Deposition of Dry Powder Generated by Solovent in Sophia Anatomical Infant Nose-Throat (SAINT) Model

Purpose: To quantify deposition of 99mtechnetium-labeled powder in the Sophia Anatomical Infant Nose-Throat (SAINT) model of a 9-month old. Methods: Powder was generated by the Solovent (BD Technologies), an active dry powder inhaler with spacer, during 30 seconds of tidal volume (TV) breathing. Activity that passed through the model was captured on a filter and represented powder that was available for deposition in the lungs. Deposition in the nasal cavity, on the filter, and in the spacer was expressed as a percentage of the injected dose into the spacer. Results: Mean (± SD) injected dose averaged 89.5 ± 0.09%, 90.3 ± 0.11%, and 91.3 ± 0.05% at 50, 100, and 200 mL TV, respectively. Mean nasal deposition increased significantly from 50 mL to 100 mL and 200 mL TV with 0.60 ± 0.002%, 1.72 ± 0.007%, and 6.75 ± 07.21%, respectively (all p ≤ 0.05). Similarly, mean filter deposition increased significantly from 50 mL to 100 mL to 200 mL with 0.28 ± 0.00%, 1.14 ± 0.00%, and 3.87 ± 0.01%, respectively (all p <...