Ch 19 - Bandages and Drains Flashcards
What is Laplace’s lay in regards to bandages?
The pressure applied under each point under a bandage is proportional to (NxT)/(RxW)
N=number of bandage layers, T=bandage tension, R=radius of curvature of body part, W=width of bandage material under tension
What is the normal closing pressure of arterioles to the skin and to the underlying muscle?
- Skin 30mmHg
- Muscle 50mmHg
List the three main methods of pressure relief in bandages
- Doughnuts
- Windows
- Splints
List five techniques for anchouring bandages?
- Stirrups
- Tape strip overlays
- Torso straps
- Figures-of-8
- Incorporating hair
List three benefits of drains
- Remove accumulations of serum and blood that provide a media for bacteria
- Pressure relief (pressure can compromise perfusion and cause pain)
- Evacuation of inflammatory mediators, bacteria, necrotic tissue and foreign material
What are the two main types of reservoirs on active drains?
- Compressible
- Rigid
What is the recommended negative pressure generated in human drains?
- 25-74mmHg for delicate tissue
- 75-250mmHg for heavier exudate or large areas
- 200-400mmHg to encourage active adhesion
What pressures can be generated by a grenade bulb using various methods of compression?
- 170mmHg when rolled from apex to base
- 110 when compressed with 2 hands
- 84 when compressed with 1 hand
What is the decision to remove a drain based on?
The quantity and quality of the fluid and ongoing drain function
One study found significant lower incidence of seroma formation in SQ wounds when the drain was removed when the productions was below 0.2ml/kg/hr
What pressures can be generated by a grenade bulb using various methods of compression?
- 170mmHg when rolled from apex to base
- 110 when compressed with 2 hands
- 84 when compressed with 1 hand
