flow-volume loops

flow-volume loops

graphical representation of the relation between inspiratory and expiratory airflow and the change in volume of the lungs; used in the assessment of lung function with respect to patency or obstruction of the airways, e.g. in the assessment of asthma.
References in periodicals archive ?
2) They can display expiratory and inspiratory manoeuvres in real time as flow-volume loops, allowing instant pattern recognition.
This allows the recording of inspiration and expiration, and generation of flow-volume loops (on a flow-type spirometer).
Variable and fixed large airway obstruction often gives rise to strikingly abnormal flow-volume loops.
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.
The use of the flow-volume loop in the pulmonary function laboratory or in the clinic serves as an effective and accurate screen for the detection of lung rejection.
The flow-volume loop should be performed using a device which meets all American Thoracic Society/European Respiratory Society standards for sensitivity and accuracy.
Our patient's pulmonary function tests demonstrated that the expiratory limb of flow-volume loops is flattened, while the inspiratory portion is unchanged.
McFadden and Zawadski described cases of "choking" (that is, unexpected poor performance) in athletes that were caused by vocal cord dysfunction and showed examples of flow-volume loops suggesting vocal cord dysfunction (11).
Clues for asthma include peak flow changes of >20% with symptoms, flow-volume loops, and atopic status.
The monitor also displays pressure-volume and flow-volume loops that can be compared in real time with reference loops.
These studies looked at the effect that different gases have on the shape and characteristics of flow-volume loops.
Forced expiratory vital capacity maneuvers (FVC) using heliox, which is 80 percent helium and 20 percent oxygen, are performed, and their resultant flow-volume loops are superimposed.