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Prevention of Work-related SARS

Prevention of Work-related SARS. Personal Protective Equipment. Hierarchy of methods of hazard control. Engineering control Administrative control Personal protective equipment. Control of infection. Administrative control Environmental control Personal protective equipment.

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Prevention of Work-related SARS

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  1. Prevention of Work-related SARS Personal Protective Equipment

  2. Hierarchy of methods of hazard control • Engineering control • Administrative control • Personal protective equipment

  3. Control of infection • Administrative control • Environmental control • Personal protective equipment

  4. Control of transmission of infectious disease • Airborne • Droplet • Contact

  5. Personal protective equipment • Surgical mask • Respirator • Goggles • Gown • Gloves

  6. Surgical mask • Three layers • Standards and guidelines set in US by: • American National Standards Institute • The Association of Perioperative Registered Nurses • American Study Society of Testing and Materials • CDC

  7. Surgical mask • Food and Drug Administration • NIOSH

  8. ASTM • Categorize the surgical mask into general use, sub-micron filtering, fluid resistant • Bacterial filtration efficiency • Differential pressure • Sub-micron particulate filtration • Resistance to penetration by synthetic blood • Flammability

  9. Different types of surgical mask • Can be used with face shield or eyewear • Flat –fold tie on • Duck bill • Cone shaped • Flat-fold with shield • High fluid resistant

  10. Things to observe in using a surgical mask • Worn properly • Comfortably cover the mouth and nose • Fit- no tenting around the side of the mouth • Use the pliable strip to promote a close fit • Change frequently when wet • Handle only the string and promptly dispose into a waste receptacle • On or off

  11. Respirators • Purpose • Function • Respiratory protection program

  12. Description and selection of respirators • NIOSH • Facepiece Classification: tight fitting facepiece, loose –fitting facepiece • Tight fitting facepiece is further classified into: quarter masks, half masks and full facepiece • Loose fitting facepieces include hoods, helmets, blouses or full suits which cover the head completely

  13. Description and selection of respirators • Respirator classification : • Air purifying respirators • Atmosphere supplying respirators

  14. Respirator selection

  15. N95 respirator • 42 CFR 84 • Use the most penetrating 0.3 AM aerodynamic mass median diameter. • 9 classes of filters- three levels of filter efficiency and each with three categories of resistance to filter efficiency degradation. • three levels of filter efficiency- 95%, 99% and 99.97% • three categories of resistance to filter efficiency degradation- N, R, P.

  16. N95 respirator • N not resistant to oil • R resistant to oil • P oil proof • The N series are tested by a mildly degrading aerosol of NaCl. The P- and R- series will be tested against a highly degrading aerosol of dicotylphthalate. The specific maximum loading dose was 200mg. The N- and R- series is uaually certified with a single work shift limitation

  17. N95 respirator • Certification of filters was based on statistical evaluation of results from 30 filter tested. Pass/ Fail test based on result from 20 filters tested.

  18. Fit test • Seal check • Qualitative testing • Quantitative testing • Combined direct penetration through the filter and leakage around the face seal • TSI 8020 Portacourt plus TM measures the fit factors • Without surrogate fit testing, average exposure was reduced to 33% of the ambient level, which is much less protection expected of this class of respirator, less than or equal to 10 %.

  19. Fit test • When fit tested first, greater protection than normally expected (the average exposure was reduced to 4% of the ambient level) • Without fit testing, person unknowingly may have poor face seals, resulting in excessive leakage and exposure. • An requirement by OSHA

  20. Effects of respirator use • Respiratory effects • Increased airways resistance • Increased dead space volume • Cough • Cardiovascular effects • Discomfort • Extraweight and Ergonomic concern • Psychological and social effects • Skin problems • Senses

  21. Pregnancy • No good data on respirator use in pregnancy • Most common cause for denying medical clearance • Consider the risk of the work environment to the mother and the developing child, the capacity of the mother to tolerate the PPE, as well as ergonomic consideration

  22. Work condition • Job characteristics • Work environment • Psychological stresses • Equipment –related stresses

  23. Worker evaluation • Work description • Medical history and physical examination • Special testing • Re-evaluation

  24. Certification of use of respirator • Full use • Restricted use

  25. Advice • For infection control of patients with suspected SARS, CDC advises airborne precaution( including use of a N-95 filtering disposable respirator), wearing of eye protection and contact precaution was included in inpatient setting and outpatient setting. A qualitative fit test should be conduct for N95 respirator. If N95 respirator is not available, then surgical mask should be worn. The patient should wear a surgical mask.

  26. Advice • For precaution for Aerosol generating procedures, CDC advises PPE should cover all exposed skin- single isolation gown, a disposable full-body isolation suit, a disposable surgical hood with an attached face shield in combination with a disposable respirator. • Disposable gloves • Eye protection • A face field • Disposable particulate respirators minimum level of respiratory protection

  27. Advice • A fit test • A higher level of respiratory protection should be used if fit test fails • Various types of PAPRs • Full facepiece elastometric negative respirators with N, R or P100 filter

  28. Advice • WHO advises strict adherence with the barrier nursing of patients with SARS using precautions for airborne, droplet and contact transmission. N95 respirator should be worn all the time when attending patients with suspected and confirmed SARS. The patient should wear a surgical mask. All visitors, staff, students and volunteers should also wear N95 in entering the room of a patient with suspected or confirmed disease. Surgical masks are a less effective alternative to N95.

  29. Advice • Hospital Authority advises: Essential infection control advice • All staff must receive infection control precaution. • All persons inside hospital setting must wear a mask. For N95, ensure right size and check the leakage. • All person must practice hand hygiene.

  30. Advice Personal Practice All hospital settings • All persons must wear a mask • All must practice hand hygiene All inpatient settings • Standard precaution • Droplet precautions: surgical mask for all patient contact. Protective eyewear for close patient contact.

  31. Conclusion • Last resort • Level of evidence: expert panel • Empirical measures based on the modes of transmission when the full picture of the disease is not known • Brief introduction of surgical mask and respirator • Brief summary of how personal protective equipment was recommended in various organizations

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