Medicine
Respiratory Mechanics in Chronic Obstructive Pulmonary Disease
Quick fact
In COPD, expiratory airflow is so limited that many patients breathe at a higher lung volume (hyperinflation) even at rest, making the diaphragm flattened and less efficient—like trying to blow up a balloon that's already nearly full.
Why this is interesting
Why do people with chronic obstructive pulmonary disease feel breathless not just during exercise but even at rest? The answer lies not in a lack of oxygen but in a mechanical trap: the lungs can't empty fully, and each breath becomes a struggle against a balloon that's already stretched too tight.