Q) In preop evaluation before placing skin graft over wounded area…bacterial colony count must be less than
a) 10000
b) 100000
c) 1000000
d) 10000000
ans b) 10 raise to the power 5
In advanced surgical practice, the bacterial colony count is a critical factor when considering the placement of a skin graft over a wounded area. The threshold for bacterial contamination in the wound is typically 100,000 colony-forming units (CFU) per gram of tissue. If the bacterial count exceeds this limit, the risk of postoperative infection, graft failure, and delayed healing increases significantly.
This threshold is based on several key factors:
- Wound infection: A bacterial count above 100,000 CFU per gram is associated with a high risk of wound infection, which can lead to graft failure.
- Graft survival: A sterile or minimally contaminated wound is crucial for graft take. Any significant bacterial load can compromise the graft's survival due to the impaired healing environment.
Prerequisites for skin grafting:
The recipient site should be assessed for potential bacterial load, blood supply,
presence of devitalized tissue, and exposed vital structures.
Donor site availability
Perform recipient site tissue culture if history or concern for infection (counts <100000
CFU/g tissue for most pathogens required before grafting).
Presence of group a beta heamolytic streptococci is absolute contraindication for skin grafting
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