Metabolic Syndrome in Adolescents with Hypertension

Definition and Core Components

Metabolic syndrome is a clustering of interconnected cardiovascular risk factors including obesity, insulin resistance, hypertension, dyslipidemia, and glucose intolerance that collectively increase risk for atherosclerotic cardiovascular disease and type 2 diabetes mellitus, as defined by the American Heart Association 1, 2
The syndrome represents more than just the sum of individual risk factors—these components synergistically amplify cardiovascular risk beyond what would be expected from each factor alone, according to the American College of Cardiology 3 is not used, instead: the components synergistically amplify cardiovascular risk beyond what would be expected from each factor alone 3

When evaluating an adolescent with hypertension for metabolic syndrome, systematically screen for these cardiometabolic risk factors, including central obesity, which can be measured by waist circumference at the level of the iliac crest, with a cutoff of ≥90th percentile for age and sex indicating central obesity, as recommended by the American Academy of Pediatrics 4
Dyslipidemia, characterized by high triglycerides (≥110 mg/dL) and low HDL cholesterol (below age- and sex-specific norms), is a key component of metabolic syndrome, according to the National Heart, Lung, and Blood Institute 6, 8
Insulin resistance and glucose abnormalities, including impaired fasting glucose (100-125 mg/dL) and impaired glucose tolerance, should be assessed, as recommended by the American Diabetes Association 4, 6
Blood pressure, already present in the patient, is a critical component of metabolic syndrome, and fasting insulin correlates significantly with blood pressure in children and adolescents, predicting future blood pressure elevation, as noted by the American Heart Association 5, 6

Refer to a pediatric endocrinologist when there is evidence of glucose intolerance or prediabetes, including impaired fasting glucose (100-125 mg/dL) and impaired glucose tolerance, as recommended by the American Academy of Pediatrics 4, 6
Severe obesity with multiple metabolic abnormalities, including BMI ≥95th percentile with ≥2 additional metabolic risk factors, warrants referral to a pediatric endocrinologist, according to the American Heart Association 4, 8
Suspected type 2 diabetes mellitus, characterized by fasting glucose ≥126 mg/dL, random glucose ≥200 mg/dL with symptoms, and HbA1c ≥6.5%, requires prompt referral to a pediatric endocrinologist, as recommended by the American Diabetes Association 5, 8
Severe dyslipidemia, including triglycerides persistently >200 mg/dL and HDL cholesterol <35 mg/dL, may require specialized management by a pediatric endocrinologist, according to the National Heart, Lung, and Blood Institute 6, 8
Complex cases requiring comprehensive metabolic evaluation, including multiple risk factors not responding to initial lifestyle interventions, may benefit from referral to a pediatric endocrinologist, as recommended by the American Academy of Pediatrics 1, 2, 10