work of breathing

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work of breathing (WOB)

the effort required to inspire air into the lungs. WOB accounts for 5% of total body oxygen consumption in a normal resting state but can increase dramatically during acute illness.

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 ?
The non-elastic work of breathing through endotracheal tubes of various sizes.
Additional inspiratory work of breathing imposed by tracheostorey tubes and non-ideal ventilator properties in critically ill patients.
The use of an abdominal binder while sitting to provide support for the abdominal wall and decrease the work of breathing is recommended until spinal shock resolves.
Adjustable slope/rise and expiratory threshold controls give RTs the tools to decrease a patient's work of breathing and improve synchrony while expediting the weaning process.
Assuming flow and resistance are unchanging as the chest inflates, so too is the amount of pressure needed to overcome the flow-resistive component of the work of breathing.
Because the strip reduces the work of breathing, horses experience less physical stress during and after heavy exercise.
The SBT is performed by allowing the patient to breathe with a minimal level of Pressure Support or flow-by while monitoring their Rapid Shallow Breathing Index, Work of Breathing and hemodynamic parameters.
The patient's exhalation is assisted by the "Coanda Effect" (Fluidic Flip) which eliminates expiratory resistance and reduces the work of breathing while maintaining NCPAP therapy.
If ventilation is spontaneous, the work of breathing rises exponentially (as a quadratic) as the need for ventilation increases, often overtaxing weakened respiratory muscles.
This indicates that barotrauma was minimized to reduce the severity of chronic lung disease and that work of breathing was reduced, sparing calories for growth.