POD 2 Flashcards
3 layers of skin
- epidermis
-dermis - subcutaneous
epidermis
outermost layer of skin on your body. It protects your body from harm, keeps your body hydrated, produces new skin cells and contains melanin
dermis
middle layer of skin in your body. It has many different purposes, including protecting your body from harm, supporting your epidermis, feeling different sensations and producing sweat and hair.
hypodermis
storing energy, connecting the dermis layer of your skin to your muscles and bones, insulating your body and protecting your body from harm
wound is
- disruption of integrity and function of tissue in body
- causes cells that would normally be connected to become separated (not all equal & therefore treatment varies)
wound healing is
complex and ordered sequence of biochemical events that occur in response to tissue injury and leads to tissue repair
tissue layers involved & their capacity for regeneration determine the mechanism of repair of any wound
2 types of wound healing
- primary intention
- secondary intention
primary intention is
tissue edges are brought together (approximated) or closed with sutures, staples, or steri-strips & minimal or no tissue loss
does primary intention have minimal granulation tissue or scarring
YES
primary intention has minimal risk of
infection or deficits
with primary intention does healing occur quickly or slowly
QUICK
examples of primary intention
lacerations, punctures, thermal burns, blisters, surgical incisions
secondary intention is
wound edges are unable to be approximated & involves loss of tissue
with secondary intention, how does the wound heal
it is left open until it fills with scar tissue & occurs from bottom up & from outer edges toward the centre
secondary intention there is an increase in
infection & more likely to scar
secondary intention examples
pressure ulcers
wound healing is divided into 3 phases
inflammatory phase, proliferative phase, maturation phase
inflammatory phase
- commences as soon as tissue integrity is disrupted by injury; this begins the coagulation cascade to limit bleeding
duration of inflammatory phase
0-14 days
wounds closed by primary intention = lasts 4 days
inflammatory phase is characterized by
erythema, edema, pain
proliferative phase
begins as the cells that migrate to site of injury (fibroblasts, epithelial cells, vascular endothelial cells)
fibroblas proliferation stimulated by macrophage-released growth factors
during the proliferative phase, what kind of tissue is started
granulation
duration of proliferative phase
4-42 days
maturation phase
collagen degradation, and collagen remodeling
duration of maturation phase
24 days -18months
scar tissue formation occurs during which stage
maturation
what is the #1 enemy of surgical wound
INFECTION