DKA IN pregnancy

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"diabetic ketoacidosis" AND pregnancy

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Diabetic Ketoacidosis (DKA) in Pregnancy

Definition and Overview

DKA in pregnancy is a combined medical and obstetric emergency. While classically associated with Type 1 DM, it is now increasingly reported in Type 2 DM and even gestational diabetes. The condition is dangerous at lower glucose thresholds than in non-pregnant adults and can progress more rapidly.

Creasy & Resnik's Maternal-Fetal Medicine, p. 1433
Tintinalli's Emergency Medicine, p. 664

Incidence and Prognosis

Parameter	Historical	Modern
Incidence in T1DM pregnancy	>20%	<1%
Intrauterine fetal death rate	up to 35%	5% or less

The improvement is due to earlier diagnosis, better prenatal counseling, and dedicated care with a primary provider.

Why Pregnancy Predisposes to DKA

Pregnancy creates a uniquely vulnerable metabolic state:

Physiologic respiratory alkalosis - chronic hyperventilation lowers PCO2, raising the buffering reserve. This means the serum pH can be deceptively normal even when significant ketoacidosis is already present.
Lower glucose threshold - DKA develops at glucose levels <300 mg/dL (sometimes at near-normal levels - "euglycemic DKA"), compared to typical DKA in non-pregnant patients.
Accelerated starvation ketosis - even brief fasting (especially in the third trimester) can trigger ketone production.
Insulin resistance increases 70-100% above baseline by the second and third trimesters, raising insulin demand.
Continuous basal insulin requirement - there is no physiologic "rest" from insulin need during pregnancy.

Rosen's Emergency Medicine, p. 967

Precipitating Factors

Infections: pyelonephritis (most common), pulmonary infections, GI viral infections, soft tissue infections
Poor compliance or missed insulin doses
New-onset (undiagnosed) T1DM
Hyperemesis gravidarum (prevents oral intake and insulin dosing)
Insulin pump failure - DKA can develop very quickly, especially in patients who recently started using a pump
Iatrogenic causes:
- Beta-mimetic tocolytics (e.g., terbutaline) - raise blood glucose
- Corticosteroids for fetal lung maturity - cause significant hyperglycemia
- Withholding insulin therapy before planned procedures
Rosen's Emergency Medicine, p. 967; Tintinalli's Emergency Medicine, p. 664

Why DKA is Dangerous for the Fetus

High plasma glucose and ketones are freely transported across the placenta
The fetus may be unable to secrete enough insulin to handle the glucose load
This causes in utero hypoxia and fetal DKA
Severe ketoacidosis reduces fetal oxygen delivery and can cause perinatal asphyxia
Fetal heart rate abnormalities (non-reassuring patterns) are common but usually resolve once maternal metabolic homeostasis is restored

Screening and Diagnosis

Screen any pregnant diabetic patient who is ill-appearing with persistent nausea/vomiting and/or glucose ≥180 mg/dL with:

Serum or urine ketones
Serum chemistry panel (electrolytes, bicarbonate)
Arterial blood gas

Key pitfall: Do NOT rely only on serum pH for screening. Physiologic respiratory alkalosis of pregnancy masks acidosis. Serum acetone or beta-hydroxybutyrate is the recommended screening test for any pregnant DM patient with vague symptoms (headache, nausea, vomiting, fatigue).

DKA is most common in the second or third trimester and at >20 weeks gestation when episodes are more severe and rapid (can develop over hours, not days).

Management

General Principles

Management is largely the same as in non-pregnant patients, with pregnancy-specific additions.

Pregnancy-Specific Additions

Obtain fetal heart tones immediately
Administer supplemental oxygen
Position patient in left lateral decubitus to displace uterus and improve uterine blood flow
Continuous fetal heart rate monitoring if DKA occurs after 24 weeks
DKA is NOT an indication for emergency delivery - correct the maternal metabolic disorder first; fetal status almost always normalizes

Treatment Protocol (Based on ACOG 2018 / Creasy & Resnik Table 59.4)

Phase	Intervention
Fluids	0.9% NaCl at 1000 mL/h x 2h, then 500 mL/h; total 6-8 L over 24h. Add D5 to saline when glucose <250 mg/dL
Insulin	IV bolus 20 U, then 5-10 U/h infusion. Continue insulin even at normoglycemia until bicarbonate normalizes
Potassium	KCl 20 mEq/h when K+ is normal or low; monitor ECG continuously; check K+ every 2-4 hours
Bicarbonate	Give 50 mEq NaHCO3 (1 ampule) if pH <7.1; repeat until pH >7.1
Glucose monitoring	Normalize glucose gradually over 4-8 hours; rapid correction risks rebound hypoglycemia
Recovery	Continue 0.9% NaCl at 100 mL/h for 24-28h post-correction; return to subcutaneous insulin after glucose stable for ≥12h

Critical point: Fluid and insulin therapy must be continued even after glucose normalizes until bicarbonate levels return to normal. Stopping early risks recurrence of DKA. The lagging acidosis persists after glucose correction.

Treat the Precipitating Cause

Broad-spectrum antibiotics for pyelonephritis or other infections
Address hyperemesis, pump failure, or iatrogenic factors

Fetal Management

Timing	Action
Any gestation	Assess fetal heart tones; reassess after metabolic correction
>24 weeks	Continuous CTG or biophysical profile
Non-reassuring fetal status	DO NOT rush to cesarean - correct maternal acidosis first
Persistent fetal compromise after adequate maternal treatment	Delivery may then be considered if maternal condition is stable

Key Differences from Non-Pregnant DKA

Feature	Non-Pregnant	Pregnant
Blood glucose threshold	Typically >250 mg/dL	Can be <180-250 mg/dL ("euglycemic DKA")
Speed of onset	Hours to days	Can develop within hours
Serum pH reliability	Reliable	Deceptively normal (respiratory alkalosis)
Screening test	pH/glucose	Beta-hydroxybutyrate or serum acetone
Fetal risk	N/A	Fetal death up to 35% historically, now ~5%
Indication for delivery	N/A	DKA alone is NOT an indication

Insulin Pump Considerations

Patients using continuous SC insulin infusion pumps can develop DKA rapidly - especially those who recently started pump therapy. Management is identical to standard DKA in pregnancy. Pump use during pregnancy is equivalent to, but not superior to, scheduled injections.

Sources:

Creasy & Resnik's Maternal-Fetal Medicine: Principles and Practice (Chapter 59, p. 1433-1434)
Tintinalli's Emergency Medicine: A Comprehensive Study (p. 664-665)
Rosen's Emergency Medicine: Concepts and Clinical Practice (p. 967)

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