Student Memory Support
Insulin Therapy and Acute Diabetic Emergencies: Hypoglycemia, DKA, HHS and Lactic Acidosis
4th Year MBBS • Endocrine + Reproduction • High-yield memory reinforcement and last-minute KMU revision
Structured according to the supplied Student Memory Support requirements. :contentReference[oaicite:0]{index=0}
1. High-Yield Flashcards
Tap each question to reveal the answer.
Which insulin preparation is the classic intermediate-acting insulin?
NPH insulin.
Which insulin preparation is used intravenously in DKA?
Regular insulin.
How do porcine and bovine insulin differ structurally from human insulin?
Porcine insulin differs by one amino acid; bovine insulin differs by three.
What type of receptor mediates insulin action?
A receptor with intrinsic tyrosine-kinase activity.
Which glucose transporter is recruited to the cell membrane by insulin in skeletal muscle and adipose tissue?
GLUT4.
What is the most important acute complication of insulin therapy?
Hypoglycemia.
What are the two major groups of manifestations in hypoglycemia?
Autonomic symptoms and neuroglycopenic manifestations.
When is glucagon particularly useful in severe hypoglycemia?
When oral treatment is unsafe and intravenous glucose is not immediately available.
What metabolic process produces the acidosis in DKA?
Insulin deficiency causes lipolysis and hepatic ketone production, producing metabolic acidosis.
Why can serum potassium initially be normal or high in DKA despite potassium depletion?
Insulin deficiency and acidosis shift potassium out of cells despite total-body potassium loss from osmotic diuresis.
Which circulating ketone is particularly useful for blood monitoring in DKA?
Beta-hydroxybutyrate.
Why is severe ketosis less prominent in HHS than in DKA?
Residual insulin activity is generally sufficient to suppress major lipolysis and ketogenesis.
What is the central initial treatment problem in HHS?
Profound dehydration requiring careful intravenous fluid replacement.
Which biochemical abnormality identifies lactic acidosis?
Elevated blood lactate with metabolic acidosis, typically with an increased anion gap.
Which classic symptoms should trigger early assessment for Type 1 diabetes in a child?
Polyuria or new enuresis, polydipsia and weight loss.
Which findings in a diabetic child should raise immediate concern for DKA?
Vomiting, dehydration, deep rapid breathing and altered consciousness.
2. Mnemonics
Mnemonic Title:
Common DKA Precipitants
MISS
Missed/interrupted insulin • Infection • Severe physiological stress/acute illness • SGLT2 inhibitor-associated DKA
Mnemonic Title:
Core DKA Treatment Principles
FITS
Fluids • Insulin • Track and replace potassium • Search for and treat the precipitating cause
3. Memory Tables
Insulin Preparations — Rapid Recall
| Class | Examples | Key Memory Point | Main Role |
|---|---|---|---|
| Rapid-acting | Lispro, aspart, glulisine | Fast absorption | Prandial |
| Short-acting | Regular insulin | Slower than rapid analogues; IV use possible | Prandial / DKA |
| Intermediate | NPH | Protamine delays absorption; has a peak | Basal |
| Long-acting | Glargine, detemir | Relatively flat prolonged action | Basal |
| Ultra-long | Degludec | Very prolonged basal action | Basal |
DKA versus HHS
| Feature | DKA | HHS |
|---|---|---|
| Insulin deficiency | More severe | Relative |
| Ketosis | Prominent | Absent or limited |
| Acidosis | Major feature | Usually not dominant |
| Dehydration | Significant | Usually profound |
| Dominant biochemical clue | Ketones + metabolic acidosis | Marked hyperosmolality |
| Treatment emphasis | Fluids + insulin + potassium | Careful fluid replacement first |
4. Rapid Revision Points — Last-Minute Revision
Must Remember:
- Recombinant human insulin has the same amino-acid sequence as endogenous human insulin.
- Rapid and short-acting preparations mainly cover meals; longer-acting preparations provide basal insulin.
- Insulin lowers glucose and also suppresses lipolysis, hepatic glucose production and ketogenesis.
- Hypoglycemia can progress from sweating and tremor to confusion, seizure and coma.
- An unconscious hypoglycemic patient requires parenteral treatment rather than oral carbohydrate.
- DKA produces hyperglycemia, ketone accumulation and metabolic acidosis with dehydration.
- A normal or high initial serum potassium in DKA does not exclude major total-body potassium depletion.
- HHS is dominated by profound dehydration and hyperosmolality rather than severe ketoacidosis.
- Lactic acidosis management depends mainly on correcting hypoxia, hypoperfusion, sepsis or another precipitating cause.
- In a child, polyuria or new enuresis with thirst and weight loss should trigger prompt glucose assessment.
Common KMU trap: DKA and HHS may overlap; marked hyperosmolality does not exclude clinically significant ketosis and metabolic acidosis.
5. Clinical Memory Hooks
Missed insulin + vomiting + deep breathing → insulin deficiency → ketogenesis → DKA
Sweating + tremor + confusion after insulin → hypoglycemia → give rapid glucose if swallowing is safe
Older diabetic patient + extreme hyperglycemia + profound dehydration + confusion → HHS → severe hyperosmolality
Child with new enuresis + thirst + weight loss → suspect Type 1 diabetes → check glucose and assess ketones
6. Starred High-Yield Exam Points
- ⭐ Regular insulin is the key insulin preparation used intravenously during DKA treatment.
- ⭐ Insulin acts through a receptor tyrosine kinase and increases GLUT4-mediated glucose uptake in skeletal muscle and adipose tissue.
- ⭐ Severe insulin deficiency promotes lipolysis and hepatic ketogenesis, producing the metabolic acidosis of DKA.
- ⭐ Serum potassium can initially be normal or high in DKA despite substantial total-body potassium depletion.
- ⭐ Glucagon raises glucose mainly through hepatic glycogenolysis and is useful when severe hypoglycemia cannot be treated orally and IV access is unavailable.
- ⭐ HHS is characterized by severe hyperglycemia, profound dehydration and marked hyperosmolality with less prominent ketosis than DKA.
- ⭐ A child with diabetes, vomiting, dehydration and deep rapid breathing requires urgent assessment for DKA.