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Infections in Surgery MCQs
Q1. A chronic wound is one that fails to heal more than:
Answer: B. 3 weeks
Chronic wounds are those that don’t heal within 3 weeks. After this time, the wound typically should have shown substantial healing (new tissue forming, wound edges closing). If it hasn’t, it’s considered chronic.
Why the other options are incorrect:
A. 2 weeks: Wounds that take 2 weeks to heal aren’t necessarily chronic.
C. 4 weeks: Wounds can be chronic by 4 weeks, but the standard definition starts at 3 weeks.
D. 6 weeks: Definitely chronic, but the threshold is earlier.
Take-home Message: A chronic wound fails to heal within 3 weeks, often due to infection, poor circulation, or systemic diseases.
Chronic wounds are those that don’t heal within 3 weeks. After this time, the wound typically should have shown substantial healing (new tissue forming, wound edges closing). If it hasn’t, it’s considered chronic.
Why the other options are incorrect:
A. 2 weeks: Wounds that take 2 weeks to heal aren’t necessarily chronic.
C. 4 weeks: Wounds can be chronic by 4 weeks, but the standard definition starts at 3 weeks.
D. 6 weeks: Definitely chronic, but the threshold is earlier.
Take-home Message: A chronic wound fails to heal within 3 weeks, often due to infection, poor circulation, or systemic diseases.
Q2. Regarding Amoeboma, which statement is NOT correct?
Answer: C) Altered bowel habits most common symptom
Amoeboma is a localized mass-like lesion resulting from intestinal amoebiasis, typically caused by *Entamoeba histolytica*. It can mimic a tumor and often occurs in the caecum.
Why the other options are correct:
A) Most commonly seen in caecum: Correct.
B) It is granulomatous: Correct.
D) Seen in long-standing infection which is intermittently treated: Correct.
Why option C is incorrect: Altered bowel habits are not the hallmark of amoebomas. The most common symptom is abdominal mass or pain.
Take-home Message: Amoebomas are granulomatous lesions caused by *E. histolytica*, most often in the caecum.
Amoeboma is a localized mass-like lesion resulting from intestinal amoebiasis, typically caused by *Entamoeba histolytica*. It can mimic a tumor and often occurs in the caecum.
Why the other options are correct:
A) Most commonly seen in caecum: Correct.
B) It is granulomatous: Correct.
D) Seen in long-standing infection which is intermittently treated: Correct.
Why option C is incorrect: Altered bowel habits are not the hallmark of amoebomas. The most common symptom is abdominal mass or pain.
Take-home Message: Amoebomas are granulomatous lesions caused by *E. histolytica*, most often in the caecum.
Q3. Surgical Site Infection (SSI) in a clean contaminated wound after prophylaxis is:
Answer: A) 3%
A clean-contaminated wound occurs when the surgical procedure involves opening a viscus organ (e.g., gastrointestinal or urinary tract). The SSI rate in these wounds is typically around 3% with prophylactic antibiotics.
Why the other options are incorrect:
B) 7%: Slightly higher than expected with prophylaxis.
C) 15% and D) 25%: These are seen in contaminated or dirty wounds.
Take-home Message: For a clean-contaminated wound, prophylactic antibiotics result in a 3% SSI rate.
A clean-contaminated wound occurs when the surgical procedure involves opening a viscus organ (e.g., gastrointestinal or urinary tract). The SSI rate in these wounds is typically around 3% with prophylactic antibiotics.
Why the other options are incorrect:
B) 7%: Slightly higher than expected with prophylaxis.
C) 15% and D) 25%: These are seen in contaminated or dirty wounds.
Take-home Message: For a clean-contaminated wound, prophylactic antibiotics result in a 3% SSI rate.
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