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File: Chest X-ray showing left pulmonary agenesis with mediastinal shift and right lung hyperinflation.png
Dynamic hyperinflation is a phenomenon that occurs when a new breath begins before the lung has reached the static equilibrium volume. [1] In simpler terms, this means that a new breath starts before the usual amount of air has been breathed out, leading to a build-up of air in the lungs, and causing breathing in and out to take place when the lung is nearly full.
The increased total lung capacity (hyperinflation) can result in the clinical feature of a barrel chest – a chest with a large front-to-back diameter that occurs in some individuals with emphysematous COPD. Hyperinflation can also be seen on a chest X-ray as a flattening of the diaphragm. [citation needed]
Signs on x-ray that are more commonly seen than the object itself and can be indicative of foreign body aspiration include visualization of the foreign body or hyperinflation of the affected lung. [13] Other x-ray findings that can be seen with foreign body aspiration include obstructive emphysema, atelectasis, and consolidation. [8]
A chest X-ray is usually performed on people with fever and, especially, hemoptysis (blood in the sputum), to rule out pneumonia and get information on the severity of the exacerbation. Hemoptysis may also indicate other, potentially fatal, medical conditions.
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This leads to hyperinflation of the alveoli and, thus, the lungs. When this occurs asymmetrically, one lung can be larger than the other. [23] A severe variant of this condition is called giant bullous emphysema. On chest x-ray, one lung will be significantly more inflated than the other, causing a mediastinal shift.