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SU14.2-3 | Surgical Approaches, Instruments and Wound Closure — SDL Guide (Part 3)
Check Your Understanding
Consolidate the skill by walking the whole sequence from approach to closure. Start with the incision: place an elective incision parallel to Langer's lines for the least tension and the finest scar, while giving adequate, extensible exposure and respecting nerves, vessels and the anatomical layers. Pick the instrument for each step by its family — cutting (scalpel, Mayo and Metzenbaum scissors), grasping (toothed forceps for skin/fascia, non-toothed and Babcock for delicate tissue), haemostatic clamps (artery forceps), and retractors (self-retaining or hand-held). Choose the suture on its two independent axes — absorbable versus non-absorbable for how long support lasts, and monofilament versus braided for tissue drag, knot security and infection risk — and match the needle (round-bodied for soft tissue, cutting for tough tissue) and the technique (interrupted, continuous, subcuticular or mattress) to the wound. Secure every closure with a square or surgeon's knot placed as an instrument tie, approximating and never strangling the edges. Where two hollow structures are joined, hold to the principles of anastomosis: good blood supply, no tension, accurate apposition and no distal obstruction. Self-test on five links: can you justify an incision's placement; assign an instrument to its task; classify any named suture on both axes; choose suture, needle and technique for a given tissue; and state the four anastomosis principles? The questions below check exactly these.
SELF-CHECK
Which set of conditions must ALL be satisfied for a sound bowel anastomosis?
A. Tight closure, braided suture, cutting needle, antibiotics
B. Good blood supply, no tension, accurate apposition, no distal obstruction
C. Monofilament suture, continuous technique, drain in place, low albumin
D. High tension, interrupted sutures, toothed forceps, dry field
Reveal Answer
Answer: B. Good blood supply, no tension, accurate apposition, no distal obstruction
The principles of a safe anastomosis are an adequate blood supply at both ends, a tension-free join, accurate apposition (mucosa to mucosa / layer to layer), and no obstruction distal to the anastomosis. Failure of any one of these predisposes to leakage. Tightness, suture brand and antibiotics do not substitute for these four anatomical and physiological requirements.