NURS 8250 Week 6 Middle-Range Theory Application Example

What the Theory Reorganized and What It Left Alone: Applying the Theory of Unpleasant Symptoms to Fatigue in Adults Receiving Chemotherapy at an Outpatient Infusion Center

Student Name

College of Nursing, Walden University

NURS 8250: Advanced Theoretical and Scientific Perspectives in Nursing

Instructor Name

Month Day, Year

What the Theory Reorganized and What It Left Alone: Applying the Theory of Unpleasant Symptoms to Fatigue in Adults Receiving Chemotherapy at an Outpatient Infusion Center

Fatigue as the Center Saw It

A middle-range theory should be able to say something specific about a real problem, or it has no business in project work. This paper tests the theory of unpleasant symptoms against fatigue among adults receiving chemotherapy at a composite outpatient infusion center that treats about 60 patients a day. Before any theory was applied, the center's approach to fatigue looked like this: nurses asked patients at each visit to rate fatigue from 0 to 10, recorded the number and, when it was high, suggested rest and gave a handout on energy conservation. Patients continued to describe fatigue as the symptom that most disrupted their lives, and the handout did not seem to help.

Fatigue related to cancer and its treatment is common and persistent, with contributors that include inflammation, anemia, disrupted sleep, depression and physical deconditioning (Bower, 2014). A problem with that many contributors is a good test of whether a theory can organize it.

The Theory

Lenz et al. (1997) describe three components. The first is the symptoms themselves, each of which can be described by how strong it is, when it comes, how much it troubles the person and what it feels like, which the theorists call quality. Next come influencing factors, which the theorists sort into three kinds, bodily, mental and circumstantial (physiological, psychological and situational), which affect whether and how symptoms are experienced. Performance, the third, covers what symptoms do to a person's ability to act and think, at work, at home and in daily tasks. The updated theory adds two claims important here: symptoms often occur together and can multiply each other's effects, and performance feeds back to influence both the symptoms and the influencing factors.

What the Theory Reorganized

Fatigue became more than a number. The theory's four dimensions showed that a single 0 to 10 rating captured only intensity. Applying the theory, the nurses began asking about timing, whether fatigue peaked in the days after treatment or built across cycles, distress, how much it bothered the person, and quality, whether it felt like sleepiness, weakness or a mental fog. Two patients with the same rating could differ on every other dimension, and the differences pointed to different responses.

Fatigue was placed in a cluster. The claim that symptoms occur together changed the assessment. Patients with high fatigue often also reported poor sleep, low mood and pain. The theory suggests these interact, so treating fatigue alone may fail if disturbed sleep or depression is feeding it. Bower (2014) similarly describes fatigue as linked to sleep disruption and depressive symptoms, which gives the theory's claim practical weight.

Influencing factors became a checklist the nurses could use. Physiological factors pointed to anemia and thyroid function, psychological factors to anxiety and depression, and situational factors to work, child care and the long drive some patients made to the center. The situational category was the biggest change, because the center's previous approach had treated fatigue as purely physiological.

The feedback loop changed the advice. The theory's claim that reduced performance feeds back into symptoms challenged the rest-first handout. A patient who rests for weeks becomes less fit, and deconditioning makes fatigue worse. That reading is consistent with a meta-analysis that found exercise and psychological interventions, and the two together, reduced cancer-related fatigue more than the pharmaceutical options studied (Mustian et al., 2017). The center replaced the rest handout with a referral pathway for supervised activity and a brief psychological intervention.

One Patient Through the Theory

A composite patient shows the change. Mrs. F., 61, receives chemotherapy every three weeks for breast cancer and works part time at a bank. Under the old approach, her fatigue was recorded as 7 of 10 at each visit, and she was given the rest handout. Under the theory, the nurse learned that the fatigue peaked on days three to six after each treatment, that it distressed her most because she could not concentrate at work and that it felt like a fog rather than sleepiness. The nurse also learned that she slept poorly after steroid doses given with treatment, felt low since her diagnosis and drove an hour each way to the center.

Each of those findings points to a different response. The timing suggested planning work around the worst days. The cognitive quality and poor sleep suggested discussing sleep with the oncology team. Low mood pointed to a screening conversation and possible referral. And the long drive, a situational factor, suggested coordinating visits so she made fewer trips. None of these responses would have followed from a single number.

What the Theory Left Untouched

It did not tell the nurses what to do. The theory organizes assessment and explains relationships, but it does not specify interventions. The shift toward activity came from the evidence on treatments, read through the feedback loop, not from the theory itself.

It did not address treatment decisions. Some patients' fatigue was severe enough that they wondered whether to reduce or stop chemotherapy. The theory describes symptoms and performance but offers nothing on how patients weigh symptoms against the benefits of treatment, which is often the most important conversation about fatigue.

It did not capture meaning. One patient described fatigue as a sign that the treatment was working; another saw it as a sign she was dying. The theory's dimension of distress registers how much fatigue bothers a person, but not what it means to them, and meaning shaped how each patient responded to advice.

Its measures were not ready-made. The theory does not come with a single instrument for all four dimensions, so the center had to choose among existing fatigue scales or add questions of its own, which raised questions about comparability over time.

What the Test Shows

The theory of unpleasant symptoms passed the test of saying something specific. It changed how the center assessed fatigue, broadened the causes the nurses considered and, through its feedback claim, undermined advice that may have been making fatigue worse. It did not choose interventions, guide treatment decisions or account for what fatigue meant to patients. For a DNP project at the center, the theory would be a sound framework for assessment and for organizing measures, supplemented by treatment evidence for intervention design and by attention to patients' own interpretations. That division of labor is the practical result of asking what a middle-range theory does and does not do.

References

Bower, J. E. (2014). Cancer-related fatigue: Mechanisms, risk factors, and treatments. Nature Reviews Clinical Oncology, 11(10), 597-609. https://doi.org/10.1038/nrclinonc.2014.127

Lenz, E. R., Pugh, L. C., Milligan, R. A., Gift, A., & Suppe, F. (1997). The middle-range theory of unpleasant symptoms: An update. Advances in Nursing Science, 19(3), 14-27. https://doi.org/10.1097/00012272-199703000-00003

Mustian, K. M., Alfano, C. M., Heckler, C., Kleckner, A. S., Kleckner, I. R., Leach, C. R., Mohr, D., Palesh, O. G., Peppone, L. J., Piper, B. F., Scarpato, J., Smith, T., Sprod, L. K., & Miller, S. M. (2017). Comparison of pharmaceutical, psychological, and exercise treatments for cancer-related fatigue: A meta-analysis. JAMA Oncology, 3(7), 961-968. https://doi.org/10.1001/jamaoncol.2016.6914