Endocrine Emergencies: DKA vs HHS, Addisonian Crisis, Thyroid Storm

Endocrine Emergencies: DKA vs HHS, Addisonian Crisis, Thyroid Storm

A practical guide for rapid recognition, diagnosis, and management

What Is This?

Endocrine emergencies are life-threatening conditions caused by hormonal imbalances. This guide covers: - Diabetic Ketoacidosis (DKA) and Hyperosmolar Hyperglycemic State (HHS) – acute complications of diabetes. - Addisonian Crisis – adrenal insufficiency leading to shock. - Thyroid Storm – extreme hyperthyroidism causing multi-organ failure.

Why it matters today: These emergencies kill if missed. Nurses, paramedics, and clinicians must recognize them early, stabilize patients, and prevent complications (e.g., cerebral edema, arrhythmias, or death).

Why It Matters

• DKA/HHS: 1 in 4 diabetes-related hospitalizations. Mortality: DKA (1-5%), HHS (10-20%).
• Addisonian Crisis: 6-8% mortality if untreated; often misdiagnosed as sepsis.
• Thyroid Storm: 10-30% mortality; mimics psychiatric or cardiac emergencies.

Real-world impact: - Missed DKA-cerebral edema (especially in kids). - Delayed HHS treatment-hyperosmolar coma. - Untreated Addisonian crisis-refractory shock. - Thyroid storm-heart failure or arrhythmias.

Core Concepts

1. Pathophysiology: What’s Breaking?

2. Key Differences: DKA vs HHS

3. Red Flags: When to Suspect These Emergencies

• DKA: Fruity breath, Kussmaul respirations, abdominal pain, polyuria.
• HHS: Profound dehydration, altered mental status, focal neurologic deficits.
• Addisonian Crisis: Hypotension despite fluids, hyperkalemia, hyponatremia, hyperpigmentation.
• Thyroid Storm: Fever (>104°F), tachycardia (>140 bpm), agitation, heart failure.

4. Lab Clues: What to Order

How It Works: Step-by-Step Management

1. DKA & HHS: The 4-Phase Approach

Phase 1: Resuscitate (First 30-60 min)

• ABCs: Intubate if GCS <8 or severe acidosis (pH <7.0).
• IV Access: 2 large-bore IVs (18G or larger).
• Fluids:
• DKA: 1L NS bolus, then 250-500 mL/hr (adjust for cardiac/renal disease).
• HHS: 1-2L NS bolus, then 250-500 mL/hr (caution in elderly/CHF).
• Monitor: BP, HR, urine output, glucose q1h, electrolytes q2-4h.

Phase 2: Insulin (After Fluids)

• Bolus? No (increases risk of cerebral edema in kids).
• Drip: 0.1 units/kg/hr regular insulin (e.g., 7 units/hr for 70kg patient).
• Goal: Lower glucose by 50-75 mg/dL/hr. If not dropping, double the rate.
• Switch to D5NS when glucose:
• DKA: <200 mg/dL
• HHS: <300 mg/dL

Phase 3: Electrolytes (Critical!)

• Potassium:
• <3.3 mEq/L: Hold insulin, give 20-40 mEq/hr until >3.3.
• 3.3-5.2 mEq/L: Add 20-30 mEq to each liter of IVF.
• >5.2 mEq/L: Hold K+, recheck q2h.
• Phosphate: Replace if <1 mg/dL (risk of respiratory failure).
• Bicarbonate: Only if pH <6.9 (controversial; may worsen cerebral edema).

Phase 4: Transition to SubQ Insulin

• Criteria to stop IV insulin:
• DKA: pH >7.3, bicarb >18, anion gap <12.
• HHS: Osmolality <315, mental status normal.
• Overlap: Give subQ insulin 1-2 hrs before stopping IV drip.

Special Populations

• Kids: Higher risk of cerebral edema (avoid rapid fluid correction).
• Pregnancy: Aggressive treatment (DKA increases fetal mortality).
• Renal Failure: Adjust fluids/insulin (risk of fluid overload).

2. Addisonian Crisis: The "Salt, Sugar, Steroids" Rule

Step 1: Stabilize (First 15 min)

• Hydrocortisone 100mg IV bolus (or dexamethasone 4mg if cortisol level pending).
• NS bolus 1L (repeat if hypotensive).
• D50 if hypoglycemic (common in adrenal insufficiency).

Step 2: Supportive Care

• Fludrocortisone 0.1mg PO (if hyperkalemic).
• Monitor: BP, glucose, electrolytes q4h.
• Taper steroids over 3-5 days once stable.

Step 3: Find the Trigger

• Common causes: Infection, trauma, surgery, abrupt steroid withdrawal.
• Workup: Cortisol level (low), ACTH stimulation test (if diagnosis unclear).

3. Thyroid Storm: The "Block, Cool, Support" Approach

Step 1: Block Thyroid Hormone (First 30 min)

• PTU 600-1000mg PO/NG (blocks new hormone synthesis + peripheral conversion).
• OR Methimazole 60-80mg PO (if PTU unavailable).
• Iodine (SSKI 5 drops PO q6h) 1 hour after PTU (prevents hormone release).

Step 2: Block Adrenergic Effects

• Beta-blocker: Propranolol 60-80mg PO q4h or esmolol IV (titrate to HR <100).
• Avoid aspirin (displaces thyroid hormone from binding proteins).

Step 3: Cool & Support

• Cooling: Acetaminophen, cooling blankets (avoid shivering).
• Steroids: Hydrocortisone 100mg IV q8h (blocks T4?T3 conversion).
• IVF: NS for dehydration (risk of high-output heart failure).

Step 4: Definitive Treatment

• Radioactive iodine or thyroidectomy once stable.

Hands-On: Minimal Viable Management

Scenario: 25yo with Type 1 DM, vomiting, fruity breath

1. Assess: ABCs, GCS, vitals (HR 120, BP 90/60, RR 28).
2. IV Access: 2 large-bore IVs.
3. Labs: STAT glucose, BMP, VBG, ketones, lactate.
4. Fluids: 1L NS bolus.
5. Insulin: 0.1 units/kg/hr (e.g., 7 units/hr).
6. Potassium: Add 20mEq to IVF if K+ 3.3-5.2.
7. Monitor: Glucose q1h, electrolytes q2h.

Expected outcome: Glucose drops by 50-75 mg/dL/hr, anion gap closes in 12-24 hrs.

Common Pitfalls & Mistakes

1. Overcorrecting glucose too fast in HHS-cerebral edema.
2. Fix: Keep glucose >250 mg/dL until osmolality normalizes.
3. Forgetting potassium in DKA-fatal arrhythmias.
4. Fix: Check K+ before insulin; replace if <5.2.
5. Delaying steroids in Addisonian crisis-refractory shock.
6. Fix: Give hydrocortisone before cortisol results.
7. Using aspirin in thyroid storm-worsens hyperthyroidism.
8. Fix: Use acetaminophen for fever.
9. Stopping IV insulin too early in DKA-rebound acidosis.
10. Fix: Overlap IV and subQ insulin by 1-2 hrs.

Best Practices

• DKA/HHS:
• Use weight-based insulin dosing (0.1 units/kg/hr).
• Avoid bicarbonate unless pH <6.9 (risk of cerebral edema).
• Check glucose q1h until stable.
• Addisonian Crisis:
• Assume it’s adrenal insufficiency if hypotension + hyperkalemia.
• Give steroids before pressors (pressors won’t work without cortisol).
• Thyroid Storm:
• PTU before iodine (prevents hormone release).
• Beta-blockers are lifesaving (control HR and BP).

Tools & Frameworks

Real-World Use Cases

1. ER Triage Nurse:
2. Scenario: 65yo with Type 2 DM, altered mental status, glucose 900.

3. Action: Recognize HHS, start NS bolus, call for insulin drip.

4. ICU Resident:

5. Scenario: 30yo with hypotension, hyperkalemia, hyponatremia post-surgery.

6. Action: Suspect Addisonian crisis, give hydrocortisone + fluids.

7. Paramedic:

8. Scenario: 40yo with fever, tachycardia, agitation, thyroidectomy scar.
9. Action: Recognize thyroid storm, give PTU + propranolol en route.

Check Your Understanding (MCQs)

Question 1

A 19yo with Type 1 DM presents with vomiting, Kussmaul respirations, and glucose 450. VBG shows pH 7.1, bicarb 12. What’s the next best step? A) Give 1 amp D50 B) Start insulin drip at 0.1 units/kg/hr C) Check potassium before insulin D) Give 1L NS bolus

Correct Answer: C Explanation: Potassium must be checked before insulin (insulin drives K+ into cells, risking hypokalemia and arrhythmias). Why the Distractors Are Tempting: - A) D50 is for hypoglycemia (glucose is 450). - B) Insulin is correct, but timing matters (check K+ first). - D) Fluids are important, but potassium is critical in DKA.

Question 2

A 70yo with Type 2 DM is found confused. Glucose 1200, Na+ 155, osmolality 350. No ketones. What’s the most likely diagnosis? A) DKA B) HHS C) Addisonian crisis D) Thyroid storm

Correct Answer: B Explanation: HHS is characterized by severe hyperglycemia (>600), hyperosmolality (>320), and minimal ketones. Why the Distractors Are Tempting: - A) DKA has ketones and acidosis (absent here). - C) Addisonian crisis has low glucose and hyperkalemia (not seen here). - D) Thyroid storm has fever, tachycardia, and normal glucose (not hyperglycemia).

Question 3

A 35yo with known adrenal insufficiency presents with hypotension, Na+ 125, K+ 6.0. BP is 80/40 despite 2L NS. What’s the priority intervention? A) Start norepinephrine B) Give hydrocortisone 100mg IV C) Give 1 amp D50 D) Check cortisol level

Correct Answer: B Explanation: Steroids are lifesaving in Addisonian crisis (pressors won’t work without cortisol). Why the Distractors Are Tempting: - A) Pressors are ineffective without cortisol. - C) Hypoglycemia is common, but hypotension is the immediate threat. - D) Cortisol level is diagnostic but treatment is urgent (don’t wait for results).

Learning Path

1. Beginner:
2. Memorize red flags (e.g., Kussmaul respirations = DKA).
3. Practice fluid/insulin calculations for DKA.
4. Intermediate:
5. Learn electrolyte management (K+, phosphate).
6. Understand when to transition to subQ insulin.
7. Advanced:
8. Master thyroid storm scoring (Burch-Wartofsky).
9. Study adrenal insufficiency mimics (sepsis, hemorrhage).

Further Resources

• Books:
• Endocrine Emergencies (Lynn Loriaux)
• Tintinalli’s Emergency Medicine (DKA