NUR 315 Module 8 Final Project: Case Analysis example

One Hormone, Every System: A Case Analysis of Cushing Syndrome From Long-Term Prednisone

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Southern New Hampshire University

NUR 315: Pathophysiology for Nurses

Final Project: Case Analysis

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[Date]

The organization, setting and figures below are a composite written as a model document. No real employer, client, colleague or patient is described.

One Hormone, Every System: A Case Analysis of Cushing Syndrome From Long-Term Prednisone

Introduction

Cushing syndrome is the collection of changes produced by prolonged exposure to excess glucocorticoid. The most common cause is not a tumor but medication: glucocorticoids such as prednisone are prescribed widely for inflammatory and autoimmune conditions, and taken at higher doses for months they reproduce the effects of the body's own cortisol in excess (Lacroix et al., 2015). This analysis follows one patient receiving long-term prednisone. It argues that his apparently unrelated problems, a rounder face, fragile skin, weak thighs, high blood sugar, high blood pressure, a spinal fracture and repeated infections, are all expressions of a single hormonal excess, and that the same excess has silenced his own adrenal glands in a way that becomes dangerous if the drug is stopped.

Case Presentation

A 46-year-old high school chemistry teacher was diagnosed with pulmonary sarcoidosis 14 months ago and has taken prednisone since then, at 40 mg daily for the first three months and 20 mg daily since. His breathing has improved, but he has gained 13 kilograms, mostly around his abdomen, and his face has become round. He bruises easily, and a minor scrape on his forearm took weeks to heal. Climbing the stairs to his classroom has become difficult, and he has trouble rising from a low chair. He sleeps poorly and feels irritable. Two weeks ago he developed sudden back pain after lifting a box.

On examination he has a round, flushed face, a fat pad at the base of the neck, thin skin with bruises on both forearms, and wide purple striae on the abdomen. His thigh muscles are weak on testing. Blood pressure is 158/96 mmHg. Fasting glucose is 168 mg/dL and hemoglobin A1c is 7.4 percent, compared with 5.6 percent before treatment. Potassium is 3.3 mmol/L. A spine radiograph shows a compression fracture of the first lumbar vertebra. An early morning cortisol level, drawn before his daily dose, is very low, as is his adrenocorticotropic hormone.

The Normal Stress Hormone Axis

Cortisol is produced by the adrenal cortex under the control of the hypothalamic-pituitary-adrenal axis. The hypothalamus releases corticotropin-releasing hormone, which stimulates the pituitary to release adrenocorticotropic hormone, which in turn stimulates the adrenal cortex to make cortisol. Cortisol then feeds back to the hypothalamus and pituitary to reduce their output, keeping levels within a daily rhythm that peaks in the early morning (Rogers, 2023).

Cortisol acts on nearly every tissue through the glucocorticoid receptor. In normal amounts it raises blood glucose during stress, shifts fuel use from glucose to fat and protein, supports blood pressure, and restrains inflammation and immune responses. These are useful effects in the short term. The drug prednisone acts on the same receptor, which is why it is effective against inflammation and why, in prolonged high doses, it produces every other cortisol effect as well.

Mechanism, System by System

Glucose and fat. Glucocorticoid excess increases glucose production by the liver and reduces the effect of insulin in muscle and fat, producing hyperglycemia. The patient's rising A1c reflects this steroid-induced diabetes. Excess glucocorticoid, together with high insulin levels, also redistributes fat toward the face, the base of the neck and the abdomen while the limbs stay thin, which explains his rounded face, neck fat pad and central weight gain (Lacroix et al., 2015).

Muscle, skin and connective tissue. Glucocorticoids break down protein to supply amino acids for glucose production. In skeletal muscle, especially the large proximal muscles of the thighs, this causes wasting and weakness, explaining his difficulty with stairs and chairs. In the skin, reduced collagen production thins the dermis, so small vessels are easily damaged, causing bruising, and stretched skin over expanding fat tears internally, forming wide purple striae. Poor collagen formation and suppressed inflammation together slow wound healing.

Bone. Glucocorticoids suppress osteoblasts, the cells that build bone, and increase bone resorption, while also reducing calcium absorption from the gut. Bone loss is fastest in the first months of treatment and affects the spine most, which explains a vertebral compression fracture from a minor lift in a man of his age.

Blood pressure and potassium. At high levels, glucocorticoids activate the mineralocorticoid receptor in the kidney, causing sodium retention and potassium loss, and they increase vascular sensitivity to vasoconstrictors. These effects explain his hypertension and low potassium. Immunity and mood. Glucocorticoids reduce the number and function of several immune cells and dampen inflammation, increasing the risk of infection and slowing healing, and they affect the brain, producing insomnia, irritability and sometimes more serious mood changes.

The Silenced Adrenal Glands

The most dangerous effect is the least visible. Because prednisone activates the same feedback pathway as cortisol, the hypothalamus and pituitary sense a high glucocorticoid level and reduce their output. Months of low adrenocorticotropic hormone cause the adrenal cortex to shrink and lose its capacity to produce cortisol. His very low morning cortisol and adrenocorticotropic hormone confirm this suppression.

The consequence is that his body now depends on the drug. If prednisone were stopped suddenly, or if he developed a severe illness or needed surgery without extra steroid coverage, his adrenal glands could not respond, and he could develop adrenal crisis, with low blood pressure, shock, low blood sugar and electrolyte disturbances. Recovery of the axis after long-term treatment takes months, which is why glucocorticoids must be tapered gradually rather than stopped.

Linking Findings to Mechanisms

Each finding in this patient can be matched to a cause, as set out below.

Table 1

Findings in the Case and Their Mechanisms

Diagnosis and Treatment

In endogenous Cushing syndrome, diagnosis requires tests showing excess cortisol production, such as late-night salivary cortisol or 24-hour urine cortisol (Nieman et al., 2008). In exogenous Cushing syndrome, the diagnosis rests on the history of glucocorticoid use and the typical findings, and the low cortisol and adrenocorticotropic hormone confirm that the patient's own axis is suppressed rather than overactive. Measuring cortisol by standard tests can be misleading because prednisone itself may not be detected in the same way.

Treatment aims to reduce glucocorticoid exposure as far as the underlying disease allows. His provider plans a slow taper of prednisone while adding a steroid-sparing medication for sarcoidosis, with the pace guided by his symptoms and, later, by tests of adrenal recovery. Each complication is treated in its own right: glucose-lowering medication for hyperglycemia, blood pressure control, potassium replacement, bone-protective therapy with calcium and vitamin D, and physical therapy for strength. Many features improve over months once exposure falls, though bone loss may not fully reverse (Lacroix et al., 2015).

Nursing Implications

The most important teaching is never to stop prednisone suddenly and to follow the taper exactly. The patient needs to know that during illness, vomiting or surgery he may need additional steroid coverage, that he should carry information about his steroid use, and that dizziness, severe weakness, vomiting or confusion during a taper require urgent care. The nurse monitors blood glucose and teaches home glucose checks, tracks blood pressure and potassium, and watches for infection, remembering that fever and inflammation may be blunted.

Safety and function are also nursing concerns. Proximal weakness and a recent fracture raise his fall risk, so the nurse supports physical therapy and home safety measures. Skin care protects fragile skin from tears and pressure. Finally, the nurse acknowledges the emotional burden of a changed appearance and disrupted sleep, and checks for mood changes that may need further evaluation.

Conclusion

This patient's findings share a single cause: prolonged exposure to a synthetic glucocorticoid that acts wherever cortisol acts. Excess hormone raised his blood glucose, redistributed his fat, broke down muscle and skin, weakened his bones, raised his blood pressure and dampened his immune defenses. Through normal feedback, the same excess suppressed his own adrenal glands, leaving him dependent on the drug. Understanding that chain explains his presentation, the need for a gradual taper, the treatment of each complication and the teaching that keeps him safe while his adrenal function recovers.

References

Lacroix, A., Feelders, R. A., Stratakis, C. A., & Nieman, L. K. (2015). Cushing's syndrome. The Lancet, 386(9996), 913-927. https://doi.org/10.1016/S0140-6736(14)61375-1

Nieman, L. K., Biller, B. M. K., Findling, J. W., Newell-Price, J., Savage, M. O., Stewart, P. M., & Montori, V. M. (2008). The diagnosis of Cushing's syndrome: An Endocrine Society clinical practice guideline. The Journal of Clinical Endocrinology & Metabolism, 93(5), 1526-1540. https://doi.org/10.1210/jc.2008-0125

Rogers, J. L. (Ed.). (2023). McCance & Huether's pathophysiology: The biologic basis for disease in adults and children (9th ed.). Elsevier.