flow-volume loop


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flow-volume loop

A graphic record of lung function in which the amount of gas inhaled and exhaled is recorded on the horizontal axis and the rate at which the gas moves on the vertical axis. It is used to detect abnormalities in pulmonary function such as those accompanying restrictive or obstructive lung disease.
See also: loop
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
However, after having performed and monitored flow-volume loops for lung transplant patients for 25 years, I have observed that even a 5 percent change in FEF25-75 can indicate beginning OB with associated lung transplant rejection.
Flow-volume loop showed a limited flow during both inspiration and expiration with flattening of both inspiratory and expiratory components, suggesting a fixed airway obstruction.
In the helium iso-flow maneuver, after the patient has taken in the three large breaths of heliox, the flow-volume loop is recorded.
The inspiratory volume per second calculated from a flow-volume loop quantifies an eventual laryngeal obstruction during inspiration and permits followup after treatment.