# An adult with diabetic ketoacidosis has glucose 548 mg/dL, pH 7.18, potassium 3.1 mmol/L, and Kussmaul respirations. Complete the initial potassium and insulin plan. > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=396062&lang=en > language: en > subject: Medical Emergencies > category: PA ## Question An adult with diabetic ketoacidosis has glucose 548 mg/dL, pH 7.18, potassium 3.1 mmol/L, and Kussmaul respirations. Complete the initial potassium and insulin plan. The nurse should ::선택::begin prescribed potassium replacement at about 10 mmol/hstart sodium bicarbonate instead of potassiumrestrict all IV fluidsgive an oral glucose load and ::선택::start insulin immediately at full ratedelay insulin therapygive a one-time insulin bolus onlystop all glucose monitoring. Insulin can begin when potassium is ::선택::below 2.0 mmol/Lexactly 3.0 mmol/Labove 3.5 mmol/Labove 5.5 mmol/L, while the team ::선택::continue cardiac and serial electrolyte monitoringrecheck potassium only at dischargestop monitoring after one replacement doseignore respiratory muscle weakness. ## Explanation A potassium of 3.1 mmol/L is below the current 3.5 mmol/L threshold. Begin prescribed potassium replacement at about 10 mmol/h and delay insulin because insulin shifts potassium into cells and can precipitate lethal arrhythmias or respiratory muscle weakness. Start insulin only after potassium rises above 3.5 mmol/L. Potassium should be rechecked 2 hours after insulin starts and every 4 hours thereafter until DKA resolves, with closer monitoring as clinically indicated. ## In-depth explanation Correct Answer Begin prescribed potassium replacement at about 10 mmol/h, delay insulin, and start insulin only after potassium rises above 3.5 mmol/L while continuing cardiac and electrolyte monitoring. Why It Fits DKA causes total-body potassium depletion even when the initial serum value is normal or high. Here the serum potassium is already low. Insulin would shift more potassium into cells and can trigger life-threatening arrhythmias or respiratory muscle weakness. Clinical Picture Insulin opens the cell door for both glucose and potassium. When the bloodstream is already short of potassium, opening that door first can make the blood level fall dangerously low. Memory Link K below 3.5: replace at about 10 mmol/h, hold insulin, restart above 3.5. NCLEX Rule In DKA, check potassium before insulin. The current adult consensus uses 3.5 mmol/L, not the older 3.3 mmol/L threshold. Safety takes priority over immediately lowering glucose. Why the Alternatives Fail Starting insulin immediately can worsen hypokalemia. Waiting until potassium exceeds 5.0 mmol/L delays necessary DKA therapy. Bicarbonate is not a substitute for potassium replacement and is generally reserved for severe acidosis with pH below 7.0. Source 12024 Consensus Report: Hyperglycemic Crises in Adults With Diabetes ## Clinical scenario IV fluid resuscitation has begun. Urine output and renal function are being evaluated, and the nurse is preparing the electrolyte and insulin orders under the DKA protocol. ## Key concepts - **DKA** — Diabetic ketoacidosis with hyperglycemia, ketosis, and acidosis. - **Potassium** — An electrolyte that may fall quickly during insulin therapy. - **Kussmaul Respirations** — Deep rapid respirations associated with metabolic acidosis. ## Related questions - [A nurse is caring for an alert adult client with type 1 diabetes who reports tremors, swea…](https://mymerci.kr/pages/nclex_q.php?qn_id=360524&lang=en) - [A 58-year-old client arrives at the emergency department with crushing substernal chest pa…](https://mymerci.kr/pages/nclex_q.php?qn_id=362976&lang=en) - [A 72-year-old client is brought to the emergency department by family who report that the …](https://mymerci.kr/pages/nclex_q.php?qn_id=363003&lang=en) - [A 79-year-old client is admitted from a long-term care facility with diarrhea, decreased o…](https://mymerci.kr/pages/nclex_q.php?qn_id=363089&lang=en) - [A 68-year-old client is admitted to the emergency department with suspected sepsis from a …](https://mymerci.kr/pages/nclex_q.php?qn_id=363987&lang=en) - [A nurse is caring for an adult client in the emergency department who is suspected to have…](https://mymerci.kr/pages/nclex_q.php?qn_id=363993&lang=en) - [A nurse is teaching a 72-year-old client with chronic heart failure (reduced ejection frac…](https://mymerci.kr/pages/nclex_q.php?qn_id=366202&lang=en) - [A nurse is caring for an adult client admitted with diabetic ketoacidosis. 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