CCS Diabetic Emergencies: DKA, HHS & Hypoglycemia (2026)

Diabetic emergencies are high-yield CCS cases that test your ability to recognize hyperglycemic crises, calculate anion gaps, initiate insulin and fluid protocols, and monitor electrolyte corrections. On CCS, a patient with DKA or HHS will present with altered mental status, labored breathing, or vague symptoms like "not feeling well." You must rapidly recognize the hyperglycemic emergency, order the right labs, and execute the correct treatment algorithm before complications like cerebral edema or thrombotic stroke occur. This article is your complete clinical guide to passing CCS diabetic emergency cases with confidence.

Diabetic Ketoacidosis (DKA): Recognition and Pathophysiology

DKA is an acute metabolic emergency characterized by hyperglycemia, ketosis, and metabolic acidosis. It occurs in type 1 diabetes (and occasionally in type 2) when insulin deficiency triggers rapid lipolysis, free fatty acid oxidation, and ketone body accumulation.

DKA Clinical Presentation

• Classic triad: Polyuria, polydipsia, weight loss (over days to weeks before acute episode)

• Acute presentation: Nausea, vomiting, abdominal pain, altered mental status, labored breathing (Kussmaul respirations)

• Precipitants: Infection (UTI, pneumonia), medication non-compliance, new-onset diabetes, acute illness (MI, CVA), pancreatitis

• Vital signs: Tachycardia, tachypnea, hypotension (from dehydration), fever (if infection present)

• Exam: Fruity-smelling breath (from acetone), dry mucous membranes, poor skin turgor, Kussmaul breathing (rapid, deep, labored)

DKA Diagnostic Criteria

• Serum or urine ketones (positive)

• Arterial pH <7.35

• Serum bicarbonate <18 mEq/L

• Anion gap ≥10 (typically >16 in moderate-to-severe DKA)

• Blood glucose usually >250 mg/dL (but can be lower or even <200 in euglycemic DKA)

> Study Tip: The StudyCCS question bank includes 12+ DKA cases covering all severity levels and precipitants. Real-time grading shows which labs you should order, when to calculate anion gap, and how to adjust your insulin drip.

Severity Classification

• Mild DKA: pH 7.25-7.30, HCO3 15-18, alert mental status

• Moderate DKA: pH 7.10-7.24, HCO3 10-14, altered mental status

• Severe DKA: pH <7.10, HCO3 <10, severe altered mental status or coma

DKA Management Protocol: Step-by-Step Execution

Step 1: Immediate Assessment and Stabilization (First 15 Minutes)

• Airway/Breathing: Supplemental O2 to target SpO2 >94%. If severely altered mental status, consider intubation.

• IV access: Two large-bore IVs (18-gauge or larger). If no peripheral access, consider central line.

• Cardiac monitoring: Continuous pulse oximetry, ECG (assess for hyperkalemia pattern: peaked T waves, widened QRS).

• Initial labs:

◦ Serum glucose, electrolytes (Na, K, Cl), BUN, creatinine, phosphate, magnesium

◦ Arterial blood gas (ABG) or venous blood gas (VBG) to assess pH and HCO3

◦ Serum or urine ketones

◦ Urinalysis (look for UTI, precipitant)

◦ Blood culture if fever present

◦ EKG to assess for hyperkalemia

Order on CCS:

"Stat labs: glucose, CMP, ABG, serum ketones, urinalysis, blood culture. Continuous cardiac monitoring. Two large-bore IVs. Foley catheter. Supplemental oxygen to SpO2 >94%."

Step 2: Fluid Resuscitation (First 1-2 Hours)

DKA patients are severely dehydrated (average 6-10L deficit). Aggressive fluid replacement is critical.

• First hour: Normal saline 1 L IV over 15-30 minutes. Reassess vital signs.

◦ Goal: SBP >90, HR <100, urine output >0.5 mL/kg/hr

◦ If improving, continue normal saline at 500 mL/hr

◦ If shock or no improvement, consider second liter of NS and prepare for pressors

• Subsequent hours: Once glucose <250 mg/dL, switch to D5-normal saline or D5-half normal saline to prevent hypoglycemia while correcting hyperglycemia and ketosis

• Avoid: Hypotonic fluids initially (risk of cerebral edema)

• Monitor: Urine output, BP, heart rate, JVD, lung sounds q15-30 min initially

Order on CCS:

"IV fluids: Normal saline 1 L over 15 minutes, then reassess. Target UOP >0.5 mL/kg/hr."

Step 3: Insulin Drip (Starts After Potassium Assessed)

This is the critical step on CCS. You cannot start insulin until serum potassium is known (risk of fatal hypokalemia from shifting intracellular).

• Prerequisites: K+ >3.5 mEq/L

◦ If K+ <3.5, give IV KCl FIRST (20-40 mEq over 1 hour). Recheck K+. Then start insulin.

◦ If K+ normal to high, start insulin immediately.

Insulin Protocol:

• Loading: 0.1 units/kg IV bolus (or skip bolus, go straight to drip)

• Drip: Start at 0.1 units/kg/hr (e.g., 100 kg patient = 10 units/hr)

• Target: Decrease serum glucose by 50-100 mg/dL/hr

◦ If glucose not dropping fast enough, increase drip by 50%

◦ If glucose dropping >100 mg/dL/hr, decrease drip by 50%

• Transition: Continue drip until anion gap closes (AG <12), HCO3 >15, patient tolerating oral intake, and glucose <200 mg/dL

Order on CCS:

"Check potassium STAT. If K+ >3.5, start regular insulin drip at 0.1 units/kg/hr. Target glucose decrease 50-100 mg/dL/hr. Recheck glucose q1h and adjust drip accordingly."

Step 4: Electrolyte Replacement

As insulin drives glucose into cells, potassium follows, causing potentially fatal hypokalemia. Aggressive K+ replacement is mandatory.

• K+ replacement: Start once K+ drops below upper normal (usually after insulin started 1-2 hours)

◦ If K+ 3.5-5.0: Add 20-40 mEq KCl to each liter of IV fluid (goal rate 10-20 mEq/hr)

◦ If K+ <3.5: Give 20-40 mEq IV KCl over 1-2 hours before restarting insulin

◦ If K+ >5.5 (hyperkalemia): Treat hyperkalemia (see below) before insulin

• Phosphate replacement: DKA depletes total body phosphate. If severe depletion, give potassium phosphate instead of potassium chloride.

• Magnesium replacement: If Mg low, give IV MgSO4 1-2 grams over 1-2 hours. Monitor for hypermagnesemia.

Order on CCS:

"K+ repletion protocol: If K+ 3.5-5.0, add 20 mEq KCl to each liter NS. Recheck K+ q2-4h. Goal K+ 4-5 mEq/L."

Step 5: Monitoring and Reassessment

• Labs: Recheck glucose, electrolytes, pH, HCO3, anion gap q2-4h initially, then q4-6h

• Vitals: Monitor BP, HR, RR, SpO2, urine output q15-30 min initially, q1-2h as stable

• Mental status: Reassess q30-60 min. Improvement expected as acidosis corrects.

• Look for complications: Cerebral edema (headache, altered mental status worsening despite treatment), infection, rhabdomyolysis

Transition to Subcutaneous Insulin

Once anion gap closed, HCO3 >15, glucose <200, and patient tolerating oral intake:

• Continue IV insulin drip 1-2 hours after starting subcutaneous insulin to ensure overlap

• Subcutaneous regimen: Long-acting insulin (glargine or degludec) + rapid-acting insulin with meals + correctional scale

• Endocrinology consult: For long-term insulin regimen and diabetes education

Order on CCS:

"Once AG <12 and patient tolerating PO, start subcutaneous insulin: glargine 10 units daily + lispro 10 units with meals. Continue IV insulin drip 1-2 hours overlap. Endocrinology consult."

> Practice Alert: This is one of the highest-yield CCS topics on Step 3. Practice the DKA protocol in the StudyCCS question bank to build the reflexes you need on exam day. You must know when to start insulin, how to dose it, and when to correct electrolytes.

Hyperglycemic Hyperosmolar State (HHS): Recognition and Management

HHS is a hyperglycemic emergency that occurs primarily in type 2 diabetes. It's characterized by severe hyperglycemia (often >600 mg/dL), increased osmolarity, and relative insulin deficiency without significant ketosis. Mortality is higher than DKA (5-15% vs. <1%).

HHS Clinical Presentation

• Onset: More insidious than DKA, often over days to weeks

• Symptoms: Lethargy, confusion, polyuria, polydipsia, weakness

• Precipitants: Dehydration, infection, medication non-compliance, acute illness, elderly patients (less likely to drink enough)

• Vital signs: Often more severe hypotension and tachycardia than DKA

• Exam: Severe dehydration signs (poor skin turgor, dry mucous membranes), altered mental status is common, no fruity breath smell

HHS Diagnostic Criteria

• Serum glucose usually >600 mg/dL (often >1000)

• Effective osmolarity >320 mOsm/kg (normal <280)

◦ Calculated osmolarity = 2[Na] + glucose/18 + BUN/2.8

• Serum or urine ketones minimal or absent (little to no ketosis)

• Arterial pH >7.30 (mild acidosis or normal pH)

• HCO3 >18 mEq/L (minimal to no acidosis)

• Anion gap normal or slightly elevated (<12)

Key Differences: DKA vs. HHS

HHS Management: Similar to DKA with Key Differences

Fluid resuscitation is EVEN MORE AGGRESSIVE in HHS:

• First hour: Normal saline 1-1.5 L IV over 30-60 minutes (higher dehydration deficit)

• Subsequent hours: Continue NS at 500 mL/hr, then 250-500 mL/hr as osmolarity corrects

• Goal: Normalize serum osmolarity slowly (drop ~3-8 mOsm/kg/hr) to avoid cerebral edema

• Switch to hypotonic fluids once glucose <250 and osmolarity normalizing

Insulin in HHS:

• Start later than in DKA (after initial hydration)

• Why: Aggressive fluid resuscitation alone often drops glucose 50-100 mg/dL/hr. Premature insulin risks hypoglycemia.

• Protocol: Start insulin 0.05-0.1 units/kg/hr (lower dose than DKA) once glucose stops dropping with fluids alone

• Transition: As in DKA, switch to subcutaneous insulin once stable

Thromboembolism prophylaxis:

• HHS patients are hypercoagulable. Initiate DVT prophylaxis (sequential compression devices ± SC heparin) unless contraindicated.

Order on CCS:

"HHS protocol: Aggressive NS resuscitation 1-1.5 L over 30-60 min. Continuous monitoring. Once glucose <300 and not dropping, start insulin 0.05 units/kg/hr. DVT prophylaxis with SCD. Endocrinology consult."

> Study Tip: CCS often tests your ability to distinguish DKA from HHS and tailor your management accordingly. The StudyCCS question bank includes 8+ cases comparing these two emergencies.

Hypoglycemia: Recognition, Treatment, and Driving Safety

Hypoglycemia is a potentially life-threatening complication of diabetes treatment. On CCS, a diabetic patient may present with altered mental status, seizure, or coma due to hypoglycemia.

Hypoglycemia Symptoms (Whipple's Triad)

1. Symptoms of hypoglycemia: Tremor, palpitations, diaphoresis, anxiety (adrenergic), OR confusion, drowsiness, difficulty concentrating (neuroglycopenic)

2. Low blood glucose: <70 mg/dL by fingerstick

3. Relief of symptoms after glucose administration

Hypoglycemia Severity

• Mild (conscious, able to self-treat): Glucose 54-70 mg/dL

• Moderate (confused but arousal possible): Glucose 40-54 mg/dL

• Severe (unconscious, seizure, or coma): Glucose <40 mg/dL

Hypoglycemia Management on CCS

Mild-to-Moderate Hypoglycemia (Patient Alert, Can Swallow):

• Fast-acting carbs: 15 grams (juice, glucose tablets, honey, hard candy)

• Recheck glucose in 15 minutes. If still <70, repeat.

• Once >70, give long-acting carbs (slice of bread, crackers with cheese) to prevent rebound hypoglycemia

• Order on CCS: "Fingerstick glucose. If <70, give 15 grams fast carbs PO. Recheck q15 min. Once >70, give long-acting carbs."

Severe Hypoglycemia (Unconscious, Seizure, or Cannot Swallow):

• IV dextrose: 25 mL of 50% dextrose (D50) IV push. Recheck glucose in 5 minutes.

◦ Alternative: 100 mL of 10% dextrose (D10) if D50 not available (safer, less sclerosing)

◦ If no IV access: IM glucagon 1 mg, or intranasal glucagon (if available)

• Follow-up glucose check: q5-15 min until stable >70

• Continuous glucose monitoring: Prolonged hypoglycemia can cause seizure, cerebral edema, cardiac arrhythmias, death

• Order on CCS: "STAT fingerstick glucose. If <40 or patient unconscious: IV D50 25 mL push. Recheck glucose q5 min. Continuous monitoring. Once glucose >70, assess mental status. Endocrinology consult."

Hypoglycemia Unawareness and Driving Safety

• Hypoglycemia unawareness: Some diabetics (especially type 1 with long duration) lose adrenergic symptoms and don't feel hypoglycemia until neuroglycopenic symptoms appear.

• On CCS: If patient has hypoglycemia unawareness or recurrent severe hypoglycemia, counsel that they should not drive until episodes controlled.

• Order: "Inform patient that recurrent severe hypoglycemia is unsafe for driving. Recommend checking glucose before driving. Refer to endocrinology for intensive diabetes management."

Don't-Miss Diagnoses in Hyperglycemic Crises

• Euglycemic DKA: DKA with glucose <200 mg/dL (more common in SGLT2 inhibitor users). Can be missed if relying on glucose >250 as criterion. Look for anion gap acidosis + ketosis + normal glucose.

• Infection as precipitant: UTI, pneumonia, sepsis, meningitis. Always order cultures and consider antibiotics early.

• Acute coronary syndrome: DKA can be triggered by MI. Always get EKG in older patients or those with cardiac risk factors.

• Pancreatitis: Amylase/lipase elevation common in DKA. If persistently elevated, investigate for acute pancreatitis (imaging, surgical consult).

• Cerebral edema: Rare but fatal. Headache, altered mental status worsening despite treatment, seizure, coma. Treat with mannitol, head of bed elevation, avoid rapid osmolarity correction.

• Rhabdomyolysis: Severe DKA or crush injury. CK markedly elevated. Risk of acute kidney injury. Aggressive IV hydration, monitor urine output, check myoglobin in urine.

Complete Order Set: Diabetic Emergencies Template

DKA/HHS Immediate Orders:

• Stat labs: Glucose, CMP (Na, K, Cl, CO2, BUN, Cr), ABG/VBG, serum/urine ketones, urinalysis, blood culture

• Two large-bore IVs; continuous cardiac monitoring

• Supplemental O2 (SpO2 >94%); Foley catheter

• ECG (assess hyperkalemia pattern)

• IV fluids: Normal saline 1 L over 15-30 min (DKA) or 1-1.5 L over 30-60 min (HHS)

• Insulin drip (start once K+ >3.5): 0.1 units/kg/hr, target glucose drop 50-100 mg/dL/hr

• K+ repletion: If K+ 3.5-5.0, add 20 mEq KCl to each liter NS

• Repeat labs q2-4h: Glucose, CMP, ABG, AG, HCO3

Additional Considerations:

• Investigate precipitant: Blood culture if fever, abdominal imaging if RUQ pain, chest imaging if respiratory symptoms

• Antibiotics if infection suspected (empiric broad-spectrum pending culture)

• DVT prophylaxis (HHS patients; SCD, SC heparin)

• ICU admission: Severe acidosis (pH <7.10), altered mental status, hemodynamic instability, or need for frequent monitoring

Discharge Planning:

• Endocrinology consult

• Diabetes education

• Counseling on sick day management, medication compliance, driving safety

• Follow-up with primary care within 1 week

2-Minute Screen: Diabetic Emergency Case Recognition

You see a case stem with a diabetic patient. Quick assessment:

Red flags for hyperglycemic emergency:

• Altered mental status, confusion, drowsiness

• Nausea/vomiting, abdominal pain

• Fruity-smelling breath (DKA), severe dehydration (HHS)

• Vital signs: Tachycardia, tachypnea, hypotension

Your action:

1. Fingerstick glucose immediately. If >250, suspect DKA or HHS.

2. Check labs: CMP (Na, K, Cl), ABG/VBG, serum ketones, urinalysis.

3. Calculate anion gap: AG = Na - (Cl + HCO3). If >12 and glucose >250, think DKA.

4. Assess acuity: pH <7.35 and HCO3 <18 = DKA. pH normal and glucose >600 = HHS.

5. Start protocol: Fluids, insulin (after K+ checked), electrolyte repletion.

Ready to Practice?

The StudyCCS question bank includes 20+ diabetic emergency cases covering DKA, HHS, euglycemic DKA, and hypoglycemia. Each case has real-time scoring so you know exactly when to start insulin, how to dose it, and how to correct electrolytes. Practice a case today and build the reflexes you need on exam day.

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