NCT02265926 - Respiratory Consequences of N95-type Mask Usage in Pregnant Healthcare Workers - A Controlled Clinical Study | Crick

Overview

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.

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

Allocation

NA

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

20

Conditions

Hypoventilation

Interventions

N95 maskDEVICE

N95 mask material used to cover aperture of Hans Rudolph mask

Eligibility

Sex: FEMALEMin age: 21 YearsMax age: 40 Years

Medical Language ↔ Plain English

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.

Locations (1)

NUHS

Singapore, Singapore

Outcomes

Primary Outcomes

Minute Ventilation

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.

Time frame: 15 minutes

Secondary Outcomes

Oxygen and carbon dioxide exchanged

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.

Time frame: 15 minutes