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Monogenic Forms of Hypertension Eur J Pediatr (2012) 171:1433–1439 DOI 10.1007/s00431-011-1440-7 REVIEW Monogenic forms of hypertension Giacomo Domenico Simonetti & Markus G. Mohaupt & Mario G. Bianchetti Received: 29 December 2010 /Accepted: 24 February 2011 /Published online: 15 March 2011 # Springer-Verlag 2011 Abstract Arterial hypertension in childhood is less fre- adrenal steroid hormone synthesis and deactivation (e.g., quent as compared to adulthood but is more likely to be subtypes of congenital adrenal hyperplasia, apparent min- secondary to an underlying disorder. After ruling out more eralocorticoid excess (AME)). The third mechanism is obvious causes, some patients still present with strongly characterized by excessive aldosterone synthesis that suspected secondary hypertension of yet unknown etiology. escapes normal regulatory mechanisms and leading to A number of these children have hypertension due to single volume-dependent hypertension in the presence of sup- gene mutations inherited in an autosomal dominant or pressed renin release (glucocorticoid remediable aldoste- recessive fashion. The finding of abnormal potassium levels ronism). Hormonal studies coupled with genetic testing can (low or high) in the presence of suppressed renin secretion, help in the early diagnosis of these disorders. and metabolic alkalosis or acidosis should prompt consid- eration of these familial diseases. However, mild hyperten- Keywords Aldosterone . Arterial hypertension . sion and the absence of electrolyte abnormalities do not Childhood . Children . Genetics . Renin . Steroid profile . exclude hereditary conditions. In monogenic hypertensive Mineralocorticoid-like activity disorders, three distinct mechanisms leading to the common final pathway of increased sodium reabsorption, volume expansion, and low plasma renin activity are documented. Introduction The first mechanism relates to gain-of-function mutations with a subsequent hyperactivity of renal sodium and Arterial hypertension in childhood is less frequent as chloride reabsorption leading to plasma volume expansion compared to adulthood but is more likely to be secondary (e.g., Liddle's syndrome, Gordon's syndrome). The second to an underlying disorder. Essential hypertension is rarely mechanism involves deficiencies of enzymes that regulate diagnosed in children less than 5 years of age and only more often beyond the age of 10 years. Obviously, it is of paramount importance to identify secondary origins of G. D. Simonetti (*) persistent hypertension (blood pressure >95th percentile for ’ Division of Pediatric Nephrology, Children s Hospital, height and gender) in these children [14]. Treatment of University of Bern, 3010 Berne, Switzerland hypertension without a specified workup such as often seen e-mail: [email protected] in the adult setting is not justified. The assessment of a hypertensive child should begin M. G. Mohaupt with a careful personal and family medical history and a Department of Nephrology and Hypertension, Inselspital, University of Bern, physical examination. If not diagnostic, investigations Bern, Switzerland should focus on renal or cardiac causes. Appropriate investigations include: full blood cell count, electrolytes M. G. Bianchetti with emphasis on potassium, acid–base balance, uric acid Department of Pediatrics, Ospedale Regionale Bellinzona and University of Bern, and creatinine, urinalysis, and the measurement of the ratio Bern, Switzerland of urinary protein to creatinine in an early morning urine 1434 Eur J Pediatr (2012) 171:1433–1439 sample [10]. The trans-tubular potassium gradient, an Table 1 Some characteristic physical examination findings in estimate of aldosterone bioactivity, is useful with respect childhood hypertension, which might suggest the existence of an underlying monogenic disease to diseases with extracellular fluid volume expansion secondary to increased mineralocorticoid activity. Renin Finding Possible underlying monogenic and aldosterone should be measured and normal values in disease children are available [11]. Renal imaging by ultrasound Café-au-lait-spots, axillary or Neurofibromatosis type 1 and Doppler of renal arteries is essential. Further imaging groin freckling, Lisch's nodules techniques such as NMR, angiography, or renal scan are (=iris hamartomas) performed if appropriate. Echocardiography has a place in Hypomelanotic macules, facial Tuberous sclerosis complex the workup in every child with severe hypertension in order angiofibroma, shagreen patch (Bourneville's disease) a to assess left ventricular mass and to rule out aortic Short metacarpal bones (length of Autosomal-dominant phalanges often normal), short hypertension with coarctation [10]. (or low normal) stature brachydactyly (Bilginturan's Having excluded the more obvious causes, there are still disease) patients in whom secondary hypertension is strongly Palpable kidneys Polycystic kidney disease suspected while the standard search for an etiology is Girl with webbed neck, widely Turner's syndrome unsuccessful. A number of these children will have spaced nipples, short 4th hypertension due to single gene mutation inherited in an metacarpal bone, short stature, swollen hands and feet (neonatal autosomal dominant or recessive fashion. These familial age) disorders are common enough to be included in the Icteric liver disease, heart murmur Alagille's arteriohepatic dysplasia differential diagnosis of any hypertensive child irrespective (pulmonary stenosis), ocular of the severity. The purpose of this review is to discuss the abnormalities (embryotoxon), short stature, facial dysmorphy monogenic forms of low-renin hypertension, which may Upturned nose, depressed nasal Williams–Beuren's syndrome become manifest in childhood. Of particular importance, bridge, periorbital fullness, we will point out when and how should the pediatrician broad mouth, and full lips search for these diseases and discuss the appropriate (=elfin face), short stature, cardiac murmur antihypertensive strategies. Further causes of monogenic Episodic headache or pallor, Pheochromocytoma or hypertension will only shortly be addressed (Table 1). sweating, tachycardia paragangliomab Ambiguous genitalia, virilization Congenital adrenal hyperplasia (11β-hydroxylase deficiency or α When to consider a monogenic form of hypertension 17 -hydroxylase deficiency) Muscles weakness Hereditary diseases that cause hypertension and hypokalemia The inheritance pattern of a given family may already (low-renin hypertension) indicate the presence of a monogenic form of hypertension. A family history of severe hypertension, especially with a Especially 4th and 5th metacarpal bones early onset (adolescence or young adult age) is suggestive b In childhood pheochromocytoma and paraganglioma often occur in of one of the dominantly inherited conditions, whereas the context of a genetic disorder (multiple endocrine neoplasia type 2A or 2B, von Hippel–Lindau disease, neurofibromatosis type 1, consanguinity may indicate recessive inheritance. Never- succinate dehydrogenase mutations) theless, family history is often misleading as essential hypertension is highly prevalent in adults. Consideration of hereditary forms of hypertension should not be limited to system (low plasma renin level or reduced plasma renin children with severe hypertension or electrolyte abnormal- activity) due to an autonomous plasma volume expansion. ities, since mild hypertension and the absence of electrolyte In addition to hyporeninemia, expansion of the extracellular abnormalities does not exclude an inherited condition; in fluid volume can be associated with hypouricemia (by fact, many individuals with these forms of inherited reducing its proximal tubular reabsorption). In synopsis hypertension have only mild to moderate hypertension with the suppressed renin, the level of aldosterone without electrolyte disturbances. Abnormal potassium (increased or suppressed) will further discriminate the levels (low or high), suppressed renin, and metabolic different diseases (Table 2). alkalosis or acidosis should rise suspicion for the presence of these familial disorders. Plasma renin activity or renin concentration (random) and plasma aldosterone levels are Physiology of Na transport in the distal nephron useful at the beginning (prior to therapy) to identify the etiology of the hypertension. All hereditary forms of The consequence of a defective gene in each case of these hypertension lead to a suppression of the renin–angiotensin forms of hypertension is abnormally increased sodium (Na) Eur J Pediatr (2012) 171:1433–1439 1435 Table 2 Findings in inherited forms of hypertension Inheritance Age K Renin Aldo Aldo/ Diagnostic indicators Therapy pattern Renin AME AR I,C,A ↓ (N) ↓↓ Urinary cortisol metabolites ↑, Urinary cortisone metabolites ↓ Spironolactone Eplerenone Hypertension ameliorates with mineralocorticoid receptor Amiloride antagonists (Thiazide if hypercalciuria) GRA AD I,C ↓ or ↓↑(N) ↑ Urinary 18-oxotetrahydrocortisol and Glucocorticoids ↑ N 18-hydroxycortisol/tetrahydroaldosterone ratio Amiloride Hypertension ameliorates with glucocorticoids Triamterene and mineralocorticoid receptor antagonists CAH AR I ↓ or ↓↓ Ambiguous genitalia/amenorrhea, virilization/precocious puberty Spironolactone N Hypertension ameliorates with mineralocorticoid receptor Eplerenone antagonists Liddle AD C,A ↓ or ↓↓ Family history Amiloride N Hypertension does not ameliorate with mineralocorticoid receptor Triamterene antagonists Gordon AD A, ↑ or ↓↑or (↑) Family history
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