According to the ACOG classification, which blood pressure reading defines Stage 2 hypertension in pregnancy?

Explanation

## ACOG Classification of Hypertension in Pregnancy **Key Point:** The American College of Obstetricians and Gynecologists (ACOG) defines Stage 2 hypertension in pregnancy as systolic blood pressure ≥160 mmHg or diastolic blood pressure ≥110 mmHg. This classification is critical for risk stratification and management decisions in pregnant patients. ### ACOG Blood Pressure Classification in Pregnancy | Classification | Systolic (mmHg) | Diastolic (mmHg) | Clinical Significance | |---|---|---|---| | **Elevated** | 120–129 | <80 | Increased monitoring; lifestyle modification | | **Stage 1 Hypertension** | 130–139 | 80–89 | Antihypertensive therapy considered; close follow-up | | **Stage 2 Hypertension** | ≥160 | ≥110 | Antihypertensive therapy initiated; increased risk of maternal/fetal complications | **High-Yield:** Stage 2 hypertension in pregnancy is associated with: - Increased risk of acute coronary syndrome - Increased risk of stroke - Increased risk of acute kidney injury - Increased risk of placental abruption - Increased risk of preterm delivery - Increased risk of fetal death ### Distinction from Non-Pregnant Population **Mnemonic: ACOG-Preg** — ACOG uses different thresholds for pregnancy than for non-pregnant adults: - Non-pregnant Stage 2 hypertension: ≥140/90 mmHg - **Pregnant Stage 2 hypertension: ≥160/110 mmHg** (higher threshold reflects the physiological changes of pregnancy) ### Clinical Management Implications **Clinical Pearl:** Stage 2 hypertension in pregnancy warrants: 1. Immediate antihypertensive therapy (target: <140/90 mmHg) 2. Urgent evaluation for preeclampsia with severe features 3. Assessment for end-organ damage 4. Consideration of delivery if ≥34 weeks with preeclampsia 5. Fetal monitoring and assessment of placental function ### Why the Higher Threshold in Pregnancy? Pregnancy is a state of physiological vasodilation and increased cardiac output. A BP of 140/90 mmHg in pregnancy represents a greater deviation from the normal pregnant state than the same reading in a non-pregnant woman, hence the higher threshold (160/110 mmHg) is used to define Stage 2 hypertension.