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Induced-fit Model01:13

Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...

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Modifying NIOSH's Manikin Fit Evaluation Method to Match Fit Testing with Human Subjects.

Ali Hasani1, Joseph Dawson1, Magdalene Fogarasi1

  • 1Division of Applied Mechanics, Office of Science and Engineering Laboratories (OSEL), U.S. Food and Drug Administration (FDA).

Journal of the International Society for Respiratory Protection
|October 16, 2024
PubMed
Summary
This summary is machine-generated.

A modified manikin fit test method better mimics real-world N95 respirator performance after decontamination. This improved method suggests limiting reuse to five dons and favors microwave steam for decontamination.

Keywords:
COVID-19N95 respiratordecontaminationfit factorfit-testmanikin

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Area of Science:

  • Occupational Safety and Health
  • Biomedical Engineering
  • Respiratory Protection

Background:

  • The National Institute for Occupational Safety and Health (NIOSH) developed a manikin fit test as a resource-efficient alternative to human subject fit testing for respirators.
  • During the COVID-19 pandemic, discrepancies emerged between manikin test results and real-world N95 respirator performance after decontamination cycles using human subjects.
  • Existing manikin test methods may not accurately reflect N95 respirator degradation and fit factor changes under realistic usage conditions.

Purpose of the Study:

  • To modify the NIOSH manikin fit-test method to better simulate real-world N95 respirator performance.
  • To evaluate the impact of prolonged wear, repeated donning/doffing, and various decontamination methods on respirator fit factor using the modified manikin test.
  • To provide data-driven insights for optimizing N95 respirator reuse strategies in pandemic scenarios.

Main Methods:

  • The study involved modifying the existing NIOSH manikin fit-test protocol.
  • The modified method was used to assess N95 respirator fit factor after simulated long-term wear, repeated donning/doffing, and decontamination via autoclaving and microwave-generated steam.
  • Breathing simulations included high flow rates (85 and 70 L/min) and both constant and cyclic flow patterns, compared against adult human subject data.

Main Results:

  • The modified manikin fit test showed a minimal overprediction of the overall fit factor (7% and 14%) compared to human subjects at simulated heavy breathing rates.
  • Constant flow breathing simulation yielded comparable results to cyclic flow, simplifying the testing procedure.
  • The study indicated that N95 respirator reuse should be limited to a maximum of five dons within a single work shift.

Conclusions:

  • The modified manikin fit-test method offers a more realistic assessment of N95 respirator performance, particularly after decontamination and repeated use.
  • Microwave-generated steam appears to be a more suitable decontamination method than autoclaving for a single decontamination cycle, preserving respirator fit.
  • Findings support revised guidelines for N95 respirator reuse, emphasizing limitations on donning frequency and recommending specific decontamination techniques for future public health emergencies.