CST Suture & Staple Materials 3 — Questions and Answers
Question 1: Which suture is contraindicated in infected wounds due to its multifilament braided structure?
- Monocryl
- Silk (Correct answer)
- Prolene
- PDS
Correct answer: Silk
Silk's braided multifilament structure can harbor bacteria, making it contraindicated in infected or contaminated wounds.
Question 2: A circular stapler (EEA) is used primarily for which type of anastomosis?
- Skin closure
- End-to-end bowel anastomosis (Correct answer)
- Vascular repair
- Tendon repair
Correct answer: End-to-end bowel anastomosis
The end-to-end anastomosis (EEA) circular stapler creates a circumferential staple line for bowel-to-bowel reconnection.
Question 3: What is the absorption mechanism of synthetic absorbable sutures like Vicryl?
- Proteolysis by tissue enzymes
- Hydrolysis (Correct answer)
- Phagocytosis
- Oxidation
Correct answer: Hydrolysis
Synthetic absorbable sutures like Vicryl are absorbed by hydrolysis, where water breaks the polymer chains.
Question 4: Which needle body shape is best suited for suturing in deep, confined cavities?
- Straight (Keith)
- Half-curved
- 5/8 circle (Correct answer)
- 3/8 circle
Correct answer: 5/8 circle
A 5/8 circle needle requires less wrist rotation, making it ideal for deep, confined spaces like the pelvis or bladder.
Question 5: The TA (thoracoabdominal) stapler applies staples in what configuration?
- Single row
- Double staggered rows (Correct answer)
- Circular pattern
- Triple rows
Correct answer: Double staggered rows
The TA stapler applies two staggered rows of staples simultaneously to ensure a secure, hemostatic closure.
Question 6: Nylon suture (Ethilon) is classified as which type?
- Absorbable synthetic monofilament
- Non-absorbable synthetic monofilament (Correct answer)
- Non-absorbable natural multifilament
- Absorbable natural multifilament
Correct answer: Non-absorbable synthetic monofilament
Nylon (Ethilon) is a non-absorbable synthetic monofilament suture used for skin closure and microsurgery.
Question 7: What is the purpose of coating Vicryl suture with polyglactin 370 and calcium stearate?
- To increase absorption rate
- To reduce tissue drag and improve handling (Correct answer)
- To add antimicrobial properties
- To increase tensile strength
Correct answer: To reduce tissue drag and improve handling
The coating on Vicryl reduces tissue drag, allowing the suture to pass smoothly through tissue and improving knot rundown.
CST Suture & Staple Materials 3
Which suture is contraindicated in infected wounds due to its multifilament braided structure?