What is the immediate action a PN should take when a bedfast client becomes dyspneic during repositioning?

The most appropriate immediate action when a bedfast client becomes dyspneic during repositioning is to raise the head of the bed. This action can quickly help alleviate respiratory distress by improving airflow and reducing the effort required for breathing. Positioning the client in a more upright position allows for an expansion of the thoracic cavity, making it easier for them to breathe and improving oxygenation.

Elevating the head of the bed provides immediate relief and can help stabilize the client's condition until further assessments and interventions, such as oxygen administration or calling for assistance, can be performed. Therefore, starting with this positioning is a critical first step in managing the acute situation of dyspnea.