Which assessment methods register higher values of peak cough flow in healthy subjects

There are different instruments to assess the peak cough flow (PCF): pneumotachometer (PN) and portable peak expiratory flow-meter (PEF). On the other hand, this measure can be made using a mouthpiece or using a facemask. Aim: To compare both instruments and interfaces in the measurement of PCF in healthy adult population. Methods: A cross-sectional study was carried out in 31 healthy subjects. People with obesity, active smokers, athletes or with respiratory, severe cardiac and/or neurological pathologies, were excluded. Forced spirometry was performed to rule out altered ventilatory patterns. PCF values were taken using a PN and a PEF meter, each one connected to the two mentioned interfaces. Thus, four measurements were obtained for each individual. The order of maneuvers was randomized. Three technically acceptable maneuvers (variability Results: Seventeen males and 14 females were assessed (35.7±12.4 years). In the comparison of the instrument for PCF evaluation, 78L/min more were recorded with the PEF meter when mouthpiece was used. A difference of 34L/min was obtained in favor of the PEF meter using the facemask. In the comparison of the interface, only a significant difference of 22L/min was observed using PN connected to the facemask. Conclusions: The PCF value was higher when we used a PEF meter with a mouthpiece.