Flow-volume loop | definition of flow-volume loop by Medical dictionary
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a graph of the rate of airflow as a function of lung volume during a complete respiratory cycle consisting of a forced inspiration followed by a forced expiration. The plotted curve appears as a loop and is used in assessing pulmonary function.
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.
References in periodicals archive
The flow-volume loop
is generated by continuously recording flow and volume with an electronic spirometer during a forced inspiratory and expiratory vital capacity maneuver.
This is evident by the measurable increase in the helium iso-flow or VisoV, which is located in the later part of the flow-volume loop
with similar flow rates.
It becomes very evident that a patient is trying to change his spirometric results by observing the variation in flow-volume loop
Our patient's pulmonary function tests demonstrated that the expiratory limb of flow-volume loops
is flattened, while the inspiratory portion is unchanged.