Tissue expander Flashcards
epidermal layer becomes thinner with tissue expansion
F epidermal layer thickens in reaction to tissue expansion, whereas the dermal layer becomes thinner
Growth
factors such as platelet-derived growth factor and angiotensin II have
been implicated in cell growth in tissue expander
T
Mechanical creep relies on the skin’s
ability to acutely stretch and increase in surface area during immediate intraoperative tissue expansion
T
collagen fiber realignment occurs in biological creep
F mechanical creep
increased fibroblast and collagen synthesis, increased
myofilaments, increased mitotic activity, and neovascularization occures in biological creep
t
Mechanical creep is very much dependent on the chronicity of controlled tissue
expansion
F Biological creep
the force
required to maintain tissue elongation decreases with time as the tissue expansion is maintained
T
increased number
and caliber of vessels when compared with a nonexpanded counterpart
T
expanded tissues are a form of a delayed flap
T
In tissue expander Decreased hair follicle density occurs
T
With tissue expander the muscle decrease in it thickness
T
Decrease in size and number of mitochondria
F Increased size and number ofmitochondria
capsular formation quality may be better with texture versus smooth tissue
expanders
T
integrated port is less ideal if there is lack
of coverage secondary to the thinning of overlying soft tissue
T
Smoking, radiation, and infections have a higher risk of
wound complications both during the expansion process and afterward
T
direction of movement will be perpendicular to the incision placed to maximize flap coverage and minimize tension during
expansion
T
If the patient is in any discomfort,
the expansion could be stopped and/or fluid can be taken out until
comfortable again
T
Once the goal is met, the second-staged reconstruction can immediately established
F Once the goal is met, it is best to wait 3 to 4 weeks
before the second-staged reconstruction
One can use this
techniqueto cover large defects involving up to 50% of the scalp without significant thinning of the hair-bearing areas.
T
The expander is typically placed in the
subcutanouse plane under the hair-bearing area.
F The expander is typically placed in the
subgaleal plane under hair-bearing area.
Capsulectomies are avoided, as they may devascularize the flap.
Galeotomies may also devascularize the flap, but if carefully done, one
may preserve the galeal blood supply
T
Permanent cranial molding can occurs with expander
F temporary cranial molding occurs with
correction in 3 to 4 months.
Expansion with direct advancement of
tissues can be used to reconstruct 25% to 70% of forehead defects
T
In neck placement of the
expander above the platysma or submuscular aponeurotic system
T
