The two rules students break
1. The etiology can never be a medical diagnosis. You cannot independently treat pneumonia, so “related to pneumonia” leaves you nothing to do. Write the part you can treat — retained secretions, guarding with movement, immobility, unfamiliar environment.
2. A risk diagnosis has only two parts. Risk label plus risk factors. There is no “as evidenced by,” because if there were evidence the problem would already exist and it would no longer be a risk.