# A nurse is assessing a 2-week-old infant with suspected congenital adrenal hyperplasia (CAH). Which assessment finding would be most indicative of this condition?

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## 문제

A nurse is assessing a 2-week-old infant with suspected congenital adrenal hyperplasia (CAH). Which assessment finding would be most indicative of this condition?

## 보기

1. Excessive weight gain with generalized edema
2. Ambiguous genitalia with salt-wasting symptoms **✔ 정답**
3. Cyanosis with severe respiratory distress
4. Jaundice with significant hepatomegaly

**정답: 2**

## 해설

Congenital adrenal hyperplasia (CAH) most commonly presents with ambiguous genitalia in females and salt-wasting symptoms due to cortisol and aldosterone deficiency. Other options represent findings not typical for CAH.

## 심화 해설

Correct Answer: 2. Ambiguous genitalia with salt-wasting symptoms

This finding represents the classic, severe presentation of congenital adrenal hyperplasia (CAH) and is the most indicative combination for a nurse assessing a 2-week-old infant.

Pathophysiology and Clinical Manifestations

CAH encompasses a group of autosomal recessive disorders characterized by a deficiency in one of the enzymes required for cortisol synthesis in the adrenal cortex. The most common form, accounting for over 95% of cases, is 21-hydroxylase deficiency [4]. This enzymatic block prevents the conversion of 17-hydroxyprogesterone to 11-deoxycortisol, leading to two critical consequences:

1.  Cortisol and Aldosterone Deficiency: Impaired production of cortisol and, in the salt-wasting form, aldosterone. Aldosterone deficiency results in the inability to conserve sodium and excrete potassium, leading to hyponatremia, hyperkalemia, and metabolic acidosis [2,3]. This manifests clinically as a salt-wasting crisis with poor feeding, vomiting, lethargy, severe dehydration, and potential hemodynamic collapse [3,4].

2.  Androgen Excess: The precursor steroids accumulate and are shunted into the androgen synthesis pathway, leading to hyperandrogenism. In a 46,XX infant, this in-utero exposure to excess androgens results in the virilization of external genitalia, presenting as ambiguous genitalia [2]. A physical examination may reveal clitoromegaly and fusion of the labioscrotal folds [2].

The combination of these two pathophysiological processes—ambiguous genitalia from prenatal androgen exposure and a postnatal salt-wasting crisis from mineralocorticoid deficiency—is the hallmark of classic, salt-wasting CAH in a female infant [2,3].

Analysis of Incorrect Options

-   Option 1: Excessive weight gain with generalized edema: This finding is inconsistent with the salt-wasting form of CAH. Salt-wasting leads to volume depletion and weight loss due to severe dehydration, not fluid overload [4]. Edema is not a typical feature.

-   Option 3: Cyanosis with severe respiratory distress: While an adrenal crisis can progress to cardiovascular collapse and shock, cyanosis and respiratory distress are not the most specific or initial defining characteristics of CAH. These are late signs of decompensation and are more indicative of primary cardiac or respiratory pathologies. The initial presentation is more commonly gastrointestinal symptoms and lethargy [3].

-   Option 4: Jaundice with significant hepatomegaly: This presentation is not characteristic of CAH. Jaundice and hepatomegaly in a 2-week-old infant are more suggestive of other conditions such as biliary atresia, neonatal hepatitis, or metabolic liver diseases. The case reports do not associate these findings with the primary pathology of CAH [1,2,3,4].

NCLEX-RN Clinical Reasoning

For the NCLEX-RN, recognizing the "ambiguous genitalia plus salt-wasting" pattern is critical. This presentation is a time-sensitive emergency. The nurse's priority is to identify these assessment cues to facilitate prompt diagnosis and intervention. A delay can lead to a life-threatening adrenal crisis with hyperkalemia, hyponatremia, and shock, as highlighted in a case where an infant presented with sudden cardiac arrest . The assessment of an infant with suspected CAH must include careful inspection of the genitalia and vigilant monitoring of fluid and electrolyte status, specifically looking for signs of dehydration and obtaining laboratory values for serum electrolytes and glucose [2,3].References (research sources)

- [2]Neonatal presentation of congenital adrenal hyperplasia accompanied by isolated cleft palate: case report.Case reportSaka SA. (2025) · DOI: 10.1093/omcr/omaf188

- [3]Unveiling Salt-Wasting Congenital Adrenal Hyperplasia in an Infant: A Diagnostic Challenge.Research articleKummari S, Krishna Sravya M, R M. (2026) · DOI: 10.7759/cureus.103140

- [4]A Neonate Presenting with Severe Dehydration: A Rare Case of Congenital Adrenal Hyperplasia with Salt Losing Crisis.Research articleLamichhane A, Phuyel R, Upreti M, Khadka R. (2024) · DOI: 10.31729/jnma.8777

## 임상 시나리오

Clinical Assessment Guide for Suspected CAH in Newborns

When assessing a 2-week-old infant for congenital adrenal hyperplasia, focus on the two hallmark manifestations of the classic salt-wasting form. Early recognition is critical to prevent life-threatening adrenal crisis.

- **Genital Examination:** Inspect for ambiguous genitalia in phenotypic females (clitoromegaly, labioscrotal fusion). In males, the genitalia may appear normal or show subtle hyperpigmentation, making the salt-wasting signs the primary diagnostic clue.

- **Salt-Wasting Signs:** Monitor for poor feeding, vomiting, lethargy, and rapid weight loss. These reflect the hyponatremia, hyperkalemia, and severe dehydration caused by aldosterone deficiency. Progression can lead to hypovolemic shock and cardiac arrhythmias.

- **Vital Signs and Perfusion:** Assess for tachycardia, hypotension, and delayed capillary refill as indicators of impending hemodynamic collapse. These findings require immediate intervention.

- **Differential Alert:** Do not confuse salt-wasting dehydration with conditions causing edema or jaundice. The absence of cortisol and aldosterone leads to fluid loss, not retention, and the metabolic crisis is distinct from hepatic or pulmonary pathologies.

**Nursing Priority:** Any infant with ambiguous genitalia and signs of dehydration or electrolyte imbalance should be evaluated for CAH immediately. Obtain serum electrolytes, glucose, and 17-hydroxyprogesterone levels, and prepare for glucocorticoid and mineralocorticoid replacement therapy.

## 핵심 개념

- **Congenital Adrenal Hyperplasia (CAH)** — A group of autosomal recessive disorders caused by enzyme deficiencies in cortisol synthesis, most commonly 21-hydroxylase deficiency, leading to cortisol/aldosterone deficiency and androgen excess.
- **Salt-Wasting Crisis** — A life-threatening complication of CAH characterized by hyponatremia, hyperkalemia, metabolic acidosis, and severe dehydration due to aldosterone deficiency.
- **Ambiguous Genitalia** — Atypical external genitalia appearance making sex assignment difficult, caused in female CAH infants by in-utero exposure to excess androgens.
- **21-Hydroxylase Deficiency** — The most common enzymatic defect in CAH, impairing conversion of 17-hydroxyprogesterone to 11-deoxycortisol, resulting in deficient cortisol and aldosterone with shunting to androgen production.
- **Hyperandrogenism** — Excess production of androgens due to precursor accumulation in CAH, causing virilization of external genitalia in affected female infants.

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