Sugar, We're Goin Down
Two patients arrive with severe hyperglycemia.
Patient A: glucose 468 mg/dL, positive ketones, pH 7.24
Patient B: glucose 842 mg/dL, minimal ketones, profound dehydration
Which patient most likely has DKA, and which has HHS?
Patient A = DKA; Patient B = HHS
Teaching point: DKA is characterized by ketosis and metabolic acidosis. HHS typically involves more extreme hyperglycemia and dehydration with little or no significant ketoacidosis.
A patient arrives with severe DKA and significant dehydration.
Before insulin can fix the metabolic problem, this treatment helps restore circulating volume and tissue perfusion.
Answer:
What are isotonic IV fluids?
Teaching point: Fluid replacement is a major initial priority because osmotic diuresis causes significant volume depletion.
A patient begins having a generalized tonic-clonic seizure.
Which action gets shaken off the nursing care plan?
A. Protect the patient's head
B. Turn the patient to the side when possible
C. Place an object in the patient's mouth
D. Move nearby objects away
Answer:
What is C — place an object in the patient's mouth?
Teaching point: Nothing should be placed in the mouth during a seizure. Protect the patient from injury and support the airway without restraining them.
The nurse assesses eye opening, verbal response, and motor response to generate this neurologic score.
Answer:
What is the Glasgow Coma Scale (GCS)?
Teaching point: GCS provides a standardized way to describe level of consciousness using eye, verbal, and motor responses.
In many neurologic emergencies, this is often one of the earliest and most sensitive signs that the patient's condition is worsening.
A. Fever
B. Change in level of consciousness
C. Abnormal posturing
D. Cushing's triad
Answer:
What is B — change in level of consciousness?
Teaching point: A subtle change in LOC may occur before later, more dramatic signs of neurologic deterioration.
A patient with DKA is breathing deeply and rapidly even though the SpO₂ is 98%.
The lungs aren't the problem. So why are they breathing like that?
Answer:
What is compensation for metabolic acidosis?
Teaching point: Kussmaul respirations help decrease CO₂ as the body attempts to compensate for metabolic acidosis.
A patient with DKA has a potassium of 5.4 mEq/L (3.5–5.0) before treatment.
A student says:
“Their potassium is already high, so insulin will make the hyperkalemia worse.”
Correct them. What will insulin do to the potassium?
It will shift potassium from the blood into the cells, lowering the serum potassium level.
Teaching point: The serum potassium may initially be normal or elevated in DKA even though total-body potassium is depleted. Once insulin is given, serum potassium can fall quickly.
The seizure has stopped. The patient is sleepy, confused, and cannot remember what happened.
The patient's family asks, “Are they having another seizure?”
What phase are they most likely seeing?
Answer:
What is the postictal phase?
Teaching point: Altered LOC, confusion, fatigue, headache, and amnesia can occur after a seizure. The nurse continues airway, respiratory, and neurologic assessment during this period.
A patient's GCS changes from 15 at 0800 to 13 at 1000.
The patient is still awake and talking.
Why does the nurse care about a change of only 2 points?
Answer:
Because a decreasing GCS represents a change in neurologic status and may indicate deterioration, even if the patient is still responsive.
Teaching point: With neuro patients, trends matter. Don't wait for someone to become unresponsive before taking a change in LOC seriously.
A patient with increased intracranial pressure develops:
Name this ominous trio.
Answer:
What is Cushing's triad?
Teaching point: Cushing's triad is a late sign of significantly increased ICP and suggests serious neurologic deterioration.
Clue:
Both DKA and HHS can cause severe dehydration.
But why does extremely high blood glucose make a patient lose so much water in the first place?
Answer:
What is osmotic diuresis?
Teaching point: Excess glucose spills into the urine and pulls water with it, causing polyuria, dehydration, and electrolyte losses.
A patient with DKA has:
The IV fluids are already infusing.
The nurse has prescriptions for IV potassium replacement and an IV insulin infusion.
Which one needs attention before the insulin starts?
Answer:
What is potassium replacement?
Teaching point: Insulin will drive potassium into the cells and can worsen existing hypokalemia. Significant hypokalemia must be addressed before initiating insulin.
During a seizure, the nurse notices:
Why is it important for the nurse to document what happened first, rather than simply charting “patient had a seizure”?
Answer:
The onset and progression of seizure activity provide information about the seizure pattern and possible area of the brain involved.
Teaching point: Good seizure assessment includes what happened before, during, and after the event—not just how long it lasted.
The nurse shines a light into a patient's right eye.
The right pupil constricts — and so does the left pupil.
What response did the nurse just assess?
Answer:
The pupillary light responses.
Teaching point: The pupil receiving the light should constrict directly, while the opposite pupil should also constrict consensually.
After a neurologic injury, the patient's arms flex inward toward the chest, while the legs remain extended.
Name the abnormal posturing.
Answer:
What is decorticate posturing?
Teaching point: Think flexion toward the core for decorticate.
A patient has:
A student says:
“The glucose is really high and they're confused, so this must be HHS.”
What did the student miss?
Answer:
The metabolic acidosis and positive ketones point toward DKA, despite the severe hyperglycemia and altered mental status.
Teaching point: Don't diagnose the emergency from the glucose number alone. Look at the whole metabolic picture.
A patient being treated for DKA now has:
The nurse sees a new order to add dextrose to the IV fluids while continuing insulin.
A student asks:
“Why are we giving sugar to someone in DKA?”
Answer:
Dextrose helps prevent hypoglycemia while allowing insulin to continue correcting the ketosis and acidosis.
Teaching point: The glucose can improve before the ketoacidosis has resolved. Insulin may therefore need to continue after glucose approaches the target range.
A hospitalized patient has a generalized seizure lasting 2 minutes. The patient does not regain consciousness and begins having another seizure.
What makes this situation different from an expected postictal period?
Answer:
The patient is having recurrent seizure activity without recovery of consciousness, raising concern for status epilepticus.
Teaching point: Failure to recover between seizures is a major red flag and requires rapid intervention.
A patient opens their eyes to speech, speaks with confused conversation, and localizes pain.
Calculate the GCS.
Answer:
12
3 + 4 + 5 = 12
During reassessment, the nurse observes:
The patient previously demonstrated flexion of the arms toward the chest.
Name the new posturing AND tell me why the change matters.
Answer:
What is decerebrate posturing, and the change from decorticate to decerebrate suggests worsening neurologic dysfunction**?
Teaching point: Decerebrate posturing generally reflects more severe neurologic dysfunction than decorticate posturing. The change from the patient's previous response is particularly concerning.
A patient with type 1 diabetes develops pneumonia and has had very little to eat for 24 hours.
The patient asks:
“If I haven't eaten, where is all this glucose coming from—and how can I still end up in DKA?”
Explain the connection.
Answer:
During illness and insulin deficiency, counterregulatory hormones increase glucose production while cells cannot effectively use the available glucose; the body then breaks down fat for energy, producing ketones and metabolic acidosis.
Teaching point: DKA isn't simply caused by “eating too much sugar.” Insulin deficiency plus the stress response drives hyperglycemia and ketone production.
Clue:
Two patients have been receiving treatment for hyperglycemic emergencies.
Patient A
Patient B
Both glucose levels look much better.
Which patient has actually corrected the ketoacidosis?
Answer:
Patient A.
Teaching point: Don't use glucose alone to decide whether DKA has resolved. Patient A has correction of the acidosis and ketosis; Patient B remains acidotic with ongoing ketosis despite the much lower glucose.
A patient taking phenytoin says:
“I haven't had a seizure in months, so I've started skipping doses. Yesterday I felt strange for a few seconds, but nothing really happened.”
The patient's spouse adds:
“They just stared straight ahead and wouldn't answer me for about 20 seconds.”
What two assumptions in this conversation should the nurse challenge?
Answer:
Teaching point: Seizures can present in different ways, and medication adherence remains important even when generalized seizure activity has been controlled.
A patient with a neurologic injury is awake and follows commands. During reassessment, the nurse discovers that the right pupil is now larger than the left and reacts sluggishly to light.
The patient's GCS has not changed.
A student says:
“They're still awake and following commands, so I don't think it's urgent.”
What's wrong with that reasoning?
Answer:
A new unequal/sluggish pupil is an acute neurologic change and can indicate worsening intracranial dysfunction even before the patient's overall LOC changes.
Teaching point: A neuro assessment isn't one number. LOC, pupils, motor response, speech, strength, and other findings have to be interpreted together and compared with the patient's baseline.
A patient with a head injury had a GCS of 13 two hours ago. The nurse now finds:
What story are these signs telling you?
Answer:
The patient is showing severe neurologic deterioration with findings consistent with increasing intracranial pressure and possible impending brain herniation.
Teaching point: This is about clustering cues:
↓ GCS + pupillary change + widening pulse pressure/bradycardia/irregular respirations + decerebrate posturing = neurologic emergency.