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Related Concept Videos

Pulmonary Function Tests01:25

Pulmonary Function Tests

Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
Statistical Methods for Analyzing Epidemiological Data01:25

Statistical Methods for Analyzing Epidemiological Data

Epidemiological data primarily involves information on specific populations' occurrence, distribution, and determinants of health and diseases. This data is crucial for understanding disease patterns and impacts, aiding public health decision-making and disease prevention strategies. The analysis of epidemiological data employs various statistical methods to interpret health-related data effectively. Here are some commonly used methods:
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...
Lung Capacity01:47

Lung Capacity

The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...

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Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
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Influence of secular trends and sample size on reference equations for lung function tests.

P H Quanjer1, J Stocks, T J Cole

  • 1Dept of Pulmonary Diseases and Paediatrics, Erasmus Medical Centre, Rotterdam, The Netherlands. pquanjer@xs4all.nl

The European Respiratory Journal
|September 7, 2010
PubMed
Summary
This summary is machine-generated.

Secular trends did not impact lung function reference equations. Validating these values locally requires at least 150 males and 150 females, making large, collated datasets the recommended approach.

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Area of Science:

  • Pulmonary Medicine
  • Biostatistics
  • Population Health

Background:

  • Lung function reference equations are crucial for diagnosing respiratory conditions.
  • Previous studies have suggested secular trends and sample size may influence these equations.
  • Local validation of existing reference values is often considered but may be impractical.

Purpose of the Study:

  • To determine the impact of secular trends on lung function reference equations.
  • To assess the influence of sample size on the accuracy of these equations.
  • To establish the minimum number of local subjects needed for validating published reference values.

Main Methods:

  • Utilized 30 spirometry datasets (1978-2009) from 19,291 males and 23,741 females (2.5-95 yrs).
  • Applied Generalized Additive Models for Location, Scale and Shape (GAMLSS) to derive best-fit equations for FEV(1), FVC, and FEV(1)/FVC.
  • Subdivided a large dataset into smaller subsets to analyze sample size effects and calculated mean z-scores to assess inter-center differences.

Main Results:

  • No significant secular trends were observed in lung function parameters.
  • Differences between datasets with >1,000 subjects were minimal (max difference: 0.30 to -0.22 z-scores).
  • Validating reference values requires at least 150 males and 150 females to avoid sampling error-induced differences.

Conclusions:

  • Secular trends do not significantly affect lung function reference equations.
  • Local validation of reference equations is rarely practical due to the large sample sizes required.
  • Reference equations derived from large, collated datasets are recommended for broader applicability and accuracy.