Ch. 26 Skin Grafting Flashcards
What is a pedicle graft?
A pedicle graft remains connected to the donor site, at least temporarily, by a vascular pedicle that sustains the graft, ensuring its viability.
A pedicle graft is useful for covering a poorly vascularized wound, because the graft is not dependent on the vascularity of the recipient site
What is an autograft
The autograft (or isograft) is a graft transferred from one site to another on the same individual.
The recipient of an autograft mounts no detrimental immune response against the graft because the recipient and donor are the same.
What is an allograft?
A graft transferred between different members of the same species is an allograft (or homograft)
The recipient of an allograft or xenograft mounts an immune response against the graft, causing the graft to be eventually rejected.
A second allograft from the same donor applied to the wound survives only a few days, but an allograft from a different donor survives for about the same time as the first allograft, usually at least several weeks
What is a xenograft?
a graft transferred from one species to another is a xenograft (or heterograft).
What is a full-thickness graft composed of?
epidermis and the entire dermis;
split-thickness (or partial-thickness) grafts are composed of epidermis and only a portion of the dermis.
Grafts with a thick dermis have
a. better durability but lower survivability
b. better survivability but lower durability
c. better cosmesis and better survivability
d. thickness of the dermis does not effect the outcome
a. better durability but lower survivability
The thickness of dermis within the graft is directly proportional to the graft’s durability and cosmesis but inversely proportional to the graft’s ability to survive.
The skin graft is firmly united to the recipient bed by around what day?
a. 3-4
b. 21
c. 10
d. 60
c. the graft is firmly united to the recipient bed by around the 10th day.
The graft revascularizes how long after grafting
a. day 4-5
b. day 10
c. day 30
d. day 60
a. day 4-5
Hair begins to appear in split-thickness grafts how long after grafting?
a. 4 - 6 weeks
b. 10 - 14 days
c. Hair does not grow back in split thickness grafts
d. 8-12 weeks
a. 4-6 weeks
Hair begins to appear in split-thickness grafts at between 4 and 6 weeks and often grows to a greater than normal length, at least on grafts applied to limbs
True or false: Regarding skin grafts:
Reinnervation returns more rapidly, but to a lesser extent, in split-thickness grafts than in full-thickness grafts
True
Primary contraction of skin grafts; greatest to least contraction
a. Full thickness, split-thickness, epidermal
b. Epidermal, split-thickness, full thickness
c. Split thickness, full thickness, epidermal
d. Split thickness, epidermal, full thickness
Primary contraction is greatest in full-thickness grafts and decreases as grafts become thinner.
Full-thickness grafts from humans contract to nearly half their original size after being harvested.
Split-thickness grafts that are about half the thickness of the whole skin contract to about three quarters of their original size, and grafts composed solely of epidermis do not shrink at all.
Skin grafts in horses fail most frequently due to
Infection
How does fluid accumulation affect graft healing
A hematoma, a seroma, or exudate beneath the graft prevents fibrin from attaching the graft to the wound and acts as a barrier to the ingrowth of new vessels.
What is the single biggest factor in skin graft survival
a. % of dermis
b. age of recipient
c. concentration of bacterin in the recipient bed
d. hematoma formation in the recipient bed
c. Survival of a skin graft is better correlated to the concentration of bacteria in the recipient bed than to any other single factor
