N95 Reuse During COVID-19

Completed

• Conditions: Frontline Providers; Emergency Medicine; Healthcare Worker

• Registration Number: NCT05148793
• Lead Sponsor: University of California, San Francisco

Brief Summary

During critical personal protective equipment (PPE) shortages, such as those associated with the COVID-19 pandemic, Centers for Disease Control (CDC) recommends N95 extended use (wearing the same N95 for multiple patient encounters) and limited reuse (storing an N95 between shifts for use over multiple shifts with or without decontamination) as contingency and crisis capacity strategies, respectively. Many healthcare workers (HCWs) are employing these strategies out of necessity. The sustained performance of these respirators depends on the respirator maintaining its filtration efficiency and its ability to provide an adequate seal (fit) to the user's face. Fit testing is performed when a respirator is issued to the user and on an annual basis thereafter. A user-seal check is then performed whenever a respirator is donned. Previous studies have found repeated donnings/doffings to significantly decrease the respirator's fit. A recent pilot cross-sectional clinical study conducted by the University of California, San Francisco found fit failures of respirators after being worn for 2 shifts. However, more definitive data regarding respirator performance during reuse and extended use are lacking. The investigators plan to address these critical gaps in knowledge by conducting a prospective cohort study to determine the incidence of N95 fit failure when subjected to extended use/reuse in a clinical setting. The investigators plan to enroll 396 ED providers (including physicians, nurses, and staff) when obtaining a new NIOSH approved N95s and performing serial fit tests at the end of each 8-12 hour shift for up to 5 clinical shifts or until N95 failure, whichever is earlier. By carefully measuring fit test failure in a clinical setting, the investigators will be able to provide guidance regarding the safety of N95 extended use and reuse necessitated by the need for PPE conservation. Specifically, the investigators will address the following research questions: 1) how long N95s maintain their fit during extended use, 2) how many times N95s can be donned/doffed and maintain their fit, 3) the ability of a user seal check to indicate fit in the field, 4) what adverse health effects, reports of discomfort, or symptoms are experienced by users during extended use and reuse, 5) what effect does extended use and reuse have on N95 filtration performance, 6) the level of contamination of N95s when subjected to extended use and reuse, 7) the effect of modifications to N95 (covering an N95 with a face shield or surgical N95s, facial coverings) on fit failure.

Detailed Description

Frontline healthcare workers are at high risk of SARS (severe acute respiratory syndrome) CoV-2 (COVID-19) infection. Personal protective equipment (PPE), such as an N95 respirator (N95), is essential for prevention of COVID-19 among HCWs. N95s can prevent aerosolized transmission of viral particles and reduce COVID-19 among HCWs, helping to reduce infection rates and preserve the workforce. Under normal circumstances, the CDC recommends that HCWs dispose of N95s after a single patient encounter. However, during critical PPE shortages such as those during the current COVID-19 pandemic, the CDC recommends N95 extended use (wearing the same N95 for multiple patient encounters) and re-use (storing an N95 between shifts for use over multiple shifts). N95 shortages have been widely reported during the COVID-19 pandemic and have forced HCWs to practice extended use and reuse of N95s. Despite the CDC's guidelines, there are limited data regarding the efficacy of N95s under conditions of extended use and reuse and existing studies have been conducted in laboratory settings rather than in the actual health care environment. (Bergman 2012; Vuma et al 2019). This has left health care workers, including emergency department (ED) providers on the front lines of the COVID-19 pandemic, without clear guidance regarding N95 conservation. Many have implemented various reuse and extended use policies out of necessity but with no empirical evidence of their safety and effectiveness.

The study team conducted a pilot cross-sectional study of 68 ED providers who wore either a 3M 1860 dome style N95 or a duckbill N951. 70.6% of duckbill N95 failed a standardized fit test with 3M bitter solution and a hood. Of the dome style , 27.5% failed a fit test. N95 failure was associated with increasing numbers of shifts used: There were 0/11 failures after 1 shift, 1/12 failures after 2 shifts, 3/13 failures after 3 shifts, and 10/15 failures after 4 or more shifts. Also, more donnings and doffings were associated with fit failure, with a median of 8 donning and doffings in the fit pass group and 15 donning and doffings in the fit failure group. This preliminary study had a number of limitations, including a small sample size, convenience sampling, and cross-sectional design, and so was unable to definitively identify the number of shifts or donnings/doffings for which N95s can be safely reused.

The investigators propose to conduct a prospective cohort study of 396 participants across 6 ED sites to estimate the cumulative incidence of N95s when subjected to extended use and reuse in a clinical (emergency department) setting with fit test failure and contamination as the main endpoints. The investigators also seek to compare the fit test failure between varying types of HCWs wearing a number of N95 types. Additionally, the investigators will collect the N95s used in this study for additional analyses of at an outside laboratory measuring COVID-19 contamination levels and filtration efficiency.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2021-04-01
• Study First Submitted: 2021-12-06
• Study First Submitted QC: 2021-12-06
• Study First Posted: 2021-12-08
• Primary Completion: 2022-12-31
• Study Completion: 2022-12-31
• Status Verified: 2023-02
• Last Update Submitted: 2023-02-15
• Last Update Posted: 2023-02-16

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 412

Inclusion Criteria

Not provided

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Exclusion Criteria

Not provided

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Number of participants with qualitative fit test failure (N95 A, end of shift 1)	At the end of shift A1, up to 12 hours	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 1, for N95 A. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 A, end of shift 2)	At the end of shift A2, up to 12 hours per shift, 24 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 2, for N95 A. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 A, end of shift 3)	At the end of shift A3, up to 12 hours per shift, 36 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 3, for N95 A. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 A, end of shift 4)	At the end of shift A4, up to 12 hours per shift, 48 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 4, for N95 A. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 A, end of shift 5)	At the end of shift A5, up to 12 hours per shift, 60 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 5, for N95 A. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 B, end of shift 1)	At the end of shift B1, up to 12 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 1, for N95 B. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 B, end of shift 2)	At the end of shift B2, up to 12 hours per shift, 24 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 2, for N95 B. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 B, end of shift 3)	At the end of shift B3, up to 12 hours per shift, 36 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 3, for N95 B. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 B, end of shift 4)	At the end of shift B4, up to 12 hours per shift, 48 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 4, for N95 B. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).
Number of participants with qualitative fit test failure (N95 B, end of shift 5)	At the end of shift B5, up to 12 hours per shift, 60 hours maximum	Qualitative fit test outcome is measured by a trained fit tester at the end of participant shift 5, for N95 B. The fit test is performed up to 5 times per N95 or until fit test failure. The fit tester records whether the N95 passed fit testing (Yes or No). The fit test variable outcome indicates a passed fit test (yes) or failed fit test (no).

Secondary Outcome Measures

Name	Time	Method
Number of participants with User Seal Check failure (N95 A, end of shift 1)	At the end of shift A1, up to 12 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given facial filtering respirator (FFR) develops an acceptable "leak-free" seal with a subject's face. A user seal check (USC) is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research Clinical Research Coordinator (CRC) will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 A, end of shift 2)	At the end of shift A2, up to 12 hours per shift, 24 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 A, end of shift 3)	At the end of shift A3, up to 12 hours per shift, 36 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 A, end of shift 4)	At the end of shift A4, up to 12 hours per shift, 48 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 A, end of shift 5)	At the end of shift A5, up to 12 hours per shift, 60 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 B, end of shift 1)	At the end of shift B1, up to 12 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 B, end of shift 2)	At the end of shift B2, up to 12 hours per shift, 24 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 B, end of shift 3)	At the end of shift B3, up to 12 hours per shift, 36 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 B, end of shift 4)	At the end of shift B4, up to 12 hours per shift, 48 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.
Number of participants with User Seal Check failure (N95 B, end of shift 5)	At the end of shift B5, up to 12 hours per shift, 60 hours maximum	Participants will be asked to perform a brief "self- test" occurring prior to an actual fit test to determine that a given FFR develops an acceptable "leak-free" seal with a subject's face. A USC is subjective and determines whether the participant feels that the respirator seals well enough with the participant's face to proceed forward with the actual fit test. The research CRC will record whether the user seal check indicates a good seal.

Trial Locations

Locations (1)

University of California, San Francisco; 🇺🇸 San Francisco, California, United States