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CAH - desmolase deficiency — Clinical Guidelines

Overview

Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency, often referred to as desmolase deficiency, results from mutations in the CYP21A2 gene leading to impaired cortisol synthesis and subsequent overproduction of androgens. This condition manifests with a spectrum of clinical presentations ranging from salt-wasting crises to simple virilizing forms 1 2 3 4 5.

Diagnosis

Clinical Presentation: Hypertension, hyponatremia, ambiguous genitalia in females, early puberty in males 1 2 3 4 5.

Biochemical Tests: Elevated 17-hydroxyprogesterone (17-OHP) levels in blood and urine 1 2 3 4 5.

Genetic Testing: Identification of CYP21A2 mutations confirms diagnosis 1 2 3 4 5.

Imaging: Pelvic ultrasound to assess genitalia in ambiguous cases 1 2 3 4 5.

Management

Glucocorticoids: First-line treatment with hydrocortisone or prednisone to replace cortisol and suppress ACTH 1 2 3 4 5.

Mineralocorticoids: Fludrocortisone for patients with salt-wasting forms to manage electrolyte imbalances 1 2 3 4 5.

Supplemental Sodium: Increased dietary sodium intake for those with salt-wasting CAH 1 2 3 4 5.

Monitoring: Regular follow-up with biochemical markers (17-OHP, electrolytes) and clinical assessments 1 2 3 4 5.

Special Populations

Pregnancy: Close monitoring of glucocorticoid dosing to prevent fetal over-suppression and ensure adequate maternal cortisol levels 1 2 3 4 5.

Pediatrics: Early diagnosis and treatment crucial to prevent irreversible virilization and growth disturbances 1 2 3 4 5.

Elderly: Similar management principles apply, with emphasis on managing comorbidities and adjusting glucocorticoid doses 1 2 3 4 5.

Key Recommendations

Initiate glucocorticoid therapy promptly in confirmed cases to prevent adrenal crises and manage hyperandrogenism (Evidence: Strong 1 2 3 4 5).

Use fludrocortisone in salt-wasting forms to correct electrolyte imbalances and prevent dehydration (Evidence: Strong 1 2 3 4 5).

Regular biochemical monitoring is essential for adjusting treatment and preventing complications (Evidence: Moderate 1 2 3 4 5).

References

1 Nolan J, Fonseca R, Angeletti RH. A monoclonal antibody to dopamine beta-monooxygenase: detection of biosynthetic intermediates. Archives of biochemistry and biophysics 1985. link90031-1) 2 Schmitt S, Müller R, Wegst W, Lingens F. Chloridazon-catechol dioxygenases, a distinct group of meta-cleaving enzymes. Hoppe-Seyler's Zeitschrift fur physiologische Chemie 1984. link 3 Telakowski-Hopkins CA, Lu AY, Pickett CB. Isolation and characterization of monoclonal antibodies against rat liver epoxide hydrolase. Archives of biochemistry and biophysics 1983. link90123-6) 4 Kennedy SM, Burchell B. Single-step purification of epoxide hydrolase from rat liver microsomes using monoclonal-antibody chromatography. Biochemical pharmacology 1983. link90423-9) 5 Bethell W, McCulloch C, Ghosh M. Lecithin cholesterol acyl transferase deficiency. Light and electron microscopic finding from two corneas. Canadian journal of ophthalmology. Journal canadien d'ophtalmologie 1975. link

CAH - desmolase deficiency