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Related Concept Videos

Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
Respiratory Volumes01:15

Respiratory Volumes

Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...

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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
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Ventilation rates in recently constructed U.S. school classrooms.

S Batterman1, F-C Su1, A Wald1

  • 1University of Michigan, Ann Arbor, MI, USA.

Indoor Air
|April 4, 2017
PubMed
Summary

Many US schools have inadequate ventilation, impacting student health and academic performance. This study reveals most classrooms fail to meet recommended ventilation rates, necessitating improvements for better indoor air quality.

Keywords:
air changecarbon dioxide (CO2)high-performance buildingsventilation

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Area of Science:

  • Environmental Health
  • Building Science
  • Indoor Air Quality

Background:

  • Low ventilation rates (VRs) in schools are linked to increased absenteeism, decreased academic performance, and teacher dissatisfaction.
  • Mechanically ventilated schools, including those with LEED and EnergyStar certifications, may still suffer from insufficient air exchange.
  • Concerns exist that energy-saving and comfort-focused measures might compromise essential ventilation and indoor air quality (IAQ).

Purpose of the Study:

  • To measure ventilation rates in recently constructed or renovated U.S. schools.
  • To compare the accuracy and applicability of different ventilation measurement methods (CO2, steady-state, build-up, decay, transient mass balance).
  • To identify factors influencing ventilation rates and their impact on IAQ.

Main Methods:

  • Ventilation rates were measured in 37 U.S. schools using CO2 and four mass balance techniques.
  • The transient mass balance method was identified as superior for accurately reflecting dynamic occupancy changes.
  • Data were collected during school hours and after closure to assess diurnal variations in ventilation.

Main Results:

  • Average air change rates (ACRs) during the school day were 2.0±1.3 hour⁻¹, with only 22% of classrooms meeting recommended minimums.
  • ACRs significantly decreased to 0.21±0.19 hour⁻¹ when HVAC systems were shut off after school hours.
  • Ventilation rates were not significantly different by building type but were lower in schools using unit ventilators or radiant heating, smaller schools, and larger classrooms.

Conclusions:

  • Most surveyed schools exhibit inadequate ventilation, potentially impairing indoor air quality and negatively affecting occupants.
  • The transient mass balance method is recommended for accurate VR measurement in dynamic environments.
  • There is a critical need to enhance ventilation standards in schools and ensure energy efficiency measures do not compromise IAQ.