Primeros pasos para la planificación del control del embarazo

Several studies have shown that pregnant patients with epilepsy may be at increased risk for maternal mortality and morbidity. The absolute risk of death during pregnancy is increased compared to the general population, but the absolute risk remains very low. The reasons for this increased risk are not fully clear. There also may be increased risk of several pregnancy complications including preeclampsia, preterm birth, hemorrhage, and small for gestational age (SGA) babies. This emphasizes the need for careful management throughout pregnancy. If available, consultation with maternal-fetal medicine may be helpful. Active monitoring and adjustment of seizure medications for optimal seizure control may also play a role in reducing maternal risk.

Mantener el control de las convulsiones siempre es importante para las pacientes con epilepsia, pero es un componente crucial de la atención del embarazo. El estudio Maternal Outcomes and Neurodevelopmental Effects of Antiepileptic Drugs (MONEAD) mostró que cuando una paciente recibe la atención adecuada para la epilepsia, no hay indicios de un aumento de las tasas de convulsiones en las pacientes embarazadas en comparación con las que no estaban embarazadas . 

However, most pregnant patients will need more frequent medication dose adjustments than non-pregnant patients, underscoring the importance of frequent and proactive care appointments. Establish care with patients and inform the patient’s other providers (OB-GYNs, neurologists, etc.) as soon as pregnancy is confirmed.

Si aún no los está tomando, el paciente debe comenzar a tomar ácido fólico y vitaminas prenatales lo antes posible. Deben continuar con la suplementación con ácido fólico durante sus años fértiles, incluso durante el embarazo, durante la lactancia y entre bebés.

Los temas que se tratan en esta página incluyen:

Folic Acid & Pregnancy

All patients with epilepsy of childbearing potential should take at least 400-1000 mcg of folic acid daily. In the United States, 1000 mcg (1 mg) can be prescribed as a tablet. For patients desiring pregnancy, many clinicians prescribe 1000 mcg (1 mg) of folic acid in addition to recommending and prenatal vitamins (1800 mcg or 1.8 mg total dose).

Comprobaciones y ajustes de nivel de ASM

Because clearance of several ASMs increases during gestation, therapeutic drug monitoring has an important role in controlling seizures during pregnancy. The degree to which ASM clearance changes varies between ASMs and from patient to patient.

If a pre-pregnancy ASM level is not available, obtain a level as soon as possible in pregnancy. The patient’s individualized target level should be at this level or slightly above (depending on the known pharmacokinetics in pregnancy). Level checks should then be obtained at approximately four-week intervals beginning as soon as there is a positive pregnancy test. See ASM Level Checks for more information on performing level checks and resulting dosage adjustments.

Ideally, switching to an ASM with a lower risk of major congenital malformations should not be attempted once a patient is already pregnant. This exposes the fetus to more than one medication and may increase the risk for seizures. See Switching ASMs for more information, including examples in which the benefits versus risks of switching ASMs may be indicated.

Timing of ASM Blood Levels

Given that OB visits are every four weeks (until increased frequency later in pregnancy), the OB clinic visit can often be a good time to coordinate care to get ASM blood levels. Ensure patients know that level checks need to occur at the same time of day each time and that these four-week blood checks are critical to their seizure control.

If a neurologist is involved in the patient’s care, the neurology practice is usually in charge of ordering and following ASM levels and increasing doses. However, all providers should be aware of the need for ASM level monitoring. 

Establecimiento del control de las convulsiones

The MONEAD study demonstrated that seizure frequency was no more likely to increase in pregnant versus non-pregnant patients receiving appropriate care (e.g., ASM dosage adjustments during pregnancy). Pregnant patients with epilepsy had much more frequent medication dosage increases than non-pregnant patients with epilepsy and these adjustments ensure seizure control.

At each prenatal visit, the OB clinicians should assess if the patient is having any increase in seizures, including: 

NOTE: An increase in milder seizure types can often serve as a warning for the increased likelihood of convulsive tonic-clonic seizures, which are important to avoid. The goal is to balance maternal seizure stability while avoiding over-exposing the developing fetus to higher levels of ASMs than necessary. See Seizure Control for more information on this topic.

Citas clave y ecografías

Cada 4 semanas

ASM blood level checks performed at a time and location that allows consistency for the patient. To begin soon after a positive pregnancy test.

At 19-20 Weeks

At this stage, a complex and comprehensive evaluation of fetal survey ultrasound emphasizing cardiac views should be performed. (This is sometimes known as ‘anatomy scan’ or ‘level II’ ultrasound.) Smaller clinics might need to refer out to access this ultrasound. 

Es probable que una ecografía fetal sea innecesaria a menos que la ecografía de anatomía fetal genere una preocupación. Sin embargo, algunos obstetras y ginecólogos pueden recomendar un ecocardiograma fetal si el paciente toma un ASM con un mayor riesgo de malformaciones cardíacas (p. ej., fenobarbital).

Tercer trimestre 

One or more surveillance growth ultrasounds in the third trimester should be considered for all patients with epilepsy. There is a potentially increased risk for intrauterine growth restriction with some ASMs (notably topiramate and valproic acid).

Between 34-36 weeks, consider a consultation with obstetrical anesthesia (where available), especially if the patient has poor seizure control.

Planificación de entregas

A plan for delivery logistics needs to be created and shared with all members of the care team and the patient’s support system. A controlled environment is important, so we strongly recommend a hospital inpatient setting as the safest birth location.

In general, epilepsy should not affect the timing of delivery. Well-controlled patients can be delivered according to obstetric indications. Earlier delivery may be considered for patients with significantly deteriorating seizure control, especially tonic-clonic seizures. Patients whose seizures are particularly sensitive to sleep deprivation, such as those with generalized epilepsy, may be at increased risk for seizures in the third trimester. Some research also suggests that patients with frontal lobe and/or nocturnal seizures may be at increased risk for clusters during pregnancy. In some cases where there are active clusters or convulsive seizures, late preterm (36 weeks) or early term (37-39 weeks) gestation could be considered appropriate. 

Epidural and spinal anesthesia are safe for patients with epilepsy and should be offered per standard obstetrical indication. Epidural anesthesia may have advantages in laboring patients with epilepsy as it both reduces pain (and therefore stress) as well as allowing sleep during early labor.  

El plan de entrega debe abordar lo siguiente:

  • Preparación para una posible incautación.
    • Have benzodiazepines readily accessible:
      • Give 1-2 mg IV lorazepam for convulsive, repetitive, or prolonged seizures. 
      • Give 1 mg lorazepam for isolated, non-convulsive seizures. Repeat this dose if seizures continue.
  • Avoiding water or tub labor or births delivery.
  • Priorizar el "sueño como medicina" (la epidural puede ayudar a la paciente a dormir lo suficiente durante el trabajo de parto).
  • Los pacientes deben traer sus medicamentos caseros al hospital en los frascos originales de medicamentos (es posible que los hospitales no tengan formulaciones de liberación prolongada, por ejemplo).
  • Postpartum tapering plan (determined several weeks before delivery and given to the patient and the obstetrician – waiting until after delivery is not practical and risks toxicity in some cases). See Anti-Seizure Medication Tapering Schedule Tool.

Women with Epilepsy Should Deliver Vaginally

Epilepsy alone is not an indication for a C-section. Vaginal deliveries account for two-thirds of deliveries in the United States, and unless there are obstetric indications for a C-section, pregnant patients with epilepsy should deliver vaginally.

Plan de atención posparto

Formular el plan de atención posparto con la paciente y el sistema de apoyo de la paciente durante una visita de embarazo. El plan debe incluir:

  • Un plan de alimentación. Después del parto, la paciente y el bebé requieren cuidados y apoyo para garantizar su salud y seguridad. Al establecer un plan de alimentación, los pacientes deben considerar si optan por la lactancia materna, la alimentación con fórmula o una combinación de ambas. 
  • A sleep plan. Work with your patient to establish a plan that includes at-home sleeping arrangements and shifts with other caregivers. The goal is to ensure the patient receives at least one uninterrupted four-hour stretch of sleep at night and an additional two hours of naps during the day to reduce the risk of seizures. Reassure them that most babies begin to sleep for extended periods of time at 3-5 months, so these arrangements are temporary.

Consulte la página Atención posparto para obtener más información sobre este tema.

Guíe a sus pacientes

La programación de citas y chequeos con controles de nivel de ASM y otros hitos importantes debe estar bien documentada y presentada de una manera que se sienta factible y no abrumadora.

Provide clear lines of communication for when potential problems arise so there’s no confusion.

Reviewed by: EPMC Expert Panel, March 2025