A 58-year-old man with recently diagnosed pulmonary tuberculosis has completed 2 months of rifampicin, isoniazid, pyrazinamide, and ethambutol. His sputum culture at diagnosis grew Mycobacterium tuberculosis fully sensitive to all first-line agents. Repeat sputum samples at 2 months remain culture positive. He has been fully adherent to treatment, confirmed by directly observed therapy. His liver and renal function are normal. What is the most appropriate next step in his management?
Q32
A 35-year-old woman from the Philippines with newly diagnosed smear-positive pulmonary tuberculosis is started on rifampicin, isoniazid, pyrazinamide, and ethambutol. After 3 weeks of treatment, she develops painful red nodules on her shins and ankle swelling. Examination reveals bilateral tender erythematous nodules on the anterior shins and periarticular swelling of both ankles. Her observations are: temperature 37.2°C, blood pressure 118/76 mmHg, heart rate 78 bpm. Which one of the following is the most appropriate management?
Q33
A 42-year-old man with HIV infection (CD4 count 150 cells/mm³) presents with a 2-week history of headache and fever. Lumbar puncture shows: opening pressure 28 cmH₂O, CSF protein 1.2 g/L, glucose 1.8 mmol/L (plasma glucose 5.2 mmol/L), white cells 120/mm³ (90% lymphocytes). India ink staining is positive. He is started on appropriate antifungal therapy. Which one of the following is the most important additional intervention to improve his outcome?
Q34
A 56-year-old man with end-stage renal failure on haemodialysis is diagnosed with smear-positive pulmonary tuberculosis. Drug susceptibility testing confirms fully sensitive Mycobacterium tuberculosis. Baseline blood tests show: creatinine 680 µmol/L, eGFR <15 mL/min/1.73m². Which anti-tuberculosis drug requires the most significant dose adjustment in this patient?
Q35
A 24-year-old woman presents with an 18-hour history of severe headache, photophobia, and fever. Examination reveals neck stiffness and Kernig's sign is positive. Lumbar puncture shows: opening pressure 18 cmH2O, clear CSF, white cells 380/mm³ (85% lymphocytes), protein 0.9 g/L, glucose 3.2 mmol/L (plasma glucose 5.5 mmol/L). CSF Gram stain and bacterial culture are negative. PCR for enteroviruses is positive. What is the most appropriate management?
Q36
A 35-year-old homeless man with alcohol dependency and untreated pulmonary tuberculosis presents to the emergency department with haemoptysis of approximately 400 mL of bright red blood over 2 hours. He is tachycardic (heart rate 125/min) and hypotensive (blood pressure 90/55 mmHg). Chest X-ray shows a cavity in the right upper lobe. What is the most appropriate immediate intervention?
Q37
A 43-year-old man from Uzbekistan presents with an 11-week history of fever, cough, and weight loss. Chest X-ray shows bilateral upper lobe infiltrates with cavitation. Sputum is smear-positive for acid-fast bacilli. Xpert MTB/RIF detects Mycobacterium tuberculosis with rifampicin resistance. He is started on an MDR-TB regimen including bedaquiline, linezolid, levofloxacin, cycloserine, and clofazimine. What baseline investigation is most critical to perform before continuing bedaquiline therapy?
Q38
A 61-year-old man with a CSF shunt for previous subarachnoid haemorrhage presents with a 5-day history of headache, fever, and confusion. CT head shows no acute changes. Lumbar puncture reveals: opening pressure 22 cmH2O, white cells 450/mm³ (80% neutrophils), protein 1.8 g/L, glucose 2.1 mmol/L (plasma glucose 5.8 mmol/L). Gram stain shows Gram-positive cocci in clusters. What is the most appropriate antibiotic regimen?
Q39
A 52-year-old man completes 6 months of treatment for fully drug-sensitive pulmonary tuberculosis (rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months, then rifampicin and isoniazid for 4 months). He had good adherence and clinical response. His pre-treatment chest X-ray showed right upper lobe consolidation with cavitation. What is the most appropriate post-treatment monitoring strategy?
Q40
A 33-year-old man presents with a 14-hour history of severe headache, fever, photophobia, and vomiting. He has a petechial rash on his legs. Blood pressure is 95/60 mmHg, heart rate 115/min, and he has a GCS of 13/15. Lumbar puncture is performed before antibiotics. CSF results show: turbid appearance, white cells 2800/mm³ (95% neutrophils), protein 3.2 g/L, glucose 1.1 mmol/L (plasma glucose 6.8 mmol/L). CSF Gram stain shows Gram-negative diplococci. What is the most important additional acute treatment alongside antibiotics?
Serious & Notifiable Infections UK Medical PG Practice Questions and MCQs
Question 31: A 58-year-old man with recently diagnosed pulmonary tuberculosis has completed 2 months of rifampicin, isoniazid, pyrazinamide, and ethambutol. His sputum culture at diagnosis grew Mycobacterium tuberculosis fully sensitive to all first-line agents. Repeat sputum samples at 2 months remain culture positive. He has been fully adherent to treatment, confirmed by directly observed therapy. His liver and renal function are normal. What is the most appropriate next step in his management?
A. Continue rifampicin and isoniazid for standard 4-month continuation phase (Correct Answer)
B. Extend the intensive phase by adding pyrazinamide and ethambutol for another month
C. Send sputum for repeat drug susceptibility testing and continue current regimen
D. Switch to second-line therapy with fluoroquinolone and injectable agent
E. Add a fluoroquinolone to rifampicin and isoniazid for the continuation phase
Explanation: ***Continue rifampicin and isoniazid for standard 4-month continuation phase***
- In a patient with confirmed **drug-sensitive TB** who is adherent to **Directly Observed Therapy (DOT)**, a positive culture at 2 months does not equate to treatment failure. This occurs in approximately 15% of patients.
- The standard management is to proceed to the **continuation phase** with rifampicin and isoniazid for 4 months, as most patients will achieve culture negativity by month 3.
*Extend the intensive phase by adding pyrazinamide and ethambutol for another month*
- Extending the **intensive phase** beyond 2 months is not routinely recommended by current guidelines for pansensitive TB, as it does not significantly improve outcomes and increases pill burden and potential side effects.
- The primary goal of the intensive phase is rapid bacterial killing and prevention of resistance, which should be achieved within the standard 2 months for sensitive strains.
*Send sputum for repeat drug susceptibility testing and continue current regimen*
- **Repeat drug susceptibility testing (DST)** is typically indicated if cultures remain positive at 3 months or later, or if there is a suspicion of non-adherence or initial drug resistance.
- Given initial full sensitivity and confirmed **adherence** via DOT, immediate repeat DST at 2 months is premature and not the standard next step.
*Switch to second-line therapy with fluoroquinolone and injectable agent*
- Switching to **second-line drugs** is unwarranted here because there is no evidence of **Multidrug-Resistant TB (MDR-TB)** or extensive drug resistance.
- Second-line agents are associated with higher toxicity, lower efficacy, and a longer duration of treatment, making their use inappropriate for a fully sensitive strain.
*Add a fluoroquinolone to rifampicin and isoniazid for the continuation phase*
- Adding a single drug like a **fluoroquinolone** to the standard continuation phase is not recommended and can promote the development of **acquired drug resistance**.
- The standard 2HREZ/4HR regimen is a highly effective and **validated protocol** for treating pansensitive Mycobacterium tuberculosis.
Question 32: A 35-year-old woman from the Philippines with newly diagnosed smear-positive pulmonary tuberculosis is started on rifampicin, isoniazid, pyrazinamide, and ethambutol. After 3 weeks of treatment, she develops painful red nodules on her shins and ankle swelling. Examination reveals bilateral tender erythematous nodules on the anterior shins and periarticular swelling of both ankles. Her observations are: temperature 37.2°C, blood pressure 118/76 mmHg, heart rate 78 bpm. Which one of the following is the most appropriate management?
A. Stop all anti-tuberculosis medications and perform drug rechallenge sequentially
B. Continue current treatment and provide symptomatic relief with NSAIDs (Correct Answer)
C. Replace pyrazinamide with moxifloxacin and continue other medications
D. Add prednisolone 40 mg daily and continue current anti-tuberculosis therapy
E. Stop ethambutol immediately and replace with a second-line agent
Explanation: ***Continue current treatment and provide symptomatic relief with NSAIDs***
- The patient is experiencing **erythema nodosum**, a delayed hypersensitivity reaction to **tuberculous antigens** released during effective treatment, often considered a form of **Immune Reconstitution Inflammatory Syndrome (IRIS)**.
- These nodules and periarticular swelling are **self-limiting** and do not represent drug toxicity; therefore, the full RIPE regimen should be continued while managing pain with **NSAIDs**.
*Stop all anti-tuberculosis medications and perform drug rechallenge sequentially*
- Stopping medications is reserved for **severe cutaneous adverse reactions (SCAR)** or **drug-induced hepatitis**, not for immunological reactions like erythema nodosum.
- Erythema nodosum is a reaction to the **bacillus**, not a hypersensitivity to the specific anti-tuberculous drugs themselves.
*Replace pyrazinamide with moxifloxacin and continue other medications*
- **Pyrazinamide** is commonly associated with hyperuricemia and gouty arthritis, but it does not cause the tender, red shin nodules classic of **erythema nodosum**.
- Replacing a first-line agent without evidence of **drug-induced liver injury** or intolerable toxicity compromises the efficacy of the intensive phase of treatment.
*Add prednisolone 40 mg daily and continue current anti-tuberculosis therapy*
- **Corticosteroids** are typically reserved for severe IRIS involving closed spaces (e.g., **CNS TB**) or life-threatening systemic inflammation.
- Erythema nodosum is generally mild and manageable with **simple analgesics**, making high-dose steroids unnecessary and potentially immunosuppressive.
*Stop ethambutol immediately and replace with a second-line agent*
- **Ethambutol** is primarily associated with **optic neuritis**; it is not the causative agent for pretibial nodules or ankle swelling.
- Routine cessation and replacement with less effective **second-line agents** increase the risk of developing drug-resistant tuberculosis.
Question 33: A 42-year-old man with HIV infection (CD4 count 150 cells/mm³) presents with a 2-week history of headache and fever. Lumbar puncture shows: opening pressure 28 cmH₂O, CSF protein 1.2 g/L, glucose 1.8 mmol/L (plasma glucose 5.2 mmol/L), white cells 120/mm³ (90% lymphocytes). India ink staining is positive. He is started on appropriate antifungal therapy. Which one of the following is the most important additional intervention to improve his outcome?
A. Commence adjunctive dexamethasone 0.4 mg/kg daily
B. Perform therapeutic lumbar puncture to reduce CSF opening pressure (Correct Answer)
C. Start empirical anti-tuberculosis therapy pending TB culture results
D. Insert external ventricular drain for continuous CSF drainage
E. Administer mannitol 20% infusion to reduce intracranial pressure
Explanation: ***Perform therapeutic lumbar puncture to reduce CSF opening pressure*** - Raised **intracranial pressure (ICP)**, indicated by an opening pressure of 28 cmH₂O, is the most important modifiable risk factor for mortality in **cryptococcal meningitis**. - **Serial therapeutic lumbar punctures** are essential to reduce CSF pressure, relieve symptoms, and improve outcomes by draining excess CSF, aiming for a pressure <20 cmH₂O or a 50% reduction. *Commence adjunctive dexamethasone 0.4 mg/kg daily* - Unlike in bacterial meningitis, **adjunctive corticosteroids** like dexamethasone are generally not recommended and may be harmful in **cryptococcal meningitis**, potentially increasing mortality and delaying fungal clearance. - Studies have not shown a benefit with steroid use in cryptococcal meningitis and it can exacerbate immunosuppression in HIV patients. *Start empirical anti-tuberculosis therapy pending TB culture results* - The **India ink stain** definitively confirmed **Cryptococcus neoformans**, making empirical anti-tuberculosis therapy unnecessary at this stage. - While TB meningitis is a differential in HIV, the specific diagnostic finding of **Cryptococcus** rules out the need for empirical TB treatment. *Insert external ventricular drain for continuous CSF drainage* - An **external ventricular drain (EVD)** is typically a salvage procedure for refractory raised ICP or **hydrocephalus** that doesn't respond to serial lumbar punctures. - It is a more invasive procedure and not the first-line management for elevated ICP in cryptococcal meningitis. *Administer mannitol 20% infusion to reduce intracranial pressure* - **Mannitol** provides only transient reduction in ICP by drawing water out of brain tissue and is primarily used for acute cerebral edema or herniation, not for chronic elevated ICP due to impaired CSF reabsorption in cryptococcal meningitis. - It does not address the underlying pathophysiology of **cryptococcal meningitis**-associated ICP and its effects are short-lived.
Question 34: A 56-year-old man with end-stage renal failure on haemodialysis is diagnosed with smear-positive pulmonary tuberculosis. Drug susceptibility testing confirms fully sensitive Mycobacterium tuberculosis. Baseline blood tests show: creatinine 680 µmol/L, eGFR <15 mL/min/1.73m². Which anti-tuberculosis drug requires the most significant dose adjustment in this patient?
A. Rifampicin - reduce dose by 50% due to reduced renal clearance
B. Isoniazid - give three times weekly after haemodialysis sessions only
C. Pyrazinamide - reduce dose and extend dosing interval due to renal excretion
D. Ethambutol - reduce dose and extend dosing interval due to renal excretion (Correct Answer)
E. None - all first-line drugs can be given at standard doses in renal failure
Explanation: ***Ethambutol - reduce dose and extend dosing interval due to renal excretion***
- **Ethambutol** is primarily eliminated via the **kidneys** (approximately 80%), and its accumulation in renal failure significantly increases the risk of dose-related **optic neuropathy**.
- In patients with an **eGFR <30 mL/min** or those on **haemodialysis**, the frequency is typically reduced to **three times weekly** to prevent irreversible visual loss.
*Rifampicin - reduce dose by 50% due to reduced renal clearance*
- **Rifampicin** is primarily metabolized by the **liver** and excreted into the bile, making it safe to use at standard doses in renal failure.
- No dose adjustment is required because its **renal clearance** is a negligible component of its total elimination.
*Isoniazid - give three times weekly after haemodialysis sessions only*
- **Isoniazid** undergoes **hepatic acetylation**, so it does not require significant dose reduction in renal impairment, though pyridoxine is added to prevent **neurotoxicity**.
- While it can be removed by dialysis, it is typically administered **daily**, though timing it after dialysis sessions is preferred to avoid premature drug removal.
*Pyrazinamide - reduce dose and extend dosing interval due to renal excretion*
- Although **Pyrazinamide** metabolites are renally cleared, current guidelines often prioritize keeping the dose standard while extending the **interval** rather than reducing the dose itself.
- While it does require adjustment (typically to **three times weekly**), **Ethambutol** is considered the most critical drug to adjust due to the higher specificity of its **toxic profile** (vision loss) to renal clearance.
*None - all first-line drugs can be given at standard doses in renal failure*
- This is incorrect because several first-line agents, specifically **Ethambutol** and **Pyrazinamide**, are known to accumulate to toxic levels in **end-stage renal disease**.
- Failure to adjust doses in **haemodialysis** patients leads to severe adverse effects, including **retrobulbar neuritis** and hyperuricaemia.
Question 35: A 24-year-old woman presents with an 18-hour history of severe headache, photophobia, and fever. Examination reveals neck stiffness and Kernig's sign is positive. Lumbar puncture shows: opening pressure 18 cmH2O, clear CSF, white cells 380/mm³ (85% lymphocytes), protein 0.9 g/L, glucose 3.2 mmol/L (plasma glucose 5.5 mmol/L). CSF Gram stain and bacterial culture are negative. PCR for enteroviruses is positive. What is the most appropriate management?
A. Intravenous aciclovir 10 mg/kg three times daily for 14 days
B. Intravenous ceftriaxone and aciclovir until HSV PCR excluded
C. Supportive care with analgesia and hydration only (Correct Answer)
D. Intravenous pleconaril if available through compassionate use
E. Intravenous immunoglobulin and supportive care
Explanation: ***Supportive care with analgesia and hydration only***- This patient has confirmed **enteroviral meningitis**, evidenced by lymphocytic pleocytosis, normal glucose, negative bacterial tests, and positive enterovirus PCR, which is typically a **self-limiting** condition in immunocompetent adults.- Management focuses on **symptomatic relief**, including adequate fluid intake and **analgesia** for headache and fever, as specific antiviral therapy is generally not required.*Intravenous aciclovir 10 mg/kg three times daily for 14 days*- **Aciclovir** is an antiviral specifically active against **Herpes Simplex Virus (HSV)** and Varicella-Zoster Virus, but it has **no efficacy** against **enteroviruses**.- This regimen is typically reserved for **HSV encephalitis**, which presents with more severe symptoms like **altered mental status** or focal neurological signs, not just meningitis.*Intravenous ceftriaxone and aciclovir until HSV PCR excluded*- While empirical broad-spectrum treatment is often initiated for suspected meningitis, the diagnostic workup here has **excluded bacterial meningitis** and confirmed **enteroviral etiology**.- Continuing unnecessary **antibiotics** (ceftriaxone) and **antivirals** (aciclovir) once the cause is identified contributes to **antimicrobial resistance** and potential side effects.*Intravenous pleconaril if available through compassionate use*- **Pleconaril** is an antiviral with activity against some enteroviruses, but it is **not routinely approved** or recommended for the treatment of typical enteroviral meningitis.- Its use is generally restricted to **severe, life-threatening enteroviral infections** or in specific high-risk populations, and it is usually only available through **compassionate use** protocols.*Intravenous immunoglobulin and supportive care*- **Intravenous immunoglobulin (IVIG)** is generally **not indicated** for the treatment of viral meningitis in **immunocompetent adults**.- IVIG may be considered for severe enteroviral infections in specific populations such as **neonates** or **immunocompromised** patients, which does not apply to this case.
Question 36: A 35-year-old homeless man with alcohol dependency and untreated pulmonary tuberculosis presents to the emergency department with haemoptysis of approximately 400 mL of bright red blood over 2 hours. He is tachycardic (heart rate 125/min) and hypotensive (blood pressure 90/55 mmHg). Chest X-ray shows a cavity in the right upper lobe. What is the most appropriate immediate intervention?
A. Arrange immediate bronchial artery embolisation
B. Position patient with right side down (bleeding side down) (Correct Answer)
C. Administer tranexamic acid and arrange urgent thoracic surgery
D. Intubate with a double-lumen endotracheal tube to isolate the lungs
E. Perform emergency rigid bronchoscopy for direct haemostasis
Explanation: ***Position patient with right side down (bleeding side down)***
- In cases of **massive haemoptysis**, the immediate priority is to prevent **asphyxiation** by ensuring blood does not flood the non-bleeding lung.
- Positioning the patient with the **affected side down** (the right side, as indicated by the cavitation on CXR) prevents aspiration into the healthy lung and may provide a slight **gravity-assisted tamponade** effect.
*Arrange immediate bronchial artery embolisation*
- **Bronchial artery embolisation (BAE)** is the gold standard for definitive management of massive haemoptysis in stable or stabilized patients.
- However, it is not the *immediate* bedside intervention required before the patient is safe for transport to the **radiology suite**.
*Administer tranexamic acid and arrange urgent thoracic surgery*
- **Tranexamic acid** may have a role in reducing the volume of bleeding but cannot replace the urgent mechanical stabilization needed for airway protection.
- **Thoracic surgery** is generally a second-line or salvage treatment if BAE fails, due to the high mortality associated with emergency lung resection in unstable patients.
*Intubate with a double-lumen endotracheal tube to isolate the lungs*
- While **lung isolation** is a key goal, a **double-lumen tube (DLT)** is technically difficult to insert, especially in an emergency with high volumes of blood obstructing the view.
- Standard initial management prioritizes positioning and large-bore **single-lumen intubation** if necessary, as placing a DLT requires specialized anesthesia skill and often a bronchoscope.
*Perform emergency rigid bronchoscopy for direct haemostasis*
- **Rigid bronchoscopy** is highly effective for clearing clots and providing mechanical tamponade, but it requires general anesthesia and specialized equipment.
- It is a procedural intervention that follows the immediate stabilization steps of **positioning** and fluid resuscitation.
Question 37: A 43-year-old man from Uzbekistan presents with an 11-week history of fever, cough, and weight loss. Chest X-ray shows bilateral upper lobe infiltrates with cavitation. Sputum is smear-positive for acid-fast bacilli. Xpert MTB/RIF detects Mycobacterium tuberculosis with rifampicin resistance. He is started on an MDR-TB regimen including bedaquiline, linezolid, levofloxacin, cycloserine, and clofazimine. What baseline investigation is most critical to perform before continuing bedaquiline therapy?
A. 12-lead electrocardiogram to assess QTc interval (Correct Answer)
B. Echocardiogram to assess left ventricular function
C. 24-hour Holter monitor to detect arrhythmias
D. Exercise tolerance test to assess cardiovascular fitness
E. Cardiac MRI to assess for myocardial involvement
Explanation: ***12-lead electrocardiogram to assess QTc interval***
- **Bedaquiline**, along with **clofazimine** and **levofloxacin**, is known to cause **QTc interval prolongation**, which increases the risk of life-threatening **torsades de pointes**.
- A baseline **12-lead ECG** is mandatory to ensure the QTc is within safe limits (typically <450ms in men) before initiation and for ongoing monitoring at specific intervals.
*Echocardiogram to assess left ventricular function*
- While useful for evaluating anatomical heart disease, this test does not provide information regarding the **cardiac electrical conduction** system affected by the medication.
- Bedaquiline does not typically cause **heart failure** or structural dysfunction that would necessitate a baseline echocardiogram.
*24-hour Holter monitor to detect arrhythmias*
- A **Holter monitor** is generally used for detecting intermittent arrhythmias over a long period rather than characterizing the **QT interval** for drug safety screening.
- A standard **12-lead ECG** is more practical, cost-effective, and sufficient for the standardized measurement of the **Fridericia-corrected QT (QTcF)**.
*Exercise tolerance test to assess cardiovascular fitness*
- There is no clinical indication that **exercise-induced ischemia** or fitness levels impact the safety profile of bedaquiline therapy.
- This test does not provide a reliable measure of the **resting QTc interval**, which is the primary safety concern for this MDR-TB drug.
*Cardiac MRI to assess for myocardial involvement*
- **Cardiac MRI** is an advanced imaging modality used for detecting infiltrative diseases or **myocarditis**, which are not standard complications of bedaquiline.
- It is not a recommended or necessary baseline screening tool for patients starting **MDR-TB** regimens.
Question 38: A 61-year-old man with a CSF shunt for previous subarachnoid haemorrhage presents with a 5-day history of headache, fever, and confusion. CT head shows no acute changes. Lumbar puncture reveals: opening pressure 22 cmH2O, white cells 450/mm³ (80% neutrophils), protein 1.8 g/L, glucose 2.1 mmol/L (plasma glucose 5.8 mmol/L). Gram stain shows Gram-positive cocci in clusters. What is the most appropriate antibiotic regimen?
A. Intravenous ceftriaxone and vancomycin
B. Intravenous vancomycin and rifampicin (Correct Answer)
C. Intravenous flucloxacillin and gentamicin
D. Intravenous meropenem and amikacin
E. Intravenous benzylpenicillin and chloramphenicol
Explanation: ***Intravenous vancomycin and rifampicin***
- The presence of **Gram-positive cocci in clusters** in a patient with a **CSF shunt** strongly indicates a staphylococcal infection, such as *Staphylococcus epidermidis* or *Staphylococcus aureus*.
- **Vancomycin** is the treatment of choice to cover methicillin resistance, while **rifampicin** is added for its excellent CNS penetration and ability to penetrate **biofilms** on prosthetic devices.
*Intravenous ceftriaxone and vancomycin*
- While this is a standard regimen for **community-acquired meningitis**, ceftriaxone lacks sufficient activity against many **healthcare-associated staphylococci**.
- This combination is more suited for coverage of *Streptococcus pneumoniae* and *Neisseria meningitidis*, which do not present as clusters on Gram stain.
*Intravenous flucloxacillin and gentamicin*
- **Flucloxacillin** is inappropriate here because a high percentage of shunt infections are caused by **methicillin-resistant** organisms (MRSA or MRSE).
- **Gentamicin** has poor **cerebrospinal fluid (CSF) penetration** and is not the preferred agent for empirical shunt-related ventriculitis.
*Intravenous meropenem and amikacin*
- These agents provide broad **Gram-negative coverage**, which might be considered empirically if the Gram stain was negative or showed Gram-negative rods.
- They do not provide optimal coverage for the **Gram-positive clusters** identified in this clinical scenario.
*Intravenous benzylpenicillin and chloramphenicol*
- **Benzylpenicillin** is narrow-spectrum and ineffective against the **beta-lactamase-producing** staphylococci commonly found in shunt infections.
- This regimen is outdated for most modern healthcare-associated CNS infections where **resistant organisms** are highly prevalent.
Question 39: A 52-year-old man completes 6 months of treatment for fully drug-sensitive pulmonary tuberculosis (rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months, then rifampicin and isoniazid for 4 months). He had good adherence and clinical response. His pre-treatment chest X-ray showed right upper lobe consolidation with cavitation. What is the most appropriate post-treatment monitoring strategy?
A. Repeat chest X-ray at completion, then clinical follow-up only if symptoms recur (Correct Answer)
B. Monthly sputum cultures for 6 months post-treatment
C. Repeat chest X-ray and sputum culture at treatment completion, then routine follow-up
D. CT chest at treatment completion to assess for residual disease
E. Mantoux test at 3 months post-treatment to assess treatment response
Explanation: ***Repeat chest X-ray at completion, then clinical follow-up only if symptoms recur***
- A **chest X-ray at the end of treatment** is recommended to serve as a **baseline** for future comparison if the patient develops respiratory symptoms later.
- For patients with **fully drug-sensitive TB** and good adherence, routine follow-up or serial testing is not required; patients should be advised to seek care if **symptoms recur**.
*Monthly sputum cultures for 6 months post-treatment*
- Routine **microbiological monitoring** after treatment completion is unnecessary for patients who have successfully completed the standard regimen for **drug-sensitive TB**.
- This intensive monitoring is typically reserved for **multidrug-resistant TB (MDR-TB)** or cases with poor initial clinical response.
*Repeat chest X-ray and sputum culture at treatment completion, then routine follow-up*
- While an end-of-treatment X-ray is useful, **routine sputum cultures** and scheduled long-term follow-up are not recommended by **national and international guidelines** for uncomplicated cases.
- Treatment success is primarily determined by **clinical improvement** and completion of the prescribed therapeutic course, rather than repetitive post-treatment testing.
*CT chest at treatment completion to assess for residual disease*
- A **CT chest** is not a standard tool for routine monitoring of treatment response due to **radiation exposure** and cost.
- Residual changes like **fibrosis or calcification** are common post-TB and do not indicate active disease or the need for further treatment.
*Mantoux test at 3 months post-treatment to assess treatment response*
- The **Mantoux test (TST)** or **IGRA** cannot be used to monitor treatment efficacy as they typically remain positive due to **immunological memory**.
- These tests measure **delayed-type hypersensitivity** and cannot distinguish between latent infection, active disease, or successfully treated tuberculosis.
Question 40: A 33-year-old man presents with a 14-hour history of severe headache, fever, photophobia, and vomiting. He has a petechial rash on his legs. Blood pressure is 95/60 mmHg, heart rate 115/min, and he has a GCS of 13/15. Lumbar puncture is performed before antibiotics. CSF results show: turbid appearance, white cells 2800/mm³ (95% neutrophils), protein 3.2 g/L, glucose 1.1 mmol/L (plasma glucose 6.8 mmol/L). CSF Gram stain shows Gram-negative diplococci. What is the most important additional acute treatment alongside antibiotics?
A. Intravenous dexamethasone 10 mg six-hourly for 4 days
B. Intravenous aciclovir 10 mg/kg eight-hourly
C. Immediate fluid resuscitation with crystalloids to restore blood pressure (Correct Answer)
D. Mannitol infusion to reduce intracranial pressure
E. Fresh frozen plasma to correct coagulopathy
Explanation: ***Immediate fluid resuscitation with crystalloids to restore blood pressure***
- The patient exhibits classic signs of **septic shock** (hypotension, tachycardia, and altered GCS) secondary to confirmed **bacterial meningitis** with meningococcemia, making immediate hemodynamic stabilization paramount.
- Prompt **volume expansion** with crystalloids is essential to improve organ perfusion, reverse shock, and significantly reduce mortality in this critical condition.
*Intravenous dexamethasone 10 mg six-hourly for 4 days*
- While **dexamethasone** is an adjunct therapy for bacterial meningitis to reduce inflammatory complications, especially in **pneumococcal meningitis**, its benefit in meningococcal meningitis is less clear and it is secondary to life-saving resuscitation.
- Prioritizing corticosteroids over immediate management of **circulatory collapse** would delay critical care for a patient in septic shock.
*Intravenous aciclovir 10 mg/kg eight-hourly*
- **Aciclovir** is a specific antiviral agent for conditions like **Herpes Simplex Encephalitis**, which presents with distinct CSF findings (lymphocytic pleocytosis, normal glucose, no bacterial growth).
- The CSF results here (turbid, high neutrophils, very low glucose, **Gram-negative diplococci**) definitively point to a bacterial infection, making antiviral therapy inappropriate.
*Mannitol infusion to reduce intracranial pressure*
- **Mannitol** is used to reduce **intracranial pressure (ICP)** in cases of cerebral edema or impending herniation, which can be a complication of severe meningitis.
- However, the most immediate life-threatening issue in this patient is **septic shock**; addressing hypotension and hypoperfusion takes precedence over managing ICP unless there are clear signs of acute herniation.
*Fresh frozen plasma to correct coagulopathy*
- **Fresh frozen plasma (FFP)** is used to correct **coagulopathy** or treat **disseminated intravascular coagulation (DIC)**, which can complicate severe sepsis.
- While DIC can occur, the most immediate and critical intervention for a patient in **septic shock** with hypotension is fluid resuscitation to maintain vital organ perfusion, rather than FFP for potential coagulopathy.
