Abstract
Objective
Target population
Benefits, harms, and costs
Evidence
Validation methods
Intended users
RECOMMENDATIONS
- 1.Pre-conception counselling is suggested for women with pre-pregnancy hypertension to advise on individualized management during pregnancy (conditional, low).
- 2.Replacing angiotensin-converting enzyme (ACE) inhibitors or angiotensin-receptor blockers (ARBs) with other antihypertensives in women planning pregnancy is recommended unless there is a compelling clinical indication not to (strong, low).
- 3.In early pregnancy, women should be screened, at a minimum, for clinical risk markers for preeclampsia (strong, moderate).
- 4.If testing is available, women should be screened at 11–14 weeks gestation using a combination of clinical risk markers, uterine artery pulsatility index, and placental growth factor (PlGF) to individualize the risk of developing preeclampsia (strong, moderate).
- 5.For women at increased risk of preeclampsia, low-dose acetylsalicylic acid (81 or 162 mg/d) is recommended (strong, high), to be taken at bedtime (strong, moderate), preferably before 16 weeks gestation (conditional, moderate), and discontinued by 36 weeks gestation (conditional, low).
- 6.For all other women, low-dose acetylsalicylic acid is not recommended (strong, moderate).
- 7.For all women with low dietary intake of calcium (<900 mg/d), oral calcium supplementation of at least 500 mg/d is suggested to prevent preeclampsia (conditional, low).
- 8.For all women, vitamin D supplementation over and above Health Canada’s recommendation for adults is not suggested to prevent preeclampsia (conditional, moderate).
- 9.For all women, exercise is recommended to prevent preeclampsia (strong, moderate).
- 10.For women at increased risk of preeclampsia, who are overweight or obese dietary advice (reduce calories and choose foods with a low glycemic index) and exercise are recommended (conditional, moderate).
- 11.Inpatient care should be provided for women with severe hypertension or preeclampsia with 1 or more maternal adverse conditions (good practice point).
- 12.Bed rest is not suggested for any women with preeclampsia (conditional, low).
- 13.Antihypertensive therapy is recommended for pregnant women with an average systolic blood pressure ≥140 mm Hg or diastolic blood pressure ≥90 mm Hg, regardless of the hypertensive disorder of pregnancy (strong, moderate).
- 14.A diastolic blood pressure of 85 mm Hg should be targeted for pregnant women on antihypertensive therapy with chronic or gestational hypertension (strong, moderate), and a similar target, considered for women with preeclampsia (conditional, low).
- 15.Antihypertensive therapy (oral or parenteral) is urgently recommended for women with severe hypertension (i.e., systolic blood pressure ≥160 mm Hg or diastolic blood pressure ≥110 mm Hg) in pregnancy or postpartum (strong, low).
- 16.Magnesium sulphate is recommended for first-line treatment of eclampsia and prophylaxis against eclampsia in women with preeclampsia and severe hypertension or adverse maternal conditions (strong, high).
- 17.Platelet transfusion should be considered if a woman’s platelet count is <20 × 109/L before vaginal delivery or <50 × 109/L before cesarean delivery, or at any time if there is excessive active bleeding, known platelet dysfunction, rapidly falling platelet count, or coagulopathy (strong, low).
- 18.For women with chronic hypertension, expectant care should be undertaken from fetal viability to <370 weeks gestation, unless there is an indication for birth (strong, very low). Initiation of delivery can be offered at 380 to 396 weeks gestation but should be advised from 400 weeks gestation (conditional, low).
- 19.For women with gestational hypertension, expectant care should be undertaken from fetal viability to <370 weeks, unless there is an indication for birth (strong, low). When gestational hypertension arises before 370 weeks, initiation of delivery can be offered at 380 to 396 weeks gestation but should be advised from 400 weeks gestation (conditional, low). For women who are already at 370 weeks gestation or later and present with gestational hypertension, initiation of delivery should be discussed (strong, moderate).
- 20.For women with preeclampsia, expectant management may be considered from fetal viability until <340 weeks gestation, but only in perinatal centres capable of caring for very preterm infants (conditional, moderate). At 340–356 weeks gestation, initiation of delivery should be discussed, as it decreases maternal but increases neonatal risk, particularly if antenatal corticosteroids are not prescribed (strong, moderate). At 360–366 weeks gestation, initiation of delivery should be considered (strong, moderate). At 370 weeks gestation or later, initiation of delivery is recommended (strong, high).
- 21.Blood pressure should be measured regularly (at least twice) in the first 2 weeks after delivery in women with hypertension (good practice point).
- 22.As women may develop preeclampsia for the first time postpartum, those with new or worsening hypertension and/or symptoms of preeclampsia should be evaluated accordingly (good practice point).
- 23.For lactating women, the following antihypertensive drugs are suggested: labetalol, methyldopa, nifedipine, enalapril, and captopril (conditional, low).
- 24.Clinical follow-up should be provided for women with gestational hypertension and preeclampsia to ensure normalization of hypertension, clinical features, and laboratory test results (good practice point).
- 25.Women with gestational hypertension and preeclampsia may benefit from interventions to reduce their risk of a hypertensive disorder of pregnancy in a future pregnancy and from screening for cardiovascular risk factors (conditional, low).
Keywords
Abbreviations:
ACE (angiotensin-converting enzyme), ACR (albumin:creatinine ratio), ARB (angiotensin-receptor blocker), ASA (acetylsalicylic acid), AST (aspartate aminotransferase), ALT (alanine aminotransferase), CKD (chronic kidney disease), FHR (fetal heart rate), FMF (Fetal Medicine Foundation), HDP (hypertensive disorder of pregnancy), PCR (protein:creatinine ratio), PIERS (Pre-eclampsia Integrated Estimate of Risk Score), PlGF (placental growth factor)Purchase one-time access:
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Footnotes
This document reflects emerging clinical and scientific advances as of the publication date and is subject to change. The information is not meant to dictate an exclusive course of treatment or procedure. Institutions are free to amend the recommendations. The SOGC suggests, however, that they adequately document any such amendments.
Informed consent: Patients have the right and responsibility to make informed decisions about their care in partnership with their health care provider. In order to facilitate informed choice, patients should be provided with information and support that is evidence-based, culturally appropriate, and personalized. The values, beliefs and individual needs of each patient in the context of their personal circumstances should be considered and the final decision about care and treatment options chosen by the patient should be respected.
Language and inclusivity: The SOGC recognizes the importance to be fully inclusive and when context is appropriate, gender-neutral language will be used. In other circumstances, we continue to use gendered language because of our mission to advance women’s health. The SOGC recognizes and respects the rights of all people for whom the information in this document may apply, including but not limited to transgender, non-binary, and intersex people. The SOGC encourages health care providers to engage in respectful conversation with their patients about their gender identity and preferred gender pronouns and to apply these guidelines in a way that is sensitive to each person’s needs.