A 70-year-old man with known ischaemic heart disease and previous inferior myocardial infarction presents with 90 minutes of severe central chest pain. His ECG shows ST-segment elevation in leads V1-V4 consistent with anterior STEMI. He is haemodynamically stable with blood pressure 135/85 mmHg, heart rate 88 bpm, oxygen saturation 97% on room air. He is given aspirin 300 mg, ticagrelor 180 mg, and intravenous morphine. Primary PCI is arranged and will be performed within 60 minutes. According to current evidence-based guidelines, what is the role of routine pre-treatment with glycoprotein IIb/IIIa inhibitors in this patient before primary PCI?
Q112
A 52-year-old woman presents to the Emergency Department with 6 hours of central chest pain associated with nausea and sweating. Her ECG shows ST-segment elevation of 2.5 mm in leads II, III, and aVF, with ST-segment depression in leads I and aVL. She has been given aspirin 300 mg, ticagrelor 180 mg, and morphine 10 mg. Primary PCI is planned but the catheterization laboratory is not available for 45 minutes. While waiting, she develops bradycardia with a heart rate of 45 bpm and blood pressure drops to 85/50 mmHg. She feels light-headed. Cardiac monitoring shows second-degree atrioventricular block Mobitz type II with a PR interval that is constant before dropped beats. Given the clinical context and ECG findings, which coronary artery is most likely to be occluded?
Q113
A 48-year-old man with end-stage renal failure on haemodialysis presents to the Emergency Department with a 24-hour history of fever, rigors, and feeling generally unwell. His last dialysis session was 2 days ago via his tunnelled central venous catheter. On examination, temperature is 38.8°C, heart rate 115 bpm, blood pressure 105/70 mmHg, respiratory rate 22 breaths per minute. There is erythema and tenderness around the catheter exit site. Blood tests reveal: white cell count 16.2 × 10⁹/L, neutrophils 14.1 × 10⁹/L, CRP 185 mg/L, lactate 2.8 mmol/L. You diagnose catheter-related bloodstream infection with sepsis. Which additional investigation finding would most strongly support removing the dialysis catheter rather than attempting antibiotic salvage?
Q114
A 35-year-old woman is brought to the Emergency Department after collapsing at a gym. Bystanders report she complained of palpitations and light-headedness before losing consciousness for approximately 30 seconds. She has a family history of sudden cardiac death (her brother died aged 28 during sleep). On examination, she is alert, blood pressure 125/80 mmHg, heart rate 75 bpm regular. Her ECG shows sinus rhythm with a QTc of 485 milliseconds (normal <460 ms in women). During her observation in the Emergency Department, she has another syncopal episode. Continuous cardiac monitoring during this event shows polymorphic ventricular tachycardia with a distinctive pattern of QRS complexes that twist around the baseline. What is the most appropriate immediate pharmacological management for the observed arrhythmia?
Q115
A 42-year-old previously healthy man collapses at work. A colleague witnesses him suddenly become unresponsive and begin convulsing. The episode lasts approximately 90 seconds. When the ambulance arrives 8 minutes later, he is drowsy but responding to commands. His blood glucose is 5.8 mmol/L. In the Emergency Department, he is alert but has no memory of the event. Examination reveals a heart rate of 68 bpm regular, blood pressure 128/75 mmHg, and a loud ejection systolic murmur best heard at the lower left sternal edge that increases with Valsalva manoeuvre. His ECG shows sinus rhythm with deep Q waves and left ventricular hypertrophy in the lateral leads. What is the most likely underlying diagnosis?
Q116
A 79-year-old woman with metastatic pancreatic cancer presents to the Emergency Department with a 36-hour history of rigors, confusion, and reduced urine output. She has a Hickman line in situ for chemotherapy. On examination, temperature is 39.2°C, heart rate 125 bpm, blood pressure 85/55 mmHg, respiratory rate 26 breaths per minute, oxygen saturation 93% on room air, and Glasgow Coma Scale score 13 (E3 V4 M6). Blood tests show: white cell count 2.1 × 10⁹/L, neutrophils 0.4 × 10⁹/L, lactate 4.5 mmol/L, creatinine 185 μmol/L (baseline 75 μmol/L). What is the most appropriate initial empirical antimicrobial regimen?
Q117
A 58-year-old man with known ischaemic heart disease presents with 3 hours of central crushing chest pain. His initial ECG shows 2 mm ST-segment elevation in leads V1-V4. He is given aspirin 300 mg, ticagrelor 180 mg, and morphine 5 mg intravenously. Primary percutaneous coronary intervention (PCI) is planned. Twenty minutes after arrival, he suddenly becomes unresponsive. The cardiac monitor shows a regular broad complex tachycardia at 180 bpm. He has no palpable pulse. What is the most appropriate immediate management?
Q118
A 28-year-old woman is brought to the Emergency Department following a wasp sting 25 minutes ago. She has developed facial swelling, generalized urticaria, and difficulty breathing. She is treated with intramuscular adrenaline 500 micrograms, intravenous chlorphenamine 10 mg, and intravenous hydrocortisone 200 mg. Her initial blood pressure is 80/50 mmHg but improves to 100/65 mmHg after the first dose of adrenaline and 500 mL intravenous fluid bolus. She continues to have wheeze and appears anxious. What is the minimum duration this patient should be observed in hospital following initial improvement of her symptoms?
Q119
A 75-year-old woman with severe aortic stenosis presents after a syncopal episode while walking up stairs. She reports three similar episodes over the past month, all occurring during exertion. She denies chest pain but describes progressive dyspnoea on exertion over six months. Examination reveals a slow-rising pulse, blood pressure 110/70 mmHg, and an ejection systolic murmur loudest at the right upper sternal edge radiating to the carotids. Her ECG shows sinus rhythm with left ventricular hypertrophy. What is the most important immediate investigation to guide acute management?
Q120
A 62-year-old man with hypertension and type 2 diabetes presents with 8 hours of central chest discomfort described as 'heaviness'. His ECG shows sinus rhythm with T wave inversion in leads V2-V4. High-sensitivity troponin I measured at presentation is 250 ng/L (normal <16 ng/L). He is haemodynamically stable with blood pressure 135/85 mmHg, heart rate 75 bpm, oxygen saturation 98% on room air. His GRACE score is calculated as 145. According to current guidelines, what is the most appropriate timeframe for invasive coronary angiography in this patient?
Acute Medical Presentations UK Medical PG Practice Questions and MCQs
Question 111: A 70-year-old man with known ischaemic heart disease and previous inferior myocardial infarction presents with 90 minutes of severe central chest pain. His ECG shows ST-segment elevation in leads V1-V4 consistent with anterior STEMI. He is haemodynamically stable with blood pressure 135/85 mmHg, heart rate 88 bpm, oxygen saturation 97% on room air. He is given aspirin 300 mg, ticagrelor 180 mg, and intravenous morphine. Primary PCI is arranged and will be performed within 60 minutes. According to current evidence-based guidelines, what is the role of routine pre-treatment with glycoprotein IIb/IIIa inhibitors in this patient before primary PCI?
A. Should be given routinely to all STEMI patients before primary PCI
B. Should be given only if there is evidence of large thrombus burden on angiography (Correct Answer)
C. Should be given only if the patient has diabetes mellitus
D. Should be given only if symptom onset was more than 12 hours ago
E. Should be given only if the patient did not receive dual antiplatelet therapy
Explanation: ***Should be given only if there is evidence of large thrombus burden on angiography***
- Routine pre-treatment with **GP IIb/IIIa inhibitors** is generally not recommended in STEMI patients receiving modern **P2Y12 inhibitors** (like ticagrelor) due to increased **bleeding risk** without significant mortality benefit.
- These agents are primarily reserved for **bailout therapy** during primary PCI in specific situations such as documented **large thrombus burden**, slow-reflow, or other procedural thrombotic complications.
*Should be given routinely to all STEMI patients before primary PCI*
- Current guidelines, supported by trials like **FINESSE**, do not recommend routine upstream administration of **GP IIb/IIIa inhibitors** due to an increased risk of **major bleeding** without improving clinical outcomes.
- The focus is on early and potent **dual antiplatelet therapy (DAPT)** with aspirin and a P2Y12 inhibitor as the standard of care.
*Should be given only if the patient has diabetes mellitus*
- While **diabetes mellitus** is a significant risk factor for cardiovascular disease and adverse outcomes in STEMI, it is not an independent indication for routine pre-treatment with **GP IIb/IIIa inhibitors**.
- The decision for **GP IIb/IIIa inhibitor** use is based on angiographic findings and procedural considerations, not solely on comorbidities like diabetes.
*Should be given only if symptom onset was more than 12 hours ago*
- The primary window for **primary PCI** to achieve optimal reperfusion is typically within 12 hours of symptom onset; beyond this, the benefits diminish unless there's ongoing ischemia or hemodynamic instability.
- The timing of symptom onset does not directly dictate the need for **GP IIb/IIIa inhibitors**, which are used for acute thrombus management during the PCI procedure itself.
*Should be given only if the patient did not receive dual antiplatelet therapy*
- The patient in the scenario has already received **aspirin** and **ticagrelor**, which constitutes appropriate **dual antiplatelet therapy (DAPT)**.
- Even if DAPT was not administered, routine **GP IIb/IIIa inhibitor** use is not standard; selective use based on **coronary angiography findings** remains the prevailing guideline.
Question 112: A 52-year-old woman presents to the Emergency Department with 6 hours of central chest pain associated with nausea and sweating. Her ECG shows ST-segment elevation of 2.5 mm in leads II, III, and aVF, with ST-segment depression in leads I and aVL. She has been given aspirin 300 mg, ticagrelor 180 mg, and morphine 10 mg. Primary PCI is planned but the catheterization laboratory is not available for 45 minutes. While waiting, she develops bradycardia with a heart rate of 45 bpm and blood pressure drops to 85/50 mmHg. She feels light-headed. Cardiac monitoring shows second-degree atrioventricular block Mobitz type II with a PR interval that is constant before dropped beats. Given the clinical context and ECG findings, which coronary artery is most likely to be occluded?
A. Left anterior descending artery
B. Left circumflex artery
C. Right coronary artery (Correct Answer)
D. Left main stem artery
E. Obtuse marginal branch
Explanation: ***Right coronary artery***- The right coronary artery (RCA) supplies the **inferior wall** of the heart; occlusion typically results in ST-elevation in leads **II, III, and aVF** with reciprocal changes in I and aVL.- The RCA also supplies the **AV node** in 85-90% of individuals, making its occlusion the most likely cause of **bradycardia**, hypotension, and high-grade **atrioventricular blocks** during an inferior STEMI.*Left anterior descending artery*- Occlusion of this artery typically leads to an **anterior STEMI**, characterized by ST-elevation in leads **V1 to V4**.- It supplies the **interventricular septum** and the anterior wall, and its occlusion usually results in different conduction disturbances like **Right Bundle Branch Block**.*Left circumflex artery*- The LCx usually supplies the **lateral wall** of the left ventricle, leading to ST-elevation in leads **I, aVL, V5, and V6**.- While it can supply the inferior wall in **left-dominant systems** (10-15% of the population), the RCA remains the more common culprit for classic inferior STEMIs with AV block.*Left main stem artery*- Occlusion often presents with **widespread ST-depression** in multiple leads and significant **ST-elevation in lead aVR**.- This is a critical, life-threatening condition that typically causes **profound cardiogenic shock** and extensive anterior/lateral wall ischemia rather than isolated inferior changes.*Obtuse marginal branch*- This is a branch of the **Left Circumflex artery** and primarily supplies the **lateral wall** of the left ventricle.- Occlusion would lead to lateral ST changes and is not typically associated with **AV node dysfunction** or inferior leads II, III, and aVF.
Question 113: A 48-year-old man with end-stage renal failure on haemodialysis presents to the Emergency Department with a 24-hour history of fever, rigors, and feeling generally unwell. His last dialysis session was 2 days ago via his tunnelled central venous catheter. On examination, temperature is 38.8°C, heart rate 115 bpm, blood pressure 105/70 mmHg, respiratory rate 22 breaths per minute. There is erythema and tenderness around the catheter exit site. Blood tests reveal: white cell count 16.2 × 10⁹/L, neutrophils 14.1 × 10⁹/L, CRP 185 mg/L, lactate 2.8 mmol/L. You diagnose catheter-related bloodstream infection with sepsis. Which additional investigation finding would most strongly support removing the dialysis catheter rather than attempting antibiotic salvage?
A. Growth of coagulase-negative Staphylococcus from one peripheral blood culture bottle
B. Growth of Staphylococcus aureus from both peripheral and catheter blood cultures within 2 hours of each other
C. Growth of Escherichia coli from peripheral blood cultures after 18 hours of incubation
D. Growth of Candida species from a single peripheral blood culture after 48 hours (Correct Answer)
E. Persistently positive blood cultures after 72 hours of appropriate antibiotics with catheter in situ
Explanation: ***Growth of Candida species from a single peripheral blood culture after 48 hours***
- Isolation of **Candida species** is an absolute indication for immediate catheter removal because fungi form dense **biofilms** that are nearly impossible to eradicate with anti-fungal salvage therapy.
- Failure to remove the catheter in **candidemia** increases the risk of mortality and severe complications like **endocarditis** or **endophthalmitis**.
*Growth of coagulase-negative Staphylococcus from one peripheral blood culture bottle*
- A single culture positive for **coagulase-negative Staphylococcus** may represent **skin contamination** rather than a true catheter-related bloodstream infection.
- If confirmed as the pathogen, these organisms have lower virulence and are often candidates for **antibiotic lock therapy** if the patient is stable.
*Growth of Staphylococcus aureus from both peripheral and catheter blood cultures within 2 hours of each other*
- While **Staphylococcus aureus** often warrants catheter removal due to the risk of **metastatic infection**, it is sometimes managed with salvage if there are no complications.
- The short **differential time to positivity (DTP)** confirms the catheter as the source but doesn't mandate removal as urgently as fungal pathogens.
*Growth of Escherichia coli from peripheral blood cultures after 18 hours of incubation*
- Gram-negative bacilli like **Escherichia coli** are more likely to be cleared with **systemic antibiotics** alone compared to fungal or staphylococcal infections.
- Catheter salvage is often attempted for **Gram-negative** infections unless the patient remains hemodynamically unstable or septic.
*Persistently positive blood cultures after 72 hours of appropriate antibiotics with catheter in situ*
- This is indeed an indication for removal, but the initial detection of **fungaemia** (Candida) is a more immediate and definitive trigger for removal from the outset.
- This scenario describes a **failed salvage attempt**, whereas identifying specific pathogens like Candida dictates removal even before waiting 72 hours.
Question 114: A 35-year-old woman is brought to the Emergency Department after collapsing at a gym. Bystanders report she complained of palpitations and light-headedness before losing consciousness for approximately 30 seconds. She has a family history of sudden cardiac death (her brother died aged 28 during sleep). On examination, she is alert, blood pressure 125/80 mmHg, heart rate 75 bpm regular. Her ECG shows sinus rhythm with a QTc of 485 milliseconds (normal <460 ms in women). During her observation in the Emergency Department, she has another syncopal episode. Continuous cardiac monitoring during this event shows polymorphic ventricular tachycardia with a distinctive pattern of QRS complexes that twist around the baseline. What is the most appropriate immediate pharmacological management for the observed arrhythmia?
A. Intravenous magnesium sulphate 2 grams (Correct Answer)
B. Intravenous amiodarone 300 mg bolus
C. Intravenous adenosine 6 mg rapid bolus
D. Intravenous verapamil 5 mg
E. Intravenous lignocaine 100 mg bolus
Explanation: ***Intravenous magnesium sulphate 2 grams***
- This patient presents with **Torsades de Pointes (TdP)**, a form of polymorphic ventricular tachycardia associated with a **prolonged QTc interval** and a family history of **sudden cardiac death**.
- **Magnesium sulphate** is the first-line treatment for TdP as it stabilizes the cardiac membrane and is effective even in patients with normal serum magnesium levels.
*Intravenous amiodarone 300 mg bolus*
- Amiodarone is a Class III antiarrhythmic that **prolongs the QT interval**, which would exacerbate the underlying pathology and worsen **Torsades de Pointes**.
- It is contraindicated in patients with known long QT syndromes or polymorphic VT associated with QT prolongation.
*Intravenous adenosine 6 mg rapid bolus*
- Adenosine is used for the acute termination of **supraventricular tachycardias (SVT)** like AVNRT but has no role in managing ventricular arrhythmias.
- It acts by blocking the **AV node**, which does not address the triggered activity causing TdP in the ventricles.
*Intravenous verapamil 5 mg*
- Verapamil is a calcium channel blocker used for rate control in atrial arrhythmias or specific SVTs but is **contraindicated in ventricular tachycardia**.
- Administration in this setting can lead to profound **hypotension** and cardiovascular collapse.
*Intravenous lignocaine 100 mg bolus*
- While Lignocaine (Lidocaine) is a Class Ib antiarrhythmic used for monomorphic VT, it is **not first-line** for Torsades de Pointes.
- It is generally less effective than magnesium for this specific arrhythmia and may be considered only if first-line interventions fail.
Question 115: A 42-year-old previously healthy man collapses at work. A colleague witnesses him suddenly become unresponsive and begin convulsing. The episode lasts approximately 90 seconds. When the ambulance arrives 8 minutes later, he is drowsy but responding to commands. His blood glucose is 5.8 mmol/L. In the Emergency Department, he is alert but has no memory of the event. Examination reveals a heart rate of 68 bpm regular, blood pressure 128/75 mmHg, and a loud ejection systolic murmur best heard at the lower left sternal edge that increases with Valsalva manoeuvre. His ECG shows sinus rhythm with deep Q waves and left ventricular hypertrophy in the lateral leads. What is the most likely underlying diagnosis?
A. Hypertrophic obstructive cardiomyopathy (Correct Answer)
B. Aortic stenosis
C. Pulmonary stenosis
D. Brugada syndrome
E. Long QT syndrome
Explanation: ***Hypertrophic obstructive cardiomyopathy***
- The pathognomonic finding is an **ejection systolic murmur** that **increases with Valsalva**, as reduced preload and increased contractility worsen the left ventricular outflow tract obstruction.
- ECG features of **left ventricular hypertrophy** and **deep septal Q waves** in lateral leads, combined with **convulsive syncope** (syncope-induced seizure activity) in a young/middle-aged adult, strongly point toward this diagnosis.
*Aortic stenosis*
- The murmur of aortic stenosis is typically loudest at the **right upper sternal border** and usually **decreases in intensity during a Valsalva manoeuvre** due to decreased blood flow.
- While it can cause syncope and LVH, the characteristic murmur behavior with Valsalva and the relatively young age for severe symptomatic AS without other risk factors make it less likely.
*Pulmonary stenosis*
- This condition produces an ejection systolic murmur heard best at the **left upper sternal edge** (pulmonary area) and is associated with **right ventricular hypertrophy**, not left ventricular hypertrophy or deep Q waves in lateral leads.
- It generally does not cause syncope or ECG changes of LVH as seen in the patient's presentation.
*Brugada syndrome*
- This is a primary electrical disorder characterized by a specific **coved-type ST elevation** in leads V1-V3 on ECG, not lateral LVH or Q waves, and does not present with a cardiac murmur.
- Syncope in Brugada syndrome is due to ventricular arrhythmias, but the presence of a dynamic murmur is a key differentiator.
*Long QT syndrome*
- Diagnosis relies on a significantly **prolonged corrected QT interval (QTc)** on an ECG and is a primary electrical disorder.
- Like Brugada, it does not produce a **systolic murmur** or dynamic changes with the Valsalva manoeuvre, making it inconsistent with the physical examination findings.
Question 116: A 79-year-old woman with metastatic pancreatic cancer presents to the Emergency Department with a 36-hour history of rigors, confusion, and reduced urine output. She has a Hickman line in situ for chemotherapy. On examination, temperature is 39.2°C, heart rate 125 bpm, blood pressure 85/55 mmHg, respiratory rate 26 breaths per minute, oxygen saturation 93% on room air, and Glasgow Coma Scale score 13 (E3 V4 M6). Blood tests show: white cell count 2.1 × 10⁹/L, neutrophils 0.4 × 10⁹/L, lactate 4.5 mmol/L, creatinine 185 μmol/L (baseline 75 μmol/L). What is the most appropriate initial empirical antimicrobial regimen?
A. Piperacillin-tazobactam alone (Correct Answer)
B. Meropenem plus vancomycin
C. Ceftriaxone plus metronidazole
D. Amoxicillin plus gentamicin
E. Ciprofloxacin alone
Explanation: ***Piperacillin-tazobactam alone***
- This patient exhibits **neutropenic sepsis** (neutrophils <0.5 × 10⁹/L) and clear signs of **septic shock**, necessitating immediate empirical broad-spectrum monotherapy with an anti-pseudomonal beta-lactam.
- **Piperacillin-tazobactam** offers excellent coverage against common pathogens in neutropenic sepsis, including Gram-negative bacteria (like **Pseudomonas aeruginosa**), Gram-positive cocci, and anaerobes.
*Meropenem plus vancomycin*
- **Meropenem** is a carbapenem that is typically reserved for cases with suspected resistant organisms or when patients are not responding to first-line agents, to minimize the development of antimicrobial resistance.
- Routine empirical **vancomycin** is generally not recommended unless there is specific evidence of a **Hickman line infection site**, known MRSA colonization, or high local prevalence of MRSA, none of which are explicitly described here.
*Ceftriaxone plus metronidazole*
- **Ceftriaxone** is inadequate for treating **neutropenic sepsis** as it lacks crucial coverage against **Pseudomonas aeruginosa**, a common and aggressive pathogen in this immunocompromised population.
- This combination does not meet the guidelines for empirical treatment of **febrile neutropenia** and septic shock, which mandates reliable anti-pseudomonal activity.
*Amoxicillin plus gentamicin*
- **Amoxicillin** has a narrow spectrum and is completely insufficient for covering the severe Gram-negative infections commonly seen in **neutropenic sepsis**.
- While **gentamicin** targets Gram-negatives, its use is problematic given the patient's existing **acute kidney injury** (creatinine 185 μmol/L), and it is not typically recommended as initial monotherapy for septic shock.
*Ciprofloxacin alone*
- **Ciprofloxacin** is sometimes used for **prophylaxis** in low-risk neutropenic patients but is generally considered insufficient as monotherapy for the treatment of established **febrile neutropenia with septic shock**, particularly in high-risk cases.
- Relying solely on a quinolone in a critically ill patient with **neutropenic sepsis** is associated with poorer outcomes compared to more robust intravenous beta-lactam regimens.
Question 117: A 58-year-old man with known ischaemic heart disease presents with 3 hours of central crushing chest pain. His initial ECG shows 2 mm ST-segment elevation in leads V1-V4. He is given aspirin 300 mg, ticagrelor 180 mg, and morphine 5 mg intravenously. Primary percutaneous coronary intervention (PCI) is planned. Twenty minutes after arrival, he suddenly becomes unresponsive. The cardiac monitor shows a regular broad complex tachycardia at 180 bpm. He has no palpable pulse. What is the most appropriate immediate management?
A. Synchronised DC cardioversion with 150 joules biphasic
B. Unsynchronised DC defibrillation with 150 joules biphasic (Correct Answer)
C. Intravenous amiodarone 300 mg bolus
D. Precordial thump followed by assessment
E. Intravenous adenosine 6 mg rapid bolus
Explanation: ***Unsynchronised DC defibrillation with 150 joules biphasic***
- The patient is in **pulseless ventricular tachycardia (VT)**, which is a **shockable rhythm** managed the same way as ventricular fibrillation (VF) in the ALS algorithm.
- **Unsynchronised** shocks are mandatory in pulseless states because the defibrillator cannot track an R-wave to time a synchronised shock, necessitating immediate **defibrillation**.
*Synchronised DC cardioversion with 150 joules biphasic*
- This technique is reserved for **unstable patients who still have a pulse** to avoid delivering a shock during the vulnerable period of the T-wave.
- Using synchronised mode on a pulseless rhythm may result in a **failure to deliver the shock** because the machine cannot identify a distinct R-wave.
*Intravenous amiodarone 300 mg bolus*
- Amiodarone is an anti-arrhythmic medication indicated only after the **third unsuccessful shock** in the shockable rhythm protocol.
- It is not a substitute for **electrical therapy**, which is the most critical intervention for restoring a perfusing rhythm in pulseless VT.
*Precordial thump followed by assessment*
- A **precordial thump** is rarely used and only considered if the arrest is witnessed and monitored AND a **defibrillator is not immediately available**.
- Since the patient is in a hospital setting where a monitor/defibrillator is already attached, **immediate defibrillation** is the gold standard.
*Intravenous adenosine 6 mg rapid bolus*
- Adenosine is used for the management of **stable supraventricular tachycardias (SVT)** by slowing conduction through the AV node.
- It has no role in the management of **cardiac arrest** or broad complex pulseless rhythms.
Question 118: A 28-year-old woman is brought to the Emergency Department following a wasp sting 25 minutes ago. She has developed facial swelling, generalized urticaria, and difficulty breathing. She is treated with intramuscular adrenaline 500 micrograms, intravenous chlorphenamine 10 mg, and intravenous hydrocortisone 200 mg. Her initial blood pressure is 80/50 mmHg but improves to 100/65 mmHg after the first dose of adrenaline and 500 mL intravenous fluid bolus. She continues to have wheeze and appears anxious. What is the minimum duration this patient should be observed in hospital following initial improvement of her symptoms?
A. 1 hour after symptom resolution
B. 4 hours after symptom resolution
C. 6 hours after symptom resolution (Correct Answer)
D. 12 hours after symptom resolution
E. 24 hours after symptom resolution
Explanation: ***6 hours after symptom resolution***
- According to guidelines from organizations such as the **Resuscitation Council UK** and **NICE**, a minimum observation period of **6 hours** is recommended for patients who have experienced anaphylaxis and responded to initial treatment.
- This observation period is crucial for monitoring the patient for a potential **biphasic reaction**, which is a recurrence of anaphylactic symptoms without further allergen exposure and can occur several hours after the initial symptoms resolve.
*1 hour after symptom resolution*
- This duration is insufficient for anaphylaxis, as it poses a significant risk of missing a **biphasic reaction**, which can occur much later.
- Even for less severe allergic reactions, a longer observation period is typically recommended, making 1 hour inadequate for a patient with initial **hypotension** and **airway compromise**.
*4 hours after symptom resolution*
- While better than 1 hour, **4 hours** is generally considered inadequate for severe anaphylaxis, especially when symptoms included **hypotension** and respiratory distress.
- Many **biphasic reactions** are reported to occur between 4 and 8 hours post-initial symptom resolution, necessitating a longer observation period.
*12 hours after symptom resolution*
- This duration of observation is typically reserved for patients with more severe or complicated anaphylaxis, such as those with a **slow or incomplete response** to initial treatment, or requiring **repeated doses of adrenaline**.
- For a patient who has stabilized relatively quickly with a single dose of adrenaline and fluids, 12 hours exceeds the *minimum* recommended observation time.
*24 hours after symptom resolution*
- A **24-hour observation** or admission is usually indicated for patients at very high risk, for instance, those with **idiopathic anaphylaxis**, previous **protracted reactions**, or significant comorbidities.
- While providing maximal safety, it is generally not the *minimum* required observation for a case of anaphylaxis that responded well to initial emergency management.
Question 119: A 75-year-old woman with severe aortic stenosis presents after a syncopal episode while walking up stairs. She reports three similar episodes over the past month, all occurring during exertion. She denies chest pain but describes progressive dyspnoea on exertion over six months. Examination reveals a slow-rising pulse, blood pressure 110/70 mmHg, and an ejection systolic murmur loudest at the right upper sternal edge radiating to the carotids. Her ECG shows sinus rhythm with left ventricular hypertrophy. What is the most important immediate investigation to guide acute management?
A. Transthoracic echocardiography (Correct Answer)
B. 24-hour ambulatory ECG monitoring
C. Coronary angiography
D. Tilt table testing
E. CT pulmonary angiography
Explanation: ***Transthoracic echocardiography***
- This is the **gold standard** for confirming the severity of **aortic stenosis (AS)** by measuring the **valve area**, **peak velocity**, and **mean gradient**.
- It is essential for guiding acute management as it assesses **left ventricular function** and confirms the indication for **urgent valve replacement** in a symptomatic patient.
*24-hour ambulatory ECG monitoring*
- While it can detect **arrhythmias**, it is not the priority when the clinical history strongly points to **exertional syncope** from a structural obstruction.
- **AS symptoms** (angina, syncope, dyspnea) provide a more direct prognosis and indication for intervention than silent arrhythmic episodes in this context.
*Coronary angiography*
- This is often performed **pre-operatively** to assess for CAD before a valve procedure but is not the **immediate** investigation to confirm the underlying cause of syncope.
- It is a semi-invasive procedure that should follow non-invasive confirmation of **critical stenosis** severity.
*Tilt table testing*
- This test is used to diagnose **vasovagal syncope** or **postural orthostatic tachycardia syndrome**, which is not appropriate given the clear clinical signs of **valvular heart disease**.
- Testing for **neurally mediated syncope** is contraindicated or useless when a clear mechanical cause like **severe AS** is evident.
*CT pulmonary angiography*
- Used to rule out **pulmonary embolism**, which typically presents with **acute pleuritic chest pain** and sudden onset dyspnea rather than chronic **exertional syncope**.
- The presence of a **slow-rising pulse** and **radiating systolic murmur** makes a valvular cause significantly more likely than a vascular pulmonary event.
Question 120: A 62-year-old man with hypertension and type 2 diabetes presents with 8 hours of central chest discomfort described as 'heaviness'. His ECG shows sinus rhythm with T wave inversion in leads V2-V4. High-sensitivity troponin I measured at presentation is 250 ng/L (normal <16 ng/L). He is haemodynamically stable with blood pressure 135/85 mmHg, heart rate 75 bpm, oxygen saturation 98% on room air. His GRACE score is calculated as 145. According to current guidelines, what is the most appropriate timeframe for invasive coronary angiography in this patient?
A. Immediate angiography within 2 hours
B. Urgent angiography within 24 hours
C. Early angiography within 72 hours (Correct Answer)
D. Angiography during same hospital admission before discharge
E. Outpatient angiography within 6 weeks if symptoms persist
Explanation: ***Early angiography within 72 hours***
- This patient presents with a **Non-ST-elevation myocardial infarction (NSTEMI)**, indicated by central chest discomfort, **T-wave inversion** on ECG, and significantly elevated **troponin I** (250 ng/L).
- Given his high **GRACE score of 145** (high risk) and **haemodynamic stability**, current guidelines (e.g., ESC, NICE) recommend an **early invasive strategy** within 72 hours.
*Immediate angiography within 2 hours*
- This timeframe is reserved for **very high-risk NSTEMI/UA** features such as **haemodynamic instability**, cardiogenic shock, life-threatening arrhythmias, or refractory chest pain.
- The patient's vital signs are stable, with normal blood pressure, heart rate, and oxygen saturation, and no evidence of refractory pain.
*Urgent angiography within 24 hours*
- Urgent angiography within 24 hours is typically indicated for patients with a very high GRACE score (>140) in conjunction with **dynamic ST-T wave changes**, transient ST-elevation, or recurrent ischemia despite medical treatment.
- While his GRACE score is high, the absence of dynamic ECG changes or refractory ischemia means the 72-hour window is often considered the optimal timeframe for an early invasive approach in stable NSTEMI.
*Angiography during same hospital admission before discharge*
- This option is too vague and does not meet the specific early invasive target required for a high-risk NSTEMI patient.
- Delaying beyond the recommended **72-hour window** for a high-risk NSTEMI with elevated troponins can increase the risk of **recurrent ischemic events** and adverse outcomes.
*Outpatient angiography within 6 weeks if symptoms persist*
- This strategy is inappropriate for an **acute coronary syndrome (ACS)** with positive cardiac biomarkers confirming myocardial injury.
- Outpatient investigation is generally reserved for **stable angina** or low-risk chest pain syndromes where ACS has been ruled out.
