A respirаtоry therаpist hаs оbserved thickening оf secretions on a intubated patient on CMV. Ventilator settings are: Mode - Assist control Frequency - 22 breaths/min Tidal volume - 400 ml FIO2 - 50% The peak pressures have increased with the use of an HME. What should the practitioner do at this time to help resolve the retained thick secretions?