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 Table of Contents  
REVIEW
Year : 2018  |  Volume : 3  |  Issue : 2  |  Page : 83-87

Medication for management of pregnancy-induced hypertension


Department of Cardiology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China

Date of Web Publication6-Jul-2018

Correspondence Address:
Wei Song
Department of Cardiology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2542-3975.235153

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  Abstract 

Hypertension refers to increased arterial blood pressure and can be divided into two categories: primary and secondary. Primary hypertension caused by angiogenic degenerative changes is a degenerative disease. With liberalization of China’s reproduction policy and increases in maternal age, the prevalence of pregnancy-induced hypertension (PIH) in China has increased gradually. PIH is not a type of primary hypertension, but there are differences in the treatment of these two types of hypertension. Here, we review the choice and use of drugs for PIH management using drugs for the management of primary hypertension as a reference. First-line drugs such as labetalol, nifedipine, or methyldopa should be taken via the oral route if blood pressure is ≥ 150/90 mmHg. For chronic hypertension, other drugs should be added after the first drug at the highest concentration has been revealed to be ineffective. If the blood pressure of patients with acute hypertension is ≥ 160/110 mmHg, maternal stroke or eclampsia can result. If PIH patients are about to deliver, they can be given labetalol (i.v.), hydralazine (i.v.) or nifedipine (p.o.). Moreover, all anti-hypertensive treatments should be based on considerations of maternal and fetal safety.

Keywords: pregnancy; hypertension; preeclampsia; eclampsia; medication


How to cite this article:
Lin Y, Zhang Y, Jiang YN, Song W. Medication for management of pregnancy-induced hypertension. Clin Trials Degener Dis 2018;3:83-7

How to cite this URL:
Lin Y, Zhang Y, Jiang YN, Song W. Medication for management of pregnancy-induced hypertension. Clin Trials Degener Dis [serial online] 2018 [cited 2018 Dec 14];3:83-7. Available from: http://www.clinicaltdd.com/text.asp?2018/3/2/83/235153


  Introduction Top


Hypertension refers to increased arterial blood pressure. Long-term hypertension can lead to coronary artery disease, stroke, heart failure, atrial fibrillation, peripheral vascular disease, vision loss, chronic kidney disease, and dementia.[1],[2] Hypertension can be divided into primary and secondary types.[3] Primary hypertension accounts for 90–95% of hypertension cases.[3],[4] Primary hypertension caused by angiogenic degenerative changes is a type of degenerative disease.[5]

Blood pressure (BP) measured at intervals during pregnancy > 140/90 mmHg is considered to denote PIH. The prevalence of PIH worldwide is 8–10%,[6],[7] whereas that in China is 5.6–9.4%.[8] China has a two-child policy, so the maternal age may increase, which may further increase PIH prevalence.

Drugs used for the management of primary hypertension are ganglionic blockers, adrenergic neuron-blocking agents, alpha-blockers, diuretics, and beta blockers.[9] PIH is different from primary hypertension, but similarities exist in the treatment of these two types of hypertension. Using drugs for the management of primary hypertension as a reference, we review the selection and use of drugs for PIH management to provide evidence for its clinical treatment.


  Classification and Definition of PIH Top


According to the guideline set by the American Congress of Obstetricians and Gynecologists (ACOG) in 2013, there are four categories of hypertension during pregnancy.

The first type of hypertension during pregnancy is preeclampsia-eclampsia. In the absence of proteinuria, preeclampsia is diagnosed as hypertension in association with thrombocytopenia (platelet count < 100 000/mL), impaired liver function (increased blood levels of liver transaminases to twice the normal concentration), new development of renal insufficiency (increased serum creatinine > 1.1 mg/dL or doubling of serum creatinine in the absence of other renal disease), pulmonary edema, or new-onset cerebral/visual disturbances. The second type is chronic hypertension. This is defined as systolic blood pressure (SBP) > 140 mmHg and/or diastolic blood pressure (DBP) ≥ 90 mmHg before pregnancy or at a gestational age of 20 weeks, or if BP at 12 weeks post partum remains abnormal. The third type is chronic hypertension with superim-posed preeclampsia. This is chronic hypertension in association with preeclampsia. The final type is PIH developing after 20 weeks without proteinuria or the systemic findings mentioned above.[10],[11] For the convenience of initiating antihypertensive medication, PIH severity is usually divided into two categories: (i) mild–moderate (SBP: 140-159 mmHg; DBP: 90–109 mmHg) and severe (SBP ≥ 160 mmHg; DBP ≥ 110 mmHg).[12]


  Pathophysiologic changes in PIH Top


Under physiologic conditions, the BP of pregnant women begins to decrease after pregnancy onset. Simultaneously, cardiac output increases slightly, and peripheral vascular resistance decreases significantly. Moreover, renal blood flow and the estimated glomerular filtration rate increase. These conditions peak at 12 weeks of gestational age. Peripheral vascular resistance and BP also increase slightly during pregnancy. These tendencies return to the pre-pregnancy level after 36 weeks of gestational age.[13] The pathologic changes of PIH are spasm of small arteries and sodium retention in the whole body, which can result in target-organ damage and eclampsia. In addition to pathologic changes, several risk factors can induce eclampsia: nulliparity; multiple gestation; family history of preeclampsia; chronic hypertension; diabetes mellitus; renal disease; history of preeclampsia, especially if early (before 34 weeks) in a previous pregnancy; history of hemolysis; increased level of liver enzymes; HELLP syndrome in a previous pregnancy, obesity; hydatidiform mole.


  Damage Caused by PIH Top


PIH is a pregnancy complication that threatens maternal and fetal health. The risk of restriction of fetal growth and placental abruption is increased greatly in PIH patients.[14] In the mother, the risk of brain edema, acute heart failure, stroke, and acute renal failure is also increased due to the pathologic changes wrought by PIH. A recent large meta-analysis showed that women with a history of pre-eclampsia had approximately double the risk of ischemic heart disease, stroke and venous thrombo-embolic events 5–15 years after the pregnancy.[15] Also, the risk of developing hypertension is almost four-fold in women with a history of pre-eclampsia.[16]


  Non-Pharmacologic Management of PIH Top


In women with PIH, a normal diet without salt restriction is advised, particularly close to delivery. Salt restriction may lead to small intravascular volume. Calcium supplementation (≥ 1 g/day) is associated with a significant reduction in pre-eclampsia risk, particularly for women on low-calcium diets. Fish-oil supplementation and supplementation with vitamins and nutrients have no role in the prevention of hypertensive disorders.[17] Clinical trials have not shown a beneficial effect of vitamin D supplementation on preeclampsia prevention, but the dose, timing, and duration of supplementation should be investigated in future research.[18] Aerobic exercise for 30–60 minutes twice a week during pregnancy can reduce PIH risk significantly.[19]


  Pharmacologic Management of PIH Top


Details are shown in [Table 1].
Table 1: Oral medication and doses used in pregnancy-induced hypertension

Click here to view


BP Control

A major benefit of BP control is to reduce the prevalence of severe hypertension and decrease the risk of maternal and fetal complications.[20],[21] A common consensus among national and international guidelines is to start medication at BP ≥ 160/110 mmHg.[21],[22],[23] Guidelines from the American Heart Association/American Stroke Association suggest considering pharmacologic therapy for BP at 150–159/100–109 mmHg.[22] However, the European Society of Cardiology recommends treatment of BP ≥ 140/90 mmHg in women with organ damage, symptoms or superimposed PIH on chronic hypertension.[11],[24] In patients with PIH, reducing the risk of maternal organ damage without affecting placental blood flow is important. However, there is no evidence regarding the target for BP control. In 2014, the Japanese Society of Hypertension suggested a target SBP ≤ 160 mmHg, target DBP ≤ 110 mmHg or a 15–20% decrease in the mean BP.[25] A recent large clinical trial, the Control of Hypertension In Pregnancy Study (CHIPS), demonstrated that women who can maintain BP at 130–140/85 mmHg have fewer episodes of severe hypertension in pregnancy.[20] Importantly, there were no adverse fetal effects in the lower-BP target group, which challenged a previous concern that lowering BP to “normal” might be associated with reduced fetal growth.[26] The incidence of preeclampsia is similar in women treated with a standard, less tightly controlled DBP (100 mmHg) or tightly controlled DBP (85 mmHg). The ACOG recommends therapy adjustment to maintain BP at 120–160/80–105 mmHg during pregnancy.[10] The target range is narrower in Canadian guidelines and is divided further into 130–155/80–105 mmHg for women with chronic hypertension without comorbidities, and < 140/90 mmHg if comorbidities are present.[23]

Drugs for PIH treatment

Methyldopa

The α2 adrenergic receptor agonist methyldopa is used widely as a sympatholytic drug. It is first-line treatment for PIH.[27],[28] Serious adverse effects on maternal or fetal conditions have not been reported during 40 years of use. The recommended daily dose of methyldopa is 0.5–3.0 g in 2–4 doses.[29] Side-effects include sleepiness, dry mouth, general malaise, hemolytic anemia, and hepatopathy.

Hydralazine

Previously, the vasodilator hydralazine was recommended as first-line treatment for severe hypertension in pregnancy.[30],[31] The common side-effects of this drug are headache, nausea, and vomiting. According to a recently reported meta-analysis, hydralazine is less effective than labetalol for PIH in all aspects.[32] The recommended daily dose is 50–300 mg administered in 3–4 doses. Side-effects include hypotension and neonatal thrombocytopenia.

Calcium-channel blockers

Calcium-channel blockers can be of two subtypes: dihydropyridine (nifedipine) and non-dihydropyridine (verapamil, diltiazem). Nifedipine is considered safe to use in pregnancy.[33] Calcium-channel blockers other than the long-acting nifedipine should be used according to the physician’s evaluation after full explanation of the necessity for treating PIH and obtaining informed consent. Calcium-channel blockers have not been recommended in guidelines because of insufficient supporting evidence. The recommended starting dose for nifedipine is 10-20 mg (p.o., t.d.s.) with a maximum dose of 180 mg per day. The long-acting tablet formulation of nifedipine is usually dosed once daily starting at 30–60 mg and a maximum of 120 mg per day.[34] Recently, nimodipine (20–60 mg, p.o., b.d. or t.d.s.) and nicardipine (20–40 mg, p.o., t.d.s.) have been recommended for PIH by guidelines in China.

Beta-blockers (β-blockers)

Labetalol can blockade α1 adrenoreceptors to cause vasodilation. It has a greater β-blocking effect than α-blocking effect (3:1 ratio). Labetalol is first-line treatment for hypertensive disease during pregnancy. It is used in widely Europe, USA and China because it is considered safe.[35],[36] A meta-analysis demonstrated that labetalol has fewer adverse effects on maternal conditions than hydralazine.[32] Most β-blockers are contraindicated for pregnant women. Therefore, if administration of other β-blockers is necessary, then informed consent must be obtained after explaining the reasons of treatment.

Diuretics

Diuretics can lead to reductions in the pre-eclampsia-associated volume of: (i) circulating plasma; (ii) placental blood flow. Therefore, diuretics should be avoided in patients with pre-eclampsia. Diuretics can be used if pulmonary edema or heart-failure signs are absent.[37] For patients with chronic hypertension who take diuretics before pregnancy, the effect of reduction in placental blood flow is not apparent if the drug is continued after pregnancy. A commonly used diuretic is hydrochlorothiazide at a daily dose of 12.5–25 mg. Spironolactone is not recommended because it has been found to have an anti-androgenic effect during fetal development in animal models, though it does not seem to induce adverse outcomes in small cohorts of human participants.[38] We do not suggest spironolactone use in pregnant women, but it can be used only if a potassium-sparing diuretic is needed.

Alpha-blockers (α-Blockers)

α-Blockers are not contraindicated for pregnant women or those who may be pregnant, but use of α-blockers in this population should be avoided. Only one study has recommended using these drugs in pregnant women with hypertension secondary to pheochromocytoma.[39] Phentolamine is an α1 and α2 receptor agonist recommended for use in Chinese guidelines in 2015.

Renin aldosterone system (RAS) blockers

There are three types of RAS blockers: angiotensin-converting enzyme inhibitors, angiotensin-receptor blockers and direct inhibitors of renin. These drugs are strictly contraindicated in women who have been pregnant or are planning to become pregnant. Use of any RAS blocker can lead to teratogenicity and oligohydramnios during pregnancy.[40],[41]


  Emergency Treatment of PIH Top


Different countries have slightly different treatment strategies for PIH, but the common agents are labetalol (i.v.), hydralazine (i.v.), and nifedipine (p.o., s.l.).[23],[42] Nitroprusside is used rarely during pregnancy because it can increase the risk of cyanide intoxication in the fetus [Table 2].
Table 2: Drugs for PIH treatment in emergencies

Click here to view



  Conclusion Top


PIH increases eclampsia risk and threatens maternal and fetal health. In this review, we recommend treatment if BP ≥ 150/90 mmHg using labetalol, nifedipine, or methyldopa given as first-line agents via the oral route. In the setting of chronic hypertension, one agent should be administered at the highest dose before combination with another agent. Hypertension emergencies due to BP > 160/110 mmHg can result in maternal stroke or eclampsia. If delivery is imminent, parenteral therapy with labetalol (i.v.), hydralazine (i.v.) or nifedipine (p.o.) is indicated.

 
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Author contributions
Writing the manuscript: YL; supervising the study: YZ and YNJ; proofreading: WS. All authors approved the final version of this manuscript for publication.
Conflicts of interest
None declared.
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Plagiarism check
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Peer review
Externally peer reviewed.



 
 
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