Blood Pressure in Children with Congenital Adrenal Hyperplasia due to 21-Hydroxylase Deficiency.

BACKGROUND

Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency (21OHD) leads to impaired glucocorticoid and mineralocorticoid synthesis with excess production of androgens. Replication of the normal circadian cortisol secretion is challenging and supraphysiological doses of glucocorticoids are often required. Most patients experience transient episodes of hyper- and hypocortisolaemia during the day leading to adverse metabolic outcomes such as insulin resistance, visceral adiposity, and cardiovascular morbidity, including hypertension. These health problems are commonly diagnosed in adolescence and adulthood.

SUMMARY

Herein, we review the published data on the variation in blood pressure in CAH due to 21OHD and the interrelation with disease and treatment factors.

KEY MESSAGES

Hypertension in childhood is a well-known risk factor for poor cardiovascular health in later life. Children with CAH have a higher prevalence of hypertension, which is more commonly transient. The prevalence is higher at younger ages, while relatively fewer patients remain hypertensive in adolescence, requiring antihypertensive treatment. Most studies suggest, transient hypertension in early childhood is associated with mineralocorticoid replacement; however, its direct association with adverse cardiovascular and metabolic outcome is not well established. There is insufficient evidence to support a relationship between hypertension and either glucocorticoid dose or salt supplementation in infancy. Androgen excess has been suggested as a possible reason for the absence of gender dimorphism in the incidence of hypertension and cardiovascular risks in CAH. There is no conclusive evidence for a direct association between hypertension and hyperandrogenism or insulin resistance. Increased carotid intima media thickness is commonly found in children with CAH and is thought to be driven by increased blood pressure.