Veterinary Surgical Principles Flashcards

A surgeon is performing a ventral midline celiotomy on a 4-year-old dog. When selecting a suture material for closure of the linea alba, which of the following characteristics is most critical for long-term incisional security?

Answer: Prolonged tensile strength retention

The linea alba is the primary holding layer for a ventral midline celiotomy and heals slowly, taking several weeks to months to regain significant strength. Therefore, the suture material used must retain its tensile strength for a prolonged period to prevent incisional herniation. Sutures like polydioxanone or polyglyconate are often chosen for this reason. Rapidly absorbing sutures are inappropriate, high memory makes knot tying difficult and less secure, and multifilament sutures can increase the risk for infection.

Which of the following sterilization methods is most appropriate for a heat-sensitive, moisture-sensitive flexible endoscope?

Answer: Ethylene oxide gas

Ethylene oxide (EtO) gas sterilization is a low-temperature process effective for items that cannot withstand the high temperatures and moisture of steam autoclaving, such as flexible endoscopes and certain plastics. Steam, dry heat, and boiling would damage the delicate components of the endoscope.

A 6-year-old cat is presented 4 hours after being bitten by a dog. The wound is a 3 cm puncture on the thorax with minimal gross contamination. The surgeon plans to lavage, debride the wound edges, and perform primary closure. How would this wound be classified?

Answer: Clean-contaminated

A clean-contaminated wound is a surgical wound where the respiratory, gastrointestinal, or urogenital tracts are entered under controlled conditions, or a traumatic wound that is recent (less than 6 hours old) and has minimal contamination. Since this is a fresh bite wound, it falls into the clean-contaminated category. A 'clean' wound is a non-traumatic, uninfected surgical incision. A 'contaminated' wound is an open, fresh, accidental wound, or a surgical wound with a major break in sterile technique. A 'dirty' wound is an old traumatic wound with retained devitalized tissue and shows signs of infection.

Which of the following is a core component of Halsted's principles of surgery, aimed at minimizing tissue trauma and promoting optimal healing?

Answer: Meticulous hemostasis

Meticulous hemostasis (controlling bleeding) is one of Halsted's foundational surgical principles. The other principles include gentle tissue handling, preservation of blood supply, strict aseptic technique, minimization of tissue tension, accurate tissue apposition, and elimination of dead space. While surgical efficiency is important, speed should not compromise careful technique. The smallest appropriate suture material should be used, and dead space should be closed with sutures, with drains used only when fluid accumulation cannot be prevented.

During an intestinal resection and anastomosis, a surgeon needs to temporarily occlude the bowel lumen proximal and distal to the surgical site to prevent leakage of contents. Which of the following instruments is designed for this purpose, causing minimal trauma to the intestinal wall?

Answer: Doyen intestinal forceps

Doyen intestinal forceps are specifically designed to be atraumatic. They have longitudinal serrations and flexible, bowed jaws that allow for temporary occlusion of the bowel lumen without crushing the tissue or compromising its blood supply. Carmalt forceps are crushing hemostats used on vessels or pedicles. Allis tissue forceps are traumatic and used for grasping tissue that will be removed. Babcock forceps are less traumatic than Allis but are for grasping and retracting, not occluding a lumen.

A dog is presented with a large, heavily contaminated wound on its flank that is 12 hours old. The veterinarian debrides the wound and places a bandage, planning to surgically close it in 4 days once granulation tissue has formed and infection is controlled. What is this type of wound closure called?

Answer: Secondary closure

Secondary closure (or tertiary intention healing) refers to the surgical closure of a wound 3-5 days or more after the initial injury, after a healthy bed of granulation tissue has formed. This is distinct from delayed primary closure (closure within 1-3 days, before granulation tissue forms) and second intention healing (allowing the wound to granulate and epithelialize on its own without surgical closure). Primary closure is the immediate suturing of a clean wound.