MedGen

Autosomal recessive pseudohypoaldosteronism type IB3 (PHA1B3) is characterized by renal salt wasting and high concentrations of sodium in sweat, stool, and saliva. The disorder involves multiple organ systems and is especially threatening in the neonatal period. Laboratory evaluation shows hyponatremia, hyperkalemia, and increased plasma renin activity with high serum aldosterone concentrations. Respiratory tract infections are common in affected children and may be mistaken for cystic fibrosis (CF; 219700). Aggressive salt replacement and control of hyperkalemia results in survival, and the disorder appears to become less severe with age (review by Scheinman et al., 1999). [from OMIM]

Liddle syndrome is an autosomal dominant form of hypertension characterized by early onset of hypertension associated with hypokalemia, suppressed plasma renin activity, and suppressed secretion of the mineralocorticoid hormone aldosterone (summary by Hansson et al., 1995). For a general phenotypic description and a discussion of genetic heterogeneity of Liddle syndrome, see 177200. [from OMIM]

Bronchiectasis with or without elevated sweat chloride-3 (BESC3) is characterized by dilation of the airways arising from chronic bronchial inflammation accompanied by chronic cough, purulent sputum, and recurrent lower respiratory tract infections. Most patients show some degree of airflow obstruction (Fajac et al., 2008). [from OMIM]