I need to choose a middle range theory that can be applied to nursing research? The subject in Nursing Theory

The theory of a balance between analgesia and side effects is the first integrative prescriptive middle range pain management theory. Even though it is based on pain management guidelines and is consistent with them, the theory provides a broader overview. Its general principles of acute pain management are a framework for research and a guide for nursing practice and education. The theory presents a new perspective that the best pain management practice is an integrated one that combines analgesic medications with nonpharmacological adjuvants, careful nursing care, and patient participation. The goal of the theory is to achieve a more holistic relief outcome than analgesia...