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Related Concept Videos

Breathing01:05

Breathing

The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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 Capacities01:24

Respiratory Capacities

Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
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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Related Experiment Video

Updated: Jul 11, 2026

Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
08:25

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Published on: January 8, 2019

Ventilatory function in normal Nigerian school children.

B O Onadeko, A A Iyun, E O Sofowora

    African Journal of Medicine and Medical Sciences
    |March 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    This study determined normal lung function values for Nigerian school children. Results showed lower forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1) compared to predicted values.

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    Area of Science:

    • Pediatric Pulmonology
    • Public Health
    • Anthropometry

    Background:

    • Establishing normative data for lung function is crucial for identifying respiratory abnormalities in children.
    • Previous studies have indicated potential ethnic and environmental variations in lung function parameters.
    • Limited data exists on lung function values specifically for Nigerian school-aged children.

    Purpose of the Study:

    • To determine reference values for lung function tests in Nigerian school children.
    • To compare these values with established international standards.
    • To investigate the correlation of lung function parameters with anthropometric measurements.

    Main Methods:

    • Lung function parameters, including forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1), were measured in 522 school children (257 boys, 265 girls) aged 7-18 years in Ibadan.
    • Measurements were conducted using a wedge bellows vitalograph.
    • Data were analyzed to establish mean values and compare them with predicted values based on age, sex, height, and weight.

    Main Results:

    • The mean FVC and FEV1 values observed in Nigerian children were lower than predicted values matched for age, sex, height, and weight.
    • These values were also found to be lower than those reported for Caucasian children.
    • A significant positive correlation (P < 0.01) was found between FVC and age, weight, and height.

    Conclusions:

    • The study establishes lower-than-expected baseline lung function values for Nigerian school children.
    • These findings highlight the need for region-specific reference standards for lung function assessment in this population.
    • Age, height, and weight are significant predictors of lung function (FVC) in Nigerian children.