Final answer:
The nurse should adjust the wall suction apparatus to a pressure of 170 mm Hg. The suction catheter should be the appropriate size and lubricated with water-soluble lubricant.
Step-by-step explanation:
The nurse should plan to adjust the wall suction apparatus to a pressure of 170 mm Hg when suctioning secretions from a client with a new tracheostomy. This pressure setting allows for effective removal of secretions without causing harm to the client's airway. It is important to select a suction catheter that is appropriate in size for the tracheostomy tube to avoid damage to the airway. The nurse should also apply water-soluble lubricant to the end of the suction catheter to facilitate insertion and minimize discomfort for the client.