A dosimetric cumulative inhalation of methacholine was used and the response was measured by the dose which increases baseline end interruption resistance by 100% (PD100Rint, EI) as well as by percent dose response ratio (DRR).
20 A key limitation of our study, which must be considered in interpreting these results, is the lack of random assignment of treatment and dose, which increases risk for confounding.
A Cox regression model with the time-dependent factor was modelled to assess the effect of the cumulative 5-FU dose, which increases with time from the first to the last treatment delivery.
Data was assessed by using two different estimates: 1) provocation dose which increases Rint, EI by 100% (PD100Rint, EI), calculated by interpolation from the last two points of the cumulative semilogarithmic dose-response diagram, and 2) the percent slope (dose-response ratio-DRR) of a line extending from the origin to the last point of the curve (DRR) [ 16].
Moreover, antioxidant dietary supplements require the administration of high doses, which increases mortality, likely due to their indiscriminate effects on all ROS16.
Firstly, the samples irradiated with X-rays were exposed to higher overall doses which increase the probability of inducing DNA double strand breaks.
71 An alternative strategy for improving MTX tolerability is twice-weekly dosing, which increases the bioavailability of MTX above once-weekly dosing 72; a preliminary study, however, did not demonstrate an efficacy advantage over once-weekly dosing.
However, the local effects of BTX-A plateau at a certain dose beyond which increased BTX-A administration does not add therapeutic benefit [29].
If mannitol affected only RBF in the present study, with no increase in GFR or RVO2, one would have expected a decrease in renal oxygen extraction, as was seen with low-dose dopamine, which increased RBF with no effects on the GFR or the RVO2 [ 44].
