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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...
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...
Variation: Normal Distribution, Range, and Standard Deviation02:32

Variation: Normal Distribution, Range, and Standard Deviation

In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration

Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area. This equation is...
One-Way ANOVA: Unequal Sample Sizes01:15

One-Way ANOVA: Unequal Sample Sizes

One-way ANOVA can be performed on three or more samples of unequal sizes. However, calculations get complicated when sample sizes are not always the same. So, while performing ANOVA with unequal samples size, the following equation is used:
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...

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Related Experiment Video

Updated: Jun 20, 2026

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
06:11

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults

Published on: February 9, 2022

Differences in pulmonary function based on height prediction obtained by using alternative measures.

José N Sancho-Chust1, Eusebi Chiner, Ana Camarasa

  • 1Pneumology Section, Hospital Universitari Sant Joan d'Alacant, Alicante, Spain.

Respiration; International Review of Thoracic Diseases
|August 29, 2009
PubMed
Summary

Estimating height using alternative measures like knee height can predict pulmonary function in non-ambulatory patients. While these methods show good reproducibility, knee height offers the best agreement for pulmonary function predictions.

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Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
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Published on: January 8, 2019

Area of Science:

  • Pulmonary Medicine
  • Anthropometry
  • Clinical Physiology

Background:

  • Standing height is crucial for predicting pulmonary function.
  • Patients unable to stand pose a challenge for accurate pulmonary function assessment.
  • Alternative anthropometric measures are needed to estimate height in these cases.

Purpose of the Study:

  • To compare predicted pulmonary function using various height estimation methods.
  • To analyze the reproducibility and agreement of these alternative measures.
  • To identify the most reliable method for estimating height in non-ambulatory patients.

Main Methods:

  • Measured standing height, knee height, ulna length, demi-span, and arm span in 100 subjects.
  • Generated predicted forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1) values.
  • Compared predictions based on measured standing height versus estimated heights.

Main Results:

  • Statistically significant differences were observed between estimated and measured standing heights.
  • Excellent reproducibility was found across all alternative measures.
  • Agreement was poor, with most measures overestimating predicted pulmonary function; knee height showed the least overestimation.

Conclusions:

  • Estimating height with alternative measures introduces errors in pulmonary function predictions.
  • Quantifying this error is essential for clinical application.
  • Knee height demonstrates the best agreement and is recommended for patients unable to stand.