Which of the following is NOT an advantage of low molecular weight heparin over unfractionated heparin ?
**Core Concept**
Low molecular weight heparin (LMWH) is a type of anticoagulant that is derived from unfractionated heparin (UFH). It has a smaller molecular weight and a more predictable anticoagulant effect compared to UFH. The pharmacological properties of LMWH make it a preferred choice over UFH in certain clinical situations.
**Why the Correct Answer is Right**
LMWH has several advantages over UFH, including a more predictable anticoagulant effect, reduced risk of heparin-induced thrombocytopenia, and a lower risk of bleeding complications. The fixed dosing regimen of LMWH also makes it easier to administer compared to UFH, which requires continuous infusion and monitoring of activated partial thromboplastin time (aPTT).
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because LMWH has a more predictable anticoagulant effect compared to UFH, which makes it easier to administer and reduce the risk of bleeding complications.
* **Option B:** This option is incorrect because LMWH has a lower risk of heparin-induced thrombocytopenia compared to UFH, which is a serious side effect that can occur with UFH.
* **Option C:** This option is incorrect because LMWH is often administered subcutaneously, which is a more convenient and less painful route of administration compared to UFH.
**Clinical Pearl / High-Yield Fact**
One of the key differences between LMWH and UFH is their dosing regimen. LMWH is typically administered once or twice daily, whereas UFH requires continuous infusion and monitoring of aPTT. This makes LMWH a more convenient and easier-to-administer option in many clinical situations.
**Correct Answer: B. LMWH does not require continuous infusion and monitoring of aPTT.**