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Related Concept Videos

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...
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 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...
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...
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:

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Related Experiment Video

Updated: May 18, 2026

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

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

Published on: January 8, 2019

New reference equations to improve interpretation of infant lung function.

The Thanh Diem Nguyen1, Ah-Fong Hoo, Sooky Lum

  • 1Portex Respiratory Unit, UCL Institute of Child Health and Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK. t.nguyen@ucl.ac.uk

Pediatric Pulmonology
|September 6, 2012
PubMed
Summary

Infant pulmonary function tests (IPFTs) should not be reported as size-corrected ratios due to growth-related bias. Instead, use established reference equations for accurate interpretation of lung function in infants.

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Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
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Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus

Published on: March 6, 2019

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology
  • Biostatistics

Background:

  • Infant pulmonary function tests (IPFTs) are increasingly used in clinical and research settings.
  • Accurate interpretation of IPFT results is crucial for diagnosis and management.
  • Standardization of IPFT interpretation is needed to avoid bias.

Purpose of the Study:

  • To assess bias from normalizing infant pulmonary function (IPF) by body size ratios.
  • To develop reference ranges for tidal breathing, respiratory mechanics (compliance [Crs], resistance [Rrs]), and plethysmographic functional residual capacity (FRCp).
  • To establish reference ranges for white infants up to 2 years of age.

Main Methods:

  • IPFTs were performed using the Jaeger BabyBody system under standardized protocols.
  • Multilevel modeling was employed to create reference equations.
  • Equations were adjusted for body size, age, and sex where applicable.

Main Results:

  • Lung function-to-body length ratios showed significant changes with growth, making them unsuitable for outcome measures.
  • Tidal volume and Crs ratios to body weight were relatively constant, but FRCp ratios were not.
  • A strong inverse relationship between lung function/body weight and weight z-score was observed, potentially distorting results in growth-restricted infants.
  • Crown-heel length was the most significant predictor of IPF.

Conclusions:

  • Discourage the use of size-corrected ratios for reporting IPF; rely on appropriate reference equations.
  • The derived reference equations are applicable to white infants and young children up to 2 years old, tested with the specified equipment.
  • Further research is needed to confirm applicability to diverse ethnic backgrounds and different testing equipment.