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Endocrine Review

Glucose Regulation

• Definition:
  • Glucose regulation is the process of maintaining optimal blood glucose levels.
  • It is a physiological process that ensures glucose balance in the body.
• Key Hormones:
  • Insulin: Hormone primarily tasked with lowering blood glucose levels.
  • Counterregulatory Hormones: Include glucagon and cortisol, which raise blood glucose levels.
• Problems in Regulation:
  • Issues can arise when there are hormone deficits or excesses, or when hormone production fails to meet the body’s blood glucose needs.

Glucose Regulation: Hyperglycemia

Short-Term Consequences:

• Inadequate glucose reaching the cells can particularly harm the neurological system.
• Dehydration caused by increased urination (polyuria).
• Diabetic Ketoacidosis (DKA): a serious complication of hyperglycemia.

Long-Term Consequences:

• End-Organ Disease: Results from microvascular damage, leading to:
  • Retinopathy: Damage to the retina, potentially leading to blindness.
  • Nephropathy: Kidney damage affecting kidney function.
  • Peripheral Neuropathy: Nerve damage that can lead to numbness and pain in the extremities.
• Macrovascular Angiopathy: Involves complications such as:
  • Hypertension (high blood pressure).
  • Cardiovascular disease, including both coronary artery disease (CAD) and peripheral vascular disease.

Glucose Regulation: Hypoglycemia

Consequences:

• Symptoms and consequences of hypoglycemia include:
  • Irritability, fatigue, and mental confusion.
  • Severe cases can lead to seizures and unconsciousness.

Risk Factors for Alterations in Glucose Regulation

Type I Diabetes:

• Family history: Increased risk if a parent, sibling, or child has Type I Diabetes.
• Age: More likely to develop during childhood, adolescence, or young adulthood.

Prediabetes and Type II Diabetes:

• Additional risk factors include:
  • Overweight or obese individuals.
  • Individuals aged 45 years or older.
  • Family history of Type II diabetes.
  • Physical activity less than three times a week.
  • History of gestational diabetes or giving birth to a baby weighing more than 9 pounds.
  • Ethnic background: Higher risk in African Americans, Hispanic/Latino Americans, American Indians, and Alaska Natives. Some Pacific Islanders and Asian Americans also exhibit increased risk.

Glucose Regulation: Assessment

• Blood Glucose (BG) Levels and Categories:
  • Hypoglycemia: BG < 70 mg/dL (severe < 50 mg/dL)
  • Euglycemia: Normal BG range is between 70-140 mg/dL (pre- and post-prandial)
  • Hyperglycemia: Post-prandial BG > 140 mg/dL (severe > 180 mg/dL)

Signs and Symptoms of Glucose Regulation Issues:

• Hypoglycemia:
  • Reduced cognition, tremors, diaphoresis (sweating), weakness, hunger, headache, irritability, and seizures.
• Hyperglycemia:
  • Symptoms include polyuria, polydipsia (increased thirst), dehydration, fatigue, fruity odor to breath (due to ketone production), Kussmaul breathing (deep labored breathing), weight loss, increased hunger, and poor wound healing.

Glucose Regulation: Common Diagnostic Testing

• Direct Measurements:
  • Glucose screening.
  • Hemoglobin A1C (indicates long-term glucose control).
• Other Measurements:
  • Lipid analysis, microalbuminuria, and C-reactive protein levels.

Diabetes Mellitus (DM)

General Information:

• Definition: An error in glucose metabolism; glucose is the body’s primary fuel source.
• Types of Diabetes:
  • DM1 (Type 1 Diabetes): Caused by a lack of insulin.
  • DM2 (Type 2 Diabetes): Characterized by insulin resistance.

Symptoms of Diabetes Mellitus:

• Classic symptoms include polyuria, polydipsia, and polyphagia (increased hunger) along with fluid volume deficit.

Type 1 Diabetes Mellitus (DM1):

• Characteristics:
  • Insulin-dependent, juvenile onset, ketosis prone.
• Consequences of Untreated DM1:
  • If untreated, the disease can lead to death.
• Treatment:
  • Diet: Focus on carbohydrate quantity (less important).
  • Insulin: The most important treatment component.
  • Exercise: Necessary for management.

Clinical Signs/Symptoms of DM1:

• Include unexplained weight loss despite high food intake, ketonuria (presence of ketones in urine), polyuria, polydipsia, polyphagia, blurred vision, fruity breath odor, and ketones in urine.
• Concerns:
  • Risks for complications include microvascular retinopathy, nephropathy, macrovascular atherosclerosis, coronary artery disease (CAD), and myocardial infarction (MI).

Type 2 Diabetes Mellitus (DM2):

• Characteristics:
  • Non-insulin dependent, adult onset, non-ketosis prone.
• Treatment Plan:
  • Often perceived as a death sentence by patients, but it is manageable.
  • Diet: Considered the most important aspect of treatment.
  • Oral Hypoglycemics: Medications used to lower blood sugar.
  • Activity: Physical activity as part of lifestyle changes.

Clinical Signs/Symptoms of DM2:

• Often asymptomatic; diagnosis is typically made during routine screening.
• Possible signs include acanthosis nigricans (a skin manifestation associated with insulin resistance), typically found in the groin folds, over knuckles, and elbows. This condition may regress with weight loss and increased physical activity.
• Concerns: Increased risk due to diabetes itself, particularly in training.

Glucose Regulation: Screening and Laboratory Testing

• Lab Testing:
  • Hemoglobin A1C, with an ideal value < 5.7.
  • Cholesterol levels, with an ideal target of < 200.
  • Microalbuminuria: levels should be < 30.
• Interventions:
  • Focus on education about glucose regulation.
  • Nutrition therapy to ensure balanced meals.
  • Pattern management: Monitoring blood glucose values related to meal timings.
  • Pharmacological agents: Use of oral hypoglycemics including insulin.

NCLEX Questions Example

• What is the best dietary action a DM2 patient should take?
  • A. Restrict Calories
  • B. Divide meals into 6 feedings a day

Diabetes Insipidus (DI)

• Definition: Not a type of diabetes mellitus; it refers to diabetes without the glucose element.
• Symptoms: Polyuria and polydipsia leading to dehydration as a result of low ADH (antidiuretic hormone) levels.
• Clinical Presentation: Includes hypo-osmolality of urine, fatigue, muscle pain, weakness, headache, tachycardia, postural hypotension, and fluid volume deficit.

Interventions for Diabetes Insipidus:

• Monitor patients’ vital signs, neurological status, and cardiovascular status.
• Check electrolyte levels and signs of dehydration.
• Monitor intake and output, patient’s weight, and specific gravity of urine.
• Educate patients on diet and avoidance of diuresis-inducing foods, and on proper medication administration.