Elastic recoil

Mar 19, Answer:

Elastic recoil

Gold MD, Laura L.

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Lung elastic recoil is an important physiologic characteristic of the Elastic recoil, which may change in qualitatively different ways in various diseases. In general, elastic recoil is increased in a restrictive ventilatory defect associated with decreased lung volumes.

Elastic recoil

Conversely, in almost all forms of airflow obstruction, elastic recoil is decreased. Testing for elastic recoil is time-consuming, difficult to perform, expensive, and invasive.

elastic recoil The inherent resistance of a tissue to changes in shape, and the tendency of tissue to revert to its original shape once deformed. A sensitive indicator of elastic recoil (ER) is the coefficient of retraction—the ratio of the maximal static recoil pressure to total lung capacity. Elastic recoil means the rebound of the lungs after having been stretched by inhalation, or rather, the ease with which the lung rebounds. With inhalation, the intrapleural pressure (the pressure within the pleural cavity) of the lungs decreases. Relaxing the diaphragm during expiration allows the lungs to recoil and regain the intrapleural. The alveoli of the lungs act much like balloons in that there is some effort involved to inflate them, but when the inflating pressure is released, the recoil of the elastic walls provides the pressure necessary to deflate them. The lungs are suspended in the thoracic cavity .

Thus the test may not be practical for the routine evaluation of patients with restrictive ventilatory defects but may be of great value in the assessment of various obstructive ventilatory defects, including those with isolated bullae or advanced emphysema, to determine whether patients will benefit from resection of nonfunctioning or very poorly functioning lung tissue.

In other patients, it may be useful to differentiate emphysema from asthma or bronchitis. In evaluating patients with mixed ventilatory defects e. Lung elastic recoil pressure, or transpulmonary pressure Plis the difference between the pressure inside the lungs the alveolar pressure and the pressure outside the lungs the pleural pressure [Ppl: Under conditions of no flow and pressures at the mouth, alveoli, and atmosphere are equal: This example illustrates two of the principles that underlie measurement of lung recoil: It is easy to measure Pmouth; absolute lung volume can be measured by any of a variety of methods already discussed; and the change in volume can be measured easily with a spirometer.

All that is needed to measure lung elastic recoil pressure and lung compliance is a measurement of Ppl in relation to lung volume.

Elastic recoil

Because the esophagus passes through the pleural space, it seems reasonable to assume that pressure within the esophagus approximates Ppl.

This assumption works as long as the sphincters of the upper and lower esophagus are competent and there is no force compressing the esophageal lumen, such as active contraction of the esophageal muscles or passive compression by surrounding mediastinal structures.

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Most of these conditions are met in subjects without esophageal disease who are sitting or standing upright.Elastic recoil rapidly releases stored energy The snipefish feeding strike took from two to milliseconds from start to prey capture, with an instantaneous power requirement averaging A sensitive indicator of elastic recoil (ER) is the coefficient of retraction—the ratio of the maximal static recoil pressure to total lung capacity.

ER is the effective pressure driving maximal expiratory airflow, and is increased after lung-reduction surgery for severe emphysema. Aug 06,  · Elastic recoil is the tendency of the lungs to recover as people breathe in and out, preventing the lungs from collapsing on exhalation and allowing them to fill on inhalation.

This characteristic can be seen with other air-filled objects like balloons and the bladders used by undersea organisms to control submersion. The first half of the book, written by the primary authors, describes the interactions between incident ions and target atoms and introduces five ion beam analysis techniques: backscattering spectrometry, elastic recoil detection, nuclear reaction analysis, particle-induced x-ray emission, and ion channeling.

Elastic Recoil in any tissue (including arteries) refers to the inherent resistance of a tissue to changes in shape, and the tendency of the tissue to revert to its original shape once deformed. Nov 27,  · How To Punch Harder Using Simple Science - Freakish Power Punch Training - Increase Striking Power - Duration: FightSmartTrav 1,, views.

Elastic recoil - Wikipedia