Heparin when given In pregnancy should be supplemented with
**Core Concept**
Heparin is an anticoagulant that works by enhancing the activity of antithrombin III, a natural inhibitor of thrombin and factor Xa. In pregnancy, heparin is often used as an alternative to warfarin due to its safety profile.
**Why the Correct Answer is Right**
During pregnancy, the levels of antithrombin III decrease, which can lead to a decrease in the anticoagulant effect of heparin. To counteract this, heparin is supplemented with **vitamin K** (also known as **vitamin K1** or **phylloquinone**), which is necessary for the synthesis of clotting factors II, VII, IX, and X. Vitamin K supplementation helps to maintain the anticoagulant effect of heparin and prevent thrombosis.
**Why Each Wrong Option is Incorrect**
**Option A:** **Folic acid** is essential for fetal development, particularly in preventing neural tube defects, but it is not relevant to heparin supplementation in pregnancy.
**Option B:** **Vitamin C** is an antioxidant that has various health benefits, but it is not used to supplement heparin in pregnancy.
**Option C:** **Proton pump inhibitors** are used to reduce stomach acid and are not related to heparin supplementation in pregnancy.
**Clinical Pearl / High-Yield Fact**
When administering heparin to pregnant patients, it's essential to monitor their anticoagulant response closely and supplement with vitamin K as needed to prevent thrombosis.
**Correct Answer:** B. Vitamin K