Intrapartum Fetal Surveillance in High-Risk Pregnancies

Rationale for Continuous Monitoring

Controlled hypertension on medication places this patient at risk for superimposed preeclampsia, placental insufficiency, and acute hypertensive crises during labor, according to the International Society for the Study of Hypertension in Pregnancy (ISSHP) 1, 2
Fetal growth restriction (less than 10th percentile) indicates uteroplacental insufficiency and increased risk of intrapartum hypoxia and fetal compromise, as emphasized by the American College of Radiology 1, 2, 3

The American College of Radiology guidelines state that antepartum fetal testing in high-risk conditions, including suspected growth restriction, is recommended in all situations where surveillance would ordinarily be performed 3

Continuous blood pressure monitoring is recommended for patients with hypertensive disorders, according to the American College of Cardiology 1, 2, 4
Assessment for severe hypertension (≥160/110 mmHg) requiring urgent treatment is crucial, as stated by the American Heart Association 1, 2, 5

Severe hypertension (≥160/110 mmHg) requires urgent treatment within minutes using oral or intravenous medications to prevent maternal stroke, as recommended by the American College of Obstetricians and Gynecologists (ACOG) 1, 2, 4, 5
Magnesium sulfate for seizure prophylaxis should be administered if severe hypertension develops or if any neurological signs/symptoms appear, according to the ACOG 1, 4, 5

At least 25% of gestational hypertension cases progress to preeclampsia, and this can occur rapidly during labor, highlighting the importance of continuous monitoring, as noted by the ISSHP 1, 2
Blood pressure alone is not a reliable indicator of disease severity; serious organ dysfunction can develop at relatively mild levels of hypertension, as stated by the American Society of Hypertension 4

Fetal growth restriction is a key risk of chronic essential hypertension and requires enhanced fetal surveillance, with a substantially increased risk of intrapartum hypoxia and fetal compromise, particularly in cases where the fetus is at a low percentile, indicating uteroplacental insufficiency 6, 7, 8
The combination of maternal hypertension and fetal growth restriction creates a compounded risk for acute fetal decompensation during labor, highlighting the need for continuous surveillance 6, 7, 8

Target blood pressure should be maintained at 110-140/85 mmHg to prevent maternal stroke and other complications, with continuous blood pressure monitoring essential for detecting severe hypertension (≥160/110 mmHg) that requires urgent treatment within minutes 6, 7, 8
Clinical assessment for signs of preeclampsia progression, including proteinuria, neurological symptoms, and end-organ damage, is crucial in managing high-risk pregnancies with hypertension 6, 7

Monitor complete blood count (hemoglobin, platelet count), liver transaminases, uric acid, and creatinine at minimum, and perform urinalysis at each assessment for developing preeclampsia, to ensure timely detection of potential complications 6, 7
If blood pressure reaches ≥160/110 mmHg, urgent treatment is required using oral nifedipine or intravenous labetalol/hydralazine, and magnesium sulfate for seizure prophylaxis should be administered if severe hypertension develops or any neurological signs/symptoms appear 7

Delivery at 39 weeks is appropriate timing for gestational hypertension without severe features, provided fetal monitoring remains reassuring, according to guidelines for managing high-risk pregnancies with hypertension and fetal growth restriction 6, 7, 8

The European Society of Cardiology recommends continuous electronic fetal heart rate monitoring (CTG) and frequent maternal blood pressure assessment for patients with controlled hypertension and fetal growth restriction below the 10th percentile 9
The American College of Cardiology suggests that blood pressure ≥160/110 mmHg lasting >15 minutes constitutes a hypertensive emergency requiring immediate treatment, with first-line urgent treatment options including oral nifedipine or intravenous labetalol/hydralazine 10
Continuous maternal blood pressure monitoring is required throughout labor, with a target BP at 110-140/85 mmHg to prevent maternal stroke, and magnesium sulfate for seizure prophylaxis must be administered if severe hypertension develops or any neurological symptoms appear 10
The European Society of Cardiology recommends clinical assessment for signs of preeclampsia progression, including proteinuria, neurological symptoms, and epigastric pain, as well as monitoring for oliguria as an early maternal warning sign 10

Baseline and serial laboratory monitoring should include complete blood count, liver transaminases, serum creatinine, uric acid, and urinalysis for proteinuria assessment, to detect potential complications such as HELLP syndrome and renal dysfunction 10, 11

The European Society of Cardiology recommends enhanced surveillance after delivery, with BP and urine checks at 6 weeks postpartum, and persistent hypertension confirmed by 24-hour ambulatory monitoring 10, 11, 12
Women with persisting hypertension or proteinuria at 6 weeks require specialist referral, according to the European Society of Cardiology guidelines 12