Hypoaldosteronism differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sargun Singh Walia M.B.B.S.[2] Akshun Kalia M.B.B.S.[3]

Overview

Hypoaldosteronism must be differentiated from other diseases that cause hypotension and muscle weakness such as Addison's disease, salt-depletion nephritis, myopathies, celiac disease, Peutz-Jeghers syndrome, anorexia nervosa, syndrome of inappropriate anti-diuretic hormone (SIADH), neurofibromatosis, porphyria cutanea tarda, and bronchogenic carcinoma. In addition, measurement of plasma renin activity (PRA), serum aldosterone, and serum cortisol is used to differentiate among various subtypes of hypoaldosteronism.

Differentiating Hypoaldosteronism from other Diseases

  • Various subtypes of hypoaldosteronism can be differentiated on the basis of plasma renin activity (PRA), serum aldosterone, and serum cortisol. These tests are performed after maintaining an upright position for three hours. Under normal conditions, maintaining an upright position for long duration activates the neuro-hormonal regulation by the kidneys which leads to increased renin and aldosterone release.
  • The following table distinguishes among various subtypes of hypoaldosteronism:


Disorder Plasma Renin Activity Plasma Aldosterone Plasma Cortisol
Hyporeninemic hypoaldosteronism Low  Low  Normal
Hypereninemic hypoaldosteronism Increased Low  Normal/↓
Primary adrenal insufficiency High Low  Low 
Pseudohypoaldosteronism type I High High Normal
Pseudohypoaldosteronism type II Normal/↓ Normal/↓ Normal



Disease Differentiating symptoms Differentiating laboratory findings Gold standard test
Hypotension Abdominal pain Anorexia/

weight loss

Muscle weakness Hypoglycemia Skin pigmentation Other symptoms Hyponatremia Cortisol levels Other labs
Hypoaldosteronism + - +/- + - +/- Muscle tenderness +/- Normal ---
Addison's disease + + + + + + N/A + Low --- ACTH stimulation test
Salt-depletion nephritis + Flank pain - - - - + Elevated <15:1 BUN:CR ---
Myopathies

(polymyositis,

hereditary myopathies)

- - - + - Heliotrope rash and

Gottron's sign

- Normal N/A Muscle biopsy
Anorexia nervosa + - + + + - - Elevated N/A Psychiatric condition
Celiac disease - + + - - Dermatitis herpetiformis  - Normal N/A Abnormal small bowel biopsy
Syndrome of inappropriate anti-diuretic hormone

(SIADH)

- - - - - - N/A + Normal Water deprivation test
Neurofibromatosis - - + + - Axillary- and inguinal-area freckling - - N/A Biopsy of skin tissue
Peutz-Jeghers syndrome N/A + N/A N/A N/A + - Normal N/A Colonic imaging showing the small intestinal polyps
Porphyria cutanea tarda - + - - - Blisters on sun-exposed sites - Normal or elevated High level of porphyrins in the urine
Bronchogenic carcinoma - - + +/- - + - Elevated Increased ACTH and

Hypokalemia

Cytological or histological evidence of lung cancer in sputum, pleural fluid, or tissue

References

  1. Selva-O'Callaghan A, Labrador-Horrillo M, Gallardo E, Herruzo A, Grau-Junyent JM, Vilardell-Tarres M (2006). "Muscle inflammation, autoimmune Addison's disease and sarcoidosis in a patient with dysferlin deficiency". Neuromuscul. Disord. 16 (3): 208–9. doi:10.1016/j.nmd.2006.01.005. PMID 16483775.
  2. Kumar V, Rajadhyaksha M, Wortsman J (2001). "Celiac disease-associated autoimmune endocrinopathies". Clin. Diagn. Lab. Immunol. 8 (4): 678–85. doi:10.1128/CDLI.8.4.678-685.2001. PMC 96126. PMID 11427410.
  3. Adams R, Hinkebein MK, McQuillen M, Sutherland S, El Asyouty S, Lippmann S (1998). "Prompt differentiation of Addison's disease from anorexia nervosa during weight loss and vomiting". South. Med. J. 91 (2): 208–11. PMID 9496878.
  4. Lever EG, Stansfeld SA (1983). "Addison's disease, psychosis, and the syndrome of inappropriate secretion of antidiuretic hormone". Br J Psychiatry. 143: 406–10. PMID 6414566.
  5. BELL R, PATTEE CJ (1956). "Addison's disease associated with neurofibromatosis". Can Med Assoc J. 75 (5): 415–7. PMC 1823303. PMID 13356214.

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