Other systems weak points Flashcards
Function of the dermis
regulate temperature and supply blood to the epidermis
Dermis contains
blood vessels, nerve endings, hair follicles, Pacinian corpuscles, sweat glands, sebaceous glands
Hypodermis consists of
adipose tissue and collagen
Hypodermis functions as
insulator and shock absorber for internal organs
Location and function of Merkel cells
epidermis
light touch
Nerve endings are primarily located where?
dermis
can also be in hypodermis
Pacinian corpuscles are nerve receptors located in and function?
dermis
deep pressure and vibration
Phases of wound healing:
Inflammatory Phase lasts how long?
Proliferative Phase lasts how long?
Maturation Phase lasts how long?
1-10 days
3-21 days
7 days -2 years
Inflammation that persists chronically for weeks and months interferes with
initiation of proliferative phase processes and increases risk of infection
Immature scar vs mature scar
red, raised, and rigid
pale, flat and pliable
Hypertrophic scarring with burn injuries
can significantly impact maturation phase progression.
Burn without hypertrophic scarring will mature within
4-8 weeks
Burns with hypertrophic scarring mature in
2 years
Primary intention healing
acute wounds with minimal tissue loss.
smooth clean edges that are closed with sutures, staples or adhesives.
examples: surgical incision, laceration, puncture, superficial and partial-thickness burns
Secondary Intention healing
permits wound to be closed on their own without superficial closure.
Wounds that heal by secondary intention?
with characteristics such as significant tissue loss or necrosis, irregular or nonviable wound margins that cannot be reapproximated, infection or debris contamination.
Associated with pathology: diabetes, ischemic conditions, pressure damage or inflammatory disease.
Wounds healing by secondary intention require..
ongoing wound care
larger scars
Examples of wounds that heal by secondary intention
neuropathic
arterial
venous
pressure ulcers
most full-thickness wounds
chronically inflamed wounds
Tertiary Intention healing
delayed primary intention
wounds at risk for developing complications such as sepsis or dehiscence may be temporarily left open. Once risk factors are alleviated then wound can be closed by primary intention
Medications that can negatively impact wound healing
anti-inflammatory
immunosuppressive
anti-coagulant
anti-neoplastic
steroid
oral contraceptives
Contamination
presence of non-replicating bacteria on a wound that causes no additional tissue injury and does not stimulate an inflammatory immune response
Colonization
replicating bacteria on a wound that does not invade or further injure tissues and does not stimulate inflammatory response. It can delay wound healing.
They benefit wound healing by preventing more virulent organisms from proliferating in wound bed.
Infection
replicating bacteria that invades viable tissue beyond wound surface causing a visible inflammatory respond. Significantly delays wound healing. Can progress to sepsis, osteomyelitis and gangrene.