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Microliter quantities of normal canine tracheobronchial mucus were obtained by direct sampling from the tracheas of anesthetized dogs. The rheological properties of the mucus samples were determined using a newly developed magnetic rheometer. The data show a very rapid decrease in dynamic viscosity with increasing frequency, and a much less rapid increase in elasticity. Mean values of elasticity and viscosity at 1 rad-s-1 for seven dogs were ca. 300 dyn-cm-2 and ca. 75 P, respectively. The steady-state viscosity values were ca. 3 X 10(4) P, i.e., two orders of magnitude higher than the highest dynamic values measured. The significance of the rheological behavior in terms of the clearance of secretions from the lung is discussed.
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