A 42-year-old man is brought to the Emergency Department by ambulance following a witnessed collapse at a shopping centre. Bystanders initiated CPR immediately and an automated external defibrillator (AED) delivered two shocks before paramedics arrived. On arrival, he has return of spontaneous circulation (ROSC). He remains unconscious with GCS 5 (E1 V1 M3). His observations are: blood pressure 102/68 mmHg on noradrenaline infusion, heart rate 95 bpm, temperature 36.1°C, oxygen saturation 96% on mechanical ventilation. ECG shows sinus rhythm with 3 mm ST elevation in leads V2-V5. His wife reports no significant medical history but mentions his father died suddenly aged 45. After primary PCI is arranged, which additional intervention has the strongest evidence for improving neurological outcome?
Q142
A 71-year-old man with a background of severe aortic stenosis presents to the Emergency Department following an episode of collapse. He reports he was climbing stairs when he suddenly felt lightheaded and lost consciousness. He has been experiencing progressive exertional dyspnoea and chest tightness over the past 6 months. Examination reveals blood pressure 108/72 mmHg, heart rate 68 bpm regular, JVP elevated with prominent 'a' waves, grade 4/6 ejection systolic murmur at the right upper sternal edge radiating to carotids, and bibasal fine crackles. ECG shows sinus rhythm, left axis deviation, and left ventricular hypertrophy with strain pattern. An urgent transthoracic echocardiogram confirms severe aortic stenosis with aortic valve area of 0.7 cm² and mean gradient of 52 mmHg. What is the most appropriate definitive management?
Q143
A 34-year-old woman is brought to the Emergency Department after collapsing at a gym. Bystanders report she was on a treadmill when she suddenly clutched her chest and fell. On arrival, she is conscious but extremely distressed with severe chest pain. Her observations are: blood pressure 88/60 mmHg, heart rate 142 bpm, respiratory rate 32/min, oxygen saturation 89% on 15L oxygen. She has a past medical history of spontaneous pneumothorax at age 28. Physical examination reveals a tall, thin woman with long limbs and fingers, high-arched palate, pectus excavatum, and an early diastolic murmur. ECG shows sinus tachycardia. Chest X-ray demonstrates a widened mediastinum. What is the most likely underlying diagnosis?
Q144
A 58-year-old man is admitted to the Emergency Department with suspected severe sepsis secondary to biliary sepsis. He has a history of gallstones and presents with right upper quadrant pain, fever (39.4°C), jaundice, and confusion. His observations are: blood pressure 82/48 mmHg, heart rate 125 bpm, respiratory rate 26/min, oxygen saturation 92% on 15L oxygen via non-rebreathe mask. Blood tests show: lactate 4.2 mmol/L, bilirubin 156 µmol/L, ALT 345 U/L, white cell count 18.9 × 10⁹/L. He has received 2 litres of crystalloid fluid over 30 minutes, but his blood pressure remains 85/50 mmHg and lactate is 3.8 mmol/L. What is the most appropriate next step in his management?
Q145
A 44-year-old woman with acute myeloid leukaemia on chemotherapy presents to the Emergency Department with fever (38.9°C), rigors, and general malaise for 6 hours. She completed her last cycle of chemotherapy 10 days ago. Her observations are: blood pressure 102/65 mmHg, heart rate 108 bpm, respiratory rate 20/min, oxygen saturation 96% on room air. Blood tests show: white cell count 0.8 × 10⁹/L, neutrophils 0.2 × 10⁹/L, platelets 45 × 10⁹/L, C-reactive protein 85 mg/L. She has a Hickman line in situ with no evidence of infection at the site. According to current UK guidelines for neutropenic sepsis, what is the most appropriate antibiotic regimen?
Q146
A 76-year-old man is brought to the Emergency Department after collapsing at a restaurant. Witnesses report he stood up from his table, walked a few steps, then fell to the ground without warning. He regained consciousness within 30 seconds. He has a history of type 2 diabetes, hypertension, and ischaemic heart disease. His medications include metformin, ramipril, bisoprolol, aspirin, and atorvastatin. Examination reveals blood pressure 138/82 mmHg lying and 115/78 mmHg standing (after 3 minutes), heart rate 58 bpm regular, ejection systolic murmur loudest at the right upper sternal edge radiating to the carotids, and slow-rising pulse. ECG shows sinus rhythm with left ventricular hypertrophy. What is the most likely diagnosis?
Q147
A 61-year-old man presents to the Emergency Department with 6 hours of central chest pain. His ECG shows ST-segment elevation of 3 mm in leads II, III, and aVF, with reciprocal ST depression in leads I and aVL. He received aspirin 300 mg and ticagrelor 180 mg 30 minutes ago. His blood pressure is 102/68 mmHg, heart rate 58 bpm, and oxygen saturation 96% on room air. The nearest primary PCI centre is 90 minutes away. The local thrombolysis door-to-needle time is typically 20 minutes. What is the most appropriate immediate management strategy?
Q148
A 33-year-old healthcare worker develops sudden-onset facial flushing, generalized pruritus, and difficulty breathing 10 minutes into a surgical procedure under general anaesthesia. The anaesthetist notes rapidly developing facial and tongue swelling, bronchospasm, and hypotension (BP 78/45 mmHg, HR 135 bpm, SpO₂ 86% on 100% oxygen). The patient has received induction agents, rocuronium, and cefuroxime for prophylaxis. Emergency management includes 500 micrograms IM adrenaline, fluid resuscitation, and cardiorespiratory support. After stabilization, which investigation is most appropriate to identify the causative agent?
Q149
A 52-year-old woman presents to the Emergency Department with sudden-onset severe chest pain radiating to her back. The pain started 2 hours ago while lifting heavy boxes. She describes it as tearing in nature. She has a history of hypertension, currently managed with amlodipine. Her observations are: blood pressure 178/95 mmHg in the right arm and 142/88 mmHg in the left arm, heart rate 95 bpm, respiratory rate 20/min, oxygen saturation 97% on room air. Cardiovascular examination reveals an early diastolic murmur at the left sternal edge. ECG shows sinus rhythm with left ventricular hypertrophy but no acute ischaemic changes. What is the most appropriate initial investigation?
Q150
A 69-year-old man with chronic obstructive pulmonary disease presents to the Emergency Department with a 3-day history of worsening dyspnoea, productive cough with green sputum, and fever. His observations are: blood pressure 92/58 mmHg, heart rate 112 bpm, respiratory rate 28/min, oxygen saturation 88% on room air, temperature 38.7°C. Blood tests show: white cell count 16.2 × 10⁹/L, C-reactive protein 198 mg/L, lactate 2.8 mmol/L, creatinine 145 µmol/L (baseline 98 µmol/L). Chest X-ray confirms right lower lobe consolidation. You diagnose severe community-acquired pneumonia with sepsis. According to the Surviving Sepsis Campaign guidelines, within what timeframe should intravenous antibiotics ideally be administered?
Acute Medical Presentations UK Medical PG Practice Questions and MCQs
Question 141: A 42-year-old man is brought to the Emergency Department by ambulance following a witnessed collapse at a shopping centre. Bystanders initiated CPR immediately and an automated external defibrillator (AED) delivered two shocks before paramedics arrived. On arrival, he has return of spontaneous circulation (ROSC). He remains unconscious with GCS 5 (E1 V1 M3). His observations are: blood pressure 102/68 mmHg on noradrenaline infusion, heart rate 95 bpm, temperature 36.1°C, oxygen saturation 96% on mechanical ventilation. ECG shows sinus rhythm with 3 mm ST elevation in leads V2-V5. His wife reports no significant medical history but mentions his father died suddenly aged 45. After primary PCI is arranged, which additional intervention has the strongest evidence for improving neurological outcome?
A. Targeted temperature management at 32-36°C for 24 hours (Correct Answer)
B. Administration of intravenous thrombolysis
C. Administration of high-dose corticosteroids
D. Immediate decompressive craniotomy
E. Therapeutic hypothermia at 28-30°C for 48 hours
Explanation: ***Targeted temperature management at 32-36°C for 24 hours***- This remains a cornerstone of **post-cardiac arrest care** for comatose patients with **Return of Spontaneous Circulation (ROSC)** to mitigate reperfusion injury and improve **neurological survival**.- Current guidelines emphasize maintaining a constant target and, crucially, **avoiding fever** (>37.7°C) for at least 72 hours following the initial cooling period.*Administration of intravenous thrombolysis*- Thrombolysis is generally avoided when **Primary PCI** is available for **STEMI** and carries a high risk of internal bleeding following chest compressions during **CPR**.- It does not provide direct **neuroprotection** and is superseded by mechanical revascularization in this hemodynamically supported patient.*Administration of high-dose corticosteroids*- There is no high-quality evidence suggesting that **corticosteroids** improve neurological outcomes or survival in the post-cardiac arrest setting.- Steroids are not recommended in standard **ILCOR** or **AHA** post-resuscitation bundles and may increase the risk of **hyperglycemia** and infection.*Immediate decompressive craniotomy*- This is a surgical intervention for **intracranial hypertension** or brain herniation (e.g., in trauma or massive stroke), not a standard treatment for **hypoxic-ischemic encephalopathy**.- While cerebral edema occurs post-arrest, it is managed medically with **neuro-protective ventilation** and sedation rather than elective surgery.*Therapeutic hypothermia at 28-30°C for 48 hours*- Deep hypothermia (<32°C) is associated with significant complications, including **arrhythmias**, coagulopathy, and severe **electrolyte shifts**.- Clinical trials have demonstrated that cooling below the **32-36°C** range does not provide additional neurological benefit and may increase harm.
Question 142: A 71-year-old man with a background of severe aortic stenosis presents to the Emergency Department following an episode of collapse. He reports he was climbing stairs when he suddenly felt lightheaded and lost consciousness. He has been experiencing progressive exertional dyspnoea and chest tightness over the past 6 months. Examination reveals blood pressure 108/72 mmHg, heart rate 68 bpm regular, JVP elevated with prominent 'a' waves, grade 4/6 ejection systolic murmur at the right upper sternal edge radiating to carotids, and bibasal fine crackles. ECG shows sinus rhythm, left axis deviation, and left ventricular hypertrophy with strain pattern. An urgent transthoracic echocardiogram confirms severe aortic stenosis with aortic valve area of 0.7 cm² and mean gradient of 52 mmHg. What is the most appropriate definitive management?
A. Medical management with diuretics and beta-blockers
B. Urgent surgical aortic valve replacement (Correct Answer)
C. Percutaneous balloon aortic valvuloplasty
D. Transcatheter aortic valve implantation (TAVI)
E. Medical management with ACE inhibitors and monitoring
Explanation: ***Urgent surgical aortic valve replacement***
- This patient presents with the classic triad of **symptomatic severe aortic stenosis (AS)**: syncope, dyspnea, and angina; symptomatic AS has a high mortality rate and requires **definitive mechanical intervention**.
- In a 71-year-old patient who is otherwise functionally active, **Surgical Aortic Valve Replacement (SAVR)** is the standard of care to improve survival and quality of life.
*Medical management with diuretics and beta-blockers*
- Medical therapy does not address the **mechanical obstruction** and fails to alter the poor prognosis of symptomatic severe AS.
- **Beta-blockers** can be dangerous in severe AS as they reduce heart rate and cardiac output, potentially exacerbating symptoms in a patient who is already **preload and afterload dependent**.
*Percutaneous balloon aortic valvuloplasty*
- This procedure is generally reserved as a **palliative measure** or a temporary "bridge" to surgery because of the very high rate of **restenosis** within 6-12 months.
- It is not considered **definitive management** for a patient who is otherwise a candidate for valve replacement.
*Transcatheter aortic valve implantation (TAVI)*
- TAVI is typically reserved for patients at **high or prohibitive surgical risk** or those generally older than 75-80 years, depending on local guidelines and the heart team's assessment.
- While increasing in use, it is not the default choice over **SAVR** for a 71-year-old fit patient unless specific surgical contraindications are present.
*Medical management with ACE inhibitors and monitoring*
- **ACE inhibitors** must be used with extreme caution in severe AS as they can cause a sudden drop in **systemic vascular resistance**, leading to profound hypotension and syncope.
- Periodic monitoring is only appropriate for **asymptomatic** patients; once symptoms like syncope occur, intervention must be prioritized to prevent **sudden cardiac death**.
Question 143: A 34-year-old woman is brought to the Emergency Department after collapsing at a gym. Bystanders report she was on a treadmill when she suddenly clutched her chest and fell. On arrival, she is conscious but extremely distressed with severe chest pain. Her observations are: blood pressure 88/60 mmHg, heart rate 142 bpm, respiratory rate 32/min, oxygen saturation 89% on 15L oxygen. She has a past medical history of spontaneous pneumothorax at age 28. Physical examination reveals a tall, thin woman with long limbs and fingers, high-arched palate, pectus excavatum, and an early diastolic murmur. ECG shows sinus tachycardia. Chest X-ray demonstrates a widened mediastinum. What is the most likely underlying diagnosis?
A. Marfan syndrome with acute aortic dissection (Correct Answer)
B. Ehlers-Danlos syndrome type IV with spontaneous arterial rupture
C. Loeys-Dietz syndrome with aortic aneurysm
D. Hypertrophic cardiomyopathy with acute coronary syndrome
E. Pulmonary embolism in tall stature individual
Explanation: ***Marfan syndrome with acute aortic dissection***- The patient exhibits classic physical findings of **Marfan syndrome**, including **arachnodactyly** (long fingers), **dolichostenomelia** (long limbs), **pectus excavatum**, and a **high-arched palate**.- Sudden severe chest pain, **hypotension**, a **widened mediastinum** on X-ray, and an **early diastolic murmur** (indicating aortic regurgitation) are pathognomonic for **acute Type A aortic dissection**.*Ehlers-Danlos syndrome type IV with spontaneous arterial rupture*- While **Vascular Ehlers-Danlos (vEDS)** causes arterial rupture and pneumothorax, it typically presents with **thin, translucent skin**, easy bruising, and characteristic facial features rather than the **Marfanoid habitus** seen here.- The habitus described (**pectus excavatum**, tall stature) specifically points toward a defect in the **FBN1 gene** (fibrillin-1) rather than collagen type III.*Loeys-Dietz syndrome with aortic aneurysm*- **Loeys-Dietz syndrome** also involves aggressive aortic aneurysms, but is characterized by unique features such as **hypertelorism** (wide-set eyes), **bifid uvula**, and arterial tortuosity.- The skeletal stigmata described in this case are much more specific for the **Marfan syndrome** phenotype.*Hypertrophic cardiomyopathy with acute coronary syndrome*- While **Hypertrophic cardiomyopathy (HCM)** causes sudden collapse in young athletes, it does not explain the **widened mediastinum** or the systemic connective tissue signs.- An **early diastolic murmur** is consistent with **aortic regurgitation** from a dissection, whereas HCM typically presents with a **systolic ejection murmur** that increases with Valsalva.*Pulmonary embolism in tall stature individual*- Although tall individuals have a risk for **spontaneous pneumothorax**, and severe **Pulmonary Embolism (PE)** can cause collapse/hypotension, it does not cause a **widened mediastinum**.- The presence of the **diastolic murmur** and the high-arched palate directs the diagnosis toward an **aortic root pathology** rather than an obstructive pulmonary vascular event.
Question 144: A 58-year-old man is admitted to the Emergency Department with suspected severe sepsis secondary to biliary sepsis. He has a history of gallstones and presents with right upper quadrant pain, fever (39.4°C), jaundice, and confusion. His observations are: blood pressure 82/48 mmHg, heart rate 125 bpm, respiratory rate 26/min, oxygen saturation 92% on 15L oxygen via non-rebreathe mask. Blood tests show: lactate 4.2 mmol/L, bilirubin 156 µmol/L, ALT 345 U/L, white cell count 18.9 × 10⁹/L. He has received 2 litres of crystalloid fluid over 30 minutes, but his blood pressure remains 85/50 mmHg and lactate is 3.8 mmol/L. What is the most appropriate next step in his management?
A. Administer further 1 litre crystalloid bolus
B. Commence noradrenaline infusion targeting mean arterial pressure ≥65 mmHg (Correct Answer)
C. Arrange urgent ERCP within 2 hours
D. Commence dobutamine infusion
E. Administer hydrocortisone 50 mg IV
Explanation: ***Commence noradrenaline infusion targeting mean arterial pressure ≥65 mmHg***- The patient is in **septic shock**, evidenced by persistent **hypotension** (BP 85/50 mmHg) and elevated **lactate** (3.8 mmol/L) despite initial fluid resuscitation.- **Noradrenaline** is the first-line **vasopressor** recommended to increase **mean arterial pressure** and improve **organ perfusion** in fluid-refractory septic shock.*Administer further 1 litre crystalloid bolus*- The patient has already received 2 litres of crystalloids with no significant improvement, indicating **fluid unresponsiveness** in septic shock.- Further aggressive fluid administration risks **fluid overload** and **pulmonary oedema** without adequately addressing the underlying **vasodilation**.*Arrange urgent ERCP within 2 hours*- While **ERCP** is essential for **source control** in biliary sepsis, the patient's severe **hemodynamic instability** (septic shock) requires immediate stabilization.- Prioritizing **vasopressor support** is crucial to restore perfusion and prevent irreversible **organ damage** before an invasive procedure can be safely undertaken.*Commence dobutamine infusion*- **Dobutamine** is an **inotrope** primarily used for conditions with myocardial dysfunction or persistent hypoperfusion despite adequate mean arterial pressure.- It is not the first-line agent for the profound **vasodilation** characteristic of distributive septic shock and may worsen hypotension if used alone.*Administer hydrocortisone 50 mg IV*- **Corticosteroids** like hydrocortisone are reserved for **refractory septic shock**, where hypotension persists despite adequate fluid resuscitation AND **vasopressor therapy**.- At this stage, the patient has not yet received first-line **vasopressor therapy**, making the administration of hydrocortisone premature.
Question 145: A 44-year-old woman with acute myeloid leukaemia on chemotherapy presents to the Emergency Department with fever (38.9°C), rigors, and general malaise for 6 hours. She completed her last cycle of chemotherapy 10 days ago. Her observations are: blood pressure 102/65 mmHg, heart rate 108 bpm, respiratory rate 20/min, oxygen saturation 96% on room air. Blood tests show: white cell count 0.8 × 10⁹/L, neutrophils 0.2 × 10⁹/L, platelets 45 × 10⁹/L, C-reactive protein 85 mg/L. She has a Hickman line in situ with no evidence of infection at the site. According to current UK guidelines for neutropenic sepsis, what is the most appropriate antibiotic regimen?
A. Intravenous piperacillin-tazobactam monotherapy (Correct Answer)
B. Intravenous co-amoxiclav plus gentamicin
C. Intravenous meropenem plus vancomycin
D. Oral co-amoxiclav
E. Intravenous ceftriaxone plus metronidazole
Explanation: ***Intravenous piperacillin-tazobactam monotherapy***
- This patient presents with **neutropenic sepsis** (fever 38.9°C and neutrophil count 0.2 × 10⁹/L), a life-threatening emergency requiring urgent **broad-spectrum intravenous antibiotics**.
- **Piperacillin-tazobactam** is the recommended first-line empirical monotherapy in UK guidelines for neutropenic sepsis, providing excellent coverage, including against **Pseudomonas aeruginosa**.
*Intravenous co-amoxiclav plus gentamicin*
- This combination is not considered the optimal first-line empirical regimen for **high-risk neutropenic sepsis** due to varying effectiveness and potential for delayed broad-spectrum cover.
- While **gentamicin** is active against Gram-negatives, **co-amoxiclav** alone does not provide sufficient reliable **anti-pseudomonal activity** for neutropenic patients.
*Intravenous meropenem plus vancomycin*
- **Meropenem**, a carbapenem, is generally reserved for patients with severe sepsis/septic shock, known **ESBL-producing** organisms, or those who have failed first-line therapy.
- **Vancomycin** is usually added only if there is a high suspicion of **MRSA**, severe skin/soft tissue infection, or a **catheter-related bloodstream infection**, none of which are explicitly indicated here.
*Oral co-amoxiclav*
- Oral antibiotics are only appropriate for **low-risk** patients with neutropenic fever who are hemodynamically stable and have no signs of severe infection or septic shock.
- This patient's **fever, rigors, and tachycardia** indicate a high-risk presentation requiring immediate **intravenous antibiotic therapy**.
*Intravenous ceftriaxone plus metronidazole*
- **Ceftriaxone** does not provide adequate or reliable empirical coverage for **Pseudomonas aeruginosa**, a crucial pathogen to cover in neutropenic patients.
- **Metronidazole** is for anaerobic coverage and is not typically indicated empirically unless there is a specific suspected source of **anaerobic infection**, such as an intra-abdominal process.
Question 146: A 76-year-old man is brought to the Emergency Department after collapsing at a restaurant. Witnesses report he stood up from his table, walked a few steps, then fell to the ground without warning. He regained consciousness within 30 seconds. He has a history of type 2 diabetes, hypertension, and ischaemic heart disease. His medications include metformin, ramipril, bisoprolol, aspirin, and atorvastatin. Examination reveals blood pressure 138/82 mmHg lying and 115/78 mmHg standing (after 3 minutes), heart rate 58 bpm regular, ejection systolic murmur loudest at the right upper sternal edge radiating to the carotids, and slow-rising pulse. ECG shows sinus rhythm with left ventricular hypertrophy. What is the most likely diagnosis?
A. Vasovagal syncope
B. Cardiac syncope secondary to aortic stenosis (Correct Answer)
C. Postural hypotension
D. Cardiac syncope secondary to bradyarrhythmia
E. Carotid sinus hypersensitivity
Explanation: ***Cardiac syncope secondary to aortic stenosis***
- The patient's presentation with **exertional syncope**, a characteristic **ejection systolic murmur** radiating to the carotids, and a **slow-rising pulse** are the classic features of **aortic stenosis**.
- **Left ventricular hypertrophy** on ECG further supports chronic pressure overload associated with severe AS, where the fixed cardiac output cannot meet increased systemic demand during activity, leading to transient **cerebral hypoperfusion**.
*Vasovagal syncope*
- This typically involves a **prodrome** (e.g., nausea, sweating, pallor) and specific triggers like emotional stress or prolonged standing, which are not explicitly present here.
- The **sudden, unwarned collapse** combined with strong signs of valvular heart disease makes vasovagal syncope less likely.
*Postural hypotension*
- While the patient had a 23 mmHg systolic drop, this degree of change is not severe enough to solely explain the collapse, especially as it occurred after walking rather than immediately upon standing.
- The dominant clinical findings of a **loud cardiac murmur** and **slow-rising pulse** point away from simple postural hypotension as the primary cause.
*Cardiac syncope secondary to bradyarrhythmia*
- Although the patient has bradycardia (58 bpm) potentially due to bisoprolol, the ECG shows **sinus rhythm**, and the primary clinical picture is dominated by clear signs of **aortic stenosis**.
- Syncope in this context is primarily due to the fixed stroke volume of AS, rather than a severe bradyarrhythmia.
*Carotid sinus hypersensitivity*
- This condition is usually provoked by mechanical stimulation of the carotid sinus, such as **shaving** or wearing a **tight collar**, none of which were reported as triggers.
- It does not account for the classic auscultatory and pulse findings highly suggestive of **aortic stenosis**.
Question 147: A 61-year-old man presents to the Emergency Department with 6 hours of central chest pain. His ECG shows ST-segment elevation of 3 mm in leads II, III, and aVF, with reciprocal ST depression in leads I and aVL. He received aspirin 300 mg and ticagrelor 180 mg 30 minutes ago. His blood pressure is 102/68 mmHg, heart rate 58 bpm, and oxygen saturation 96% on room air. The nearest primary PCI centre is 90 minutes away. The local thrombolysis door-to-needle time is typically 20 minutes. What is the most appropriate immediate management strategy?
A. Arrange immediate transfer for primary percutaneous coronary intervention (Correct Answer)
B. Administer thrombolysis immediately
C. Arrange urgent inpatient coronary angiography within 24 hours
D. Administer thrombolysis then transfer for coronary angiography
E. Observe with repeat ECG and troponins in 6 hours
Explanation: ***Arrange immediate transfer for primary percutaneous coronary intervention***
- For an acute **ST-segment elevation myocardial infarction (STEMI)**, primary PCI is the preferred reperfusion strategy if it can be performed within **120 minutes** of the time thrombolysis could have been initiated.
- In this case, the time difference for PCI compared to thrombolysis (90 minutes transfer for PCI - 20 minutes door-to-needle for thrombolysis = **70 minutes**) is well within the **120-minute window**, making primary PCI the superior choice for reducing mortality and morbidity.
*Administer thrombolysis immediately*
- **Thrombolysis** is primarily indicated when primary PCI cannot be delivered within the recommended **120-minute time frame** from diagnosis or first medical contact.
- While quickly achievable, it carries a higher risk of **intracranial haemorrhage** and is less effective in achieving complete reperfusion compared to PCI when PCI is accessible within the time limits.
*Arrange urgent inpatient coronary angiography within 24 hours*
- Urgent inpatient coronary angiography within 24 hours is the standard management for **Non-ST-segment elevation myocardial infarction (NSTEMI)** or unstable angina, not for **STEMI**.
- **STEMI** necessitates immediate reperfusion to salvage viable myocardium, and a 24-hour delay would lead to significant and irreversible myocardial damage.
*Administer thrombolysis then transfer for coronary angiography*
- This **pharmacoinvasive strategy** is typically employed when primary PCI is not immediately available within the 120-minute window, so thrombolysis is given as a bridge.
- Since primary PCI can be performed within the guideline-recommended timeframe, administering thrombolysis first unnecessarily exposes the patient to the risks of **bleeding** without the superior benefits of immediate PCI.
*Observe with repeat ECG and troponins in 6 hours*
- Observing a patient with clear **STEMI** and significant reciprocal changes on ECG is an inappropriate and harmful management strategy.
- Delaying **reperfusion therapy** would lead to extensive **myocardial necrosis**, increased infarct size, and significantly higher risks of complications and mortality.
Question 148: A 33-year-old healthcare worker develops sudden-onset facial flushing, generalized pruritus, and difficulty breathing 10 minutes into a surgical procedure under general anaesthesia. The anaesthetist notes rapidly developing facial and tongue swelling, bronchospasm, and hypotension (BP 78/45 mmHg, HR 135 bpm, SpO₂ 86% on 100% oxygen). The patient has received induction agents, rocuronium, and cefuroxime for prophylaxis. Emergency management includes 500 micrograms IM adrenaline, fluid resuscitation, and cardiorespiratory support. After stabilization, which investigation is most appropriate to identify the causative agent?
A. Serum mast cell tryptase levels at 1-2 hours post-reaction (Correct Answer)
B. Skin prick testing immediately after stabilization
C. Serum total IgE level
D. Serum specific IgE to all administered drugs
E. Serum histamine level at 12 hours post-reaction
Explanation: ***Serum mast cell tryptase levels at 1-2 hours post-reaction*** - **Serum mast cell tryptase** is the most reliable biomarker to confirm **anaphylaxis**, as its levels typically peak between **1 and 2 hours** after the onset of symptoms. - A significant rise in tryptase from a baseline (taken at least 24 hours later) confirms that the clinical event was mediated by **mast cell degranulation**. *Skin prick testing immediately after stabilization* - **Immediate skin prick testing** is not advisable as it can lead to **false-negative results** due to temporary depletion of mast cell mediators after a severe systemic reaction. - This type of testing should ideally be deferred for **4–6 weeks** post-anaphylaxis to allow for mast cell recovery and ensure accurate results. *Serum total IgE level* - **Total IgE** levels indicate a patient's overall allergic predisposition but do not pinpoint the **specific acute causative agent** of an anaphylactic reaction. - Elevated total IgE levels are common in various **atopic conditions** but do not confirm a diagnosis of acute anaphylaxis. *Serum specific IgE to all administered drugs* - While **specific IgE (sIgE)** tests can identify certain drug allergies (e.g., to **rocuronium** or **cefuroxime**), they are not the primary acute investigation for anaphylaxis. - sIgE testing may not be available for all relevant anesthetic agents and is best performed by an **allergy specialist** several weeks after the acute event, often alongside skin tests. *Serum histamine level at 12 hours post-reaction* - **Serum histamine** has an extremely **short half-life**, usually returning to baseline within **30-60 minutes** of its release. - Measuring histamine levels at **12 hours** post-reaction would be clinically unhelpful as the substance would have been metabolized and cleared from the circulation long before.
Question 149: A 52-year-old woman presents to the Emergency Department with sudden-onset severe chest pain radiating to her back. The pain started 2 hours ago while lifting heavy boxes. She describes it as tearing in nature. She has a history of hypertension, currently managed with amlodipine. Her observations are: blood pressure 178/95 mmHg in the right arm and 142/88 mmHg in the left arm, heart rate 95 bpm, respiratory rate 20/min, oxygen saturation 97% on room air. Cardiovascular examination reveals an early diastolic murmur at the left sternal edge. ECG shows sinus rhythm with left ventricular hypertrophy but no acute ischaemic changes. What is the most appropriate initial investigation?
A. Transthoracic echocardiography
B. CT pulmonary angiography
C. CT aortography with intravenous contrast (Correct Answer)
D. Chest X-ray
E. Troponin measurement
Explanation: ***CT aortography with intravenous contrast***- This patient presents with classic signs of **acute aortic dissection**, including **tearing chest pain**, a significant **blood pressure differential** (>20 mmHg) between arms, and an **early diastolic murmur** (suggesting aortic regurgitation).- **CT aortography** is the gold-standard initial investigation in hemodynamically stable patients due to its high sensitivity and specificity for identifying the **intimal flap** and the extent of the dissection.*Transthoracic echocardiography*- While useful for detecting **aortic regurgitation** or **pericardial effusion**, it has low sensitivity for visualizing the distal ascending, arch, or descending aorta.- **Transesophageal echocardiography (TEE)** is significantly more accurate than the transthoracic approach but is more invasive and may require sedation.*CT pulmonary angiography*- This is the diagnostic test of choice for **pulmonary embolism**, which often presents with pleuritic chest pain and shortness of breath rather than tearing pain radiating to the back.- It uses a different **contrast bolus timing** than an aortogram, which may fail to provide adequate opacification to diagnose a dissection.*Chest X-ray*- Although it may show a **widened mediastinum** or a "calcium sign," a normal chest X-ray cannot rule out an aortic dissection.- It is a screening tool that lacks the necessary **sensitivity and specificity** to guide surgical or medical management in a suspected emergency.*Troponin measurement*- While troponin may be elevated due to **myocardial stress** or extension of the dissection into the coronary arteries, it is not a diagnostic test for dissection.- Relying on troponin can cause dangerous delays in diagnosing a surgical emergency like a **Stanford Type A** dissection.
Question 150: A 69-year-old man with chronic obstructive pulmonary disease presents to the Emergency Department with a 3-day history of worsening dyspnoea, productive cough with green sputum, and fever. His observations are: blood pressure 92/58 mmHg, heart rate 112 bpm, respiratory rate 28/min, oxygen saturation 88% on room air, temperature 38.7°C. Blood tests show: white cell count 16.2 × 10⁹/L, C-reactive protein 198 mg/L, lactate 2.8 mmol/L, creatinine 145 µmol/L (baseline 98 µmol/L). Chest X-ray confirms right lower lobe consolidation. You diagnose severe community-acquired pneumonia with sepsis. According to the Surviving Sepsis Campaign guidelines, within what timeframe should intravenous antibiotics ideally be administered?
A. Within 6 hours of diagnosis
B. Within 30 minutes of diagnosis
C. Within 1 hour of diagnosis (Correct Answer)
D. Within 3 hours of diagnosis
E. After blood cultures have been obtained regardless of time
Explanation: ***Within 1 hour of diagnosis***
- The **Surviving Sepsis Campaign** guidelines recommend that intravenous antimicrobials be initiated within **1 hour** of recognition (the "golden hour") for patients with sepsis or septic shock.
- Delays in antibiotic administration are strongly associated with increased **mortality** and progression to **organ failure**.
*Within 6 hours of diagnosis*
- Waiting **6 hours** is far beyond the recommended window and is associated with a significantly higher risk of **septic shock** and death.
- This timeframe was previously associated with completing certain hemodynamic goals, but never for the initial **antibiotic dose**.
*Within 30 minutes of diagnosis*
- While ultra-rapid administration is ideal, the **standardized guideline** threshold established for bundle compliance is within the **first hour**.
- Achieving a 30-minute target is often logistically difficult in an **Emergency Department** setting and is not the formal required metric.
*Within 3 hours of diagnosis*
- The **3-hour bundle** was used in older guidelines; however, the updated **1-hour bundle** now mandates even earlier intervention for sepsis recognition.
- For patients with **possible sepsis** without shock, 3 hours may be considered for investigation, but this patient has **sepsis signs** (hypotension, lactate >2) requiring **immediate action**.
*After blood cultures have been obtained regardless of time*
- While **blood cultures** should ideally be collected before antibiotics, they must not **delay therapy**; guidelines state antibiotics should proceed if cultures cannot be obtained within **45 minutes**.
- Prioritizing cultures "regardless of time" is dangerous, as **prompt antimicrobial therapy** is the most critical intervention for **survival**.
