Respiratory Consequences of N95-type Mask Usage in Pregnant Healthcare Workers - A Controlled Clinical Study

October 15, 2014 updated by: Pearl Tong, National University Health System, Singapore
The study aims to find out if usage of N95 type respirators affects respiratory parameters in pregnant women so as to provide guidance on N95 respirator usage in pregnant healthcare workers.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The first phase of the study aims to determine the average workload of a nurse. In the second phase of the study, this workload is then translated to walking on a treadmill while pregnant subjects wore special masks open to air, then occluded with N95 mask materials.

Study Type

Interventional

Enrollment (Actual)

20

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Singapore
      • Singapore, Singapore, 119228
        • NUHS

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

21 years to 40 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • Subjects had spontaneously conceived singleton pregnancies and were between 21 to 40 years old. Their hemoglobin levels were ≥11g/dL

Exclusion Criteria:

  • Any cardiorespiratory illness, influenza-like illness in the week prior to the trial, or any pregnancy-related complications such as gestational diabetes, hypertension, intrauterine growth restriction, placenta previa, ruptured membranes, or threatened preterm labor. Any neuromuscular conditions that would preclude them from using the treadmill.

Haemoglobinopathies.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: N95
Intervention: N95 mask material
Device: N95 mask
N95 mask material used to cover aperture of Hans Rudolph mask

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Minute Ventilation
Time Frame: 15 minutes
Participants wore a tight fitting mask (Hans Rudolph) that was attached to the metabolic cart through an air sampling tube. Inspired ambient air and expired air were channeled through a pneumotachometer that was attached to the front of the mask which calculated air volume by the rate of rotation of a rotor turbine located within it. The turbine had zero resistance to air flow and the rate of rotation of the turbine, sensed by infrared light within the pneumotachometer, corresponds directly to inspired and expired air volume for each breath. Multiple air samples from each expired-breath was drawn into the metabolic carts through a sampling line for the measurement of oxygen and carbon dioxide content by the respective gas sensors within the metabolic carts.
15 minutes

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Oxygen and carbon dioxide exchanged
Time Frame: 15 minutes
Participants wore a tight fitting mask (Hans Rudolph) that was attached to the metabolic cart through an air sampling tube. Inspired ambient air and expired air were channeled through a pneumotachometer that was attached to the front of the mask which calculated air volume by the rate of rotation of a rotor turbine located within it. The turbine had zero resistance to air flow and the rate of rotation of the turbine, sensed by infrared light within the pneumotachometer, corresponds directly to inspired and expired air volume for each breath. Multiple air samples from each expired-breath was drawn into the metabolic carts through a sampling line for the measurement of oxygen and carbon dioxide content by the respective gas sensors within the metabolic carts.
15 minutes

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National University Health System, Singapore

Investigators

  • Principal Investigator: Eu-Leong Yong, PhD, NUHS

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2009

Primary Completion (Actual)

September 1, 2011

Study Completion (Actual)

September 1, 2011

Study Registration Dates

First Submitted

September 13, 2014

First Submitted That Met QC Criteria

October 15, 2014

First Posted (Estimate)

October 16, 2014

Study Record Updates

Last Update Posted (Estimate)

October 16, 2014

Last Update Submitted That Met QC Criteria

October 15, 2014

Last Verified

October 1, 2014

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2010/00226

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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