriate first-line therapy for reversing the underlying severe **deficiency of Vitamin K-dependent clotting factors** caused by warfarin overdose, which is the primary issue here.

Question 2: A 46-year-old man presents with acute severe epigastric pain and vomiting. His amylase (1800 U/L). He has a history of alcohol excess. What is the most important initial assessment?

A. CT abdomen
B. ERCP
C. Severity scoring (Correct Answer)
D. Nutritional assessment
E. Psychiatric evaluation

Explanation: ***Severity scoring*** - **Initial assessment** in acute pancreatitis focuses on determining severity using tools like the **Ranson criteria**, **APACHE II**, or the **modified Glasgow criteria** to triage care. - Early identification of patients with predicted **severe disease** is crucial for appropriate resource allocation, aggressive fluid resuscitation, and monitoring (often in the ICU). *CT abdomen* - Routine CT is not necessary for the initial diagnosis, which is based on clinical presentation and markedly elevated **amylase/lipase** (Amylase 1800 U/L). - CT imaging is typically reserved for diagnosing complications (e.g., **necrosis** or fluid collections) or if the patient fails to improve clinically after 48-72 hours. *ERCP* - **Endoscopic retrograde cholangiopancreatography (ERCP)** is an intervention, not an initial assessment, primarily indicated for emergent management of acute **biliary obstruction** with concurrent **cholangitis** (infection of bile ducts). - It carries risks, including worsening pancreatitis, and is only performed urgently in a small subset of patients with biliary etiology. *Nutritional assessment* - While important, nutritional assessment is secondary to immediate priorities like **hemodynamic stabilization**, pain control, and severity grading during the first 24-48 hours. - The decision to initiate nutritional support (preferably enteral feeding) is generally based on the predicted **severity score** and the expected duration of the fasting period. *Psychiatric evaluation* - Although the patient has a history of **alcohol excess**, which necessitates later evaluation and counseling, emergent psychiatric evaluation is not the most critical component of the initial medical assessment for acute pancreatitis. - The immediate priority remains stabilization and management of the acute, life-threatening abdominal crisis.

Question 3: A 39-year-old man presents with acute onset severe headache during sexual intercourse. CT head is normal. What is the most appropriate next investigation?

A. MRI brain
B. Lumbar puncture (Correct Answer)
C. CT angiogram
D. Carotid Doppler
E. EEG

Explanation: ***Lumbar puncture***- This presentation with an acute onset severe headache during sexual intercourse (a **thunderclap headache**) is highly suggestive of **subarachnoid hemorrhage (SAH)**, even if the initial **CT head** is normal.- A **lumbar puncture** is the most appropriate next step to look for **xanthochromia** in the CSF, which confirms SAH, especially if performed 6-12 hours after symptom onset.*MRI brain*- While **MRI** with FLAIR sequences can detect subarachnoid blood, it is generally considered less sensitive than a **lumbar puncture** for ruling out SAH after a negative CT scan.- It is often reserved for cases where SAH is strongly suspected but the LP is inconclusive, or for evaluating the cause of SAH once confirmed.*CT angiogram*- **CT angiogram (CTA)** is primarily used to identify the source of bleeding, such as an **aneurysm**, once SAH has been confirmed.- It is not the initial diagnostic test to confirm the presence of **subarachnoid hemorrhage** itself when a non-contrast CT is normal.*Carotid Doppler*- A **Carotid Doppler** ultrasound assesses for **carotid artery stenosis** or dissection in the neck vessels.- This investigation is not relevant for the acute evaluation of a **thunderclap headache**, which indicates an intracranial event like SAH.*EEG*- An **EEG (electroencephalogram)** measures brain electrical activity and is used to diagnose conditions such as **seizures** or certain encephalopathies.- It has no diagnostic value in the acute assessment of a **thunderclap headache** or suspected subarachnoid hemorrhage.

Question 4: A 67-year-old man with COPD presents with acute confusion and drowsiness. ABG shows pH 7.25, pCO2 8.5 kPa, pO2 7.2 kPa, HCO3- 28 mmol/L. What is the most appropriate immediate management?

A. High-flow oxygen
B. Non-invasive ventilation (Correct Answer)
C. Intubation and mechanical ventilation
D. IV bicarbonate
E. Controlled oxygen therapy

Explanation: ***Non-invasive ventilation***- This patient presents with severe acute hypercapnic respiratory failure (pH 7.25, pCO2 8.5 kPa) and altered mental status (confusion, drowsiness), making **Non-invasive ventilation (NIV)** the most appropriate immediate intervention.- NIV (typically BiPAP) is the first-line treatment for acute exacerbations of COPD causing respiratory acidosis, as it effectively reduces **pCO2** and improves **pH** without the invasiveness of intubation.*High-flow oxygen*- High-flow oxygen risks abolishing the **hypoxic drive** in COPD patients, potentially worsening the already severe **hypercapnia** and respiratory acidosis.- It does not address the underlying problem of inadequate ventilation, which is the primary cause of the elevated pCO2.*Intubation and mechanical ventilation*- This aggressive intervention is generally reserved for patients who have failed NIV, are in **cardiac or respiratory arrest**, or have profound **coma** (e.g., GCS < 8).- Prioritizing NIV is crucial as it significantly reduces the morbidity and mortality associated with **invasive mechanical ventilation**.*IV bicarbonate*- Bicarbonate is generally contraindicated in primary **respiratory acidosis** because its metabolism produces CO2, which the patient is unable to adequately excrete.- The appropriate treatment is to improve ventilation to eliminate excess **CO2**, not to directly buffer the acidosis with bicarbonate.*Controlled oxygen therapy*- While controlled oxygen (e.g., 24-28% via Venturi mask) is the initial standard for hypoxemia in stable COPD, it is inadequate for this level of severe **hypercapnia** and altered mental status (**CO2 narcosis**).- Given the severe **acidosis** (pH 7.25) and impaired consciousness, immediate ventilatory support like NIV is mandatory to improve minute ventilation.

Question 5: A 70-year-old man presents with sudden onset weakness in his right arm and difficulty speaking. CT head shows acute infarct in the left middle cerebral artery territory. He arrived 2 hours after symptom onset. What is the most appropriate treatment?

A. Aspirin 300mg
B. Alteplase (Correct Answer)
C. Clopidogrel
D. Warfarin
E. Heparin

Explanation: ***Alteplase*** (Also known as **tPA**, or tissue plasminogen activator) - This patient is eligible for intravenous thrombolysis because he presented within **2 hours** of symptom onset, well within the 4.5-hour window for administering **Alteplase** to reverse acute ischemic stroke. - **Alteplase** directly breaks down the clot (thrombolysis), offering the highest chance of achieving reperfusion and minimizing long-term neurological deficit in eligible patients. *Aspirin 300mg* - Aspirin is an antiplatelet agent used for acute stroke management, but it is typically started **24 hours after Alteplase** administration to prevent hemorrhagic transformation risk. - If the patient is ineligible for thrombolysis (e.g., outside the time window or has clear contraindications), aspirin is often the preferred initial treatment, but it is **not the most appropriate** intervention when thrombolytic eligibility exists. *Clopidogrel* - Clopidogrel is an antiplatelet agent used primarily for **secondary prevention** of stroke, often in combination with aspirin (dual antiplatelet therapy) for certain high-risk situations (e.g., minor stroke/TIA). - It is not indicated as the primary, immediate treatment for **acute revascularization** in a patient eligible for thrombolysis. *Warfarin* - **Warfarin** is an oral anticoagulant used for **secondary prevention** in specific stroke etiologies, primarily those due to cardioembolism (e.g., atrial fibrillation). - Anticoagulation (including Warfarin) is generally avoided in the very acute phase of ischemic stroke due to the increased risk of **hemorrhagic transformation** of the infarct. *Heparin* - Heparin (unfractionated or LMWH) is generally **not recommended** for the routine acute treatment of non-cardioembolic ischemic stroke due to safety concerns regarding bleeding. - Its use is typically reserved for specialized scenarios like acute **basilar artery occlusion** (if intra-arterial therapy is delayed) or confirmed **cerebral venous sinus thrombosis (CVST)**.

Question 6: A 28-year-old man presents with sudden onset severe headache described as "worst headache of my life." He is photophobic and has neck stiffness. CT head is normal. What is the next most appropriate investigation?

A. MRI brain
B. Lumbar puncture (Correct Answer)
C. CT angiogram
D. Carotid Doppler
E. EEG

Explanation: ***Lumbar puncture*** - The classic presentation of "worst headache of my life," photophobia, and neck stiffness is highly suggestive of **subarachnoid hemorrhage (SAH)**. - Even if a **CT head** is normal (especially if performed more than 6 hours after symptom onset), a **lumbar puncture** is the next critical step to check for **xanthochromia** or **red blood cells** in the CSF to confirm or exclude SAH. *MRI brain* - While MRI can detect SAH, it is **less sensitive than LP** for detecting small bleeds or chronic SAH, especially when CT is negative but clinical suspicion remains high. - It is a **longer and more expensive test** than LP and not the gold standard for ruling out SAH in this specific clinical context after a negative CT. *CT angiogram* - A **CT angiogram** is performed to identify the **source of bleeding** (e.g., an aneurysm) *after* SAH has been confirmed, not to diagnose SAH itself. - It involves **radiation** and **contrast** and is not the appropriate initial diagnostic step to rule out SAH following a normal non-contrast CT. *Carotid Doppler* - **Carotid Doppler** assesses for **carotid artery stenosis** or dissection, which typically presents with focal neurological symptoms or TIA-like events, not primarily a diffuse

Question 7: A 75-year-old man presents with sudden onset weakness of his right arm and leg, and speech difficulties that started 1 hour ago. His NIHSS score is 8. CT head shows no hemorrhage. What is the most appropriate treatment?

A. Aspirin 300mg
B. Alteplase (tPA) (Correct Answer)
C. Clopidogrel 75mg
D. Heparin
E. Warfarin

Explanation: ***Alteplase (tPA)***- This patient presents with sudden onset neurological deficits (weakness, speech difficulties) consistent with an acute **ischemic stroke**, indicated by an NIHSS score of 8 and a CT head ruling out hemorrhage. The onset was 1 hour ago, placing him well within the **4.5-hour therapeutic window** for intravenous thrombolysis.- **Alteplase (recombinant tissue plasminogen activator)** is the most appropriate and definitive acute treatment for eligible patients with acute ischemic stroke, as it aims to dissolve the clot and restore cerebral blood flow.*Aspirin 300mg*- **Aspirin** is an antiplatelet agent indicated for acute ischemic stroke but is typically administered to patients **ineligible for thrombolysis** or 24 hours after Alteplase administration to prevent early recurrence.- While important for secondary prevention, giving Aspirin alone when the patient is eligible for thrombolysis is considered inadequate for immediate clot resolution in a moderate-to-severe stroke.*Clopidogrel 75mg*- **Clopidogrel** is an antiplatelet agent primarily used for **long-term secondary prevention** of stroke or as part of dual antiplatelet therapy in specific scenarios like minor stroke or high-risk TIA.- It is not an acute reperfusion therapy and does not have the immediate clot-dissolving capability required for a moderate-to-severe acute ischemic stroke within the hyperacute window.*Heparin*- Immediate therapeutic **anticoagulation with Heparin** is generally **contraindicated** in acute ischemic stroke due to a high risk of **hemorrhagic transformation** of the infarct, which can worsen outcomes.- Heparin's use is limited to specific stroke etiologies (e.g., cerebral venous thrombosis, certain cardioembolic sources) and is usually delayed or considered after a period of observation.*Warfarin*- **Warfarin** is an oral anticoagulant used for **long-term secondary prevention** of stroke in conditions like **atrial fibrillation** or with mechanical heart valves.- It has a slow onset of action and is not suitable for acute stroke treatment; initiating Warfarin in the acute setting carries a significant risk of **intracranial hemorrhage** without providing immediate therapeutic benefit.

Question 8: A 72-year-old man presents with sudden onset weakness of his right arm and leg, and speech difficulties that started 1 hour ago. His NIHSS score is 8. CT head shows no hemorrhage. What is the most appropriate treatment?

A. Aspirin 300mg
B. Alteplase (tPA) (Correct Answer)
C. Clopidogrel 75mg
D. Heparin
E. Warfarin

Explanation: ***Alteplase (tPA)***- The patient presents with an **acute ischemic stroke** (sudden onset focal neurological deficits) within the critical **4.5-hour window** (onset 1 hour ago), and a CT head has excluded **intracranial hemorrhage**.- **Intravenous thrombolysis** with alteplase is the most appropriate treatment for eligible patients to achieve rapid reperfusion, significantly improving functional outcomes. *Aspirin 300mg*- **Aspirin** is an antiplatelet agent used in acute ischemic stroke if the patient is ineligible for thrombolysis, but it is not a reperfusion therapy.- If thrombolysis is administered, aspirin should be delayed for at least **24 hours after** alteplase to minimize the risk of hemorrhagic conversion. *Clopidogrel 75mg*- **Clopidogrel** is an antiplatelet medication primarily used for **long-term secondary prevention** of stroke, often in combination with aspirin.- It is not an acute reperfusion therapy and would not address the immediate thrombotic occlusion responsible for the acute ischemic stroke. *Heparin*- **Heparin** (anticoagulation) is generally not recommended in acute ischemic stroke due to a high risk of **hemorrhagic transformation** of the ischemic tissue.- Its use is typically limited to specific scenarios such as suspected **arterial dissection** or concurrent conditions requiring urgent anticoagulation. *Warfarin*- **Warfarin** is an oral anticoagulant used for **long-term secondary prevention** of stroke, particularly in cases of cardioembolic stroke due to **atrial fibrillation**.- It has a slow onset of action and is not appropriate for the acute management or emergent reperfusion of an ischemic stroke.

Question 9: A 26-year-old woman presents with sudden onset severe headache and neck stiffness. She has a petechial rash on her arms and legs. Temperature is 38.8°C. What is the most appropriate immediate management?

A. Lumbar puncture
B. CT head
C. Blood cultures and IV antibiotics (Correct Answer)
D. Oral antibiotics
E. Antipyretics

Explanation: ***Blood cultures and IV antibiotics*** - The presence of **sudden severe headache**, **neck stiffness**, **fever**, and a **petechial rash** is highly indicative of **meningococcal meningitis with sepsis**, a medical emergency requiring immediate intervention. - Prompt administration of **empiric intravenous antibiotics** after obtaining **blood cultures** is crucial to prevent rapid deterioration, severe complications, and death, as delays significantly worsen prognosis. *Lumbar puncture* - While essential for definitive diagnosis of meningitis, **lumbar puncture** should **not delay** the immediate initiation of empiric IV antibiotics in a patient with suspected bacterial meningitis and **petechial rash**. - An LP carries the risk of **herniation** if there's increased intracranial pressure, and antibiotics should be given even before imaging if LP causes delay. *CT head* - A **CT head** is performed to rule out **mass lesions** or **raised intracranial pressure** before a lumbar puncture in specific cases, but it should **not delay** the urgent administration of life-saving antibiotics for suspected bacterial meningitis. - In a rapidly deteriorating patient with suspected meningococcal sepsis, empirical antibiotics take precedence over imaging or diagnostic procedures that could cause delay. *Oral antibiotics* - The patient's severe presentation with signs of **meningitis** and **sepsis** necessitates rapid and high concentrations of antibiotics, which can only be achieved via the **intravenous route**. - **Oral antibiotics** are inadequate for treating severe, life-threatening infections like bacterial meningitis due to insufficient bioavailability and delayed systemic and CNS penetration. *Antipyretics* - **Antipyretics** help reduce fever and improve patient comfort but do **not treat the underlying bacterial infection** that is rapidly progressing and life-threatening. - While useful for symptom management, they are **not the most appropriate immediate management** as definitive treatment of the infection is the priority.

Question 10: A 38-year-old woman presents with sudden onset severe chest pain and dyspnea. She is 3 weeks postpartum and has been immobile due to cesarean complications. D-dimer is elevated. What is the most appropriate initial investigation?

A. Chest X-ray
B. ECG
C. CT pulmonary angiogram (Correct Answer)
D. V/Q scan
E. Echocardiogram

Explanation: ***CT pulmonary angiogram*** - This is the **gold standard** initial imaging investigation for confirming a suspected **pulmonary embolism (PE)**, especially in a clinically high-risk patient with recent immobility, postpartum state, and an elevated **D-dimer**. - CTPA rapidly provides definitive evidence by visualizing filling defects (**thrombi**) within the **pulmonary arteries**, which is necessary before initiating potentially curative but high-risk anticoagulation.*Chest X-ray* - While often performed initially to exclude other acute causes of chest pain and dyspnea (like **pneumothorax** or **pneumonia**), the CXR is typically normal or shows non-specific findings in PE. - CXR cannot definitively diagnose PE and should not delay the performance of advanced definitive imaging like CTPA when clinical suspicion is high.*ECG* - ECG helps exclude acute **myocardial infarction** and can reveal signs of acute right heart strain (e.g., **S1Q3T3 pattern** or new right bundle branch block), which may accompany PE. - It is an essential supportive test for evaluating the cardiac impact and risk stratification but is non-diagnostic for confirming the presence of an embolus.*V/Q scan* - A **ventilation-perfusion (V/Q) scan** is an alternative test, but it is typically reserved for patients who have an absolute contraindication to **iodinated contrast** (such as severe renal failure or prior anaphylactic reaction) required for the CTPA. - V/Q scan results are often indeterminate or low-probability in critically ill patients, whereas CTPA usually provides a clear diagnosis.*Echocardiogram* - Echocardiography is primarily used to assess for **right ventricular (RV) strain** or dysfunction (a sign of severe PE causing hemodynamic compromise) and for risk stratification. - While it may occasionally visualize large thrombi in the right heart (**thrombus in transit**), it lacks the sensitivity to detect smaller emboli in the peripheral pulmonary arteries and is not the primary diagnostic modality for PE.

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