Increased lipid levels that result during pregnancy increase the mother's and fetus's risk for atherosclerosis later in life.

Question

BlackTom AI · Accepted Answer

Physiologic pregnancy causes marked, but transient, hyperlipidemia: triglycerides often rise two- to three-fold, total cholesterol and LDL increase by roughly 25–50%, and HDL usually increases as well, with peak changes in the third trimester. These changes reflect hormonal shifts (increased estrogen and progesterone), increased hepatic lipoprotein production, and the maternal metabolic adaptations that supply lipids for placental steroid synthesis and fetal development.

Step-by-step reasoning:
1. Identify relevant physiology: Pregnancy-induced hyperlipidemia is a normal, adaptive state. The placenta and fetus require lipids, and maternal metabolism shifts toward increased lipogenesis and lipoprotein production.
2. Time course and magnitude: Triglycerides ↑ ~2–3×, LDL and total cholesterol ↑ ~25–50%, HDL ↑ — these peak late in pregnancy and then decline postpartum.
3. Mechanism limiting fetal exposure: The placenta regulates lipid transfer; much fetal cholesterol is synthesized de novo. The transient maternal elevations do not equate to continuous exposure of fetal arteries to atherogenic lipoproteins.
4. Atherosclerosis pathogenesis: Atherosclerosis is a chronic process requiring long-term exposure to sustained risk factors (persistent dyslipidemia, hypertension, smoking, diabetes). A short-term, physiologic lipid rise that resolves after delivery does not provide the chronic insult needed to produce clinically meaningful atherosclerotic disease in mother or fetus.
5. Exceptions and nuances: Pathologic states—familial hypercholesterolemia, severe hypertriglyceridemia, preeclampsia, or gestational diabetes—can be associated with persistent dyslipidemia and increased long-term maternal cardiovascular risk. These are not the same as normal physiologic lipid changes.

Why “True” is incorrect: It treats physiologic, temporary lipid elevations as if they were persistent, pathologic risk factors. Evidence and mechanisms show that normal pregnancy lipid changes are reversible and do not by themselves produce long-term atherosclerosis risk for mother or child.

Conclusion: The correct answer is False, consistent with the provided answer.

Increased lipid levels that result during pregnancy increase the mother's and fetus's risk for atherosclerosis later in life.单项选择题

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