Type 2 diabetes and metabolic syndrome in youth — branching viva

Station opening

Examiner: "Tell me the single bedside concept that frames every overweight adolescent with acanthosis nigricans, and why it matters." [7]

Strong candidate (must-hit)

• The concept is insulin resistance with progressive beta-cell decline, layered on obesity and the metabolic cluster. Resist insulin and the beta cell drives out more of it, producing the acanthosis, ovarian hyperandrogenism, fatty liver, dyslipidaemia and hypertension that travel together. Exhaust the beta cell and glucose rises. It matters because the disease is faster and more aggressive than adult type 2 diabetes — beta-cell function is already halved at diagnosis and declines about 15 to 20 percent per year — so the acanthosis is a call to assess, not a cosmetic aside. [7] [1]

Weak candidate

• "It is probably just a skin problem — I would refer to dermatology." [7]

Branch A — The fourteen-year-old with acanthosis and irregular periods

Examiner: "A fourteen-year-old girl has acne, oligomenorrhoea, acanthosis at the neck, a body mass index at the 95th percentile, a mother with type 2 diabetes, a random glucose of 11.8 and an HbA1c of 7.1 percent. What is the diagnosis, how do you confirm the type, and how do you manage it?" [1]

Strong

• Diagnoses type 2 diabetes, confirmed by the random glucose of 11.8 with symptoms and the HbA1c of 7.1 percent meeting the thresholds, and confirms the type with negative islet autoantibodies and a measurable or high C-peptide against the phenotype. Starts structured family-based lifestyle and metformin titrated to 1500 to 2000 milligrams per day, and addresses the polycystic ovary syndrome with the same metformin, lifestyle and hormonal contraception for cycle control. Adds comorbidity care — blood pressure, lipids, fatty liver — because the metabolic cluster drives the long-term risk. [1] [6]

Weak

• "I would start insulin because she has diabetes." [10]

Branch B — The thirteen-year-old whose metformin is failing

Examiner: "A thirteen-year-old on metformin 1000 milligrams twice daily for two years has an HbA1c risen to 8.6 percent, a blood pressure of 134 over 88, and mildly raised albuminuria. Why is it failing, what does TODAY say, and what do you do next?" [10]

Strong

• Explains that beta-cell function in youth declines 15 to 20 percent per year, far faster than in adults, and that TODAY showed roughly half of adolescents fail metformin monotherapy within a few years. Escalates by adding a long-acting basal insulin at 0.25 to 0.5 units per kilogram per day with metformin continued, and considers a GLP-1 receptor agonist or an SGLT2 inhibitor such as empagliflozin, established in DINAMO, as add-on therapy. Treats the blood pressure and albuminuria as early nephropathy with an ACE inhibitor or angiotensin receptor blocker, because the complications of type 2 appear faster than in type 1. [10] [8] [11]

Weak

• "I would increase the metformin dose and review in a year." [10]

Branch C — The fifteen-year-old with an unclear type

Examiner: "A fifteen-year-old with obesity presents with polyuria and a glucose of 22, and has mild ketones. How do you resolve whether this is type 1 or type 2, and why does it matter?" [1]

Strong

• Sends the islet autoantibody panel and a C-peptide with a simultaneous glucose to resolve the type. Obesity, acanthosis, a family history, negative antibodies and a measurable or high C-peptide point to a ketosis-prone type 2 phenotype, while positive antibodies and a low C-peptide point to type 1. It matters because type 2 demands metformin, lifestyle and the metabolic-cluster care alongside any insulin, whereas type 1 demands lifelong insulin and autoimmune comorbidity screening — getting the type wrong traps the adolescent in the wrong regimen for years. [1]

Weak

• "If there are ketones it must be type 1 — I would start insulin and not look further." [1]

Branch D — The metabolic syndrome definition

Examiner: "Define the metabolic syndrome in adolescents and explain the contested element." [6]

Strong

• Gives the IDF consensus: central adiposity with a waist circumference at or above the 90th percentile plus two or more of triglycerides at least 1.7 millimoles per litre, HDL below 1.0 in males or 1.3 in females, blood pressure at least 130 over 85, and fasting glucose at least 5.6. Notes that the definition is contested across the IDF, Cook and NHLBI criteria, which is why some paediatric endocrinologists treat the metabolic syndrome as a flag for cardiovascular risk rather than a rigid disease label. [6]

Weak

• "It is just obesity plus diabetes." [6]

Close

Examiner: "Summarise your approach to suspected type 2 diabetes or metabolic syndrome in youth in one sentence." [1]

Strong

• "I hold insulin resistance with progressive beta-cell decline in mind — look for acanthosis in every overweight adolescent, screen from age ten in those with a risk factor, confirm with the diagnostic thresholds and the antibody and C-peptide profile, treat with the stepwise ladder of lifestyle, metformin, insulin when needed, and newer agents, and control every component of the metabolic cluster because the complications of youth-onset type 2 arrive faster than in type 1." [1] [11]