3.1 Surgical Wound Dressings

The application of surgical wound dressings is a critical postoperative procedure that directly influences wound healing, infection prevention, and patient comfort. As a Certified Surgical First Assistant (CSFA), you must understand the diverse array of dressing materials available and the specific clinical indications for each. Dressings serve multiple functions: they protect the incision from microbial contamination and physical trauma, absorb exudate, support and splint the incision, provide pressure to reduce edema and hemostasis, and maintain a moist environment conducive to healing.

Primary Dressings

A primary dressing is placed directly over or in the wound. Its main function is to absorb drainage and wick it away from the wound surface while preventing adherence of the secondary dressing. Primary dressings are typically non-adherent to minimize trauma to granulating tissue during removal.

Examples include:

• Telfa: A non-adherent dressing consisting of a thin layer of cotton fibers encased in a perforated plastic film. It is ideal for clean, dry wounds or those with minimal exudate.
• Adaptic and Xeroform: These are impregnated dressings. Adaptic is a woven mesh impregnated with an emulsion that prevents sticking, while Xeroform contains 3% bismuth tribromophenate, providing mild deodorizing and bacteriostatic properties. These are frequently used for skin grafts, burns, or wounds with moderate exudate.

When applying a primary dressing, the CSFA must ensure it completely covers the incision line but does not extend excessively onto the healthy surrounding skin, which could lead to maceration.

Secondary Dressings

Secondary dressings are placed over the primary dressing. Their primary functions are to provide additional absorption for wound exudate, protect the wound from further trauma, and secure the primary dressing in place.

Common secondary dressings include:

• Gauze Sponges (e.g., 4x4s): Used for moderate to heavy drainage. They can be fluffed to increase their absorptive capacity and provide a cushioning effect.
• ABD (Abdominal) Pads: Large, highly absorbent pads consisting of multiple layers of cellulosic materials. They are used for wounds with heavy exudate, such as major abdominal surgeries or orthopedic procedures.
• Transparent Films (e.g., Tegaderm): While often used as a primary dressing over IV sites, they can act as a secondary dressing to secure other materials and provide a waterproof bacterial barrier while allowing for visual inspection of the wound margins.

Pressure Dressings

Pressure dressings are specialized applications designed to exert consistent, even pressure over a surgical site. This pressure is vital for several reasons: it eliminates dead space to prevent the formation of hematomas or seromas, it controls postoperative bleeding, it minimizes edema, and it immobilizes the area to promote healing.

A pressure dressing typically consists of three layers:

1. Inner (Contact) Layer: A non-adherent primary dressing.
2. Intermediate (Absorbent) Layer: Fluffed gauze or ABD pads placed to bulk up the dressing and distribute pressure evenly.
3. Outer (Securing) Layer: Elastic bandages (e.g., Ace wraps), Elastoplast, or Coban applied with firm, even tension.

Care must be taken to ensure the pressure is sufficient to be effective but not so tight as to compromise distal circulation or cause neurovascular impairment. The CSFA should always assess distal pulses and capillary refill after applying a pressure dressing to an extremity.

Packing Materials

Wound packing is utilized when a wound is left open to heal by secondary intention (granulation) or delayed primary closure (tertiary intention). This is common in contaminated or infected wounds, such as an abscess drainage or a perforated bowel.

Packing materials include:

• Iodoform Gauze: Gauze strips impregnated with an iodine compound, providing antimicrobial properties.
• Plain Gauze Strips: Used for mechanical debridement and absorption.

The packing material must be placed loosely into all crevices of the wound to prevent premature closure of the wound surface, which can trap bacteria and lead to abscess formation. The packing must also be removed and replaced regularly (wet-to-dry dressings) to facilitate mechanical debridement of necrotic tissue.

Binders

Binders are broad, elasticized, or cotton garments used to support and secure dressings over large incisions, primarily in the abdominal or thoracic regions. They provide circumferential support, which reduces stress on the suture line, particularly during patient movement, coughing, or deep breathing.

Abdominal binders are frequently used after major exploratory laparotomies or ventral hernia repairs. Breast binders offer support and compression following mastectomies or breast reconstructions. It is essential that binders are applied snugly but do not restrict respiratory excursion.