Common Infections — MCQs
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A 47-year-old woman with rheumatoid arthritis on methotrexate 20mg weekly and adalimumab (anti-TNF therapy) presents with a 3-day history of pain and swelling of her right index finger. Examination reveals a tender, fluctuant swelling over the flexor tendon sheath of the finger with the finger held in slight flexion. Passive extension causes severe pain. There is no lymphangitis or systemic features. What is the most important immediate management step?
A hospital trust conducts a point prevalence survey and finds that 35% of all inpatients are receiving at least one antimicrobial agent. Further analysis reveals that documentation of the indication, review date, and route of administration is missing in 42% of prescriptions. Which of the following interventions aligns best with the 'Start Smart - Then Focus' antimicrobial stewardship framework to address this documentation issue?
A 41-year-old man who works as a butcher presents with a 4-day history of a painless, black eschar on his right forearm surrounded by significant non-pitting oedema extending to his upper arm. He recalls a minor cut at work 1 week ago. He is systemically well with normal observations. What is the most likely diagnosis and appropriate first-line antibiotic therapy?
A 54-year-old woman with end-stage renal failure on continuous ambulatory peritoneal dialysis (CAPD) presents with a 2-day history of cloudy peritoneal dialysate fluid and diffuse abdominal pain. She is afebrile with stable observations. Dialysate white cell count is 480 cells/μL (>100 cells/μL abnormal) with 78% neutrophils. Gram stain shows gram-positive cocci in clusters. According to ISPD guidelines, what is the most appropriate initial empirical antibiotic regimen pending culture results?
What is the typical causative organism of erysipelas?
A hospital antimicrobial stewardship team reviews prescribing patterns for community-acquired pneumonia and finds that 68% of patients admitted with low-severity pneumonia (CURB-65 score 0-1) are receiving dual therapy with co-amoxiclav and clarithromycin rather than the recommended single-agent oral amoxicillin. Which behavioural intervention strategy would be most effective in improving guideline adherence?
A 76-year-old man with ischaemic heart disease, chronic kidney disease stage 3b (eGFR 38 mL/min/1.73m²), and atrial fibrillation on apixaban presents with a 5-day history of a painful swollen right leg. Examination reveals extensive erythema from mid-calf to groin with areas of skin blistering and purple discolouration. Temperature is 39.4°C, BP 98/62 mmHg, heart rate 118 bpm. Blood tests show WCC 19.8 × 10⁹/L, CRP 285 mg/L, creatinine 198 μmol/L (baseline 142), lactate 3.8 mmol/L, and creatine kinase 1,820 U/L. What is the most appropriate empirical antibiotic regimen?
According to UK antimicrobial stewardship guidance, which statement best describes the concept of 'antibiotic heterogeneity' as a strategy to reduce antimicrobial resistance at the population level?
A 63-year-old woman with type 2 diabetes presents with a painful red swelling on her left thigh that has been present for 3 days. On examination, there is a 6cm area of erythema, warmth, and tenderness with central fluctuance. Her temperature is 38.2°C, heart rate 96 bpm, and blood pressure 132/78 mmHg. Blood tests show WCC 13.2 × 10⁹/L and CRP 82 mg/L. What is the most appropriate initial management?
A hospital antimicrobial stewardship committee reviews prescribing data showing that empirical carbapenem use has increased by 35% over 12 months, primarily for intra-abdominal sepsis and complicated urinary tract infections. Which stewardship intervention would be most effective in reducing inappropriate carbapenem use while maintaining patient safety?
Common Infections UK Medical PG Practice Questions and MCQs
Question 61: A 47-year-old woman with rheumatoid arthritis on methotrexate 20mg weekly and adalimumab (anti-TNF therapy) presents with a 3-day history of pain and swelling of her right index finger. Examination reveals a tender, fluctuant swelling over the flexor tendon sheath of the finger with the finger held in slight flexion. Passive extension causes severe pain. There is no lymphangitis or systemic features. What is the most important immediate management step?
- A. Commence intravenous flucloxacillin and observe for 48 hours
- B. Urgent hand surgery referral for incision and drainage within 24 hours (Correct Answer)
- C. Aspiration of the swelling and commence oral co-amoxiclav
- D. Arrange urgent MRI scan to assess extent of infection
- E. Increase prednisolone dose and add oral antibiotics
Explanation: ***Urgent hand surgery referral for incision and drainage within 24 hours*** - The patient's presentation with flexion posture, fusiform swelling, tenderness along the flexor sheath, and severe pain on passive extension are the classic **Kanavel's signs**, highly indicative of **pyogenic flexor tenosynovitis**. - This condition is a **surgical emergency** requiring prompt incision and drainage to prevent rapid progression to **tendon necrosis**, adhesion formation, and permanent functional impairment, especially in an **immunosuppressed** patient on **anti-TNF therapy**. *Commence intravenous flucloxacillin and observe for 48 hours* - While intravenous antibiotics are necessary, they are insufficient as **monotherapy** for pyogenic flexor tenosynovitis because they cannot adequately penetrate the infected, **pressure-closed tendon sheath**. - **Observing for 48 hours** is dangerous and can lead to irreversible **tendon damage** or rupture due to sustained infection and pressure within the sheath. *Aspiration of the swelling and commence oral co-amoxiclav* - **Aspiration** is not an effective or definitive treatment for pyogenic flexor tenosynovitis, as it rarely achieves complete drainage of the complex tendon sheath and risks disseminating the infection. - **Oral co-amoxiclav** is inadequate for a severe, deep-seated infection in an immunocompromised patient; **intravenous antibiotics** are required. *Arrange urgent MRI scan to assess extent of infection* - The diagnosis of pyogenic flexor tenosynovitis is primarily **clinical**, based on the presence of **Kanavel's signs**, making an MRI scan unnecessary for diagnosis. - Waiting for an **MRI scan** would cause a critical delay in definitive surgical management, increasing the risk of severe complications such as **tendon necrosis**. *Increase prednisolone dose and add oral antibiotics* - Increasing the **prednisolone** dose would further suppress the patient's already compromised immune system due to **methotrexate** and **adalimumab**, exacerbating the bacterial infection. - This approach wrongly treats the acute infection as an **inflammatory flare** of rheumatoid arthritis, which can have devastating consequences in the context of a surgical emergency.
Question 62: A hospital trust conducts a point prevalence survey and finds that 35% of all inpatients are receiving at least one antimicrobial agent. Further analysis reveals that documentation of the indication, review date, and route of administration is missing in 42% of prescriptions. Which of the following interventions aligns best with the 'Start Smart - Then Focus' antimicrobial stewardship framework to address this documentation issue?
- A. Implementing a hospital-wide ban on verbal antibiotic orders
- B. Requiring completion of an antimicrobial prescription form documenting indication, route, dose, duration/review date, and signature at the time of prescribing (Correct Answer)
- C. Reducing the hospital formulary to include only narrow-spectrum antibiotics
- D. Mandating infectious disease consultation for all antimicrobial prescriptions
- E. Introducing financial penalties for prescribers with poor documentation rates
Explanation: ***Requiring completion of an antimicrobial prescription form documenting indication, route, dose, duration/review date, and signature at the time of prescribing*** - The **'Start Smart'** component of the framework mandates that every antimicrobial prescription must include clinical **indication**, dose, **route**, and a clear **duration or review date**. - Implementing a structured form directly addresses the 42% documentation gap by making these fields a mandatory requirement for the initiation of therapy. *Implementing a hospital-wide ban on verbal antibiotic orders* - While banning verbal orders improves **patient safety** and reduces errors, it does not ensure that the necessary **clinical indication** or **review date** is actually recorded. - This intervention focuses on **communication protocol** rather than the systematic documentation requirements of the 'Start Smart' toolkit. *Reducing the hospital formulary to include only narrow-spectrum antibiotics* - Formulary restriction is a **stewardship strategy** to limit the use of broad-spectrum agents, but it does not fix issues related to **missing documentation**. - It addresses **antibiotic selection** rather than the clinical governance and **auditability** of the prescribing process. *Mandating infectious disease consultation for all antimicrobial prescriptions* - This approach is highly **resource-intensive** and impractical for the high volume of prescriptions seen in a hospital prevalence survey. - The framework emphasizes providing **prescribers** with the tools to document correctly themselves rather than transferring all **decision-making** to specialists. *Introducing financial penalties for prescribers with poor documentation rates* - Financial penalties are **punitive measures** that do not provide the systems-based support needed to improve **clinical workflow** or documentation habits. - Effective stewardship relies on **behavioral change** and structural supports, such as standardized forms, rather than negative reinforcement.
Question 63: A 41-year-old man who works as a butcher presents with a 4-day history of a painless, black eschar on his right forearm surrounded by significant non-pitting oedema extending to his upper arm. He recalls a minor cut at work 1 week ago. He is systemically well with normal observations. What is the most likely diagnosis and appropriate first-line antibiotic therapy?
- A. Anthrax – intravenous ciprofloxacin and clindamycin (Correct Answer)
- B. Necrotising fasciitis – intravenous piperacillin-tazobactam and clindamycin
- C. Ecthyma gangrenosum – intravenous meropenem
- D. Tularaemia – oral doxycycline
- E. Cutaneous leishmaniasis – liposomal amphotericin B
Explanation: ***Anthrax – intravenous ciprofloxacin and clindamycin*** - The hallmark of **cutaneous anthrax** is a **painless black eschar** surrounded by extensive **non-pitting oedema**, often following occupational exposure to infected animal products (e.g., a **butcher**). - Treatment requires **ciprofloxacin** for bactericidal action and **clindamycin** to inhibit the production of potent **anthrax toxins**. *Necrotising fasciitis – intravenous piperacillin-tazobactam and clindamycin* - This is a surgical emergency characterized by **exquisite pain out of proportion** to clinical findings and rapid **systemic toxicity**, unlike the painless lesion and normal observations in this scenario. - It involves deep tissue destruction and often presents with crepitus, rather than a localized, stable, painless eschar with massive oedema. *Ecthyma gangrenosum – intravenous meropenem* - Typically occurs in **severely neutropenic** or immunocompromised patients as a result of **Pseudomonas aeruginosa** septicaemia. - The lesions are usually multiple, painful or tender, and develop into necrotic ulcers rather than being associated with occupational hide/meat exposure. *Tularaemia – oral doxycycline* - Caused by *Francisella tularensis*, this usually presents as a **painful ulcer** at the site of inoculation accompanied by significant regional **lymphadenopathy**. - While it can be zoonotic, it lacks the classic wide-spreading **gelatinous oedema** seen in cutaneous anthrax. *Cutaneous leishmaniasis – liposomal amphotericin B* - This parasitic infection typically presents as a **slow-growing chronic ulcer** or nodule that develops over weeks to months in travelers to endemic regions. - It does not present with the acute, massive oedema or the specific **black eschar** morphology within a 1-week timeframe.
Question 64: A 54-year-old woman with end-stage renal failure on continuous ambulatory peritoneal dialysis (CAPD) presents with a 2-day history of cloudy peritoneal dialysate fluid and diffuse abdominal pain. She is afebrile with stable observations. Dialysate white cell count is 480 cells/μL (>100 cells/μL abnormal) with 78% neutrophils. Gram stain shows gram-positive cocci in clusters. According to ISPD guidelines, what is the most appropriate initial empirical antibiotic regimen pending culture results?
- A. Intraperitoneal vancomycin and intraperitoneal ceftazidime (Correct Answer)
- B. Intravenous flucloxacillin and intravenous gentamicin
- C. Intraperitoneal vancomycin alone
- D. Intravenous vancomycin and intravenous meropenem
- E. Intraperitoneal cefazolin and intraperitoneal gentamicin
Explanation: ***Intraperitoneal vancomycin and intraperitoneal ceftazidime***- Per the **ISPD guidelines**, empirical therapy for **CAPD-associated peritonitis** must cover both **Gram-positive** and **Gram-negative** organisms regardless of the initial Gram stain.- The **intraperitoneal (IP) route** is preferred over intravenous administration as it achieves significantly higher concentrations at the site of infection.*Intravenous flucloxacillin and intravenous gentamicin*- The **intravenous route** is less effective than the intraperitoneal route for treating the local peritoneal infection and is generally reserved for patients with **systemic sepsis**.- **Flucloxacillin** does not provide adequate coverage for **methicillin-resistant Staphylococcus aureus (MRSA)**, which is a common pathogen in dialysis patients.*Intraperitoneal vancomycin alone*- While the Gram stain suggests **Gram-positive cocci**, empirical treatment must remain broad-spectrum to include Gram-negative coverage until **culture results** are finalized.- Monotherapy risks treatment failure if a **polymicrobial infection** or a Gram-negative organism is present but not captured on the initial stain.*Intravenous vancomycin and intravenous meropenem*- **Meropenem** is unnecessarily broad for initial empirical therapy and should be reserved for **multidrug-resistant** organisms or severe clinical deterioration.- As with other intravenous options, this delivery method is inferior to **intraperitoneal administration** for achieving therapeutic levels in the dialysate.*Intraperitoneal cefazolin and intraperitoneal gentamicin*- **Cefazolin** is an acceptable alternative for Gram-positive coverage only in centers with very low rates of **MRSA**; vancomycin is preferred if resistance is a concern.- While **gentamicin** provides Gram-negative coverage, the combination of **vancomycin and ceftazidime** is often favored due to the potential **ototoxicity** and nephrotoxicity associated with aminoglycosides.
Question 65: What is the typical causative organism of erysipelas?
- A. Staphylococcus aureus
- B. Streptococcus pyogenes (Group A Streptococcus) (Correct Answer)
- C. Pseudomonas aeruginosa
- D. Escherichia coli
- E. Pasteurella multocida
Explanation: ***Streptococcus pyogenes (Group A Streptococcus)***- **Erysipelas** is a superficial skin infection characteristically caused by **Group A beta-hemolytic Streptococcus**, involving the upper dermis and superficial lymphatics.- It presents as a bright red, edematous plaque with **sharply demarcated borders**, distinguishing it from deeper infections like cellulitis.*Staphylococcus aureus*- **Staphylococcus aureus** is the primary cause of many skin infections like **folliculitis**, **furuncles**, and **abscesses**, but is a rare cause of classic erysipelas.- While it can cause **cellulitis**, it typically lacks the raised, clear-cut margin seen in streptococcal erysipelas.*Pseudomonas aeruginosa*- This organism is an opportunistic pathogen typically associated with **burn wound infections**, **puncture wounds** through sneakers, or **hot tub folliculitis**.- It is not a common cause of primary **erysipelas** in a healthy individual.*Escherichia coli*- **E. coli** is a common cause of **urinary tract infections** and neonatal meningitis but is an infrequent cause of primary skin and soft tissue infections.- Skin involvement with E. coli is usually seen in **immunocompromised** patients or as part of a **polymicrobial** surgical site infection.*Pasteurella multocida*- This organism is classically associated with infections following **animal bites**, particularly from **cats or dogs**.- It produces a rapid-onset cellulitis rather than the **sharply circumscribed erythema** typical of erysipelas.
Question 66: A hospital antimicrobial stewardship team reviews prescribing patterns for community-acquired pneumonia and finds that 68% of patients admitted with low-severity pneumonia (CURB-65 score 0-1) are receiving dual therapy with co-amoxiclav and clarithromycin rather than the recommended single-agent oral amoxicillin. Which behavioural intervention strategy would be most effective in improving guideline adherence?
- A. Sending monthly email reminders to all prescribers about the guidelines
- B. Implementing restrictive antimicrobial approval requiring consultant approval for dual therapy in low-severity pneumonia
- C. Embedding clinical decision support into the electronic prescribing system that prompts guideline-concordant choices based on CURB-65 score (Correct Answer)
- D. Conducting annual mandatory e-learning modules on antimicrobial prescribing
- E. Publishing audit results in the hospital newsletter with names of high prescribers
Explanation: ***Embedding clinical decision support into the electronic prescribing system that prompts guideline-concordant choices based on CURB-65 score*** - **Clinical Decision Support Systems (CDSS)** are highly effective because they provide **real-time, point-of-care guidance** at the exact moment a prescribing decision is made. - This intervention utilizes **nudge theory**, making the guideline-concordant choice the **default or easiest option**, thereby reducing cognitive load and errors in judgment. *Sending monthly email reminders to all prescribers about the guidelines* - This is a **passive intervention** that is often ignored due to **information overload** and lack of relevance to the immediate clinical context. - Reminders lack the **immediacy** required to change behavior during the actual workflow of admitting a patient. *Implementing restrictive antimicrobial approval requiring consultant approval for dual therapy in low-severity pneumonia* - While **restrictive stewardship** can be effective, it often creates **workflow barriers** and may unnecessarily delay treatment in a busy clinical environment. - This approach can lead to **clinician frustration** and "workarounds" rather than fostering a genuine understanding of guideline adherence. *Conducting annual mandatory e-learning modules on antimicrobial prescribing* - **E-learning modules** improve knowledge but are generally ineffective at producing **sustained behavioral change** when used as a standalone strategy. - The long gap between the training and the clinical application means the **retention of specific guidelines** like CURB-65 thresholds is often poor. *Publishing audit results in the hospital newsletter with names of high prescribers* - Using **public shaming** or peer pressure, while sometimes effective for specific issues, can create a **negative working environment** and foster resentment rather than genuine engagement with stewardship goals. - This strategy focuses on **retrospective judgment** rather than proactive, real-time support to prevent inappropriate prescribing.
Question 67: A 76-year-old man with ischaemic heart disease, chronic kidney disease stage 3b (eGFR 38 mL/min/1.73m²), and atrial fibrillation on apixaban presents with a 5-day history of a painful swollen right leg. Examination reveals extensive erythema from mid-calf to groin with areas of skin blistering and purple discolouration. Temperature is 39.4°C, BP 98/62 mmHg, heart rate 118 bpm. Blood tests show WCC 19.8 × 10⁹/L, CRP 285 mg/L, creatinine 198 μmol/L (baseline 142), lactate 3.8 mmol/L, and creatine kinase 1,820 U/L. What is the most appropriate empirical antibiotic regimen?
- A. Intravenous flucloxacillin 2g four times daily
- B. Intravenous co-amoxiclav 1.2g three times daily and clarithromycin 500mg twice daily
- C. Intravenous meropenem 1g three times daily and clindamycin 600mg four times daily
- D. Intravenous piperacillin-tazobactam 4.5g three times daily, clindamycin 600mg four times daily, and linezolid 600mg twice daily (Correct Answer)
- E. Intravenous vancomycin 1g twice daily and metronidazole 500mg three times daily
Explanation: ***Intravenous piperacillin-tazobactam 4.5g three times daily, clindamycin 600mg four times daily, and linezolid 600mg twice daily***- The patient presents with classic signs of **necrotising fasciitis**, including severe systemic toxicity (septic shock), rapidly progressing skin changes with **blistering and purple discolouration** (tissue necrosis), elevated **lactate**, and a significantly raised **creatine kinase**, necessitating broad-spectrum coverage for aerobes and anaerobes.- This regimen provides extensive coverage: **piperacillin-tazobactam** targets Gram-positives, Gram-negatives (including Pseudomonas), and anaerobes; **linezolid** adds crucial coverage for **MRSA**; and **clindamycin** is vital for inhibiting bacterial **toxin production** and protein synthesis, which is key in mitigating the systemic inflammatory response in necrotising fasciitis.*Intravenous flucloxacillin 2g four times daily*- This regimen offers narrow-spectrum coverage primarily for penicillin-sensitive **Staphylococcus aureus** and **Group A Streptococcus**, which is insufficient for a suspected polymicrobial **necrotising fasciitis**.- It completely lacks activity against crucial pathogens such as **Gram-negative bacilli** (e.g., Pseudomonas), **anaerobes**, and **MRSA**, and does not provide the toxin-inhibiting properties of clindamycin.*Intravenous co-amoxiclav 1.2g three times daily and clarithromycin 500mg twice daily*- While co-amoxiclav provides some broad-spectrum coverage, this combination is typically used for severe **cellulitis** or community-acquired pneumonia, not for a life-threatening necrotising soft tissue infection.- It fails to provide adequate empirical coverage for potential **MRSA**, highly resistant **Gram-negative organisms**, or the strong **anti-toxin effect** required for necrotising fasciitis.*Intravenous meropenem 1g three times daily and clindamycin 600mg four times daily*- Meropenem provides excellent broad-spectrum coverage for Gram-positives, Gram-negatives (including Pseudomonas), and anaerobes, making it a strong base for severe infections, and clindamycin is crucial for toxin suppression.- However, this specific regimen **lacks empiric coverage for MRSA**, which is a significant pathogen in severe necrotising infections, and a crucial component of initial broad-spectrum therapy in critically ill patients.*Intravenous vancomycin 1g twice daily and metronidazole 500mg three times daily*- Vancomycin covers Gram-positives, including **MRSA**, and metronidazole covers anaerobes, but this combination is incomplete for a suspected necrotising fasciitis.- This regimen lacks adequate broad-spectrum coverage for common **Gram-negative pathogens** (including Pseudomonas) and omits the critical addition of **clindamycin** for its specific role in modulating the severe toxin-mediated inflammatory response.
Question 68: According to UK antimicrobial stewardship guidance, which statement best describes the concept of 'antibiotic heterogeneity' as a strategy to reduce antimicrobial resistance at the population level?
- A. Using narrow-spectrum antibiotics preferentially over broad-spectrum agents
- B. Rotating or diversifying antimicrobial use across a healthcare system to reduce selection pressure on specific resistance mechanisms (Correct Answer)
- C. Prescribing combination therapy to cover multiple potential pathogens
- D. Implementing therapeutic drug monitoring for all antimicrobial agents
- E. Using different antibiotic classes for empirical versus culture-directed therapy
Explanation: ***Rotating or diversifying antimicrobial use across a healthcare system to reduce selection pressure on specific resistance mechanisms*** - **Antibiotic heterogeneity** (also known as **antibiotic mixing**) is a population-level strategy designed to distribute **selection pressure** across different antibiotic classes. - By avoiding the dominance of a single drug type, the healthcare system reduces the likelihood that specific **resistance genes** will gain a competitive advantage and spread rapidly. *Using narrow-spectrum antibiotics preferentially over broad-spectrum agents* - This describes **de-escalation** or **targeted therapy**, which is a core stewardship principle but not the definition of heterogeneity. - While it reduces general pressure, it does not specifically address the **diversification** of drugs across a population. *Prescribing combination therapy to cover multiple potential pathogens* - **Combination therapy** aims to broaden empirical coverage or achieve **synergy**, rather than managing population-wide resistance patterns through diversification. - This approach is patient-specific and can sometimes lead to increased overall **antimicrobial consumption**. *Implementing therapeutic drug monitoring for all antimicrobial agents* - **Therapeutic drug monitoring (TDM)** is used to ensure individual patient safety and efficacy for drugs with **narrow therapeutic indices** like Gentamicin. - TDM relates to **pharmacokinetics** and toxicity management rather than a population-level strategy for antimicrobial diversification. *Using different antibiotic classes for empirical versus culture-directed therapy* - This describes the process of **clinical review** and narrowing therapy based on **microbiology results**. - While essential for stewardship, it focuses on individual treatment optimization rather than intentional **population-wide rotation** or mixing of agents.
Question 69: A 63-year-old woman with type 2 diabetes presents with a painful red swelling on her left thigh that has been present for 3 days. On examination, there is a 6cm area of erythema, warmth, and tenderness with central fluctuance. Her temperature is 38.2°C, heart rate 96 bpm, and blood pressure 132/78 mmHg. Blood tests show WCC 13.2 × 10⁹/L and CRP 82 mg/L. What is the most appropriate initial management?
- A. Oral flucloxacillin and warm compresses
- B. Intravenous flucloxacillin
- C. Incision and drainage with oral antibiotics (Correct Answer)
- D. Aspiration with needle and oral antibiotics
- E. Incision and drainage alone without antibiotics
Explanation: ***Incision and drainage with oral antibiotics*** - The presence of **central fluctuance** confirms a cutaneous **abscess**, for which the definitive gold-standard management is surgical **incision and drainage (I&D)**. - This patient requires **adjunctive antibiotics** in addition to drainage because of her **comorbid diabetes**, systemic symptoms (**fever**), and elevated inflammatory markers (CRP 82 mg/L). *Oral flucloxacillin and warm compresses* - Antibiotics alone are insufficient because they cannot adequately penetrate the **walled-off purulent collection** of an abscess. - Warm compresses may help a small lesion spontaneously drain, but they do not replace the need for **surgical source control** in a patient with systemic features. *Intravenous flucloxacillin* - While the patient is febrile, she is **hemodynamically stable** and tolerating oral intake, making **intravenous (IV)** therapy unnecessary unless she fails to respond to oral treatment. - Similar to oral therapy, IV antibiotics without **I&D** will fail to resolve a fluctuant abscess as the source of infection remains undrained. *Aspiration with needle and oral antibiotics* - Needle aspiration is associated with higher **recurrence rates** compared to incision and drainage because it often fails to completely evacuate the loculated pus. - **Incision and drainage** allows for thorough exploration and breakdown of any internal septations within the abscess cavity. *Incision and drainage alone without antibiotics* - While I&D alone is appropriate for small, simple abscesses, this patient has **high-risk factors** including **type 2 diabetes** and signs of systemic inflammatory response. - Guidelines suggest that **concomitant antibiotics** are necessary when significant **surrounding cellulitis** or constitutional symptoms (fever) are present.
Question 70: A hospital antimicrobial stewardship committee reviews prescribing data showing that empirical carbapenem use has increased by 35% over 12 months, primarily for intra-abdominal sepsis and complicated urinary tract infections. Which stewardship intervention would be most effective in reducing inappropriate carbapenem use while maintaining patient safety?
- A. Complete removal of carbapenems from the hospital formulary
- B. Requiring infectious diseases consultant approval for all carbapenem prescriptions with 24-hour turn-around time
- C. Implementing a clinical decision support tool with audit and feedback that prompts consideration of narrower-spectrum alternatives with clear criteria for carbapenem use (Correct Answer)
- D. Restricting carbapenem use to critical care areas only
- E. Mandatory stop orders after 48 hours requiring represcribing justification
Explanation: ***Implementing a clinical decision support tool with audit and feedback that prompts consideration of narrower-spectrum alternatives with clear criteria for carbapenem use***- This approach is highly effective as it combines **prospective audit and feedback** with real-time education, helping clinicians choose narrower agents like **piperacillin-tazobactam** when appropriate.- It balances **antibiotic stewardship** with patient safety by allowing immediate use for confirmed **ESBL infections** while mandating review based on evidence-based criteria.*Complete removal of carbapenems from the hospital formulary*- This is an extreme measure that compromises safety for patients with **multi-drug resistant (MDR)** infections that clinically require carbapenems.- Eliminating access entirely prevents the treatment of **ESBL-producing Enterobacteriaceae**, which can lead to increased mortality.*Requiring infectious diseases consultant approval for all carbapenem prescriptions with 24-hour turn-around time*- A mandatory 24-hour delay can lead to **suboptimal clinical outcomes** or death in patients presenting with **septic shock**.- While restrictive, this method creates a **barrier to timely care** and often results in high administrative burden without the educational benefit of real-time feedback.*Restricting carbapenem use to critical care areas only*- This ignores appropriate clinical indications for carbapenems on medical or surgical wards, such as stable patients with **resistant urosepsis**.- It creates a **geographic restriction** that does not account for the patient's specific microbiology or clinical complexity.*Mandatory stop orders after 48 hours requiring represcribing justification*- Mandatory stops can cause **treatment interruptions** if clinicians are unable to re-prescribe in time, potentially leading to treatment failure.- This intervention focuses on **administrative burden** rather than clinical decision-making and does not necessarily guide the prescriber toward better empirical choices at the start of therapy.
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