Sepsis And Severe Infection
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USMLE Step 2 CK › Sepsis And Severe Infection
History: A 46-year-old man presents with severe epigastric pain radiating to the back and fever. He has a history of gallstones.
Vital signs: T 38.7°C (101.7°F), HR 120/min, BP 92/58 mm Hg, RR 24/min.
Physical exam: He is ill-appearing. Abdomen is tender in the epigastrium with guarding.
Labs: WBC 18,300/mm³, lactate 3.6 mmol/L, total bilirubin 4.2 mg/dL, alkaline phosphatase 320 U/L.
Imaging: Right upper quadrant ultrasound shows dilated common bile duct with a stone.
Clinical decision point: He has suspected ascending cholangitis with sepsis.
Question: Which intervention is crucial for source control in this scenario?
Treat pain only and observe for spontaneous stone passage
Urgent endoscopic retrograde cholangiopancreatography for biliary decompression
Start oral ursodeoxycholic acid to dissolve gallstones
Order magnetic resonance cholangiopancreatography before any intervention
Schedule elective cholecystectomy after completing antibiotics
Explanation
This question tests critical care skills in managing sepsis and severe infections. Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Early recognition and management are crucial to improve outcomes. In the presented scenario, the patient's symptoms and lab findings suggest sepsis, highlighting the need for rapid intervention. Choice B is correct because it aligns with the guidelines for initial sepsis management, emphasizing the importance of biliary decompression via ERCP in cholangitis. Choice A is incorrect because it reflects a common misconception, such as delaying intervention for elective surgery. To help students: Emphasize the importance of early recognition and rapid intervention in sepsis. Teach prioritization of interventions and the use of current guidelines. Encourage practice with clinical scenarios to improve decision-making.
History: A 56-year-old man with pancreatitis 3 weeks ago presents with fever and worsening abdominal pain. He has early satiety and nausea.
Vital signs: T 38.6°C (101.5°F), HR 118/min, BP 90/58 mm Hg, RR 22/min.
Physical exam: Abdomen is tender in the epigastrium.
Labs: WBC 17,400/mm³, lactate 3.4 mmol/L.
Imaging: Computed tomography of the abdomen shows a 9-cm walled-off fluid collection with gas bubbles consistent with infected pancreatic necrosis.
Clinical decision point: He has sepsis from an infected pancreatic collection.
Question: Which intervention is crucial for source control in this scenario?
Perform percutaneous or endoscopic drainage with step-up necrosectomy if needed
Start oral pancreatic enzymes and low-fat diet only
Continue antibiotics alone because drainage increases fistula risk
Give high-dose corticosteroids to reduce pancreatic inflammation
Repeat computed tomography in 72 hours before any intervention
Explanation
This question tests critical care skills in managing sepsis and severe infections. Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Early recognition and management are crucial to improve outcomes. In the presented scenario, the patient's symptoms and lab findings suggest sepsis, highlighting the need for rapid intervention. Choice B is correct because it aligns with the guidelines for initial sepsis management, emphasizing the importance of drainage with step-up approach for infected necrosis. Choice A is incorrect because it reflects a common misconception, such as avoiding drainage to prevent fistulas, which delays source control. To help students: Emphasize the importance of early recognition and rapid intervention in sepsis. Teach prioritization of interventions and the use of current guidelines. Encourage practice with clinical scenarios to improve decision-making.
History: A 78-year-old woman with chronic obstructive pulmonary disease and hypertension presents with 2 days of productive cough, fever, and worsening shortness of breath. She is brought from a nursing facility.
Vital signs: T 38.8°C (101.8°F), HR 118/min, BP 82/48 mm Hg, RR 30/min, SpO2 88% on 4 L/min nasal cannula.
Physical exam: She is lethargic and using accessory muscles. Lung exam shows crackles over the right lower lobe. Skin is mottled; capillary refill is 4 seconds.
Labs: WBC 22,000/mm³, lactate 5.0 mmol/L, creatinine 1.9 mg/dL (baseline 1.0), arterial blood gas shows pH 7.30, PaCO2 32 mm Hg, PaO2 58 mm Hg on supplemental oxygen.
Imaging: Chest radiograph shows right lower lobe consolidation. Two sets of blood cultures are drawn and sputum is sent for Gram stain.
Clinical decision point: She remains hypotensive after receiving 2 liters of lactated Ringer solution in the emergency department.
Question: What is the next best step in managing this patient's shock?
Start norepinephrine infusion and titrate to maintain mean arterial pressure at least 65 mm Hg
Begin dopamine infusion as first-line vasopressor due to bradycardia risk
Administer another 4 liters of isotonic crystalloid before starting vasopressors
Delay vasopressors until central venous pressure is measured with a pulmonary artery catheter
Give intravenous sodium bicarbonate to correct lactic acidosis before pressors
Explanation
This question tests critical care skills in managing sepsis and severe infections. Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Early recognition and management are crucial to improve outcomes. In the presented scenario, the patient's symptoms and lab findings suggest sepsis, highlighting the need for rapid intervention. Choice B is correct because it aligns with the guidelines for initial sepsis management, emphasizing the importance of vasopressor therapy with norepinephrine after initial fluid resuscitation. Choice C is incorrect because it reflects a common misconception, such as preferring dopamine as first-line, which is not recommended due to arrhythmia risks. To help students: Emphasize the importance of early recognition and rapid intervention in sepsis. Teach prioritization of interventions and the use of current guidelines. Encourage practice with clinical scenarios to improve decision-making.
History: A 67-year-old man with diabetes presents with fever and back pain for 1 week. He now has hypotension and confusion.
Vital signs: T 39.1°C (102.4°F), HR 124/min, BP 86/52 mm Hg, RR 22/min.
Physical exam: He has lumbar spine tenderness. Neurologic exam shows mild bilateral leg weakness.
Labs: WBC 21,400/mm³, lactate 4.2 mmol/L.
Imaging: Magnetic resonance imaging of the spine shows an epidural abscess compressing the thecal sac.
Clinical decision point: He has sepsis with neurologic deficits from spinal epidural abscess.
Question: Which intervention is crucial for source control in this scenario?
Delay surgery until blood cultures identify the organism
Urgent surgical decompression and drainage plus intravenous antibiotics
Provide analgesia and schedule outpatient neurosurgery follow-up
Treat with oral antibiotics only because surgery increases infection spread
Start intravenous steroids only to reduce spinal cord edema
Explanation
This question tests critical care skills in managing sepsis and severe infections. Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Early recognition and management are crucial to improve outcomes. In the presented scenario, the patient's symptoms and lab findings suggest sepsis, highlighting the need for rapid intervention. Choice B is correct because it aligns with the guidelines for initial sepsis management, emphasizing the importance of urgent surgical decompression in epidural abscess with deficits. Choice A is incorrect because it reflects a common misconception, such as using oral antibiotics for deep spinal infections. To help students: Emphasize the importance of early recognition and rapid intervention in sepsis. Teach prioritization of interventions and the use of current guidelines. Encourage practice with clinical scenarios to improve decision-making.
History: A 32-year-old man with no past medical history presents with fever, headache, and photophobia for 12 hours. He is confused on arrival.
Vital signs: T 39.5°C (103.1°F), HR 130/min, BP 86/50 mm Hg, RR 24/min.
Physical exam: Nuchal rigidity is present. He has a petechial rash on the trunk.
Labs: WBC 20,500/mm³, lactate 4.7 mmol/L, platelets 85,000/mm³.
Imaging: Noncontrast head computed tomography shows no mass effect. Blood cultures are drawn.
Clinical decision point: Meningococcemia with septic shock is suspected.
Question: What is the most appropriate initial management for this patient?
Start intravenous ceftriaxone immediately and give aggressive isotonic crystalloid resuscitation
Delay antibiotics until rash biopsy confirms the organism
Perform lumbar puncture first, then start antibiotics after cerebrospinal fluid results return
Give intravenous acyclovir only because viral meningitis is most likely
Start oral amoxicillin and observe in the emergency department
Explanation
This question tests critical care skills in managing sepsis and severe infections. Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Early recognition and management are crucial to improve outcomes. In the presented scenario, the patient's symptoms and lab findings suggest sepsis, highlighting the need for rapid intervention. Choice B is correct because it aligns with the guidelines for initial sepsis management, emphasizing the importance of immediate antibiotics and resuscitation in suspected meningococcemia. Choice A is incorrect because it reflects a common misconception, such as delaying antibiotics for LP results in unstable patients. To help students: Emphasize the importance of early recognition and rapid intervention in sepsis. Teach prioritization of interventions and the use of current guidelines. Encourage practice with clinical scenarios to improve decision-making.