work of breathing


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work of breath·ing

(wŏrk brēdh'ing)
The total expenditure of energy necessary to accomplish the act of breathing; may be computed in terms of the pulmonary pressure multiplied by the change in pulmonary volume, or in terms of the oxygen cost of breathing (i.e., the O2 consumption above basal metabolic O2 use attributable to breathing).

work of breathing

Abbreviation: WOB
The amount of effort used to expand the lungs. It is determined by lung and thoracic compliance, airway resistance, and the use of accessory muscles for inspiration or forced expiration. It is measured in joules/L, joules/min and sometimes kg/m/min. The measurement of the WOB is analogous to the typical description of work in physics (work = force x distance). In respiratory physiology, work = pressure x volume.
See also: work
References in periodicals archive ?
Our goal is just to shorten the duration of controlled mandatory ventilation, paralysis and prone position by dissecting the different factors involved in the pathophysiology of early severe diffuse ARDS, including fever control, cardiac output and microcirculation, upright position, normalized chemoresponse to acidosis and C[O.sub.2], normalized work of breathing with low PS-high PEEP, lowered inflammation and early spontaneous ventilation with alpha-2 agonists.
Also early during the onset of ARDS, pulmonary compliance decreases severely, contributing to an increased work of breathing and respiratory distress.
Potentially, a more plausible theory of why tracheostomy might benefit a patient in terms of weaning would be reduced work of breathing because of a decrease in gas flow resistance in a tracheostomy tube, as compared to an ETT.
The down side is that circuits require considerable effort to open inspiratory valves to allow gas flow, causing increased work of breathing.
This review clearly indicates that breathing control is likely to have a detrimental effect on dyspnoea and work of breathing in people with severe COPD ([FEV.sub.1] %predicted 30-50).
* The goals of ventilation include oxygenation, lung protection, reduced work of breathing, acid-base balance and that the patient should be comfortable on the ventilator.
According to the company, the Hi-VNI Technology flushes the carbon dioxide heavy and oxygen depleted exhaled air from the respiratory dead space in the upper airway between breaths, replaces it with optimally humidified oxygen rich breathing gas, providing non-invasive ventilatory support and reducing the work of breathing.
In the ED, she was given 3 doses of nebulized racemic epinephrine with improvement in stridor and work of breathing. She was admitted to the medical intensive care unit (MICU), where she remained tachypneic with stridor and paradoxical abdominal breathing.
Salma Shaikh informed that in winter season, pneumonia could cause infection of small air sacs of the lungs and surrounding tissues, which could develop inflammation and deterioration of lung function and the lungs become unable to easily transfer oxygen to the blood and ensuring smooth work of breathing, she added.
In hospital, the main goals are to reduce the work of breathing and tachypnea and increase oxygen saturation in the blood.
Ventilators can help reduce the work of breathing by unloading the ancillary respiratory muscles, but they are often bulky and heavy, creating additional limitations for users.
If the calculated number is greater than 104 the patient, again in all probability, will not be capable of performing the work of breathing when extubated.