Which antihypertensive medicine is contraindicative in gestational hypertension?

JIPMER Nursing Officer - 2020

Pharmacology

Easy

Appeared in: JIPMER Nursing Officer - 2020

Explanation

Losartan is an Angiotensin II Receptor Blocker (ARB).
ARBs and ACE inhibitors are absolutely contraindicated in pregnancy because they disrupt the fetal renin-angiotensin-aldosterone system (RAAS).
This disruption can lead to severe fetal complications, including renal failure, oligohydramnios (low amniotic fluid), skull defects (hypocalvaria), and fetal death.
Due to these severe risks, any woman of childbearing potential on an ARB or ACE inhibitor should be counseled and switched to a safer alternative if planning pregnancy.

Option A: Nicardipine is a calcium channel blocker. This class of medication, including nifedipine, is considered safe and is frequently used to manage hypertension during pregnancy, especially severe cases.
Option C: This option is also correct, which makes the question flawed. Enalapril is an Angiotensin-Converting Enzyme (ACE) inhibitor. Like ARBs (Losartan), ACE inhibitors are absolutely contraindicated in pregnancy due to their teratogenic effects on the fetal kidneys and skull.
Option D: Atenolol is a beta-blocker. While it is generally avoided during pregnancy due to an association with fetal growth restriction, it is not considered as absolutely contraindicated as ACE inhibitors and ARBs. Other beta-blockers, like labetalol, are considered first-line therapy.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Contraindications of antihypertensive medications during pregnancy as background academic context rather than a clinical decision trigger.
It is a critical nursing responsibility to review the medication list of any woman of childbearing age, especially those with chronic conditions like hypertension.
Patient education is paramount. Nurses must ensure patients understand why certain medications are unsafe during pregnancy and the importance of preconception counseling to switch to safer alternatives.
A 'What if?' scenario: If a woman on Losartan for chronic hypertension discovers she is 8 weeks pregnant, the immediate nursing action is to advise her to contact her prescribing provider immediately to switch to a safer medication. The nurse should not advise her to stop the medication abruptly without medical consultation, as uncontrolled hypertension also poses risks.

How to Approach the Question

First, identify the drug class for each option: Nicardipine (Calcium Channel Blocker), Losartan (ARB), Enalapril (ACE Inhibitor), and Atenolol (Beta-Blocker).
Recall the safety profiles of these drug classes during pregnancy.
Remember that drugs acting on the Renin-Angiotensin-Aldosterone System (RAAS) are the most dangerous and are absolutely contraindicated. This includes both ACE inhibitors and ARBs.
Identify that both Losartan (ARB) and Enalapril (ACE inhibitor) fall into this contraindicated category.
Recognize that this makes the question flawed because there are two correct answers. In an exam, you must select the best option. Since both are equally contraindicated, either could be marked correct.
Evaluate the other options. Calcium channel blockers (Nicardipine) are generally safe. Beta-blockers (Atenolol) are used with caution, with labetalol being preferred over atenolol.

Concept Tested & Keywords

Concept Tested: Contraindications of antihypertensive medications during pregnancy
Stem keywords: antihypertensive medicine, contraindicative, gestational hypertension
Lead-in keywords: Which

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