Empiric antimicrobial therapy US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Empiric antimicrobial therapy. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Empiric antimicrobial therapy US Medical PG Question 1: An 18-year-old female college student is brought to the emergency department by ambulance for a headache and altered mental status. The patient lives with her boyfriend who is with her currently. He states she had not been feeling well for the past day and has vomited several times in the past 12 hours. Lumbar puncture is performed in the emergency room and demonstrates an increased cell count with a neutrophil predominance and gram-negative diplococci on Gram stain. The patient is started on vancomycin and ceftriaxone. Which of the following is the best next step in management?
- A. Treat boyfriend with rifampin (Correct Answer)
- B. Add ampicillin to treatment regimen
- C. Add ampicillin, dexamethasone, and rifampin to treatment regimen
- D. Add dexamethasone to treatment regimen
- E. Treat boyfriend with ceftriaxone and vancomycin
Empiric antimicrobial therapy Explanation: ***Treat boyfriend with rifampin***
- The patient's presentation with headache, altered mental status, neutrophilic pleocytosis, and **Gram-negative diplococci** on CSF Gram stain is highly suggestive of **Neisseria meningitidis** meningitis.
- The patient is already on appropriate empiric antibiotic therapy (vancomycin and ceftriaxone), so the **immediate priority** is to prevent secondary cases through **post-exposure prophylaxis** for close contacts.
- Close contacts, including household members like the boyfriend, are at high risk of contracting the infection and should receive prophylaxis within **24 hours** of case identification, with **rifampin**, **ciprofloxacin**, or **IM ceftriaxone** being standard options.
*Add ampicillin to treatment regimen*
- Ampicillin provides coverage for **Listeria monocytogenes**, but the Gram stain demonstrating **Gram-negative diplococci** makes Listeria (Gram-positive rod) unlikely in this otherwise healthy young adult without specific risk factors for Listeria.
- The current regimen of vancomycin and ceftriaxone provides adequate empiric coverage for acute bacterial meningitis, targeting common pathogens like **S. pneumoniae** and **N. meningitidis**.
*Add ampicillin, dexamethasone, and rifampin to treatment regimen*
- While providing rifampin prophylaxis to the boyfriend is appropriate, adding it to the **patient's** treatment regimen is not indicated for her active infection.
- **Dexamethasone** is often added to reduce inflammation and neurological sequelae but should be given **prior to or concurrently** with the first dose of antibiotics; adding it later in the course may not be as beneficial.
- This option conflates treatment of the patient with prophylaxis of contacts.
*Add dexamethasone to treatment regimen*
- Dexamethasone is recommended in adults with suspected pneumococcal meningitis to reduce mortality and neurological sequelae, but ideal administration is **prior to or with the first dose of antibiotics**.
- While it might still be considered, the priority given the **Gram-negative diplococci** (suggesting N. meningitidis rather than S. pneumoniae) is **contact prophylaxis** to prevent further spread, and the timing for optimal dexamethasone benefit has likely passed.
*Treat boyfriend with ceftriaxone and vancomycin*
- Ceftriaxone and vancomycin are appropriate for treating the patient's active meningitis, but they are not the standard or preferred agents for **post-exposure prophylaxis** in contacts.
- Post-exposure prophylaxis typically involves a short course of agents like **rifampin**, **ciprofloxacin**, or a single dose of **intramuscular ceftriaxone**, primarily to eradicate nasopharyngeal carriage and prevent transmission.
Empiric antimicrobial therapy US Medical PG Question 2: A 22-year-old female is brought to the emergency department by her roommate with a one day history of fever and malaise. She did not feel well after class the previous night and has been in her room since then. She has not been eating or drinking due to severe nausea. Her roommate checked on her one hour ago and was alarmed to find a fever of 102°F (38.9°C). On physical exam temperature is 103°F (40°C), blood pressure is 110/66 mmHg, pulse is 110/min, respirations are 23/min, and pulse oximetry is 98% on room air. She refuses to move her neck and has a rash on her trunk. You perform a lumbar puncture and the CSF analysis is shown below.
Appearance: Cloudy
Opening pressure: 180 mm H2O
WBC count: 150 cells/µL (93% PMN)
Glucose level: < 40 mg/dL
Protein level: 50 mg/dL
Gram stain: gram-negative diplococci
Based on this patient's clinical presentation, which of the following should most likely be administered?
- A. Ceftriaxone (Correct Answer)
- B. Dexamethasone
- C. Rifampin
- D. Acyclovir
- E. Erythromycin
Empiric antimicrobial therapy Explanation: ***Ceftriaxone***
- The patient presents with classic signs of **bacterial meningitis** (fever, neck stiffness, rash, altered mental status) and CSF analysis confirms, showing **cloudy appearance**, **elevated opening pressure**, **high WBC count with PMN predominance**, **low glucose**, and **gram-negative diplococci** on Gram stain, typical for *Neisseria meningitidis*.
- **Ceftriaxone** is a third-generation cephalosporin, a first-line antibiotic for treating bacterial meningitis, particularly effective against *Neisseria meningitidis*.
*Dexamethasone*
- While **dexamethasone** can be used as an adjunct in bacterial meningitis, particularly when caused by *Streptococcus pneumoniae*, it's administered *before or with* the first dose of antibiotics to mitigate inflammation.
- It is not the primary treatment to *eradicate* the infection and is less critical than immediate antibiotic therapy.
*Rifampin*
- **Rifampin** is primarily used for chemoprophylaxis in close contacts of individuals with meningococcal meningitis, or as part of a multi-drug regimen for tuberculosis.
- It is not the recommended first-line monotherapy for acute bacterial meningitis.
*Acyclovir*
- **Acyclovir** is an antiviral medication used to treat herpes simplex virus (HSV) meningitis or encephalitis.
- The CSF analysis showing **gram-negative diplococci** clearly indicates a bacterial etiology, not viral, making acyclovir inappropriate.
*Erythromycin*
- **Erythromycin** is a macrolide antibiotic with a narrower spectrum of activity and is not typically used as first-line treatment for bacterial meningitis, especially not for *Neisseria meningitidis*.
- Its use is often limited by resistance and side effects compared to third-generation cephalosporins.
Empiric antimicrobial therapy US Medical PG Question 3: A 59-year-old woman comes to the emergency department because of a 2-day history of worsening fever, chills, malaise, productive cough, and difficulty breathing. Three days ago, she returned from a trip to South Africa. She has type 2 diabetes mellitus, hypertension, and varicose veins. Her current medications include metformin, lisinopril, and atorvastatin. Her temperature is 39.4°C (102.9°F), pulse is 102/minute, blood pressure is 94/68 mm Hg, and respirations are 31/minute. Pulse oximetry on 2 L of oxygen via nasal cannula shows an oxygen saturation of 91%. Examination reveals decreased breath sounds and dull percussion over the left lung base. The skin is very warm and well-perfused. The remainder of the examination shows no abnormalities. Laboratory studies show:
Hemoglobin 11.6 g/dL
Leukocyte count 15,400/mm3
platelet count 282,000/mm3
Serum
Na+ 144 mEq/L
Cl- 104 mEq/L
K+ 4.9 mEq/L
Creatinine 1.5 mg/dL
Blood and urine for cultures are obtained. Intravenous fluid resuscitation is begun. Which of the following is the next best step in management?
- A. Erythromycin
- B. Intravenous ceftriaxone and azithromycin (Correct Answer)
- C. External cooling and intravenous acetaminophen
- D. Intravenous vancomycin and ceftriaxone
- E. CT of the chest with contrast
Empiric antimicrobial therapy Explanation: ***Intravenous ceftriaxone and azithromycin***
* This patient presents with **severe community-acquired pneumonia (CAP)** meeting criteria for ICU-level care, including hypotension (94/68 mm Hg), hypoxemia requiring supplemental oxygen, tachypnea (31/min), and altered mental status indicators. The presentation meets multiple **severe CAP criteria** (CURB-65 score ≥3 or IDSA/ATS major criteria).
* **Intravenous ceftriaxone** (a third-generation cephalosporin) provides broad-spectrum coverage against common bacterial causes of CAP, including *Streptococcus pneumoniae* and *Haemophilus influenzae*. **Azithromycin** (a macrolide) is crucial to cover atypical pathogens like *Mycoplasma pneumoniae*, *Chlamydophila pneumoniae*, and *Legionella pneumoniae*.
* This combination represents the **standard empiric therapy for severe CAP** per IDSA/ATS guidelines. The patient's recent travel to South Africa and severe symptoms increase the likelihood of atypical pathogens or resistant strains, making dual therapy essential.
*Erythromycin*
* While erythromycin is a macrolide that covers atypical pathogens, its use is generally limited due to higher rates of gastrointestinal side effects and a less favorable dosing profile compared to newer macrolides like azithromycin. It does not provide adequate coverage for typical bacterial causes of CAP.
* In severe CAP with signs of sepsis, monotherapy with erythromycin would be insufficient and would not address the need for broad-spectrum coverage against both typical and atypical bacteria. Dual antibiotic therapy is required for severe cases.
*External cooling and intravenous acetaminophen*
* These interventions are appropriate for **fever reduction** but do not address the underlying severe infection (pneumonia with sepsis). While important for symptomatic relief, they are not the "next best step in management" for a life-threatening condition.
* Treating the infection with appropriate antibiotics is paramount to prevent further deterioration and organ damage. In severe sepsis from pneumonia, **source control through antimicrobial therapy takes precedence** over symptomatic fever management.
*Intravenous vancomycin and ceftriaxone*
* **Vancomycin** is primarily used to cover **methicillin-resistant *Staphylococcus aureus* (MRSA)**. While MRSA can cause severe pneumonia, there are no specific risk factors for MRSA in this patient (e.g., recent hospitalization, IV drug use, prior MRSA infection, severe influenza, cavitary lesions, hemoptysis).
* Adding vancomycin without specific indications for MRSA coverage would represent unnecessary broad-spectrum antibiotic use and could contribute to antibiotic resistance. The combination of **ceftriaxone and azithromycin is the standard empiric therapy** for severe CAP without MRSA risk factors.
*CT of the chest with contrast*
* A CT scan of the chest might be useful for further characterizing the pneumonia, identifying complications (e.g., empyema, abscess), or differentiating from other conditions **after initial stabilization**. However, in a patient with severe pneumonia, hypoxemia, and hypotension, the immediate priority is stabilization and initiation of empiric antibiotic therapy.
* Delaying life-saving antibiotic treatment to obtain a CT scan could worsen the patient's prognosis and violate the principle of **early appropriate antibiotics in sepsis** (ideally within 1 hour). Clinical diagnosis with chest X-ray is sufficient to initiate treatment, and further imaging can be obtained after stabilization if needed.
Empiric antimicrobial therapy US Medical PG Question 4: Five days after being admitted to the hospital for a scald wound, a 2-year-old boy is found to have a temperature of 40.2°C (104.4°F). He does not have difficulty breathing, cough, or painful urination. He initially presented one hour after spilling a pot of boiling water on his torso while his mother was cooking dinner. He was admitted for fluid resuscitation, nutritional support, pain management, and wound care, and he was progressing well until today. He has no other medical conditions. Other than analgesia during this hospital stay, he does not take any medications. He appears uncomfortable but not in acute distress. His pulse is 150/min, respirations are 41/min, and blood pressure is 90/50 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 99%. Examination shows uneven, asymmetrical scalding covering his anterior torso in arrow-like patterns with surrounding erythema and purulent discharge. The remainder of the examination shows no abnormalities. His hemoglobin is 13.4 g/dL, platelet count is 200,000/mm3, and leukocyte count is 13,900/mm3. Which of the following is the most appropriate initial pharmacological treatment for this patient?
- A. Vancomycin and metronidazole
- B. Amoxicillin/clavulanic acid and ceftriaxone
- C. Ampicillin/sulbactam and daptomycin
- D. Vancomycin and cefepime (Correct Answer)
- E. Piperacillin/tazobactam and cefepime
Empiric antimicrobial therapy Explanation: ***Vancomycin and cefepime***
- The patient presents with classic signs of **burn wound infection**, including fever, purulent discharge, and a rapid pulse, necessitating broad-spectrum antibiotic coverage.
- **Vancomycin** provides excellent coverage against **MRSA (methicillin-resistant *Staphylococcus aureus*)**, a common pathogen in burn infections, while **cefepime** covers **gram-negative bacteria**, including *Pseudomonas aeruginosa*, which is also frequently implicated.
*Vancomycin and metronidazole*
- While vancomycin covers gram-positive bacteria like **MRSA**, **metronidazole** primarily targets **anaerobic bacteria**, which are less common as primary pathogens in burn wound infections.
- This combination lacks adequate coverage for crucial gram-negative bacteria such as *Pseudomonas aeruginosa*.
*Amoxicillin/clavulanic acid and ceftriaxone*
- This combination provides coverage against some common community-acquired pathogens but is insufficient for the broad-spectrum needs of a severe **hospital-acquired burn infection**.
- It lacks reliable coverage for **MRSA** and *Pseudomonas aeruginosa*, which are critical in this setting.
*Ampicillin/sulbactam and daptomycin*
- **Ampicillin/sulbactam** covers some gram-positive and gram-negative bacteria but would not reliably cover **MRSA** or *Pseudomonas aeruginosa*.
- **Daptomycin** is effective against gram-positive bacteria, including **MRSA**, but does not cover gram-negative pathogens, leaving a significant gap in treatment.
*Piperacillin/tazobactam and cefepime*
- Both **piperacillin/tazobactam** and **cefepime** are excellent broad-spectrum antibiotics covering gram-negative pathogens, including *Pseudomonas aeruginosa*, but are largely redundant in this combination.
- This regimen lacks specific coverage for **MRSA**, which is a significant concern in nosocomial burn wound infections.
Empiric antimicrobial therapy US Medical PG Question 5: Three days after admission to the hospital following a motor vehicle accident, a 45-year-old woman develops a fever. A central venous catheter was placed on the day of admission for treatment of severe hypotension. Her temperature is 39.2°C (102.5°F). Examination shows erythema surrounding the catheter insertion site at the right internal jugular vein. Blood cultures show gram-positive, catalase-positive cocci that have a high minimum inhibitory concentration when exposed to novobiocin. Which of the following is the most appropriate pharmacotherapy?
- A. Clarithromycin
- B. Vancomycin (Correct Answer)
- C. Metronidazole
- D. Penicillin G
- E. Polymyxin B
Empiric antimicrobial therapy Explanation: ***Vancomycin***
- The description of **gram-positive, catalase-positive cocci** that are **novobiocin-resistant** (high MIC) strongly points to **Staphylococcus epidermidis** or other coagulase-negative staphylococci. *S. epidermidis* is the most common cause of **catheter-related bloodstream infections** and is often **methicillin-resistant**, making **vancomycin** the drug of choice.
- The presence of erythema at the catheter site and fever in a patient with a central venous catheter indicates a **central line-associated bloodstream infection (CLABSI)**, for which empiric coverage with vancomycin is standard until sensitivities are known.
- The novobiocin resistance test helps differentiate *S. epidermidis* (resistant) from *S. saprophyticus* (sensitive).
*Clarithromycin*
- **Clarithromycin** is a macrolide antibiotic primarily used for respiratory tract infections and *Mycobacterium avium complex*.
- It is **not effective** against methicillin-resistant staphylococci and would not be appropriate for a suspected CLABSI.
*Metronidazole*
- **Metronidazole** is an antibiotic mainly used for **anaerobic bacterial infections** and certain parasitic infections.
- It has **no activity** against gram-positive cocci like staphylococci.
*Penicillin G*
- **Penicillin G** is a narrow-spectrum penicillin effective against some gram-positive cocci, like **Streptococcus pyogenes**.
- However, virtually all staphylococci, especially those causing hospital-acquired infections, are **resistant to penicillin G** due to beta-lactamase (penicillinase) production.
*Polymyxin B*
- **Polymyxin B** is an antibiotic primarily effective against **gram-negative bacteria**, particularly those with multi-drug resistance such as **Pseudomonas aeruginosa** and **Acinetobacter baumannii**.
- It has **no significant activity** against gram-positive cocci like staphylococci.
Empiric antimicrobial therapy US Medical PG Question 6: A 62-year-old man is brought to the emergency department from a senior-care facility after he was found with a decreased level of consciousness and fever. His personal history is relevant for colorectal cancer that was managed with surgical excision of the tumor. Upon admission, he is found to have a blood pressure of 130/80 mm Hg, a pulse of 102/min, a respiratory rate of 20/min, and a body temperature 38.8°C (101.8°F). There is no rash on physical examination; he is found to have neck rigidity, confusion, and photophobia. There are no focal neurological deficits. A head CT is normal without mass or hydrocephalus. A lumbar puncture was performed and cerebrospinal fluid (CSF) is sent to analysis while ceftriaxone and vancomycin are started. Which of the following additional antimicrobials should be added in the management of this patient?
- A. Trimethoprim-sulfamethoxazole (TMP-SMX)
- B. Ampicillin (Correct Answer)
- C. Amphotericin
- D. Meropenem
- E. Clindamycin
Empiric antimicrobial therapy Explanation: ***Ampicillin***
- This patient is a 62-year-old, indicating an increased risk for **Listeria monocytogenes** meningitis, which is typically susceptible to ampicillin.
- Given his age and presentation with **meningeal signs** and fever, empirical coverage for Listeria with ampicillin is crucial, especially before CSF culture results are known.
*Trimethoprim-sulfamethoxazole (TMP-SMX)*
- While TMP-SMX can cover Listeria, it is generally considered a **second-line agent** for severe infections like meningitis due to slower bactericidal activity and potential for higher rates of treatment failure compared to ampicillin.
- Ampicillin is the **preferred first-line treatment** for Listeria meningitis unless there is a specific contraindication.
*Amphotericin*
- Amphotericin is an **antifungal agent** used for fungal meningitis.
- Although fungemia can occur in immunocompromised individuals or those with indwelling catheters, the initial presentation with bacterial meningitis symptoms and absence of specific risk factors for fungal infection do not support its empirical use.
*Meropenem*
- Meropenem is a **carbapenem** with a broad spectrum of activity, including many gram-negative and gram-positive bacteria, and some anaerobes.
- While it has good CNS penetration and could cover some organisms like penicillin-resistant S. pneumoniae or gram-negative rods, it is not the primary empirical choice specifically for **Listeria monocytogenes**, and there's no indication for its broad-spectrum coverage over standard empirical therapy currently.
*Clindamycin*
- Clindamycin is primarily active against **gram-positive bacteria**, especially anaerobes and some staphylococci and streptococci.
- It has **poor penetration into the CNS** and is therefore not effective for meningitis treatment, especially for common bacterial pathogens or Listeria.
Empiric antimicrobial therapy US Medical PG Question 7: A 38-year-old previously healthy woman develops septic shock from necrotizing fasciitis of the lower extremity. Despite three debridements, broad-spectrum antibiotics (vancomycin, meropenem, clindamycin), IVIG, and aggressive critical care support, she develops refractory shock requiring norepinephrine 1.2 mcg/kg/min, vasopressin 0.04 units/min, and epinephrine 0.1 mcg/kg/min. Lactate is 15 mmol/L. Surgical team recommends hemipelvectomy as last option for source control. Family is devastated. ICU team notes SOFA score of 18. Synthesize an approach to management and decision-making.
- A. Transfer to ECMO center for consideration of VA-ECMO as bridge to hemipelvectomy
- B. Multidisciplinary meeting with surgery, ICU, palliative care, and family to discuss realistic outcomes, quality of life, and patient values before decision (Correct Answer)
- C. Continue medical management for 24 hours and proceed with hemipelvectomy only if shock improves
- D. Decline surgery based on futility given SOFA score >15 and initiate comfort care
- E. Proceed with hemipelvectomy immediately as only chance for survival with informed consent from family
Empiric antimicrobial therapy Explanation: ***Multidisciplinary meeting with surgery, ICU, palliative care, and family to discuss realistic outcomes, quality of life, and patient values before decision***
- In high-acuity cases with refractory shock and high **SOFA scores (>15)**, shared decision-making is essential to align surgical intervention with the patient’s **goals of care**.
- This approach ensures that the **prognosis**, which carries a high risk of mortality and morbidity from **hemipelvectomy**, is transparently communicated by the entire medical team.
*Transfer to ECMO center for consideration of VA-ECMO as bridge to hemipelvectomy*
- **VA-ECMO** is generally not indicated in septic shock with refractory vasoplegia and severe multi-organ failure as it doesn't solve the **source control** issue.
- The logistics and physiological stress of a transfer in the setting of **1.2 mcg/kg/min norepinephrine** would be highly unstable and likely fatal.
*Continue medical management for 24 hours and proceed with hemipelvectomy only if shock improves*
- Delaying source control in **necrotizing fasciitis** while shock is worsening usually leads to death, as medical management alone cannot overcome the focus of infection.
- Waiting for improvement in the setting of a **lactate of 15 mmol/L** and triple vasopressors is unrealistic without definitive surgical intervention.
*Decline surgery based on futility given SOFA score >15 and initiate comfort care*
- While the **SOFA score** indicates a very high mortality risk, unilateral physician declaration of **medical futility** is ethically complex and can damage family trust.
- Comfort care should remain a possibility, but first requires a thorough **interdisciplinary discussion** to ensure legal and ethical standards are met.
*Proceed with hemipelvectomy immediately as only chance for survival with informed consent from family*
- Performing such a **mutilating surgery** without a detailed discussion of the expected **quality of life** and long-term functional loss is poor surgical practice.
- Immediate surgery without addressing the massive **operative mortality** risk ignores the patient's potential preference for a dignified death over a futile procedure.
Empiric antimicrobial therapy US Medical PG Question 8: A 52-year-old woman with septic shock from intra-abdominal infection undergoes emergency exploratory laparotomy for perforated diverticulitis with fecal peritonitis. Surgery reveals extensive contamination requiring damage control approach. Postoperatively, she requires norepinephrine 0.8 mcg/kg/min plus vasopressin 0.04 units/min, has lactate of 8.5 mmol/L, temperature 35.2°C, INR 2.8, pH 7.18, and base deficit -12. Planned return to OR is in 48 hours. Evaluate the priority interventions to optimize outcome.
- A. Immediate return to OR for definitive repair and anastomosis
- B. Start therapeutic hypothermia and delay reoperation until hemodynamically stable off vasopressors
- C. Initiate high-dose vasopressors to maintain MAP >75 mmHg and early enteral nutrition
- D. Administer massive transfusion protocol and emergency re-exploration within 6 hours
- E. Aggressive rewarming, correction of coagulopathy, ongoing resuscitation, and source control at planned reoperation (Correct Answer)
Empiric antimicrobial therapy Explanation: ***Aggressive rewarming, correction of coagulopathy, ongoing resuscitation, and source control at planned reoperation***
- This patient presents with the **lethal triad** (coagulopathy, acidosis, and hypothermia) in the setting of **septic shock**, necessitating physiologic stabilization before definitive surgery.
- The gold standard for **damage control** is to stabilize the patient in the ICU by correcting **base deficit**, improving **lactate clearance**, and restoring normal temperature and coagulation parameters.
*Immediate return to OR for definitive repair and anastomosis*
- Attempting **definitive repair** or anastomosis in an unstable patient with fecal peritonitis and high-dose **vasopressor requirements** carries a prohibited risk of dehiscence and death.
- Surgery should be limited to **staged re-intervention** only after the metabolic and physiologic insults have been partially reversed.
*Start therapeutic hypothermia and delay reoperation until hemodynamically stable off vasopressors*
- **Hypothermia** is a component of the lethal triad that worsens **coagulopathy** by inhibiting the clotting cascade; metabolic rewarming is required, not cooling.
- While stability is the goal, waiting to be completely off vasopressors might dangerously delay **source control** if the infection is driving the shock.
*Initiate high-dose vasopressors to maintain MAP >75 mmHg and early enteral nutrition*
- Focus should be on **volume resuscitation** and reversing tissue hypoxia (lactate) rather than solely escalating vasopressors, which can cause **mesenteric ischemia**.
- **Early enteral nutrition** is contraindicated in the immediate postoperative phase of an open abdomen with significant **hemodynamic instability** and high pressor requirements.
*Administer massive transfusion protocol and emergency re-exploration within 6 hours*
- **Massive transfusion protocol** is typically reserved for active, uncontrolled hemorrhage, whereas this patient primarily requires reversal of **septic shock** and metabolic derangements.
- **Re-exploration within 6 hours** is too early for a damage control patient who has not yet been adequately rewarmed or had their **acidosis** corrected.
Empiric antimicrobial therapy US Medical PG Question 9: A 70-year-old man with recently diagnosed small cell lung cancer presents with septic shock from pneumonia. After initial resuscitation, he requires norepinephrine 0.6 mcg/kg/min and has a lactate of 7.8 mmol/L. His SOFA score is 14. The family requests 'everything be done,' but the patient had previously told his oncologist he would not want prolonged intensive care if his cancer prognosis was poor. Staging shows extensive-stage disease. The ICU team debates goals of care. What represents the most ethically appropriate approach to decision-making?
- A. Continue maximum therapy per family wishes as they are legal decision-makers
- B. Obtain ethics consultation to overrule family wishes based on futility
- C. Arrange urgent palliative care consultation and family meeting to discuss patient's previously expressed wishes and realistic prognosis (Correct Answer)
- D. Continue current therapy for 72 hours then reassess based on clinical trajectory
- E. Transition to comfort care based on poor oncologic prognosis and high SOFA score
Empiric antimicrobial therapy Explanation: ***Arrange urgent palliative care consultation and family meeting to discuss patient's previously expressed wishes and realistic prognosis***
- The most ethically sound approach is to use **substituted judgment**, which prioritizes the patient's **previously expressed wishes** about avoiding prolonged intensive care.
- A **multidisciplinary family meeting** helps reconcile medical reality with patient values, ensuring informed **shared decision-making** rather than a unilateral or discordant approach.
*Continue maximum therapy per family wishes as they are legal decision-makers*
- While families are **surrogate decision-makers**, their role is to advocate for what the **patient would want**, not their own personal desires.
- Blindly following "everything be done" ignores the patient's prior statement to his oncologist and risks providing **non-beneficial treatment**.
*Obtain ethics consultation to overrule family wishes based on futility*
- The term **medical futility** is often controversial; ethics consultations are designed to **mediate conflicts** rather than simply provide a mechanism to overrule families.
- Unilateral decisions should only follow exhaustive attempts at **communication and mediation**, which have not yet occurred in this case.
*Continue current therapy for 72 hours then reassess based on clinical trajectory*
- A "time-limited trial" is a valid tool but fails to address the immediate ethical conflict regarding the **patient's autonomous refusal** of prolonged care.
- This approach may unnecessarily prolong the dying process and ignore the **prognostic alignment** required between the oncology and ICU teams.
*Transition to comfort care based on poor oncologic prognosis and high SOFA score*
- Clinicians should not unilaterally transition to **comfort care** without discussing the patient's prognosis and values with the family/surrogates first.
- While the **high SOFA score** and extensive cancer indicate a poor prognosis, the process must respect the legal and ethical requirements of **informed consent and withdrawal of care**.
Empiric antimicrobial therapy US Medical PG Question 10: A 63-year-old man with septic shock from pneumonia has been on mechanical ventilation for 48 hours. He received 6 liters of crystalloid in the first 24 hours and requires norepinephrine 0.25 mcg/kg/min to maintain MAP of 68 mmHg. Physical examination shows bilateral crackles, jugular venous distension, and 2+ pitting edema. Chest X-ray shows bilateral infiltrates and pulmonary edema. PaO2/FiO2 ratio is 180. CVP is 16 mmHg. What is the most appropriate fluid management strategy at this point?
- A. Continue maintenance fluids at 100 mL/hr and reassess in 24 hours
- B. Increase crystalloid rate to 150 mL/hr to maintain adequate CVP
- C. Initiate conservative fluid strategy with diuresis once shock has resolved (Correct Answer)
- D. Start continuous renal replacement therapy for fluid removal
- E. Administer additional 1-liter fluid bolus to improve oxygen delivery
Empiric antimicrobial therapy Explanation: ***Initiate conservative fluid strategy with diuresis once shock has resolved***
- The **FACTT trial** demonstrated that a **conservative fluid strategy** in patients with **ARDS** reduces ventilator days and improves lung function without increasing non-pulmonary organ failure.
- This patient shows clear signs of **fluid overload** (pulmonary edema, elevated CVP, and 2+ edema); thus, negative fluid balance is indicated once hemodynamic stability/vasopressor weaning begins.
*Continue maintenance fluids at 100 mL/hr and reassess in 24 hours*
- Continuing maintenance fluids in the setting of **volume overload** (distended jugular veins, crackles) exacerbates **pulmonary edema** and potentially worsens the **PaO2/FiO2 ratio**.
- A protocolized approach to achieving a neutral or negative fluid balance is preferred over passive observation once the initial resuscitation phase is complete.
*Increase crystalloid rate to 150 mL/hr to maintain adequate CVP*
- Using a **CVP** target of 16 mmHg is physiologically inappropriate, as a high CVP increases **hydrostatic pressure** in the lungs, worsening gas exchange in **ARDS**.
- High fluid infusion rates during the **de-escalation phase** of shock are associated with increased mortality and prolonged mechanical ventilation.
*Start continuous renal replacement therapy for fluid removal*
- **CRRT** is an invasive procedure indicated for refractory volume overload or severe **acute kidney injury (AKI)** associated with uremia or electrolyte imbalances.
- It is not the first-line therapy for fluid management if the patient is hemodynamically stable enough to tolerate **pharmacological diuresis** (e.g., loop diuretics).
*Administer additional 1-liter fluid bolus to improve oxygen delivery*
- Large fluid boluses at this stage would worsen **lung compliance** and oxygenation by increasing **extravascular lung water**.
- The patient already has a high **CVP (16 mmHg)** and signs of congestion, indicating that further fluid will not increase cardiac output but will worsen **interstitial edema**.
More Empiric antimicrobial therapy US Medical PG questions available in the OnCourse app. Practice MCQs, flashcards, and get detailed explanations.
