Diabetic Foot: Abscess Characteristics and Causes
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Questions and Answers

Which feature is NOT one of the Celsian clinical features of acute inflammation?

  • calor
  • dolor
  • fibrinogen (correct)
  • rubor

Which type of organism predominantly causes tissue necrosis and suppuration in wound abscesses?

  • Pseudomonas aeruginosa
  • Escherichia coli
  • Streptococcus pyogenes
  • Staphylococcus aureus (correct)

What does granulation tissue consist of?

  • Macrophages, angiogenesis, and fibroblasts (correct)
  • Collagen fibers and epithelial cells
  • Platelets and plasma
  • Fibrin and red blood cells

What is a common consequence of a chronic abscess?

<p>Sinus or fistula formation (A)</p> Signup and view all the answers

Which diagnostic method is usually accurate in assessing wound abscesses and may allow guided aspiration?

<p>CT scan (B)</p> Signup and view all the answers

Which statement is accurate for class I clean wounds?

<p>Skin microfloras are likely to contaminate the operative field. (D)</p> Signup and view all the answers

What is the risk of infection in class I clean wounds?

<p>1-4% (C)</p> Signup and view all the answers

Which organisms are associated with chronic abscesses and fistula formations?

<p>Mycobacteria (B)</p> Signup and view all the answers

Study Notes

Wound Management and Diabetic Foot

Characteristics of an Abscess

  • Presents with calor (heat), rubor (redness), dolor (pain), and tumour (swelling)
  • May also exhibit functio leasa (loss of function) and damage to the infected part

Causes and Composition of an Abscess

  • Caused by pyogenic organisms, mainly Staphylococcus aureus
  • Composed of pus, dead and dying white blood cells, and damaging cytokines, oxygen-free radicals, and other molecules

Formation and Resolution of an Abscess

  • Surrounded by an acute inflammatory response and a pyogenic membrane
  • Granulation tissue forms later around the suppuration, leading to collagen deposition
  • May spontaneously discharge through a surgical incision, but most take 7-9 days to form after surgery
  • May need debridement and curettage with exploration to resolve

Complications of Chronic Abscesses

  • May lead to sinus or fistula formation
  • Persistent chronic abscesses may exhibit lymphocytes and plasma cells, sequestration, and calcification
  • Certain organisms, such as mycobacteria, are related to chronicity, sinus, and fistula formation

Diagnostic Tools

  • Plain or contrast radiographs may not be helpful
  • CT scan, MRI, and isotope scans are usually accurate and may allow guided aspiration without surgical intervention

Surgical Site Infections

Classification of Surgical Wounds

  • Class I or clean wounds: low risk of infection (1-4%)
  • Class II clean contaminated wounds: slightly higher risk of infection (3-6%)
  • Classified based on potential risk of microbial contamination and whether a hollow viscous is entered

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Description

This quiz covers the characteristics, causes, and composition of abscesses in diabetic foot, including signs, symptoms, and the role of pyogenic organisms.

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