Module 1 NDNQI Pressure Injuries
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Pressure Injury - ✔✔localized damage to the skin and underlying soft
tissue usually over a bony prominence or related to a medical or other
device.
The injury can present as intact skin or an open ulcer and may be painful.
The injury occurs as a result of intense and/or prolonged pressure or
pressure in combination with shear. The tolerance of soft tissue for
pressure and shear may also be affected by microclimate, nutrition,
perfusion, co-morbidities and condition of the soft tissue.
1
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, Pressure - ✔✔Pressure is the force (per unit area) exerted perpendicular to
the skin surface. Pressure damages the skin and underlying tissues by
(1) directly deforming and damaging tissue;
(2) compressing small blood vessels hindering blood flow and nutrient
supply and
(3) through ischemia-reperfusion injury. When pressure is redistributed
over a greater surface area, the pressure is less intense in any one area.
Shear stress - ✔✔Shear stress is the force (per unit area) exerted parallel to
the tissue.
Shear strain - ✔✔Shear strain is the actual distortion or deformation of
tissue as a result of shear stress. Some shear strain occurs at rest. Shear
strain is intensified in certain clinical situations (e.g., raising the head of the
bed > 30 degrees; dragging rather than lifting while repositioning). One
layer of tissue slides over another deforming adipose and muscle tissue
and disrupting blood flow.
2
100% Pass Guarantee Katelyn Whitman, All Rights
Exam Questions and Answers 100%
Pass
Pressure Injury - ✔✔localized damage to the skin and underlying soft
tissue usually over a bony prominence or related to a medical or other
device.
The injury can present as intact skin or an open ulcer and may be painful.
The injury occurs as a result of intense and/or prolonged pressure or
pressure in combination with shear. The tolerance of soft tissue for
pressure and shear may also be affected by microclimate, nutrition,
perfusion, co-morbidities and condition of the soft tissue.
1
100% Pass Guarantee Katelyn Whitman, All Rights
, Pressure - ✔✔Pressure is the force (per unit area) exerted perpendicular to
the skin surface. Pressure damages the skin and underlying tissues by
(1) directly deforming and damaging tissue;
(2) compressing small blood vessels hindering blood flow and nutrient
supply and
(3) through ischemia-reperfusion injury. When pressure is redistributed
over a greater surface area, the pressure is less intense in any one area.
Shear stress - ✔✔Shear stress is the force (per unit area) exerted parallel to
the tissue.
Shear strain - ✔✔Shear strain is the actual distortion or deformation of
tissue as a result of shear stress. Some shear strain occurs at rest. Shear
strain is intensified in certain clinical situations (e.g., raising the head of the
bed > 30 degrees; dragging rather than lifting while repositioning). One
layer of tissue slides over another deforming adipose and muscle tissue
and disrupting blood flow.
2
100% Pass Guarantee Katelyn Whitman, All Rights
