Final answer:
The nurse's first intervention should be to provide perineal care, followed by repositioning the client.
Step-by-step explanation:
The nurse's first intervention after removing a bedpan from under a debilitated client who has just had a bowel movement should be to provide perineal care. This involves cleaning the client's genital to maintain hygiene and prevent infection. It is important to prioritize perineal care to ensure the client's comfort and well-being.
After providing perineal care, the nurse should then proceed to reposition the client. This is necessary to prevent pressure ulcers and maintain proper body alignment. Repositioning helps distribute weight, relieve pressure on certain areas, and promote blood circulation.
The other options listed in the question, such as documenting results and covering the client with top linens, can be addressed after perineal care and repositioning, as they are not immediate priorities.