Salt and Blood pressure problem in newborns: Let’s understand CAH !

CAH stands for Congenital Adrenal Hyperplasia. It is an inherited genetic condition and the second most common endocrine disorder detected through universal newborn screening. In India, CAH is a leading clinical concern, accounting for approximately 38% of all cases of ambiguous genitalia identified in newborns.

CAH is caused by a genetic defect in the enzymes required to synthesize essential steroid hormones in the adrenal glands (most commonly a deficiency in 21-hydroxylase). This enzyme blockage leads to three major metabolic imbalances:

• Cortisol Deficiency: Cortisol is essential for regulating energy, vascular tone, and stress responses during illness.
• Aldosterone Deficiency (Salt-Wasting): Without aldosterone, the kidneys cannot hold onto sodium, leading to severe dehydration, low blood pressure, and elevated potassium.
• Excess Androgens: The precursor hormones get diverted into excess male sex hormones, causing physical changes in newborn girls and rapid early maturation in boys.

The most common acute presentation in newborns is abnormal blood pressure along with electrolyte imbalances (low Sodium and high Potassium). Symptoms often include:

The most severe “salt-wasting” forms can appear as early as 2 weeks after birth in a baby who seemed entirely fine initially. The infant can suddenly develop vomiting, poor feeding, loose stools, and become critically sick and dehydrated very fast. This is a medical emergency termed an adrenal crisis and requires immediate hospital intervention.

Yes. Female newborns exposed to excess androgens in utero may have physical genital changes recognizable immediately at birth:

• Enlarged Clitoris: May look male-like or resembling a small penis (virilization).
• Dark Hyperpigmentation: Increased skin pigmentation, particularly over the genital area and areolae due to elevated ACTH.
• Abnormalities of Labia Majora: Fusion or rugation of the labia resembling a scrotum.

These external genital variations offer a life-saving early clinical clue for timely diagnosis before severe salt-wasting begins.

Diagnosis involves standardized clinical and biochemical protocols:

Once CAH is diagnosed, treatment begins immediately and continues lifelong. It centers on restoring hormone balance:

These are oral medications administered daily. The exact dosage is continually tailored by your Pediatric Endocrinologist to balance optimal linear growth without overtreatment.

Yes, absolutely! Once treatment is started and hormone levels are stabilized, children with CAH lead normal, active, and fulfilling lives. They attend regular school, participate in athletic activities, achieve healthy adult height, and can have biological children of their own as adults.

Ongoing monitoring by your Pediatric Endocrinologist ensures continuous growth assessment, regular electrolyte balance checks, and peace of mind for parents.