endocrineintermediate14 min read

Diabetes & DKA

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DKA Treatment: FIK Protocol

The treatment sequence for diabetic ketoacidosis follows a life-saving priority order.

Blood Glucose Levels in DKA

Understanding glucose ranges helps identify DKA severity.

0 mg/dLNormal: 70–100 mg/dL800 mg/dL

Typical DKA range

70 mg/dL100 mg/dL126 mg/dL250 mg/dL

At a Glance

In DKA, the body has no insulin, so cells cannot use glucose for energy. The body breaks down fat instead, producing ketones (which are acids). Blood sugar skyrockets (> 250 mg/dL), blood becomes acidic (pH < 7.35), and the patient becomes severely dehydrated. This is a medical emergency.

Plain-English Explanation

Imagine insulin as the key that unlocks cell doors so glucose can enter. In Type 1 diabetes, the body makes no insulin — so glucose piles up in the blood with nowhere to go. Cells are starving despite high blood sugar. The body switches to burning fat for fuel, which produces acidic byproducts called ketones. These ketones make the blood dangerously acidic. The body tries to fix the acid by breathing faster and deeper (Kussmaul respirations — blowing off CO2 to raise pH). The high blood sugar pulls water out through the kidneys (osmotic diuresis), causing severe dehydration. That is why fluids come first in treatment — the patient may have lost 3-6 liters of fluid.

Must-Know NCLEX Points

DKA occurs primarily in Type 1 Diabetes (can rarely occur in Type 2)
Diagnostic criteria: blood glucose > 250 mg/dL + ketones present + pH < 7.35
Kussmaul respirations (deep, rapid breathing) — compensatory mechanism to blow off CO2
Fruity/acetone breath odor from ketone production
Treatment priorities: IV fluids FIRST, then insulin drip, then potassium replacement
NEVER give insulin before checking potassium — insulin drives K+ into cells
If K+ < 3.3 mEq/L, replace potassium BEFORE starting insulin
Monitor potassium closely — it will drop rapidly with insulin
Most common trigger for DKA: infection

DKA vs HHS

DKA

Type 1 Diabetes (usually)
Blood glucose > 250 mg/dL (often 300-800)
Ketones: PRESENT
pH < 7.35 (metabolic acidosis)
Kussmaul respirations
Fruity/acetone breath
Onset: hours to 1-2 days
Treated with insulin drip + IV fluids + K+

HHS (Hyperosmolar Hyperglycemic State)

Type 2 Diabetes (usually)
Blood glucose > 600 mg/dL (often > 1000)
Ketones: ABSENT or minimal
pH usually normal (no significant acidosis)
No Kussmaul breathing
No fruity breath
Onset: days to weeks
Higher mortality rate than DKA

Signs and Symptoms

Polyuria, polydipsia, polyphagia (3 P's)
Kussmaul respirations (deep, rapid)
Fruity/acetone breath
Nausea, vomiting, abdominal pain
Dehydration (dry mucous membranes, poor skin turgor, tachycardia)
Altered mental status (confusion → lethargy → coma if untreated)
Warm, dry, flushed skin
Hypotension
Weight loss (despite polyphagia)

Red Flags

pH < 7.1 — severe acidosis, may need bicarbonate
Potassium < 3.3 mEq/L before starting insulin — must replace K+ first
Altered level of consciousness or unresponsiveness
Cardiac dysrhythmias from electrolyte shifts
Respiratory failure from exhaustion of compensatory breathing
Cerebral edema (especially in pediatric patients during treatment)

Nursing Interventions

1. IV normal saline (0.9% NS) — aggressive fluid resuscitation FIRST
2. Check potassium before starting insulin
3. Continuous IV insulin drip (regular insulin only for IV)
4. Replace potassium as needed (K+ drops rapidly with insulin therapy)
5. Monitor blood glucose every 1-2 hours
6. Monitor ABGs, electrolytes, and BUN/creatinine frequently
7. Continuous cardiac monitoring
8. Strict I&O with Foley catheter for accurate measurement
9. When glucose reaches ~200-250 mg/dL, switch IV fluid to D5 with 0.45% NS to prevent hypoglycemia
10. Identify and treat the underlying trigger (infection is the most common)

Medication Focus

Regular Insulin (Humulin R): the ONLY insulin type given IV — continuous drip
IV Fluids: 0.9% NS initially, then D5 with 0.45% NS when glucose ~200-250 mg/dL
Potassium Chloride (KCl): replace as K+ drops with insulin therapy
Sodium Bicarbonate: only if pH < 6.9-7.0 (used cautiously — can worsen hypokalemia)

Patient Teaching

Never skip insulin doses, even when feeling sick ("sick day rules")
During illness: check blood glucose and urine ketones more frequently
Stay hydrated during illness — drink plenty of sugar-free fluids
Know the signs of DKA: nausea, vomiting, abdominal pain, fruity breath, rapid breathing
Carry medical identification at all times
Recognize and treat hypoglycemia (the "Rule of 15": 15g fast-acting carbs, recheck in 15 min)

Memory Aid

DKA treatment order — "FIK" (Fix It, Kid): F — Fluids first (IV NS) I — Insulin drip (after checking K+) K — Potassium (replace and monitor) 3 P's of Diabetes: Polyuria (lots of peeing) Polydipsia (lots of drinking) Polyphagia (lots of eating) Hot, dry = sugar high (hyperglycemia/DKA) Cold, clammy = need some candy (hypoglycemia)

NCLEX Strategy

DKA vs HHS comparison is a favorite NCLEX topic. Key differences: DKA = Type 1, ketones present, acidosis, fruity breath, Kussmaul respirations. HHS = Type 2, no ketones, extremely high glucose (often > 1000). Treatment priority questions: IV fluids come BEFORE insulin. Potassium monitoring is critical — the classic question asks "what must you check before starting an insulin drip?" (answer: potassium). If K+ < 3.3, replace K+ BEFORE starting insulin. When glucose drops to around 200-250 mg/dL, the IV is switched to a dextrose-containing solution to prevent hypoglycemia — do not stop the insulin drip until the acidosis resolves.

Quick Check

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