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 ?
Three maximal flow-volume loops were measured to gain baseline measures and were accepted in accordance with European Respiratory Society and American Thoracic Society criteria (Miller et al.
Prior to each 3 km time-trial participants completed resting maximal flow-volume loops, performed in triplicate.
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).
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.
Our patient's pulmonary function tests demonstrated that the expiratory limb of flow-volume loops is flattened, while the inspiratory portion is unchanged.
These two cases althought due to different etiologies, illustrate how flow-volume loops findings can give insight into the clinical entities that may affect a patient.
Flow-volume loops have been used for the detection of respiratory disorders of both the lung (intrathoracic) and the upper airway or extra-thoracic airway (trachea to mouth) (1-2).
Tidal breathing flow-volume loops and passive respiratory mechanics were evaluated using a face mask while the newborns were calm and awake.
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.