Lung Diseases Clinical Trial
To modify and expand an existing pharmacokinetic model for nasal dose as well as to develop a new model to estimate tracheobronchial dose of an active agent for each subject in a study of acute respiratory health effects.
BACKGROUND:
Epidemiologic analysis of acute, reversible respiratory health effects is uncommonly
performed, yet these are important health outcomes because acute responses by the
respiratory defense system appear to represent one end of the continuum toward progressive,
chronic and potentially disabling physiologic changes. Repeatable epidemiologic studies of
dose-response relationships necessitate accurate measures of 'dose'. However, in
occupational and environmental settings, exposure to a toxin is seldom found at identical
concentrations and/or particle sizes among persons with the same activity patterns. In
addition, air concentration does not account for factors such as clearance or metabolism
which may alter the biologically effective tissue dose. These factors cause the target
tissue dose of the toxin to vary greatly despite exposure to similar air concentrations.
DESIGN NARRATIVE:
The results of these toxicokinetic models were individual measures of tissue dose used in a
2-stage epidemiologic analysis which placed special emphasis on the definition of individual
dose-response curves for exposure to an irritant dust, sodium borate, and the reversible
effects of peak expiratory flow and irritant symptoms. A primary advantage of the two stage
epidemiologic approach was that it permitted particular attention to be focused on the
factors which determined the sensitivity (threshold) and reactivity (slope) for an
individual. The use of tissue dose estimates were also compared to simple exposure
measurements in the epidemiologic analysis to evaluate the efficacy of using dosimetric
methods in epidemiologic studies.
The study completion date listed in this record was obtained from the "End Date" entered in
the Protocol Registration and Results System (PRS) record.
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N/A
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