Related Experiment Video
Updated: Jun 13, 2026
08:35
Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction
Published on: August 17, 2022
Dynamic hyperinflation after metronome-paced hyperventilation in COPD--a 2 year follow-up
Jorien Hannink1, Anke Lahaije, Erik Bischoff
1Department of Pulmonary Diseases, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. J.Hannink@LONG.umcn.nl
Respiratory Medicine
|May 11, 2010
Summary
Dynamic hyperinflation (DH) significantly increased in COPD patients over two years, even without changes in FEV1. This suggests DH may sensitively track airflow obstruction progression.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- The long-term behavior of dynamic hyperinflation (DH) in COPD patients remains largely unknown, contrasting with the known decline in FEV1.
- Metronome-paced hyperventilation (MPH) offers a practical method to assess DH, serving as a surrogate for exercise testing.
Purpose of the Study:
- To investigate changes in MPH-induced DH over a two-year period in patients with mild-to-severe COPD.
- To assess the impact of smoking status on DH progression and its relationship with other lung function parameters.
Main Methods:
- Patients from a general practice randomized controlled trial underwent lung function and DH measurements at baseline, 12, and 24 months.
- DH was evaluated using MPH, setting breathing frequency at double the baseline rate.
- Changes in inspiratory capacity post-MPH were used to infer DH changes, assuming constant total lung capacity.
Main Results:
- A significant increase in DH (0.23±0.06L, p≤0.001) was observed over two years in 68 completing patients.
- No significant changes in FEV1 %predicted were noted during the follow-up period.
- Smokers exhibited lower FEV1, a faster decline, and a greater increase in DH compared to non-smokers. DH correlated positively with resting inspiratory capacity.
Conclusions:
- COPD patients demonstrated a significant two-year increase in MPH-induced DH, independent of FEV1 decline.
- DH may serve as a sensitive indicator for monitoring the effects of evolving airflow obstruction in COPD.
Related Concept Videos
01:25Hyperpnea and Hyperventilation
Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
01:30Alterations in Respiration II
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
01:23Chronic 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.
01:19Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations
Chronic Obstructive Pulmonary Disease, or COPD, is a long-term condition marked by persistent and only partially reversible airflow limitation. It involves two overlapping conditions—chronic bronchitis and emphysema—which often co-appear but differ in dominant symptoms and underlying mechanisms.Chronic Bronchitis FeaturesChronic bronchitis presents with a persistent productive cough and thick, sometimes purulent mucus due to airway inflammation, enlarged mucus glands, and goblet cell...
01:27Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies
Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History
Medical History
01:10Atelectasis II: Pathophysiology
Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...