Final answer:
When assisting with a thoracentesis, the nurse should wear goggles and a mask, cleanse the procedure area with an antiseptic, and apply pressure to the site after the procedure.
Step-by-step explanation:
When assisting a provider performing a thoracentesis at the bedside of a client, the nurse should take the following actions:
Wear goggles and mask: This is important to protect the nurse from any potential splashes or aerosolized particles.
Cleanse the procedure area with an antiseptic: This is necessary to reduce the risk of infection.
Apply pressure to the site after the procedure: Applying pressure can help prevent bleeding.
Other actions mentioned in the options are not necessary during a thoracentesis. Encouraging the client to cough can be harmful, as it may increase the risk of complications. Keeping the client in a supine position is not required, and administering pain medication after the procedure depends on the client's individual needs and provider's instructions.