A nurse is caring for a client with hypertension who is part…

A nurse is caring for a client with hypertension who is participating in a nonpharmacologic blood pressure management program. The client is connected to an automatic blood pressure monitor that continuously measures blood pressure and emits audible tones that change in pitch as the blood pressure decreases. The client practices deep breathing and other relaxation exercises while listening to the tones and uses the auditory feedback to determine the effectiveness of the relaxation techniques. Which relaxation technique is the client using?