# Stage 3 — Prioritize hypotheses. The 26-year-old client with type 1 diabetes has had 18 hours of nausea, vomiting, polyuria, and weakness after the insulin pump tubing kinked; little insulin has been delivered since the previous evening. The client had two beers 4 days ago and has not eaten since yesterday. The pump is now disconnected. HR 124/min, deep respirations 30/min, BP 96/60 mm Hg (usual 124/78), temperature 37.2 C, SpO2 98% on room air; mucous membranes are dry. Glucose 462 mg/dL, beta-hydroxybutyrate 5.8 mmol/L, venous pH 7.19, bicarbonate 10 mmol/L, potassium 5.4 mmol/L, sodium 130 mmol/L, creatinine 1.5 mg/dL, effective osmolality 286 mOsm/kg. Complete the diagram by selecting the condition the client is most likely experiencing, 2 actions the nurse should take to address that condition, and 2 parameters the nurse should monitor to assess the client's progress.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=617344&lang=en  
> language: en  
> subject: Establishing Priorities  
> category: MOC

## Question

Stage 3 — Prioritize hypotheses. The 26-year-old client with type 1 diabetes has had 18 hours of nausea, vomiting, polyuria, and weakness after the insulin pump tubing kinked; little insulin has been delivered since the previous evening. The client had two beers 4 days ago and has not eaten since yesterday. The pump is now disconnected. HR 124/min, deep respirations 30/min, BP 96/60 mm Hg (usual 124/78), temperature 37.2 C, SpO2 98% on room air; mucous membranes are dry. Glucose 462 mg/dL, beta-hydroxybutyrate 5.8 mmol/L, venous pH 7.19, bicarbonate 10 mmol/L, potassium 5.4 mmol/L, sodium 130 mmol/L, creatinine 1.5 mg/dL, effective osmolality 286 mOsm/kg. Complete the diagram by selecting the condition the client is most likely experiencing, 2 actions the nurse should take to address that condition, and 2 parameters the nurse should monitor to assess the client's progress.

Condition

Select 1
Hyperosmolar hyperglycemic state
Starvation ketosis
Diabetic ketoacidosis
Alcoholic ketoacidosis

Actions to take

Select 2
Infuse the prescribed isotonic crystalloid bolus
Give prescribed sodium bicarbonate for the low pH
Start the IV insulin infusion per protocol
Add prescribed potassium chloride to the IV fluid
Resume insulin through the pump with a new set

Parameters to monitor

Select 2
Urine ketones
Serum potassium
Serum lipase
Calculated effective osmolality
Serum beta-hydroxybutyrate

## Explanation

Glucose 462 mg/dL with beta-hydroxybutyrate 5.8 mmol/L, pH 7.19, and bicarbonate 10 mmol/L after interrupted pump insulin is diabetic ketoacidosis; effective osmolality 286 excludes HHS and marked hyperglycemia excludes starvation or alcoholic ketoacidosis. Isotonic fluid and a protocol IV insulin infusion treat the crisis, while potassium is withheld at 5.4 mmol/L and bicarbonate is not indicated at pH 7.19. Serum potassium and beta-hydroxybutyrate show whether treatment is safe and effective.

## In-depth explanation

Quick answer
Diabetic ketoacidosis. Take action: isotonic crystalloid bolus and a protocol IV insulin infusion. Monitor: serum potassium and serum beta-hydroxybutyrate.

Why this is correct
The pump failure removed insulin, so ketone production ran unchecked: beta-hydroxybutyrate 5.8 mmol/L, pH 7.19, and bicarbonate 10 mmol/L define DKA, and BP 96/60 with dry mucosa shows volume depletion. Fluids restore perfusion and lower glucose; IV insulin is what switches off ketogenesis. Potassium 5.4 mmol/L is above the replacement threshold, so insulin may start but potassium is not yet added. Because insulin drives potassium into cells, potassium must be trended closely; beta-hydroxybutyrate is the direct measure of whether the ketoacidosis is closing.

Easy analogy or mental picture
Picture a furnace burning fat because its insulin fuel line is kinked. Fluids refill the tank, insulin reopens the fuel line, and the potassium gauge drops fast once the line opens.

Memory hook
Kinked pump, ketones up: FLUIDS, then INSULIN, then watch K and ketones — not the sugar alone.

NCLEX decision rule
When a condition is defined by a lab abnormality (ketoacidosis), pick the monitor that measures that abnormality and the electrolyte the treatment shifts; pick actions that reverse the cause rather than cosmetic correction of one number.

Why the other choices are wrong
HHS needs an effective osmolality above about 320 mOsm/kg with little ketosis; starvation and alcoholic ketoacidosis occur with normal or low glucose, so glucose 462 rules them out even though the client drank and has not eaten. Bicarbonate is reserved for pH below 7.0, so giving it at 7.19 is outdated practice. Potassium replacement is correct later, once potassium falls below about 5.0–5.2 mmol/L, not at 5.4. Restarting the pump before the ketoacidosis resolves is a transition step for later. Urine ketones lag and can rise during recovery, osmolality tracks HHS, and lipase tracks pancreatitis rather than response to DKA therapy.

References
1Hyperglycemic Crises in Adults With Diabetes: A Consensus ReportDKA diagnostic criteria, fluids, insulin, potassium thresholds, bicarbonate limits, and ketone monitoring

## Clinical scenario

Case update
The pump is disconnected. The client remains tachycardic and volume depleted while emergency hyperglycemic-crisis orders are activated.

## Key concepts

- **Beta-hydroxybutyrate** — The main ketone in DKA; its serum level falls as insulin therapy stops ketogenesis.
- **Effective osmolality** — 2 × sodium plus glucose/18; values above about 320 mOsm/kg point toward HHS.
- **Potassium threshold** — IV insulin shifts potassium into cells, so potassium is replaced once it falls below about 5.0–5.2 mmol/L and insulin is held if below 3.5.

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