Decontamination

Question 1

in manual cleaning, temp of sink water should be ___

why?

Answer 1

45C

- enzymatic detergent inactivated at higher temp, reducing cleaning ability

Question 2

why CHX is not an appropriate cleaning agent? (2)

Answer 2

• makes protein stick to metal

- abrasive, causing scratches which trap contaminants

Question 3

in manual cleaning, how to minimise aerosol risk?

Answer 3

fully submerge instruments in detergent solution

Question 4

why using wire brushes is avoided?

Answer 4

will damage the passivation layer, which helps in corrosion resistance.

Question 5

how often should ultrasonic cleaner be drained and refilled? (2)

Answer 5

• not more than 4 hours
  or
• when solution is visibly coloured or cloudy.

Question 6

Temperature in ultrasonic should be ___

- why?

Answer 6

less than 60C

- will impair ultrasonic action by producing large bubbles.

Question 7

what material is best used for rinsing and drying instruments? (2)

Answer 7

• dry, non-linting disposible cloth

- paper towels

Question 8

4 benefits of washer/disinfection

Answer 8

• has thermal disinfection stage
• has drying stage
• automated/validated
• minimal human contact, reduce sharps injuries

Question 9

5 stages of washer / disinfection

Answer 9

flushing
washing
rinsing
thermal disinfection
drying

Question 10

in flushing stage, what is the temperature of the water?

- why?

Answer 10

<45C

- prevent protein coagulation and fixing of soil to instruments

Question 11

In washing stage, what is the normal temp range?

Answer 11

40-65C

Question 12

In washing stage, what is the normal temp range?

Answer 12

65-90C

Question 13

types of sterilizer? (2)

Answer 13

type N
- downward displacement

Type B
- vacuum

Question 14

what are the cycle parameters for steam sterilization in the UK?

Answer 14

134-137C
3 mins
2.1-2.25 bar