Primary Adrenal Insufficiency in childhood: data from a large nationwide cohort.

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Primary adrenal insufficiency (PAI) is a rare and potentially life-threatening condition, poorly characterized in describe causes, presentation, auxological outcome, frequency of adrenal crisis and mortality of a large cohort of children with from 803 patients from 8 centers of Pediatric Endocrinology were retrospectively collected.the following etiologies were reported: 85% (n=682) Congenital Adrenal Hyperplasia (CAH) due to 21-hydroxylase deficiency (21-OHD); 3.1% (n=25) X linked Adrenoleukodystrophy; 3.1% (n=25) Autoimmune Polyglandular syndrome type 1; 2.5% (n=20) autoimmune AI; 2% (n=16) Adrenal Hypoplasia Congenital; 1.2% (n=10) CAH non 21-OHD; 1% (n=8) rare syndromes; 0.6% (n=5) Familial Glucocorticoid Deficiency; 0.4% (n=3) acquired AI; 9 patients (1%) did not receive diagnosis. Since 21-OHD CAH has been extensively characterized, it was not further reviewed. In 121 patients with a diagnosis different from 21-OHD CAH, the most frequent symptoms at diagnosis were fatigue (67%), hyperpigmentation (50.4%), dehydration (33%) and hypotension (31%). Elevated ACTH (96.4%) was the most common laboratory finding followed by hyponatremia (55%), hyperkalemia (32.7%) and hypoglycemia (33.7%). The median age at presentation was 6.5±5.1 years (0.1-17.8 years) and the mean length of symptoms before diagnosis was 5.6±11.6 months (0-56 months) depending on etiology. Rate of adrenal crisis was 2.7 per 100 patients years. Three patients died for the underlying disease. Adult height, evaluated in 70 patients, was -0.70±1.20 SDS.we characterized one of the largest cohorts of children with PAI aiming to improve the knowledge on diagnosis of this rare condition.

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