11.1 Diabetic Ketoacidosis (DKA), Maternal Hypoglycemia & Endocrine Resuscitation in Pregnancy

Q: A 26-year-old G2P1 with Type 1 diabetes at 30 weeks of gestation presents to the obstetric emergency department with a 24-hour history of intractable nausea, vomiting, and generalized weakness following the onset of viral gastroenteritis. Fingerstick blood glucose is 182 mg/dL. Maternal vital signs are: blood pressure 98/58 mmHg, pulse 116 bpm, respiratory rate 28 breaths/min with deep Kussmaul breathing, and SpO2 98% on room air. Laboratory evaluation reveals: venous pH 7.21, serum bicarbonate 11 mEq/L, sodium 132 mEq/L, chloride 96 mEq/L, potassium 4.2 mEq/L, and serum beta-hydroxybutyrate 6.2 mmol/L. Continuous electronic fetal monitoring shows a baseline fetal heart rate of 165 bpm, minimal baseline variability, and repetitive shallow late decelerations with uterine contractions. Which of the following is the most appropriate next step in management?

Initiate rapid intravenous volume resuscitation with 0.9% normal saline, start continuous intravenous regular insulin at 0.1 units/kg/h with potassium supplementation, and maintain in utero fetal resuscitation while avoiding emergent delivery.. The patient is presenting with euglycemic diabetic ketoacidosis (DKA) in pregnancy, evidenced by high-anion-gap metabolic acidosis (anion gap = 25 mEq/L), elevated serum beta-hydroxybutyrate (6.2 mmol/L), severe bicarbonate depletion (11 mEq/L), and Kussmaul respirations despite a blood glucose of only 182 mg/dL. The immediate management priority is aggressive maternal intravenous crystalloid resuscitation (1–2 L normal saline in the first hour), continuous intravenous regular insulin infusion (0.1 units/kg/h), and potassium repletion. Emergency operative delivery is strictly contraindicated during acute maternal acidemia because maternal and fetal mortality are extraordinarily high under surgical and anesthetic stress; the non-reassuring fetal heart rate pattern reflects maternal acidemia and hypoperfusion and will reliably resolve as maternal volume and biochemical parameters are corrected in utero.

Q: A 29-year-old G1P0 at 32 weeks of gestation with pregestational Type 1 diabetes is being treated in the intensive care unit for diabetic ketoacidosis. Initial blood glucose was 380 mg/dL, pH was 7.18, and serum bicarbonate was 9 mEq/L. After receiving 3 liters of normal saline and 4 hours of continuous IV regular insulin infusion at 0.1 units/kg/h, her blood glucose has decreased to 195 mg/dL. Her repeat venous pH is 7.26, serum bicarbonate is 14 mEq/L, and anion gap is 16 mEq/L. Which of the following is the most appropriate next step regarding fluid and insulin management?

Add 5% dextrose in 0.45% normal saline to the IV fluids while continuing the intravenous regular insulin infusion at a titrated rate of 0.05 to 0.1 units/kg/h until the anion gap closes.. When blood glucose drops below 200 to 250 mg/dL during DKA resuscitation in pregnancy, 5% dextrose must be added to the intravenous fluids (D5W in 0.45% NaCl) while CONTINUING the regular insulin infusion at 0.05 to 0.1 units/kg/h. Discontinuing insulin when glucose normalizes is a catastrophic error because insulin is required to halt hepatic lipolysis, suppress ketogenesis, and close the elevated anion gap. Administering dextrose provides the necessary substrate to prevent hypoglycemia while allowing ongoing insulin therapy to clear ketoacids.

Q: A 31-year-old G2P1 at 28 weeks of gestation with known Graves disease presents to the labor and delivery triage unit in acute distress. She reports fever, palpitations, nausea, diarrhea, and severe anxiety. On examination, temperature is 39.2°C (102.6°F), blood pressure is 154/78 mmHg, pulse is 152 bpm with irregular rhythm (atrial fibrillation), and she is delirious. Her Burch-Wartofsky Point Scale score is 60. The team diagnoses thyroid storm. In what specific sequence should the primary pharmacological agents be administered?

Propylthiouracil (PTU) loading dose, followed at least 1 hour later by inorganic iodine (SSKI or Lugol's solution), intravenous propranolol, and intravenous dexamethasone.. The definitive multimodality pharmacotherapy for thyroid storm in pregnancy requires administering a thionamide (Propylthiouracil 600–800 mg PO loading dose) FIRST to block new thyroid hormone synthesis and inhibit peripheral T4-to-T3 conversion. Inorganic iodine (SSKI or Lugol's solution) must be administered AT LEAST 1 HOUR AFTER the thionamide; administering iodine prior to thionamide provides substrate for new hormone synthesis (Jod-Basedow phenomenon), worsening the storm. Beta-blockers (propranolol or esmolol) control hyperadrenergic symptoms, and corticosteroids (dexamethasone) block peripheral conversion and treat adrenal insufficiency. Aspirin is strictly contraindicated because it displaces thyroid hormones from thyroid-binding globulin, increasing free T4/T3.

Q: A 22-year-old G1P0 at 26 weeks of gestation with Type 1 diabetes presents in moderate diabetic ketoacidosis. Point-of-care capillary glucose is 340 mg/dL. The initial basic metabolic panel reveals: sodium 134 mEq/L, potassium 3.0 mEq/L, chloride 100 mEq/L, and bicarbonate 12 mEq/L. Which of the following is the most appropriate initial management step regarding insulin and electrolyte therapy?

Hold the initiation of insulin therapy and administer intravenous potassium chloride at 20 to 30 mEq/h until the serum potassium rises above 3.3 mEq/L.. If baseline serum potassium is 3.3 mEq/L. Insulin drives potassium rapidly into cells via activation of the sodium-potassium ATPase pump; administering insulin in the setting of preexisting severe hypokalemia triggers catastrophic, fatal cardiac arrhythmias (ventricular fibrillation, asystole) and acute respiratory muscle paralysis. Once potassium rises above 3.3 mEq/L, insulin infusion can be safely started alongside continued potassium maintenance to maintain levels strictly between 4.0 and 5.0 mEq/L.

Q: A 31-year-old G2P2 with type 1 diabetes managed on 62 units of insulin daily throughout the third trimester delivers a healthy term infant vaginally at 09:15. Her insulin orders are continued unchanged after delivery. At 12:40 the nurse finds her diaphoretic, confused, and unable to follow commands. Point-of-care glucose is 38 mg/dL and intravenous access is patent. What is the correct immediate action and the underlying explanation?

Administer 25 grams of 50% dextrose intravenously and reduce her insulin dose, because delivery of the placenta abruptly removes human placental lactogen, progesterone, and cortisol and cuts insulin requirements by roughly half or more within minutes.. This is Level 3 severe hypoglycemia: the patient has altered mental status and cannot protect her airway or take anything by mouth, so intravenous 50% dextrose is the correct route and oral carbohydrate is unsafe. The mechanism is the postpartum insulin cliff — placental delivery abruptly withdraws the diabetogenic hormones that produced insulin resistance, so requirements fall by approximately half or more immediately, and the late-pregnancy dose must be reduced pre-emptively at delivery rather than continued unchanged. Insulin requirements fall rather than rise after delivery. Attributing the confusion to eclampsia without first checking a glucose is the classic anchoring error, and here the glucose has already identified the cause.

Key Takeaways

Pregnancy is a state of accelerated ketosis driven by human placental lactogen (hPL), progesterone, and cortisol; diabetic ketoacidosis (DKA) can develop rapidly at markedly lower serum glucose thresholds, frequently presenting as euglycemic DKA with blood glucose between 150 and 250 mg/dL (or <200 mg/dL).
DKA in pregnancy carries a high fetal mortality rate of 10% to 25% due to severe transplacental acidosis, maternal osmotic hypovolemia, hypoperfusion, and electrolyte shifts; non-reassuring fetal heart rate patterns (late decelerations, minimal variability) are common during acute maternal acidemia and reliably resolve with maternal resuscitation.
Emergency delivery is strictly contraindicated during acute maternal ketoacidosis; maternal resuscitation with aggressive IV crystalloids (1–2 L normal saline in hour 1, then 250–500 mL/h), continuous regular insulin infusion (0.1 unit/kg/h), potassium repletion once K <5.3 mEq/L, and adding D5W when glucose reaches <200–250 mg/dL must precede any delivery considerations.
Thyroid storm in pregnancy is a hypermetabolic life-threatening crisis diagnosed using the Burch-Wartofsky Point Scale (score ≥45); pharmacotherapy requires a strict sequence of propylthiouracil (PTU), followed at least 1 hour later by saturated solution of potassium iodide (SSKI) or Lugol's solution, alongside IV beta-blockade (propranolol/esmolol) and IV dexamethasone.
Insulin requirements fall by approximately half or more the moment the placenta is delivered as human placental lactogen, progesterone, and cortisol are withdrawn, so insulin must be reduced pre-emptively at delivery; severe maternal hypoglycemia (altered mental status or need for third-party assistance) is treated with 25 g of 50% dextrose intravenously or glucagon 1 mg intramuscularly when there is no access, and because it mimics eclampsia, stroke, and magnesium toxicity a point-of-care glucose is mandatory in every obstetric patient with a seizure or altered mental status.

Last updated: August 2026

Diabetic Ketoacidosis (DKA) in Pregnancy: Euglycemic DKA & Resuscitation

Diabetic Ketoacidosis (DKA) in pregnancy is an acute, life-threatening metabolic emergency characterized by the triad of hyperglycemia (or relative euglycemia), hyperketonemia, and high-anion-gap metabolic acidosis. While DKA complicates approximately 1% to 3% of pregnancies affected by pregestational Type 1 diabetes, it can also occur in Type 2 and gestational diabetes mellitus (GDM). Maternal mortality from DKA has decreased to <1% in modern critical care units, but fetal mortality remains alarmingly high at 10% to 25% per episode. Immediate recognition, physiologic stabilization, and avoidance of premature operative delivery during acute acidemia are essential.

1. Pathophysiology of Accelerated Ketosis in Pregnancy

Pregnancy is a state of profound physiologic insulin resistance coupled with enhanced lipolysis, creating what is classically described as "accelerated starvation" and "accelerated ketosis."

+---------------------------------------------------------------------------------------------------+
|                    METABOLIC ALTERATIONS DRIVING ACCELERATED KETOSIS                              |
|                                                                                                   |
|  1. PLACENTAL CONTRA-INSULIN HORMONES:                                                            |
|     • Human Placental Lactogen (hPL), Placental Growth Hormone, Progesterone, Cortisol, and       |
|       Prolactin rise progressively across gestation, inducing peripheral insulin resistance.       |
|     • Hepatic gluconeogenesis and glycogenolysis increase while peripheral glucose uptake declines.|
|                                                                                                   |
|  2. ACCELERATED LIPOLYSIS & KETOGENESIS:                                                          |
|     • Fasting states trigger rapid hydrolysis of maternal triglycerides into Free Fatty Acids.   |
|     • Carnitine Palmitoyltransferase-1 (CPT-1) shuttles fatty acids into hepatic mitochondria.    |
|     • Beta-oxidation generates massive excess of Acetoacetate and Beta-Hydroxybutyrate (BOHB).    |
|                                                                                                   |
|  3. DIMINISHED BUFFERING CAPACITY:                                                                |
|     • Progesterone-driven central hyperventilation produces chronic respiratory alkalosis.         |
|     • Compensatory renal bicarbonate excretion reduces baseline serum [HCO3-] to 18–22 mEq/L      |
|       (normal arterial PaCO2 is 28–32 mmHg).                                                      |
|     • A minor acid load rapidly exhausts maternal buffering reserves, precipitating profound      |
|       metabolic acidosis much earlier than in non-pregnant patients.                              |
|                                                                                                   |
|  4. INCREASED GLOMERULAR FILTRATION RATE (GFR):                                                   |
|     • High GFR and lowered renal tubular threshold for glucose cause pronounced glucosuria.       |
|     • Lower serum glucose levels are maintained even in the presence of severe absolute or        |
|       relative insulin deficiency, promoting euglycemic DKA.                                      |
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2. Euglycemic DKA: Diagnostic Criteria & Pitfalls

In non-pregnant patients, DKA typically presents with marked hyperglycemia (blood glucose >250 to >600 mg/dL). In pregnancy, up to 30% to 50% of DKA cases present as "Euglycemic DKA", defined as severe ketoacidosis occurring with blood glucose levels <250 mg/dL, and frequently <200 mg/dL.

Clinical Triggers for Euglycemic DKA

Hyperemesis Gravidarum / Prolonged Fasting: Inability to maintain caloric intake leads to starvation ketosis combined with omitted insulin doses.
Infection / Sepsis: Acute pyelonephritis, chorioamnionitis, pneumonia, or viral gastroenteritis.
Antenatal Corticosteroids: Betamethasone or dexamethasone administration for fetal lung maturity triggers an acute surge in hepatic glucose output and peripheral insulin resistance.
Beta-Sympathomimetic Tocolytics: Terbutaline enhances hepatic glycogenolysis and lipolysis.
Sodium-Glucose Cotransporter-2 (SGLT2) Inhibitors: SGLT2 inhibitors cause heavy renal glucosuria, low insulin secretion, and uninhibited lipolysis (strictly contraindicated in pregnancy, but cases occur in inadvertent early pregnancy exposure).
Insulin Pump Malfunction / Non-Adherence: Subcutaneous infusion site failure or catheter disconnection.

Diagnostic Laboratory Criteria

Laboratory Parameter	Normal Pregnancy Value	Mild DKA in Pregnancy	Moderate-to-Severe DKA
Arterial / Venous pH	7.40 – 7.45	7.25 – 7.30	< 7.25 (Severe: < 7.00)
Serum Bicarbonate (HCO3-)	18 – 22 mEq/L	15 – 18 mEq/L	< 15 mEq/L (Severe: < 10)
Serum Beta-Hydroxybutyrate	< 0.5 mmol/L	3.0 – 5.0 mmol/L	> 5.0 mmol/L
Serum Glucose	70 – 95 mg/dL (fasting)	150 – 250 mg/dL (Euglycemic)	> 250 mg/dL
Anion Gap [Na - (Cl + HCO3)]	6 – 10 mEq/L	12 – 16 mEq/L	> 16 mEq/L
Effective Osmolality	275 – 285 mOsm/kg	285 – 300 mOsm/kg	> 300 mOsm/kg

Clinical Diagnostic Pearl: Urine dipstick tests detect acetoacetate via the nitroprusside reaction, but do NOT detect beta-hydroxybutyrate, which is the predominant circulating ketoacid in severe DKA (often at an 8:1 ratio over acetoacetate). Always measure quantitative serum beta-hydroxybutyrate and calculate the serum anion gap when evaluating a pregnant diabetic with nausea, vomiting, or tachypnea, regardless of normal capillary blood glucose.

3. Step-by-Step Resuscitation Protocol for Maternal DKA

The management of DKA in pregnancy requires aggressive crystalloid rehydration, continuous IV regular insulin infusion, careful potassium management, and prompt addition of dextrose once glucose falls below 200–250 mg/dL to clear ketonemia.

+---------------------------------------------------------------------------------------------------+
|                         STEP-BY-STEP DKA RESUSCITATION PROTOCOL                                   |
|                                                                                                   |
|  STEP 1: AGGRESSIVE INTRAVENOUS CRYSTALLOID VOLUME EXPANSION                                      |
|  • Typical total fluid deficit is 4 to 6 Liters.                                                  |
|  • Hour 1: Infuse **1,000 to 2,000 mL of 0.9% Normal Saline (0.9% NaCl)** over 1 hour.            |
|  • Hours 2–4: Infuse 0.9% NaCl or 0.45% NaCl at **250 to 500 mL/hour** based on corrected sodium. |
|    - Corrected Serum Sodium = Measured Na + 0.016 * (Glucose - 100).                              |
|    - If corrected Na is normal or elevated (>135 mEq/L) -> Switch to 0.45% NaCl.                 |
|    - If corrected Na is low (<135 mEq/L) -> Continue 0.9% NaCl.                                   |
|                                                                                                   |
|  STEP 2: CONTINUOUS INTRAVENOUS REGULAR INSULIN INFUSION                                          |
|  • Check serum potassium BEFORE initiating insulin! (See Step 3).                                 |
|  • Administer **Continuous IV Regular Insulin at 0.1 units/kg/hour** (or 0.14 U/kg/h without      |
|    bolus, or IV bolus 0.1 U/kg followed by 0.1 U/kg/h).                                           |
|  • Target rate of glucose reduction: **50 to 75 mg/dL per hour**.                                 |
|  • If glucose does not drop by 50 mg/dL in the first 2 hours, double the insulin infusion rate.   |
|  • NEVER administer intermittent subcutaneous insulin during acute DKA due to erratic absorption.|
|                                                                                                   |
|  STEP 3: POTASSIUM REPLETION ALGORITHM (CRITICAL STEP)                                            |
|  • Insulin drives potassium into cells, causing rapid, life-threatening hypokalemia.              |
|  • If Serum K < 3.3 mEq/L: **HOLD INSULIN**; infuse KCl 20–40 mEq/h IV until K > 3.3 mEq/L.       |
|  • If Serum K 3.3 to 5.2 mEq/L: Start insulin AND add **20 to 30 mEq KCl per liter of IV fluid**   |
|    to maintain serum potassium strictly between 4.0 and 5.0 mEq/L.                                |
|  • If Serum K >= 5.3 mEq/L: Do not add potassium initially; re-check serum potassium every 2 hrs. |
|                                                                                                   |
|  STEP 4: ADDING DEXTROSE (THE EUGLYCEMIC DEXTROSE TRAP)                                           |
|  • When serum glucose falls to **< 200 to 250 mg/dL**:                                            |
|    - **ADD 5% DEXTROSE (D5W in 0.45% NaCl)** to the IV infusion at 150–250 mL/h.                 |
|    - **DO NOT STOP THE INSULIN INFUSION!** Reduce insulin rate to 0.05–0.1 units/kg/hour.         |
|    - Rationale: Insulin is required to shut down hepatic lipolysis and ketone production.         |
|      Dextrose provides the substrate necessary to continue insulin therapy safely without causing |
|      maternal hypoglycemia until the anion gap normalizes and ketoacidosis resolves.              |
|                                                                                                   |
|  STEP 5: RESOLUTION CRITERIA & TRANSITION TO SUBCUTANEOUS REGIMEN                                 |
|  • Criteria for DKA Resolution: Venous pH > 7.30, Serum HCO3 >= 18 mEq/L, Anion Gap <= 12 mEq/L,  |
|    and patient is alert and tolerating oral nutrition.                                            |
|  • Transition: Administer subcutaneous basal insulin (e.g., Glargine/Detemir/NPH) **2 hours      |
|    BEFORE discontinuing the intravenous insulin infusion** to prevent rebound ketoacidosis.       |
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Bicarbonate & Phosphate Therapy in Maternal DKA

Sodium Bicarbonate: Routine use is contraindicated because it worsens intracellular and fetal acidosis (paradoxical cerebral/placental acidosis via rapid CO2 diffusion across the blood-brain and placental barriers) and causes hypokalemia. Indicated ONLY for life-threatening maternal acidemia with arterial pH < 6.90 (100 mmol sodium bicarbonate in 400 mL sterile water with 20 mEq KCl over 2 hours until pH >= 7.00).
Phosphate Repletion: Serum phosphate shifts intracellularly with insulin. Replete with potassium phosphate only if serum phosphate drops < 1.0 mg/dL to prevent respiratory muscle weakness or rhabdomyolysis.

4. Fetal Physiology, Electronic Fetal Monitoring (EFM) & Delivery Rules

Impact of Maternal Ketoacidosis on the Fetus

Transplacental Acid Transfer: Ketoacids and hydrogen ions cross the placenta, causing fetal metabolic acidosis and severe myocardial depression.
Uteroplacental Hypoperfusion: Maternal osmotic diuresis and severe intravascular hypovolemia reduce uterine artery blood flow by up to 40% to 50%.
Leftward Shift of Maternal Oxyhemoglobin Curve (Alkalinization/2,3-DPG depletion): Severe acidemia followed by rapid shifts impairs oxygen unloading at the intervillous space.
Fetal Hyperinsulinemia & Hypoxia: High maternal glucose crossing the placenta stimulates fetal pancreatic beta-cells to secrete insulin, increasing fetal metabolic rate and oxygen consumption in the face of compromised placental delivery.

+---------------------------------------------------------------------------------------------------+
|                         CARDINAL RULE OF OBSTETRIC DKA MANAGEMENT                                 |
|                                                                                                   |
|  • NON-REASSURING EFM PATTERNS ARE EXPECTED:                                                      |
|    - Continuous EFM during active DKA frequently demonstrates fetal tachycardia, minimal or      |
|      absent baseline variability, and repetitive late decelerations.                              |
|                                                                                                   |
|  • ABSOLUTE CONTRAINDICATION TO IMMEDIATE OPERATIVE DELIVERY:                                     |
|    - **DO NOT PERFORM AN EMERGENCY CESAREAN DELIVERY FOR FHR ABNORMALITIES DURING ACTIVE DKA!**  |
|    - Maternal acidosis, dehydration, and electrolyte derangements make maternal surgical and      |
|      anesthetic mortality extraordinarily high.                                                   |
|    - The compromised fetus cannot tolerate delivery stress and suffers high neonatal mortality.   |
|    - Resuscitation of the mother *in utero* simultaneously resuscitates the fetus: as maternal   |
|      volume is restored and arterial pH normalizes, fetal heart rate variability and decelerations|
|      typically resolve within 4 to 12 hours.                                                      |
|                                                                                                   |
|  • INDICATIONS FOR DELIVERY:                                                                      |
|    - Delivery is deferred until the mother is fully resuscitated and metabolic acidosis resolved. |
|    - Emergency delivery is reserved only for catastrophic non-reassuring fetal status that        |
|      persists AFTER complete maternal hemodynamic and biochemical stabilization, or for           |
|      independent obstetric catastrophes (e.g., severe placental abruption).                       |
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5. Thyroid Storm in Pregnancy: Evaluation & Stepwise Pharmacotherapy

Thyroid storm is an extreme, life-threatening manifestation of thyrotoxicosis characterized by multiorgan decompensation. It carries a maternal mortality rate of 10% to 20% and is triggered by infection, labor, cesarean delivery, preeclampsia, or non-adherence to antithyroid medications.

Burch-Wartofsky Point Scale (BWPS)

The diagnosis of thyroid storm is clinical. The BWPS assigns points for:

Thermoregulatory Dysfunction: Temperature 99.0–99.9°F (5 pts) up to ≥104.0°F (30 pts).
Central Nervous System Effects: Mild agitation (10 pts), delirium/psychosis/lethargy (20 pts), coma/seizures (30 pts).
Gastrointestinal / Hepatic Dysfunction: Diarrhea, nausea, vomiting, abdominal pain (10 pts); unexplained jaundice (20 pts).
Cardiovascular Dysfunction: Tachycardia 100–109 bpm (5 pts) up to ≥140 bpm (25 pts); atrial fibrillation (10 pts); congestive heart failure (mild 5 pts to severe cardiogenic shock 15 pts).
Precipitating Event: Absent (0 pts), Present (10 pts).

Scoring: < 25 = Unlikely; 25–44 = Impending Storm; ≥ 45 = Highly Suggestive of Thyroid Storm.

Stepwise Multimodality Pharmacotherapy Protocol

+---------------------------------------------------------------------------------------------------+
|                         STEPWISE THYROID STORM TREATMENT REGIMEN                                  |
|                                                                                                   |
|  PILLAR 1: BLOCK NEW THYROID HORMONE SYNTHESIS (THIONAMIDES)                                      |
|  • **Propylthiouracil (PTU): 600 to 800 mg PO loading dose**, then **200 mg PO/NG every 4 hours**.|
|  • PTU is preferred over methimazole in thyroid storm because PTU inhibits both new hormone       |
|    synthesis AND the peripheral conversion of T4 to active T3.                                    |
|                                                                                                   |
|  PILLAR 2: INHIBIT PRE-FORMED THYROID HORMONE RELEASE (INORGANIC IODINE)                          |
|  • **Saturated Solution of Potassium Iodide (SSKI) 5 drops PO every 6 hours** OR                  |
|    **Lugol's Solution 8 drops PO every 6 hours** OR **Sodium Iodide 500 mg to 1 g IV every 12 h**.  |
|  • CRITICAL TIMING RULE: **GIVE IODINE AT LEAST 1 HOUR AFTER THE THIONAMIDE!**                    |
|    - Rationale: Administering iodine before blocking organification fuels new hormone synthesis   |
|      (Jod-Basedow phenomenon), worsening the storm. Giving it ≥1 hour after PTU induces the       |
|      Wolff-Chaikoff effect, blocking the release of pre-formed T4 and T3 from the thyroid gland.  |
|                                                                                                   |
|  PILLAR 3: ADRENERGIC BLOCKADE (BETA-BLOCKERS)                                                    |
|  • **Propranolol: 60 to 80 mg PO every 4 to 6 hours**, or **1 to 2 mg slow IV push every 15 min**.|
|  • Alternative: **Esmolol IV infusion** (500 mcg/kg load over 1 min, then 50–200 mcg/kg/min) in   |
|    ICU setting for rapid titration.                                                               |
|  • Controls severe tachycardia, diaphoresis, and tremors; high-dose propranolol also inhibits     |
|    peripheral T4-to-T3 monodeiodination.                                                          |
|                                                                                                   |
|  PILLAR 4: BLOCK PERIPHERAL T4-TO-T3 CONVERSION & ADRENAL SUPPORT (STEROIDS)                      |
|  • **Dexamethasone 2 mg IV every 6 hours** OR **Hydrocortisone 100 mg IV every 8 hours**.        |
|  • Inhibits peripheral T4-to-T3 conversion and treats potential relative adrenal insufficiency.   |
|                                                                                                   |
|  PILLAR 5: SUPPORTIVE CARE & TRIGGER MANAGEMENT                                                   |
|  • Active cooling blankets and **Acetaminophen** for hyperpyrexia.                                |
|  • **AVOID ASPIRIN / SALICYLATES:** Aspirin displaces T4 and T3 from Thyroid-Binding Globulin    |
|    (TBG), dramatically increasing free active hormone levels and exacerbating the crisis.         |
|  • IV crystalloid rehydration and aggressive treatment of underlying infection or obstetric trigger.|
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6. Maternal Hypoglycemia & Insulin-Related Emergencies

Hypoglycemia is listed alongside ketoacidosis and insulin in the NCC endocrine outline because insulin therapy causes as many peripartum emergencies as it prevents. Pregnancy both increases the frequency of severe hypoglycemia and degrades the warning symptoms that normally protect against it.

Definitions and Why Pregnancy Blunts the Warning

Level	Threshold	Clinical Meaning
Level 1 (alert)	Glucose < 70 mg/dL	Requires treatment with fast-acting carbohydrate
Level 2 (clinically significant)	Glucose < 54 mg/dL	Neuroglycopenia begins; serious, immediately actionable
Level 3 (severe)	Any value with altered mental status or requiring third-party assistance	A medical emergency defined by function, not by a number

Counter-regulatory hormone responses are attenuated in pregnancy, and tight glycemic targets drive the adrenergic warning threshold downward, so hypoglycemia unawareness is common — particularly in type 1 diabetes during the first trimester, where nausea and vomiting compound erratic intake.

The Two High-Risk Windows

First trimester: nausea, vomiting, and aggressive glycemic targets combine to produce the highest rate of severe hypoglycemia in the entire pregnancy.
Immediately after delivery of the placenta — the "insulin cliff." Abrupt withdrawal of human placental lactogen, progesterone, and cortisol removes pregnancy-induced insulin resistance within minutes. Insulin requirements fall by roughly half or more the moment the placenta is delivered, and insulin sensitivity returns to pre-pregnancy levels over the following 1 to 2 weeks. A patient left on her late-pregnancy insulin dose after delivery will become profoundly hypoglycemic. Insulin must be reduced pre-emptively at delivery, not after a low reading; breastfeeding lowers maternal glucose further.

Emergency Treatment

+---------------------------------------------------------------------------------------------------+
|                         TREATMENT OF MATERNAL HYPOGLYCEMIA                                        |
|                                                                                                   |
|  • CONSCIOUS, ABLE TO SWALLOW AND PROTECT THE AIRWAY ("Rule of 15"):                              |
|    - Give 15 to 20 g of fast-acting oral carbohydrate (glucose tablets, juice, regular soda).     |
|    - Recheck capillary glucose in 15 minutes and repeat until the value exceeds 70 mg/dL.         |
|    - Follow with a longer-acting carbohydrate and protein snack to prevent rebound.               |
|                                                                                                   |
|  • ALTERED MENTAL STATUS, SEIZING, OR UNABLE TO PROTECT THE AIRWAY:                               |
|    - IV access available: 25 g of 50% dextrose (D50W, 50 mL) IV push, OR 100 to 250 mL of         |
|      10% dextrose (D10W) through a peripheral line, then recheck in 15 minutes.                   |
|    - NO IV access: glucagon 1 mg IM or subcutaneously (nasal glucagon 3 mg is an alternative).    |
|      Glucagon is ineffective in glycogen-depleted states such as starvation or advanced liver     |
|      failure, so obtain IV access and give dextrose as soon as possible.                          |
|                                                                                                   |
|  • AFTER THE ACUTE CORRECTION — DO NOT STOP AT ONE BOLUS:                                         |
|    - Start a continuous dextrose infusion when the cause is long-acting insulin or a              |
|      sulfonylurea, because a single bolus is outlawed by the duration of the offending drug.      |
|    - Stop or halve the offending insulin, identify the precipitant, and monitor for hours.        |
+---------------------------------------------------------------------------------------------------+

The Differential Trap

Severe hypoglycemia produces seizure, obtundation, focal neurologic deficits, and agitation — meaning it perfectly mimics eclampsia, stroke, magnesium toxicity, local anesthetic systemic toxicity, sepsis, and amniotic fluid embolism. A point-of-care glucose is mandatory in every obstetric patient with a seizure or altered mental status, before the event is attributed to eclampsia. The reverse also holds: profound hypoglycemia is itself a hallmark of acute fatty liver of pregnancy (Section 12.2), where it reflects hepatic failure rather than excess insulin and demands treatment of the liver, not just the glucose. Transient maternal hypoglycemia is generally tolerated by the fetus; the fetal danger comes from maternal collapse, trauma, and hypoperfusion during a severe episode.

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Maternal Diabetic Ketoacidosis & Thyroid Storm Resuscitation Pathways

Test Your Knowledge

A 26-year-old G2P1 with Type 1 diabetes at 30 weeks of gestation presents to the obstetric emergency department with a 24-hour history of intractable nausea, vomiting, and generalized weakness following the onset of viral gastroenteritis. Fingerstick blood glucose is 182 mg/dL. Maternal vital signs are: blood pressure 98/58 mmHg, pulse 116 bpm, respiratory rate 28 breaths/min with deep Kussmaul breathing, and SpO2 98% on room air. Laboratory evaluation reveals: venous pH 7.21, serum bicarbonate 11 mEq/L, sodium 132 mEq/L, chloride 96 mEq/L, potassium 4.2 mEq/L, and serum beta-hydroxybutyrate 6.2 mmol/L. Continuous electronic fetal monitoring shows a baseline fetal heart rate of 165 bpm, minimal baseline variability, and repetitive shallow late decelerations with uterine contractions. Which of the following is the most appropriate next step in management?

Initiate rapid intravenous volume resuscitation with 0.9% normal saline, start continuous intravenous regular insulin at 0.1 units/kg/h with potassium supplementation, and maintain in utero fetal resuscitation while avoiding emergent delivery.

Perform an immediate emergency cesarean delivery under general anesthesia due to category III fetal heart rate tracing and acute fetal distress.

Administer a subcutaneous injection of 10 units of rapid-acting insulin lispro and discharge the patient on antiemetics once emesis is controlled.

Infuse two ampules of intravenous sodium bicarbonate over 15 minutes and discontinue all insulin until blood glucose rises above 250 mg/dL.

Test Your Knowledge

A 29-year-old G1P0 at 32 weeks of gestation with pregestational Type 1 diabetes is being treated in the intensive care unit for diabetic ketoacidosis. Initial blood glucose was 380 mg/dL, pH was 7.18, and serum bicarbonate was 9 mEq/L. After receiving 3 liters of normal saline and 4 hours of continuous IV regular insulin infusion at 0.1 units/kg/h, her blood glucose has decreased to 195 mg/dL. Her repeat venous pH is 7.26, serum bicarbonate is 14 mEq/L, and anion gap is 16 mEq/L. Which of the following is the most appropriate next step regarding fluid and insulin management?

Discontinue the intravenous insulin infusion completely and switch the IV fluids to 0.45% normal saline without dextrose until the blood glucose rises above 250 mg/dL.

Add 5% dextrose in 0.45% normal saline to the IV fluids while continuing the intravenous regular insulin infusion at a titrated rate of 0.05 to 0.1 units/kg/h until the anion gap closes.

Administer 50 mL of 50% intravenous dextrose bolus, stop the insulin infusion, and administer 10 units of subcutaneous glargine insulin immediately.

Increase the intravenous regular insulin infusion rate to 0.2 units/kg/h and infuse 0.9% normal saline with sodium bicarbonate to accelerate acidosis resolution.

Test Your Knowledge

A 31-year-old G2P1 at 28 weeks of gestation with known Graves disease presents to the labor and delivery triage unit in acute distress. She reports fever, palpitations, nausea, diarrhea, and severe anxiety. On examination, temperature is 39.2°C (102.6°F), blood pressure is 154/78 mmHg, pulse is 152 bpm with irregular rhythm (atrial fibrillation), and she is delirious. Her Burch-Wartofsky Point Scale score is 60. The team diagnoses thyroid storm. In what specific sequence should the primary pharmacological agents be administered?

Saturated solution of potassium iodide (SSKI) immediately, followed 1 hour later by propylthiouracil (PTU), intravenous aspirin, and oral levothyroxine.

Intravenous dexamethasone immediately, followed by high-dose aspirin for fever reduction, radioactive iodine ablation, and oral methimazole.

Propylthiouracil (PTU) loading dose, followed at least 1 hour later by inorganic iodine (SSKI or Lugol's solution), intravenous propranolol, and intravenous dexamethasone.

Intravenous labetalol loading dose, followed immediately by potassium iodide, discontinuation of all thionamides, and immediate emergency cesarean delivery.

Test Your Knowledge

A 22-year-old G1P0 at 26 weeks of gestation with Type 1 diabetes presents in moderate diabetic ketoacidosis. Point-of-care capillary glucose is 340 mg/dL. The initial basic metabolic panel reveals: sodium 134 mEq/L, potassium 3.0 mEq/L, chloride 100 mEq/L, and bicarbonate 12 mEq/L. Which of the following is the most appropriate initial management step regarding insulin and electrolyte therapy?

Administer an immediate intravenous bolus of regular insulin at 0.15 units/kg, followed by continuous infusion at 0.1 units/kg/h without potassium.

Administer 40 mEq of oral potassium chloride and start an immediate subcutaneous glargine insulin injection of 20 units.

Infuse two ampules of 8.4% sodium bicarbonate over 30 minutes to correct the acidosis before addressing serum electrolytes.

Hold the initiation of insulin therapy and administer intravenous potassium chloride at 20 to 30 mEq/h until the serum potassium rises above 3.3 mEq/L.

Test Your Knowledge

A 31-year-old G2P2 with type 1 diabetes managed on 62 units of insulin daily throughout the third trimester delivers a healthy term infant vaginally at 09:15. Her insulin orders are continued unchanged after delivery. At 12:40 the nurse finds her diaphoretic, confused, and unable to follow commands. Point-of-care glucose is 38 mg/dL and intravenous access is patent. What is the correct immediate action and the underlying explanation?

Administer 25 grams of 50% dextrose intravenously and reduce her insulin dose, because delivery of the placenta abruptly removes human placental lactogen, progesterone, and cortisol and cuts insulin requirements by roughly half or more within minutes.

Administer a 4 gram intravenous magnesium sulfate loading dose, because postpartum confusion in a diabetic patient most commonly represents late-onset eclampsia.

Give 15 to 20 grams of oral glucose gel and recheck in 15 minutes, because oral carbohydrate is preferred over intravenous dextrose in all postpartum patients.

Continue the current insulin regimen and give a 500 mL bolus of lactated Ringer's solution, because postpartum insulin requirements rise sharply in response to the physiologic stress of delivery.

Up Next

11.2 Peripartum Cardiomyopathy (PPCM), Acute Heart Failure, Acute Coronary Syndromes & Maternal Arrhythmias

Continue learning

C-OBE Obstetric Emergencies

C-OBE Obstetric Emergencies

11.1 Diabetic Ketoacidosis (DKA), Maternal Hypoglycemia & Endocrine Resuscitation in Pregnancy

Key Takeaways

Diabetic Ketoacidosis (DKA) in Pregnancy: Euglycemic DKA & Resuscitation

1. Pathophysiology of Accelerated Ketosis in Pregnancy

2. Euglycemic DKA: Diagnostic Criteria & Pitfalls

Clinical Triggers for Euglycemic DKA

Diagnostic Laboratory Criteria

3. Step-by-Step Resuscitation Protocol for Maternal DKA

Bicarbonate & Phosphate Therapy in Maternal DKA

4. Fetal Physiology, Electronic Fetal Monitoring (EFM) & Delivery Rules

Impact of Maternal Ketoacidosis on the Fetus

5. Thyroid Storm in Pregnancy: Evaluation & Stepwise Pharmacotherapy

Burch-Wartofsky Point Scale (BWPS)

Stepwise Multimodality Pharmacotherapy Protocol

6. Maternal Hypoglycemia & Insulin-Related Emergencies

Definitions and Why Pregnancy Blunts the Warning

The Two High-Risk Windows

Emergency Treatment

The Differential Trap

C-OBE Obstetric Emergencies

1Chapter 1: Maternal Assessment, Risk Stratification & Early Warning Systems

2Chapter 2: Obstetric Hemorrhage — Etiology, Assessment & Uterotonics

3Chapter 3: Obstetric Hemorrhage — Mechanical Interventions, Placental Disorders & Transfusion

4Chapter 4: Hypertensive Disorders of Pregnancy & Preeclampsia with Severe Features

5Chapter 5: Hypertensive Crisis, Eclampsia & Magnesium Sulfate Therapy

6Chapter 6: Maternal Resuscitation, Cardiac Arrest & Perimortem Cesarean

7Chapter 7: Amniotic Fluid Embolism & Maternal Shock States

8Chapter 8: Acute Intrapartum Delivery Emergencies

9Chapter 9: Uterine Inversion, Malpresentation & Obstetric Trauma

10Chapter 10: Maternal Sepsis, Intraamniotic Infection & Severe Infections

11Chapter 11: Endocrine, Cardiovascular, Respiratory & Neurologic Emergencies

12Chapter 12: Thromboembolism, Hepatorenal Disorders & Toxicologic Emergencies

13Chapter 13: Obstetric Anesthesia Emergencies & Critical Complications

14Chapter 14: Professional Practice, Team Communication, Debriefing & Health Equity

C-OBE Obstetric Emergencies

11.1 Diabetic Ketoacidosis (DKA), Maternal Hypoglycemia & Endocrine Resuscitation in Pregnancy

Key Takeaways

Diabetic Ketoacidosis (DKA) in Pregnancy: Euglycemic DKA & Resuscitation

1. Pathophysiology of Accelerated Ketosis in Pregnancy

2. Euglycemic DKA: Diagnostic Criteria & Pitfalls

Clinical Triggers for Euglycemic DKA

Diagnostic Laboratory Criteria

3. Step-by-Step Resuscitation Protocol for Maternal DKA

Bicarbonate & Phosphate Therapy in Maternal DKA

4. Fetal Physiology, Electronic Fetal Monitoring (EFM) & Delivery Rules

Impact of Maternal Ketoacidosis on the Fetus

5. Thyroid Storm in Pregnancy: Evaluation & Stepwise Pharmacotherapy

Burch-Wartofsky Point Scale (BWPS)

Stepwise Multimodality Pharmacotherapy Protocol

6. Maternal Hypoglycemia & Insulin-Related Emergencies

Definitions and Why Pregnancy Blunts the Warning

The Two High-Risk Windows

Emergency Treatment

The Differential Trap