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Related Concept Videos

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...
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...
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.
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 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...
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...

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Should the Functional Residual Capacity be Ignored?

Chandra Selvi E1, Kuppu K V Rao, Malathi

  • 1Assistant Professor, Department of Physiology, Sree Balaji Medical College , Chrompet, Chennai, India .

Journal of Clinical and Diagnostic Research : JCDR
|March 2, 2013
PubMed
Summary

Reduced functional residual capacity (FRC) is common in liver cirrhosis patients, potentially causing dyspnea. This study highlights FRC

Keywords:
ComplianceFunctional residual capacityTotal lung capacityVital capacity

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Published on: January 8, 2019

Area of Science:

  • Pulmonary Medicine
  • Gastroenterology

Background:

  • Liver cirrhosis is often associated with lung disease, presenting a restrictive pattern.
  • Lung volumes, particularly functional residual capacity (FRC), have been historically undervalued in cirrhotic patients.

Purpose of the Study:

  • To investigate the significance of functional residual capacity (FRC) and other lung volumes in patients with liver cirrhosis.
  • To analyze the relationship between FRC and other lung parameters in this population.

Main Methods:

  • Forty Child's-B cirrhotic patients were studied.
  • Functional residual capacity (FRC) was measured using the nitrogen wash-out method.
  • Vital capacity was measured using a V02 Max 22 instrument, with other lung volumes as derived parameters.

Main Results:

  • Functional residual capacity (FRC) was found to be reduced compared to reference values in cirrhotic patients.
  • Total lung capacity and vital capacity showed a positive correlation with FRC.
  • An increased residual volume was observed in 12 out of 40 patients.

Conclusions:

  • Reduced functional residual capacity (FRC) in cirrhotic patients may contribute to dyspnea due to restrictive lung mechanics.
  • Lung volume abnormalities and impaired ventilation mechanics are likely present in liver cirrhosis.
  • FRC is influenced by lung and chest wall compliance.