Growth Hormone, Precocious Puberty, Diabetes, and Metabolic Disorders

Growth Hormone Excess and Related Conditions

  • Growth Hormone Excess

    • Characteristic of overproduction of growth hormone before the closure of growth plates.

    • Leads to excessive growth, often resulting in heights reaching approximately eight feet in children.

    • Associated with increased muscle mass relative to height.

  • Acromegaly

    • Condition resulting from prolonged excess growth hormone in adults.

    • Features include:

    • Enlarged jaw (macrognathia).

    • Overgrowth of the head and paranasal areas.

    • Example of an NBA basketball player displaying classic characteristics of acromegaly.

Precocious Puberty

  • Definition and Age Ranges

    • Defined as sexual development occurring before age nine in boys and age eight in girls.

    • Often a result of hormonal imbalance and can sometimes stem from chronic health issues or nutritional deficiencies.

  • Growth Patterns

    • Rapid growth during childhood or adolescence but may plateau, leading to shorter adult stature due to early closure of growth plates.

  • Prevalence and Risk Factors

    • More common in females than males.

    • Requires medical evaluation for girls younger than seven and African American girls younger than six.

  • Tanner Stages of Puberty

    • Stages of physical development during puberty; precocious puberty involves earlier than expected progression through these stages.

  • Treatment

    • Identify and address underlying causes.

    • Medications like Lupron may be used to slow growth until the appropriate age for puberty.

    • Psychological support is crucial for affected children and their families due to contradictory physical and chronological ages.

Delayed Puberty

  • Definition and Expectations

    • Expected onset of puberty by age 14 in girls and 15 in boys.

    • Most common causes of delayed puberty include familial patterns of delayed development.

  • Clinical Considerations

    • Concerns arise if menstruation has not begun by age 17 for girls; estrogen may be administered to initiate cycles.

    • In boys, if testicular growth has not begun by age 15, testosterone supplementation might be explored.

Diabetes Overview

  • Types of Diabetes

    • Type 1 Diabetes:

    • Insulin-dependent; characterized by the failure of insulin production in the pancreas.

    • Type 2 Diabetes:

    • Insulin resistance or insufficient insulin production; increasingly common among children and linked to obesity and metabolic syndrome.

  • Risk Factors

    • Type 1: Increased risk associated with family history; however, 90% of new cases arise without known family history.

    • Type 2: Risk factors include ethnicity, family history, and modifiable factors like obesity and lack of physical activity.

  • Diagnosis

    • Use of A1c testing to measure average blood glucose over three months. Key thresholds include:

    • Prediabetes: A1c of 5.7% to 6.4%.

    • Diabetes: A1c of 6.5% or greater.

  • Signs and Symptoms of Diabetes

    • Symptoms include:

    • Polydipsia: Excessive thirst.

    • Polyuria: Excessive urination.

    • Polyphagia: Excessive hunger.

    • Unexplained weight loss.

  • Diabetic Ketoacidosis (DKA)

    • A serious condition that can occur in both children and adults with diabetes.

    • Symptoms include dehydration, electrolyte imbalances, and possible confusion.

    • Fruity breath odor is a classic sign.

Metabolic Disorders

  • Phenylketonuria (PKU)

    • Autosomal recessive genetic disorder.

    • Characterized by the inability to convert phenylalanine to tyrosine, leading to elevated phenylalanine levels and potential severe cognitive impairment.

    • Diagnosis through newborn screening.

    • Management focuses on dietary restriction of phenylalanine (avoidance of high-protein foods).

    • PKU formula is often used for dietary management.

  • Galactosemia

    • Condition resulting from the accumulation of galactose in the body due to enzyme deficiency.

    • Requires lifelong avoidance of lactose and galactose-containing foods (e.g., milk and dairy products).

    • Management involves using soy-based or elemental formulas.

  • Tay-Sachs Disease

    • Genetic disorder primarily affecting those of Eastern European Jewish descent.

    • Caused by the inability to metabolize lipids, leading to harmful accumulation in nerve cells.

    • Symptoms appear well during infancy, but lead to severe cognitive challenges.

    • Hallmark sign: Cherry-red spot on the macula.

    • No cure; supportive care is emphasized for children affected.

Conclusion

  • Management of Diseases in Children

    • Pediatric management of diabetes and metabolic disorders closely paralleled adult management, but with added considerations for developmental and psychological support.