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Difficulty: HardOrthopedic Surgery

A 28-year-old carpenter is brought to the emergency department after accidentally severing his left index finger with an electric table saw 30 minutes ago. His blood pressure is 135/85 mmHg, heart rate is 98/min, and respiratory rate is 16/min. On physical examination, the patient is alert and cooperative. The proximal stump of the left index finger is cleanly amputated at the level of the proximal phalanx. Bleeding is effectively controlled with a sterile compressive dressing. The amputated digit has been brought to the hospital by his coworkers, currently resting on a dry, dirty cloth. Arrange the following steps in the most appropriate chronological order for the optimal preservation and transport of the amputated digit to a microsurgical replantation center.

  1. 1Gently irrigate the amputated digit with sterile normal saline to remove gross contamination.
  2. 2Wrap the amputated digit in sterile gauze moistened with normal saline.
  3. 3Place the wrapped digit inside a clean, watertight plastic bag and seal it completely.
  4. 4Submerge the sealed plastic bag containing the digit into a container filled with an ice-water slush mixture.
  5. 5Transport the patient and the appropriately cooled digit to a specialized microsurgical replantation facility.

Answer

The correct chronological sequence is to first irrigate the digit with saline, then wrap it in saline-moistened gauze, seal it inside a watertight plastic bag, submerge the sealed bag in an ice-water slush, and finally transport the patient to a replantation center.
The viability of an amputated digit depends heavily on rapid and correct preservation. Warm ischemia time is poorly tolerated by musculoskeletal structures. By initiating cold ischemia, the metabolic rate drops, extending the viability window up to 12-24 hours for digits. The crucial principle is avoiding direct tissue damage. The digit must first be cleaned of gross debris using gentle saline irrigation. It is then wrapped in saline-moistened gauze to prevent desiccation. Next, it must be sealed in a watertight bag to prevent direct contact with water, which causes severe maceration and swelling, complicating microscopic vascular repair. Finally, the sealed bag is placed in an ice-water slush (never pure ice or dry ice), maintaining the temperature around 4°C without causing irreversible frostbite. Once appropriately preserved, immediate transport to a microsurgical facility is indicated.

Step-by-Step Solution

1
Irrigate the amputated part.
Gross contamination is removed with sterile saline.
Harsh chemicals or excessive scrubbing can destroy delicate neurovascular structures required for replantation.
2
Wrap the digit.
The digit is protected in saline-moistened sterile gauze.
Moist gauze maintains an optimal local environment, preventing the soft tissues from desiccating.
3
Seal in a bag.
The wrapped digit is placed in a watertight plastic bag.
This establishes a physical barrier to prevent direct exposure to ice and water, which causes tissue maceration.
4
Induce hypothermia.
The sealed bag is submerged in an ice-water slush.
Cold ischemia at approximately 4°C decreases cellular metabolic demand, significantly extending the viability window for the amputated part.
5
Transport.
The patient and the preserved digit are transferred.
Microsurgical replantation requires specialized surgical teams typically located at designated tertiary trauma centers.

Key Concept

The optimal preservation of an amputated digit involves wrapping it in saline-moistened gauze, sealing it in a watertight bag, and cooling it in an ice-water slush to maximize cold ischemia time while preventing maceration and frostbite.
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Topics

Orthopedic Surgery

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