Mixed DKA/HHS management US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Mixed DKA/HHS management. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Mixed DKA/HHS management US Medical PG Question 1: A 61-year-old female with congestive heart failure and type 2 diabetes is brought to the emergency room by her husband because of an altered mental status. He states he normally helps her be compliant with her medications, but he had been away for several days. On physical exam, her temperature is 37.2 C, BP 85/55, and HR 130. Serum glucose is 500 mg/dL. Which of the following is the first step in the management of this patient?
- A. IV ½ NS
- B. IV insulin
- C. Subcutaneous insulin injection
- D. IV NS (Correct Answer)
- E. IV D5W
Mixed DKA/HHS management Explanation: ***IV NS***
- The patient presents with **hypotension (85/55 mmHg)** and **tachycardia (130 bpm)**, indicating significant **volume depletion** despite a history of congestive heart failure.
- **Isotonic intravenous fluids (e.g., normal saline)** are crucial in the initial management of **diabetic ketoacidosis (DKA)** or **hyperosmolar hyperglycemic state (HHS)** to restore intravascular volume and improve tissue perfusion.
*IV ½ NS*
- **Hypotonic solutions** such as IV ½ NS are typically used later in DKA/HHS management, once the patient's **hemodynamic stability** has been achieved and serum sodium levels are stable or elevated.
- Administering hypotonic fluids to an already **hypotensive and volume-depleted patient** could worsen hypotension and potentially lead to cerebral edema if not carefully monitored.
*IV insulin*
- While insulin is essential for correcting hyperglycemia, it is administered **after or concurrently with fluid resuscitation** to avoid worsening hypovolemia as it drives glucose and potassium into cells, potentially causing **hypokalemia** and further **hemoconcentration**.
- **Fluid resuscitation** should always precede or be initiated simultaneously with insulin therapy, especially in cases of hemodynamic instability.
*Subcutaneous insulin injection*
- **Subcutaneous insulin** is not appropriate for initial management in this critically ill patient due to its **slower onset of action** and potentially **erratic absorption** in hypotensive and poorly perfused states.
- **Intravenous insulin** is preferred in DKA/HHS for its rapid, titratable effect.
*IV D5W*
- **Dextrose 5% in water (D5W)** is a hypotonic solution primarily used when **blood glucose levels fall below 250 mg/dL** during DKA/HHS treatment to prevent hypoglycemia.
- Administering D5W in a patient with a **serum glucose of 500 mg/dL** would further elevate blood sugar and worsen the hyperosmolar state.
Mixed DKA/HHS management US Medical PG Question 2: A 19-year-old man with a history of type 1 diabetes presents to the emergency department for the evaluation of a blood glucose level of 492 mg/dL. Laboratory examination revealed a serum bicarbonate level of 13 mEq/L, serum sodium level of 122 mEq/L, and ketonuria. Arterial blood gas demonstrated a pH of 6.9. He is admitted to the hospital and given bicarbonate and then started on an insulin drip and intravenous fluid. Seven hours later when his nurse is making rounds, he is confused and complaining of a severe headache. Repeat sodium levels are unchanged, although his glucose level has improved. His vital signs include a temperature of 36.6°C (98.0°F), pulse 50/min, respiratory rate 13/min and irregular, and blood pressure 177/95 mm Hg. What other examination findings would be expected in this patient?
- A. Hypoglycemia
- B. Pupillary constriction
- C. Papilledema (Correct Answer)
- D. Pancreatitis
- E. Peripheral edema
Mixed DKA/HHS management Explanation: ***Papilledema***
- This patient's symptoms (confusion, severe headache, bradycardia, irregular respiration, hypertension) following treatment for **diabetic ketoacidosis (DKA)** are highly suggestive of **cerebral edema**.
- **Papilledema** is a retinal finding resulting from increased intracranial pressure (ICP), which is a characteristic sign of cerebral edema.
*Hypoglycemia*
- While the patient's glucose level has improved, it is not described as being low enough to cause hypoglycemia, and the symptoms are more consistent with **increased ICP**.
- Symptoms of hypoglycemia (e.g., tremors, sweating, hunger, anxiety) are different from the patient's current presentation of confusion and severe headache.
*Pupillary constriction*
- **Pupillary constriction** (miosis) is typically not associated with cerebral edema; instead, **pupillary dilation** (mydriasis) can occur with severe increase in ICP due to uncal herniation.
- The combination of bradycardia, irregular respiration, and hypertension (Cushing's triad) is indicative of increased ICP, which would likely cause pupillary changes related to brainstem compression.
*Pancreatitis*
- Pancreatitis is a known complication of DKA, but it typically presents with **severe abdominal pain**, nausea, and vomiting, rather than cerebral symptoms.
- Although the patient had DKA, the current neurological symptoms point directly to an intracranial process rather than an abdominal issue.
*Peripheral edema*
- **Peripheral edema** results from fluid accumulation in peripheral tissues and is not a direct consequence or expected finding in cerebral edema.
- While fluid administration can cause some peripheral fluid retention, it typically does not lead to the acute neurological deterioration seen in this patient.
Mixed DKA/HHS management US Medical PG Question 3: A 16-year-old woman presents to the emergency department for evaluation of acute vomiting and abdominal pain. Onset was roughly 3 hours ago while she was sleeping. She has no known past medical history. Her family history is positive for hypothyroidism and diabetes mellitus in her maternal grandmother. On examination, she is found to have fruity breath and poor skin turgor. She appears fatigued and her consciousness is slightly altered. Laboratory results show a blood glucose level of 691 mg/dL, sodium of 125 mg/dL, and elevated serum ketones. Of the following, which is the next best step in patient management?
- A. Administer IV fluids and insulin (Correct Answer)
- B. Initiate basal-bolus insulin regimen
- C. Initiate insulin glargine 10 units at bedtime only
- D. Initiate oral antidiabetic medications
- E. Initiate insulin aspart at mealtimes only
Mixed DKA/HHS management Explanation: ***Administer IV fluids and insulin***
- The patient presents with **fruity breath**, **altered consciousness**, **hyperglycemia (691 mg/dL)**, **hyponatremia**, and **elevated serum ketones**, which are classic signs of **diabetic ketoacidosis (DKA)**.
- The immediate management for DKA involves aggressive **intravenous fluid resuscitation** to correct dehydration and hypovolemia, followed by a continuous **intravenous insulin infusion** to lower blood glucose and suppress ketogenesis.
*Initiate basal-bolus insulin regimen*
- A **basal-bolus insulin regimen** is appropriate for long-term management of diabetes but is not the immediate treatment for acute DKA, which requires continuous intravenous insulin.
- This approach does not address the severe dehydration and electrolyte imbalances seen in DKA, which need urgent fluid replacement.
*Initiate insulin glargine 10 units at bedtime only*
- **Insulin glargine** is a long-acting insulin used for basal insulin coverage, typically in the chronic management of diabetes.
- This dose is insufficient to manage acute DKA, and it also fails to address the critical need for fluid resuscitation.
*Initiate oral antidiabetic medications*
- **Oral antidiabetic medications** are suitable for individuals with type 2 diabetes or milder forms of insulin resistance, not for acute DKA.
- They are ineffective in severe hyperglycemia and metabolic acidosis characteristic of DKA, and do not address dehydration.
*Initiate insulin aspart at mealtimes only*
- **Insulin aspart** is a rapid-acting insulin used to cover mealtime glucose excursions.
- Administering it only at mealtimes is inadequate for acute DKA, which requires continuous insulin infusion and aggressive fluid management.
Mixed DKA/HHS management US Medical PG Question 4: A 14-year-old boy is admitted to the emergency department with acute onset of confusion, malaise, diffuse abdominal pain, nausea, and a single episode of vomiting. He denies ingestion of any suspicious foods, fevers, respiratory symptoms, or any other symptoms preceding his current condition. However, he notes an increase in his liquid consumption and urinary frequency over the last 6 months. On physical examination, he is responsive but somnolent. His blood pressure is 90/50 mm Hg, heart rate is 101/min, respiratory rate is 21/min, temperature is 36.0°C (96.8°F), and SpO2 is 96% on room air. He has facial pallor and dry skin and mucous membranes. His lungs are clear to auscultation, and heart sounds are normal. His abdomen is soft with no rebound tenderness on palpation. Neurological examination is significant for 1+ deep tendon reflexes in all extremities. A dipstick test shows 3+ for ketones and glucose. The patient’s blood tests show the following findings:
RBCs 4.1 million/mm3
Hb 13.7 mg/dL
Hematocrit 56%
Leukocyte count 7,800/mm3
Platelet count 321,000/mm3
Glucose 565 mg/dL
Potassium 5.8 mEq/L
Sodium 136 mEq/L
ALT 15 U/L
AST 17 U/L
Amylase 88 U/L
Bicarbonate 19 mEq/L
BE −3 mEq/L
pH 7.3
pCO2 37 mm Hg
pO2 66 mm Hg
Which of the medications listed below should be administered to the patient intravenously?
- A. Insulin detemir
- B. Regular insulin (Correct Answer)
- C. Cefazolin
- D. Potassium chloride
- E. Isophane insulin
Mixed DKA/HHS management Explanation: **Regular insulin**
- The patient presents with **diabetic ketoacidosis (DKA)**, characterized by **hyperglycemia** (glucose 565 mg/dL), **ketonuria** (ketones 3+), and **metabolic acidosis** (pH 7.3, bicarbonate 19 mEq/L, BE -3 mEq/L). **Intravenous regular insulin** is the cornerstone of DKA treatment to lower blood glucose and resolve ketosis.
- Regular insulin is the only type of insulin that can be administered intravenously and has a **rapid onset** and **short duration of action**, allowing for precise titration and quick correction of severe hyperglycemia and acidosis.
*Insulin detemir*
- **Insulin detemir** is a **long-acting insulin analog** primarily used for basal insulin replacement, not for acute management of severe hyperglycemia or DKA.
- It has a **slow onset of action** (1-2 hours) and a prolonged duration (up to 24 hours), making it unsuitable for the urgent and rapid correction required in DKA.
*Cefazolin*
- **Cefazolin** is a **first-generation cephalosporin antibiotic** used to treat bacterial infections.
- This patient's symptoms are consistent with DKA, not a bacterial infection, and there is no indication for antibiotic therapy.
*Potassium chloride*
- Despite the patient's **hyperkalemia** (potassium 5.8 mEq/L) at presentation, DKA treatment with insulin will shift potassium intracellularly, leading to **hypokalemia**.
- **Potassium chloride** is typically added to IV fluids **after insulin therapy has begun and potassium levels start to drop**, to prevent severe hypokalemia, not as an initial treatment when levels are already high.
*Isophane insulin*
- **Isophane insulin (NPH)** is an **intermediate-acting insulin** that is administered subcutaneously.
- It has a **delayed onset of action** (2-4 hours) and cannot be given intravenously, making it inappropriate for the acute management of DKA.
Mixed DKA/HHS management US Medical PG Question 5: A 48-year-old man presents with DKA. Initial treatment is initiated with fluids and insulin infusion. Labs show glucose 460 mg/dL, pH 7.18, bicarbonate 10 mEq/L, potassium 4.5 mEq/L, and creatinine 2.8 mg/dL (baseline 1.0). After 4 hours, glucose decreases to 380 mg/dL but pH worsens to 7.12, bicarbonate drops to 8 mEq/L, and lactate is 5.2 mmol/L (initially 1.8). Blood pressure is 85/50 mmHg. Evaluate the clinical situation and necessary intervention.
- A. Administer additional fluid bolus for persistent hypotension
- B. Evaluate for sepsis or other concurrent illness causing lactic acidosis (Correct Answer)
- C. Increase insulin infusion rate to accelerate ketone clearance
- D. Add bicarbonate therapy for worsening acidosis
- E. Continue current management as DKA takes time to resolve
Mixed DKA/HHS management Explanation: ***Evaluate for sepsis or other concurrent illness causing lactic acidosis***
- While the blood glucose is responding to insulin, the **worsening metabolic acidosis** and significantly elevated **lactate (5.2 mmol/L)** indicate a secondary process such as **sepsis** or tissue hypoperfusion.
- **Diabetic Ketoacidosis (DKA)** often has a precipitating factor; the combination of **hypotension** and rising lactate suggests **septic shock** or organic ischemia that requires urgent investigation and targeted treatment.
*Administer additional fluid bolus for persistent hypotension*
- Although fluid resuscitation is vital, simply giving more fluids without diagnosing the **underlying cause** of the rising lactate and refractory shock is insufficient.
- **Hypotension** in this context may be secondary to **septic shock** or systemic inflammatory response rather than simple volume depletion from DKA.
*Increase insulin infusion rate to accelerate ketone clearance*
- The current insulin infusion is successfully lowering the blood glucose, but the acidosis is worsening due to **lactic acid**, not just ketones.
- Increasing insulin will not resolve **Type A lactic acidosis** caused by **inadequate tissue oxygenation** or sepsis.
*Add bicarbonate therapy for worsening acidosis*
- **Bicarbonate therapy** is generally not recommended in DKA unless the pH is <6.9, as it can cause **paradoxical cerebral acidosis** and hypokalemia.
- Administering bicarbonate would provide a temporary buffer but would fail to address the **rising lactate** and underlying hemodynamic instability.
*Continue current management as DKA takes time to resolve*
- While DKA resolution is gradual, a **rising lactate** and **falling pH** despite therapy are red flags that indicate the clinical condition is deteriorating.
- Ignoring the **acute kidney injury** (Creatinine 2.8) and persistent **hypotension** increases the risk of multi-organ failure and mortality.
Mixed DKA/HHS management US Medical PG Question 6: A 25-year-old woman with type 1 diabetes presents with DKA. She admits to intentionally withholding insulin to lose weight. This is her fifth DKA admission in 8 months. Current pH is 7.14, glucose 520 mg/dL, bicarbonate 11 mEq/L. Medical costs exceed $150,000 for recurrent admissions. The team is frustrated. Evaluate the comprehensive management approach beyond acute DKA treatment.
- A. Referral to ethics committee for discussion of resource allocation
- B. Involuntary psychiatric commitment for non-compliance
- C. Insulin pump placement to prevent future manipulation
- D. Multidisciplinary approach including psychiatry, eating disorder specialist, diabetes educator, and close outpatient follow-up (Correct Answer)
- E. Standard DKA treatment with discharge to outpatient endocrinology
Mixed DKA/HHS management Explanation: ***Multidisciplinary approach including psychiatry, eating disorder specialist, diabetes educator, and close outpatient follow-up***
- This patient presents with **diabulimia**, a life-threatening eating disorder where Type 1 diabetics restrict insulin for weight control, requiring a **comprehensive care team** to address both physiologic and psychological needs.
- A **multidisciplinary strategy** is essential to reduce the high risk of mortality and frequent **recurrent DKA admissions** by targeting the root cause of non-compliance.
*Referral to ethics committee for discussion of resource allocation*
- While medical costs are high, **withholding treatment** based on cost or resource allocation for a life-threatening condition like DKA is generally unethical.
- The **ethics committee** may assist in complex care plans, but it does not address the primary clinical need for specialized psychiatric and nutritional intervention.
*Involuntary psychiatric commitment for non-compliance*
- **Involuntary commitment** typically requires the patient to be a danger to themselves or others due to a mental illness; insulin omission, while dangerous, often does not meet legal criteria if the patient has **decision-making capacity**.
- Simple **non-compliance** in an adult with capacity is not usually grounds for commitment, and long-term behavioral change is better achieved through voluntary therapeutic engagement.
*Insulin pump placement to prevent future manipulation*
- An **insulin pump** is not a solution as it can still be easily manipulated, disconnected, or the settings altered by a patient determined to restrict insulin.
- Introducing a medical device without addressing the **underlying eating disorder** may actually complicate management and increase the risk of device-related complications.
*Standard DKA treatment with discharge to outpatient endocrinology*
- Given five DKA admissions in 8 months, standard management has already proven **insufficient** and fails to address the unique psychiatric etiology of her condition.
- Discharging to **standard outpatient endocrinology** without specialized eating disorder support ignores the behavioral triggers that lead to recurrent life-threatening metabolic crises.
Mixed DKA/HHS management US Medical PG Question 7: A 55-year-old man with type 2 diabetes and end-stage renal disease on hemodialysis presents with DKA. Initial glucose is 580 mg/dL, pH 7.12, bicarbonate 10 mEq/L, and potassium 6.2 mEq/L. He is fluid overloaded with bilateral crackles and peripheral edema. His last dialysis was 3 days ago. Evaluate the optimal management strategy addressing both DKA and renal failure.
- A. Standard DKA protocol with furosemide for fluid management
- B. Bicarbonate therapy to correct acidosis without fluids
- C. Subcutaneous insulin with no IV fluids due to volume overload
- D. Insulin infusion with limited fluids and urgent hemodialysis (Correct Answer)
- E. Standard DKA protocol with aggressive fluid resuscitation
Mixed DKA/HHS management Explanation: ***Insulin infusion with limited fluids and urgent hemodialysis***
- Patients with **ESRD** and **DKA** who are **fluid overloaded** require **urgent hemodialysis** to safely correct metabolic acidosis, hyperkalemia, and volume status.
- **Continuous insulin infusion** is essential to stop ketone production, but fluid resuscitation must be severely **restricted** to avoid worsening pulmonary edema.
*Standard DKA protocol with furosemide for fluid management*
- **Furosemide** is ineffective in patients with **end-stage renal disease** (ESRD) as they have minimal to no residual renal function.
- Standard DKA protocols prioritize aggressive IV fluids, which would be **life-threatening** for a patient already showing signs of volume overload and crackles.
*Bicarbonate therapy to correct acidosis without fluids*
- **Bicarbonate therapy** is generally not recommended for DKA unless the pH is below 6.9, and it can cause a **rebound worsening** of intracellular acidosis.
- It does not address the underlying **insulin deficiency** or the patient's massive **volume overload** and hyperkalemia.
*Subcutaneous insulin with no IV fluids due to volume overload*
- **Subcutaneous insulin** is inappropriate for severe DKA (pH 7.12); **intravenous insulin** is the standard for rapid titration and metabolic control.
- Complete avoidance of fluids may prevent correction of the **osmotic shift**, but the primary failure here is the omission of dialysis for a symptomatic ESRD patient.
*Standard DKA protocol with aggressive fluid resuscitation*
- Aggressive fluid administration is **contraindicated** in ESRD patients with clinical signs of **congestive heart failure** like crackles and peripheral edema.
- This approach carries a high risk of inducing **acute respiratory failure** or flash pulmonary edema.
Mixed DKA/HHS management US Medical PG Question 8: A 38-year-old pregnant woman at 28 weeks gestation with type 1 diabetes presents with nausea and vomiting. Labs show glucose 310 mg/dL, pH 7.27, bicarbonate 15 mEq/L, and positive urine ketones. Fetal monitoring shows reactive non-stress test. She has been taking her insulin but unable to eat for 24 hours due to hyperemesis. Analyze the optimal management approach considering maternal and fetal risks.
- A. Standard DKA protocol with standard glucose targets (200-250 mg/dL)
- B. Aggressive DKA treatment with lower glucose targets (100-150 mg/dL) and close fetal monitoring (Correct Answer)
- C. Immediate cesarean delivery followed by DKA treatment
- D. Conservative management with oral intake and subcutaneous insulin
- E. Standard DKA protocol with delivery planning after stabilization
Mixed DKA/HHS management Explanation: ***Aggressive DKA treatment with lower glucose targets (100-150 mg/dL) and close fetal monitoring***
- In pregnancy, **Diabetic Ketoacidosis (DKA)** often presents with lower blood glucose levels due to increased **glucose utilization** by the fetus and placenta.
- Successful management requires **aggressive hydration**, **intravenous insulin**, and maintaining blood glucose between **100-150 mg/dL** to prevent fetal complications.
*Standard DKA protocol with standard glucose targets (200-250 mg/dL)*
- Standard targets for non-pregnant adults are too high for pregnancy and can lead to prolonged **fetal acidosis** and increased morbidity.
- Pregnancy-specific protocols prioritize tighter glycemic control to optimize the **maternal-fetal environment** during acute metabolic distress.
*Immediate cesarean delivery followed by DKA treatment*
- Surgery during **untreated DKA** carries extremely high maternal and fetal risk; the fetus should only be delivered for **obstetric indications** after maternal stabilization.
- **Fetal heart rate** abnormalities often resolve once the mother's **acidosis** and electrolyte imbalances are corrected with medical therapy.
*Conservative management with oral intake and subcutaneous insulin*
- Maternal **acidemia (pH 7.27)** and **ketonuria** indicate a medical emergency that cannot be safely managed with subcutaneous insulin or oral fluids.
- **Nausea and vomiting** from hyperemesis or the DKA itself necessitate **intravenous fluid resuscitation** and specialized inpatient monitoring.
*Standard DKA protocol with delivery planning after stabilization*
- While maternal stabilization is the primary goal, following a "standard" protocol ignores the need for **lower glucose targets** unique to pregnancy.
- **Delivery planning** at 28 weeks should only be considered if fetal distress persists after maternal metabolic status has returned to baseline.
Mixed DKA/HHS management US Medical PG Question 9: A 42-year-old man with type 1 diabetes on insulin pump presents with DKA after pump malfunction. He is admitted and started on IV insulin infusion. After 14 hours of treatment, his glucose is 210 mg/dL on D5-0.45% saline, pH 7.36, bicarbonate 19 mEq/L, and anion gap 12. He is alert, eating, and requesting to go home. Evaluate the appropriate transition strategy.
- A. Switch to subcutaneous insulin and discharge immediately
- B. Stop IV insulin immediately and restart insulin pump at home
- C. Continue IV insulin for another 6 hours to ensure stability
- D. Give subcutaneous insulin, overlap for 1-2 hours, then stop IV insulin and observe (Correct Answer)
- E. Discontinue IV insulin, discharge with oral medications
Mixed DKA/HHS management Explanation: ***Give subcutaneous insulin, overlap for 1-2 hours, then stop IV insulin and observe***
- DKA is considered resolved when the **anion gap** is <12, **bicarbonate** is ≥18, and **pH** >7.3; once resolved, transitioning to **subcutaneous insulin** is appropriate if the patient is eating.
- An **overlap period of 1-2 hours** between the administration of subcutaneous insulin and the cessation of the **IV insulin infusion** is mandatory to prevent the recurrence of ketoacidosis due to the short half-life of IV insulin.
*Switch to subcutaneous insulin and discharge immediately*
- While the transition to subcutaneous insulin is correct, **immediate discharge** is unsafe as the patient must be observed for metabolic stability after the transition.
- Adequate time must be allowed for **absorption of subcutaneous insulin** and verification that the patient can maintain glycemic control while off the infusion.
*Stop IV insulin immediately and restart insulin pump at home*
- Stopping IV insulin **immediately** without an overlap period leads to a rapid decline in serum insulin levels and risks a **rebound of ketosis**.
- Relying on the patient to restart a potentially **malfunctioning pump** at home without inpatient supervision increases the risk of treatment failure.
*Continue IV insulin for another 6 hours to ensure stability*
- **Prolonging IV insulin** after the resolution of DKA and normalization of the anion gap is unnecessary and increases the risk of **hypoglycemia** and **hypokalemia**.
- Since the patient is alert and **eating**, they meet the criteria for transitioning to a subcutaneous regimen to facilitate a return to normal metabolic management.
*Discontinue IV insulin, discharge with oral medications*
- **Type 1 diabetic** patients have an absolute insulin deficiency and always require exogenous insulin; **oral medications** are inappropriate for managing T1DM.
- Discontinuing insulin therapy in a T1DM patient will inevitably lead to the return of **hyperglycemia** and life-threatening **diabetic ketoacidosis**.
Mixed DKA/HHS management US Medical PG Question 10: A 52-year-old woman with type 2 diabetes is admitted for DKA. Initial pH is 7.08, bicarbonate 8 mEq/L, and anion gap 28. She is started on standard DKA protocol. After 10 hours of treatment, her glucose is 180 mg/dL, pH is 7.28, bicarbonate is 14 mEq/L, but anion gap remains elevated at 22. Chloride is 115 mEq/L (elevated). Analyze the acid-base status.
- A. Renal tubular acidosis unmasked by treatment
- B. Mixed anion gap and non-anion gap acidosis (Correct Answer)
- C. Persistent DKA requiring increased insulin rate
- D. Non-anion gap metabolic acidosis from excessive saline administration
- E. Resolving DKA with appropriate response to treatment
Mixed DKA/HHS management Explanation: ***Mixed anion gap and non-anion gap acidosis***
- The patient exhibits a **persistently elevated anion gap** (22) from incomplete clearance of ketones and a **hyperchloremic non-anion gap metabolic acidosis (NAGMA)** due to aggressive saline administration.
- The rise in **chloride to 115 mEq/L** alongside a low bicarbonate level while the pH is still acidic confirms that two distinct metabolic processes are contributing to the acidemia.
*Renal tubular acidosis unmasked by treatment*
- While **RTA** causes a non-anion gap acidosis, it is a clinical diagnosis usually associated with specific chronic electrolyte patterns or systemic diseases, not acute resuscitation settings.
- The acidosis here is better explained by the **iatrogenic chloride load** from normal saline used in standard DKA protocols.
*Persistent DKA requiring increased insulin rate*
- Although the anion gap is still elevated, the **blood glucose has significantly dropped** (180 mg/dL) and the **pH is rising**, indicating that the insulin is effectively clearing ketones.
- Increasing the insulin rate solely based on the anion gap without considering the **hyperchloremic component** could lead to hypoglycemia.
*Non-anion gap metabolic acidosis from excessive saline administration*
- While hyperchloremic NAGMA is present, this option is incomplete because it ignores the **persistent anion gap of 22**, which indicates remaining ketoacids.
- A pure NAGMA would have a **normal anion gap** (typically 8–12), which is not the case here.
*Resolving DKA with appropriate response to treatment*
- This describes the clinical trend but fails to **analyze the acid-base status** accurately as requested by the question.
- It does not account for the **elevated chloride**, which represents a secondary acid-base distraction from a simple resolving DKA profile.
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