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Cushing's syndrome after hemodialysis for 21 years
Koki Mise1, Yoshifumi Ubara, Keiichi Sumida
1Nephrology Center, Toranomon Hospital Kajigaya, 1-3-1, Kajigaya, Takatu-ku, Kawasaki-shi, Kanagawa-ken, 213-0015, Japan. kokimise@yahoo.co.jp
Insights
This case report details the first instance of adrenal Cushing's syndrome in a hemodialysis patient, presenting with hypokalemia and obesity. Treatment involved medication and adrenalectomy, resolving the patient's critical clinical issues.
Area of Science:
- Endocrinology
- Nephrology
- Surgical Oncology
Background:
- Hyperkalemia and weight loss are common challenges in hemodialysis patients.
- Adrenal Cushing's syndrome is rarely reported in this population, especially with central obesity and hypokalemia.
Observation:
- A 61-year-old woman on chronic hemodialysis for 21 years developed persistent hypokalemia and central obesity.
- Endocrinological evaluation revealed increased cortisol secretion without a circadian rhythm and suppressed ACTH, indicative of adrenal Cushing's syndrome.
Findings:
- Laparoscopic left adrenalectomy successfully removed an adrenal adenoma.
- Post-surgery, hypokalemia resolved without medication, and weight gain ceased, confirming the diagnosis and effective treatment.
Implications:
- This case highlights the importance of considering adrenal Cushing's syndrome in hemodialysis patients with unexplained hypokalemia and obesity.
- Early diagnosis and surgical intervention can significantly improve patient outcomes and quality of life.
Context:
Hyperkalemia and weight loss are critical clinical problems for hemodialysis patients. There have been no documented reports of adrenal Cushing's syndrome with central obesity and hypokalemia in a hemodialysis patient.
Objective:
The aim of the study was to report a patient with Cushing's syndrome after chronic hemodialysis, review the published literature, and discuss the significance of hypokalemia and obesity in anuric hemodialysis patients from the perspective of cortisol metabolism.
Patient:
A 61-yr-old woman who had been on hemodialysis for 21 yr presented with persistent hypokalemia and central obesity. In 2002, her dry weight was 48.1 kg, but thereafter she gained weight to 60 kg.
Results:
Adrenal Cushing's syndrome was diagnosed from endocrinological findings such as increased cortisol secretion without a circadian rhythm and suppression of plasma ACTH. Spironolactone was administered (25 to 50 mg/d), and her serum potassium became normal. Then, left adrenalectomy was performed by laparoscopic surgery. The resected specimen contained a well-circumscribed adrenal adenoma expressing P450c17. After surgery, hypokalemia improved gradually without medication, and her weight gain stopped.
Conclusions:
This is the first documented case of adrenal Cushing's syndrome in a patient on long-term hemodialysis, although several authors have reported a relation between hypokalemia and primary hyperaldosteronism in hemodialysis patients.
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