Week 6 - Infection Control in Healthcare settings Flashcards

1
Q

Define infection control

A

processes and precautions taken to control the spread of infection

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2
Q

What is the chain of infection

A

the cycle of which infection is continuously spread
1. infectious agent
2. Reservoir (water, food, soil, humans, animals)
3. Portal of exit
4. made of transmission (droplet, faecal-oral, vector-borne)
5. portal of entry (mouth, nose, skin cuts, eyes)
6. susceptible host (human)

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3
Q

What are the potential sources of infection from patients and staff

A

Patients with
- acute phase of an infection (not that harmful) e.g. common cold
- prodromal phase of infection e.g. measles, mumps
- Healthy carriers of pathogenic organisms (not symptomatic) e.g. HIV, Hep B and C

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4
Q

What are the modes of trasmission

A
  • Direct
  • Indirect
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5
Q

What is the direct mode of transmission

A
  • unprotected contact with infectious lesions or other skin infections e.g. Herpes, gonorrhea
  • droplet (aerosols which turn into droplets in less than 1 m) e.g. coughing and sneezing
  • Exchange of bloody fluids e.g. HIV, hepatitis
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6
Q

What are the forms of indirect modes of transmission

A
  • Airborne (droplets which can travel as an aerosol for more than 1m) e.g. dental aerosols
  • Contaminated objects (formites) - medical instruments, clothing, surfaces
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7
Q

What are the potential routes of transmission of microorganisms

A
  • Infected from patients or vice verse (direct and indirect)
  • equipment generate aerosols or improper sterilization
  • subsequent patients at risk
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8
Q

How is HIV spread

A

Infected instrument or direct injection of blood

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9
Q

How is Hepatitis B spread

A

Sharps injury

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10
Q

How is Hepatitis C spread

A

Re-using needles, poor infection control practices

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11
Q

Define antiseptic

A
  • Use for people
  • type of chemical disinfectant suitable for use of skin or living tissue, used to kill or remove harmful microorganisms without damaging the tissue
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12
Q

Define disinfectant

A
  • not used on people
  • type of chemical suitable for use on inanimate objects
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13
Q

Define disinfection

A

destruction or removal of most microorganisms (usually kills bacteria, may not kill spores and viruses)

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14
Q

Define sterilization

A

Complete destruction or removal of all microorganisms including spores and viruses

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15
Q

Define biocide

A

chemical capable of killing microbe

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16
Q

What does critical level risk mean

A

the item penetrates sterile tissue, body cavity or blood stream

17
Q

How do you clean critical level risk items

A

sterilisation

18
Q

Examples of critical level risk items

A

surgical instruments
needles
periodontal scalers
implants

19
Q

What is a semi critical level of risk item

A

an item which comes in contact with mucous membranes or non intact skin

20
Q

How do you clean semi critical level risk items

A

single use
sterilization
high level chemical disinfection

21
Q

Examples of semi critical level risk items

A

dental mouth mirrors
amalgam condensers
dental handpieces

22
Q

What are non-critical level of risk items

A

items which only come in contact with intact skin

23
Q

How do you clean non critical level risk items

A

cleaning
decontamination

24
Q

Examples of non critical level risk items

A

x ray heads
bib chain
alginate spatula
protective eyewear

25
26
What are the approaches to prevent infection in healthcare settings
- removal of microorganisms from the environment - removal of organisms from patient care equipment
27
Methods for the removal of microorganisms from the environment
- cleaning - disinfection
28
What are the methods to removal organisms from patient care equipment
- cleaning, disinfection and/or sterilisation
29
ways which instruments and equipment can be cleaned
- automated washer - ultrasonic bath - manual
30
Methods to disinfect things
- heat (boiling for 5 min) - liquids (phenolic compounds, bleach, 70% alcohol
31
Factors which affect liquids ability to disinfect
- If the organism has spores, gram-negative, non-enveloped (more resilient) - high load of bacteria - dilution/volume/contact time
32
Examples of antiseptics
- alcohol (<100%) e.g. skin wipes - chlorhexidine - Iodine-containing
33
Methods/processes for sterilisation
- autoclaves - filtration - hydrogen peroxide - incineration - gamma irradiation
34
Requirements when storing sterile and clean equipment and tools
- use expiry date - re-sterilise equipment if packaging is damaged - store clean items in dry, closed or covered containment
35
How should items which penetrates sterile tissue, body cavity or bloodstream be cleaned
sterilisation JCU - item is washed in the thermal instrument washer, is wrapped, tracked then sterilised e.g. surgical instruments, needles, periodontal scalers, implants
36
How should items which come in contact with mucous membranes or non-intact skin be cleaned
Single use, sterilization, high level chemical disinfection JCU - the item is washed in the thermal instrument washer, is wrapped, tracked, then sterilised e.g. dental mouth mirrors, amalgam condensers, dental handpieces
37
How are items which come in contact with intact skin be cleaned
cleaning, decontamination JCU - the item is washed in the thermal instruments washer, is wrapped, tracked, then sterilised e.g. X-ray heads, bib chain, alginate spatula, protective eyewear
38
What are the standard precautions in healthcare settings
- treat all patients as potentially infectious - standard precautions are applies at all times - hand hygiene before and after - use of PPE - safe use of disposal of sharps routine environmental cleaning - reprocessing of reusable medical equipment and instruments