The percent predicted FEV1 represents the maximum volume of air expired one second after the onset of full expiration compared to that predicted for one's age, sex, height, and race.
In the unadjusted logistic regression, the odds of a false positive result were higher for the 1,108 test kits used ≤1 month before expiration, compared to 1,251 kits with ≥6 months until expiration (Odds Ratio (OR) 14.8, 95% CI 1.94 113.6, p = 0.009).
During forced maximum breathing, only COPD patients with severe COPD (GOLD stage 3) showed significant differences in ΔF at maximum inspiration and expiration compared to healthy subjects (p = 0.0008).
We found that the rate of false positive results was significantly higher for oral rapid HIV test kits used with ≤1 month remaining until expiration as compared to kits used with ≥6 months remaining until expiration, after adjustment for the effects of technician and site.
EFL was defined if no change in flow occurred over all or part of the disconnected expiration as compared to the baseline breath and no EFL (NFL) if any increase in flow during the expiration was present (Fig. 1).
During relaxed breathing expiration can be compared to a RC-circuit with R being the airway resistance, C the respiratory system compliance and τ = R∙C the expiratory time constant.
The catheter tip location moved on average 9 mm (range 0-25 mm) cephalad during inspiration compared to expiration (P=0.001) in relation to the superior cavoatrial junction.
Measurements of the catheter tip location and central venous structures were obtained from inspiratory and expiratory phase images in each patient and compared using the paired t test.The length of the SVC and superior mediastinum were significantly longer during inspiration compared to expiration (9 mm and 7 mm respectively, P<0.001 for both).
We also apply three packet-dropping policies (drop the tail, drop randomly, and drop the oldest) for Bubble in simulation and only present the results of the best policy here, i.e., drop the oldest (as the probability that the oldest packet would be delivered before expiration is relatively low compared to those with long residual lifetimes).
Thus, a positive result (that is, positive cyclic pressure change) indicates that the pressure was higher during inspiration compared to expiration.
As compared to expiration, inspiratory right ventricular outflow tract velocity time integral (surrogating stroke volume) was 103 ± 4%, 109 ± 5%, and 100 ± 4% for NAVAlow, NAVAal, and NAVAhigh and 101 ± 3%, 89 ± 6%, and 83 ± 9% for PSVlow, PSVal, and PSVhigh, respectively (p < 0.001 level-mode interaction, ANOVA).
