Pressure and Tissue Viability Concepts

The video tutorial discusses pressure sores, also known as decubitus ulcers, which result from prolonged pressure on the skin. It explains the importance of preventing these sores through regular patient movement and pressure relief. The concept of pressure is defined as force over area, with clinical examples demonstrating how pressure can lead to tissue damage. The video also covers the definition of pressure sores, the role of shearing forces, and the importance of maintaining blood supply to prevent tissue degeneration.

What is a primary cause of pressure sores in immobile patients?

• High blood pressure

• Excessive exercise

• Prolonged pressure on the same area

• Lack of nutrition

How often should a completely immobile patient's position be changed to prevent pressure sores?

• Every 3 hours

• Every hour

• Every 30 minutes

• Every 6 hours

What two factors determine pressure?

• Area and volume

• Force and area

• Volume and speed

• Force and speed

What is the clinical significance of 25 mm of mercury in relation to pressure?

• It is the pressure needed to inflate a balloon

• It is the pressure required to close skin capillaries

• It is the pressure required to boil water

• It is the pressure needed to lift a book

In the knife and margarine demonstration, what does the narrow point of the knife illustrate?

• Increased pressure

• Decreased force

• Decreased pressure

• Increased force

What is a pressure sore?

• A type of skin rash

• A degenerative change in tissue due to compression

• A viral infection

• A bacterial infection

What are shearing forces?

• Forces that expand the patient

• Forces that compress the patient

• Forces that cause the patient to slide down

• Forces that lift the patient

How do shearing forces contribute to pressure sore formation?

• By reducing blood supply

• By enhancing tissue growth

• By increasing blood flow

• By cooling the skin

What is the initial sign of pressure sore development?

• Open wounds

• Red areas over pressure points

• Swelling

• Blisters

Why is it important to relieve pressure on tissues?

• To enhance tissue color

• To reduce tissue elasticity

• To maintain tissue viability

• To increase tissue temperature