A nurse is providing preoperative teaching about patient-controlled analgesia (PCA) to a client. Which of the following statements should the nurse include in the teaching?

Rationale: A. PCA (patient-controlled analgesia) is designed to maintain relatively stable plasma drug levels by providing a basal (continuous) infusion and/or patient-activated bolus doses. The goal is to prevent peaks and troughs in pain control, not to create fluctuating medication levels. B. Clients are taught to anticipate pain and use the PCA button before activities such as ambulation, coughing, or turning. This allows the medication time to take effect and provides better pain control during movement or procedures. C. Clients do not control the dosage amount or settings of the PCA. The healthcare provider prescribes the dose limits, lockout interval, and basal rate if ordered. The client can only self-administer preset doses by pressing the button. D. PCA devices have lockout intervals that prevent additional doses from being delivered too close together. Pressing the button multiple times will not result in a double dose; it will only deliver medication according to the preset safety parameters.