EssentialFRCS

Infection and sepsis

Principles of Surgery in General · 18 questions · 1 free to try

Recognising and treating sepsis to the national standard, antibiotic prophylaxis and stewardship, surgical site infection classification and prevention, necrotising soft tissue infection, Clostridioides difficile, and post-exposure and post-splenectomy prophylaxis.

Every question in this topic is a single best answer item in the style of the exam, followed by an explanation that gives the reasoning for the correct option, why each distractor is wrong, a key point to carry into the exam and, where one applies, the guideline or trial it rests on. Practice mode lets you work through the topic on its own or mixed with others; exam mode draws it into timed papers.

Sample question from this topic

A 71-year-old man on the surgical ward, day two after anterior resection, triggers a NEWS2 score of 8: temperature 38.6°C, heart rate 122/min, BP 92/58 mmHg, respiratory rate 26/min, new confusion. The ward doctor suspects sepsis. Which initial management bundle should be completed, and within what timeframe?

  1. AThe Sepsis Six within one hour: oxygen, cultures, antibiotics, fluid, serial lactates and urine output, with senior review
  2. BBlood cultures, intravenous fluids and broad-spectrum antibiotics, all completed within 24 hours of the NEWS2 trigger firing
  3. CAwait the CRP result before any antibiotics
  4. DGive antibiotics only once CT has identified the source of sepsis
  5. EParacetamol and reassessment on the next ward round
Show answer and explanation

Correct answer: A

He has sepsis with features of septic shock evolving — new organ dysfunction (confusion, hypotension) in the context of presumed infection after anastomotic surgery. The Sepsis Six operationalises the first hour: three things given (oxygen titrated to target saturations, broad-spectrum intravenous antibiotics after cultures, intravenous crystalloid), three things taken or measured (blood cultures, lactate — repeated to track clearance — and urine output monitoring, usually via catheter). Every hour of delay to effective antibiotics in septic shock measurably increases mortality, which is why antibiotics precede confirmation of a source but follow cultures where this causes no delay. Equally surgical: the bundle is the beginning, not the end — a post-operative septic patient needs senior review and an urgent search for a source amenable to control (this man needs a CT abdomen for an anastomotic leak, as antibiotics cannot sterilise undrained contamination), plus escalation to critical care if hypotension persists after fluid.

Why the others are wrong: B — 24 hours is a mortality statistic, not a timeframe; the bundle is an hour. C — CRP neither confirms nor excludes sepsis and never gates treatment. D — imaging follows resuscitation and antibiotics; treatment is not withheld pending localisation. E — antipyretics and a routine round review are the anatomy of a preventable arrest call.

Key point: Suspected sepsis with organ dysfunction triggers the Sepsis Six within one hour — oxygen, cultures, antibiotics, fluid, lactate, urine output — with senior review and urgent source-control assessment alongside; in the post-operative patient, find and drain the source.

Guidelines: UK Sepsis Trust Sepsis Six and NICE sepsis guidance: high NEWS2 with suspected infection triggers the hour-one bundle — oxygen, cultures, broad-spectrum antibiotics, fluids, lactate and urine-output monitoring — plus urgent senior surgical review for source control.

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