What are some key nursing theories or conceptual models that play a significant role in nursing practice? Select one of these theories or conceptual models and discuss how it can be applied in a health care scenario for a patient with complex needs.

Initial discussion question posts should be a minimum of 200 words and include at least two references cited using APA format. Responses to peers or faculty should be 100-150 words and include one reference. Refer to "RN-BSN Discussion Question Rubric" and "RN-BSN Participation Rubric," located in Class Resources, to understand the expectations for initial discussion question posts and participation posts, respectively.