critical endo

Pathophysiology: DKA and HHS

DKA (Diabetic Ketoacidosis)

  • Mechanism involves:

    • Activation of hormone-sensitive lipase.

    • Increased counter-regulatory hormones including cortisol, glucagon, growth hormone, catecholamines.

    • Leads to hyperglycemia via increased glycogenolysis and gluconeogenesis.

  • Results in metabolic acidosis and formation of ketone bodies due to elevated free fatty acids (FFAs).

HHS (Hyperglycemic Hyperosmolar State)

  • Mechanism characterized by:

    • Insulin resistance and pronounced osmotic diuresis.

    • Elevated serum osmolality leading to dehydration and increased pro-inflammatory cytokines.

DKA and HHS: Risk Factors

  • Both conditions arise from physical stress like:

    • Injury, illness, infection, surgery

    • Alcohol abuse

    • New onset diabetes and elevated HbA1C

    • Noncompliance with insulin therapy

    • Medication impacts: corticosteroids, antipsychotics, antidepressants

Specific Risk Factors

  • DKA:

    • Typical ages 13 to 25, more prevalent in females, previous bouts of DKA.

  • HHS:

    • Occurs primarily in those over 65, notably among African American, Native American, Hispanic populations, and those with morbid obesity.

DKA and HHS: Impact on Overall Health

  • DKA:

    • Results in metabolic acidosis, muscle weakness, dehydration, electrolyte loss, cardiac arrhythmias, Kussmaul respirations (deep labored breathing), reduced kidney perfusion.

  • HHS:

    • Characterized by severe neurological implications, profound dehydration, risk for thromboembolic events, and similar cardiac and renal challenges as seen in DKA.

DKA and HHS: Clinical Presentation

  • General symptoms include:

    • Decreased consciousness, nausea, vomiting, abdominal pain, fruity breath (specific to DKA), hyperventilation, hypotension, arrhythmias, blurred vision, polydipsia, weight loss.

DKA and HHS: Lab and Diagnostic Studies

  • Key laboratory values include:

    • Serum blood glucose levels: DKA > 250 mg/dL; HHS > 600 mg/dL.

    • Complete blood count (CBC): monitor white blood cell count (WBC).

    • Electrolytes assessment: potassium (K), magnesium (Mg), sodium (Na), chloride (Cl), phosphorus (Phos).

    • Arterial Blood Gases (ABGs): DKA clients will exhibit metabolic acidosis (pH < 7.3 and HCO3 < 15).

    • Anion gap: DKA > 10 mEq/L indicating acidosis; HHS typically within normal range.

    • Serum osmolality: HHS > 320 mOsm/kg.

    • Urine studies: assess for glucose and ketones; in DKA, both are typically present, with osmolality above expected range.

    • Additional diagnostic tools include chest X-rays and ECGs for dysrhythmia assessment.

DKA and HHS: Treatments and Therapies

General Treatment Goals

  • RESTORE circulatory volume.

    • Secure large bore IV access or central line.

    • Replace half of fluid deficit within the first 12-24 hours via IV isotonic fluid.

    • Monitor sodium levels, transitioning to hypotonic solutions when appropriate.

Hyperglycemia Management

  • Avoid rapid decline in blood glucose.

  • Administration includes:

    • Initial bolus of IV regular insulin based on weight (0.1 units/kg).

    • Continuous IV insulin infusion aimed at reducing blood glucose by 50-70 mg/dL/hour, with adjustments as needed.

    • Once blood glucose is consistently < 200 mg/dL (DKA) or < 300 mg/dL (HHS), decrease IV insulin infusion rate.

Electrolyte Management

  • Specific Goals for electrolytes:

    • Maintain potassium at 4.0 to 5.0 mEq/L.

    • Use IV fluids to correct sodium and supplement magnesium as necessary.