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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...
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.
COPD: Management Using Bronchodilators and Corticosteroids01:26

COPD: Management Using Bronchodilators and Corticosteroids

Chronic obstructive pulmonary isease (COPD) involves a group of progressive lung disorders characterized by persistent airflow limitation and chronic respiratory symptoms. Asthma-COPD Overlap Syndrome (ACOS), encompassing features of both asthma and Chronic obstructive pulmonary disease (COPD), is a group of progressive lung disorders that includes chronic bronchitis, emphysema, and refractory (non-reversible) asthma. ACOS leads to complex clinical presentations that combine the inflammatory...
Chronic Obstructive Pulmonary Disease II: Emphysema01:23

Chronic Obstructive Pulmonary Disease II: Emphysema

Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Obstructive Pulmonary Disease01:24

Chronic Obstructive Pulmonary Disease

COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...

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Related Experiment Video

Updated: Jun 12, 2026

Home-Based Prescribed Pulmonary Exercise in Patients with Stable Chronic Obstructive Pulmonary Disease
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Spirometric function improves in the morbidly obese after 1-year post-surgery.

Shirley Aparecida Fabris de Souza1, Joel Faintuch, Ivan Cecconello

  • 1Department of Physical Therapy, Londrina State University, Londrina, Paraná, Brazil. shirleysouza@uel.br

Obesity Surgery
|May 25, 2010
PubMed
Summary
This summary is machine-generated.

Bariatric weight loss improves pulmonary function in obese women, though expiratory reserve volume (ERV) remains low. This study tracked lung function changes after surgery, highlighting key improvements and persistent limitations.

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Area of Science:

  • Pulmonary Medicine
  • Bariatric Surgery Outcomes
  • Obesity Research

Background:

  • Obesity significantly impacts pulmonary function, often before symptoms manifest.
  • The long-term effects of bariatric surgery on lung function are not fully understood.
  • A prospective study was conducted to investigate these effects in a homogeneous patient group.

Purpose of the Study:

  • To evaluate the impact of bariatric weight loss on pulmonary function tests.
  • To document changes in spirometric parameters over 12 months post-surgery.
  • To correlate pulmonary function improvements with the degree of weight loss.

Main Methods:

  • Prospective cohort study of 61 obese women (BMI 49 ± 5 kg/m²).
  • Spirometry (VC, ERV, FEV1, FEV1/FVC, MVV) performed preoperatively and at 6 and 12 months post-surgery.
  • Statistical analysis to compare preoperative and postoperative results and correlate with weight loss.

Main Results:

  • Significant improvements observed in Forced Vital Capacity (FVC) and Maximum Voluntary Ventilation (MVV) at 12 months.
  • Forced Expiratory Volume in 1 second (FEV1) and FEV1/FVC ratio showed acceptable levels, indicating no obstructive pattern.
  • Expiratory Reserve Volume (ERV) showed delayed recovery, remaining significantly low even after 12 months.

Conclusions:

  • Approximately one-third of obese patients exhibit pulmonary limitations.
  • Bariatric surgery leads to significant improvements in FVC and MVV, with partial recovery of ERV and FEV1/FVC within 6-12 months.
  • ERV remains a critical indicator of persistent pulmonary limitation post-bariatric surgery, despite overall functional improvements.