A nurse is caring for a client who is postoperative and has a PCA pump. Which of the following assessments should the nurse make in the first 24 hr following initiation of the PСА?

Check the client's pulse oximetry level every 6 hr.

Check the client's blood pressure every 4 hr.

Check the client's respirations every 2 hr.

Assess the client's apical heart rate every 8 hr.