In truth there is not good evidence that low dose aspirin prevents VTE but we know that it helps to

The complication we wish to prevent is that of formation of blood clots in the veins of the legs (Deep Vein Thrombosis, or DVT) and movement of such clots to the lungs (Pulmonary Embolus, or PE). Because doctors love acronyms, we call DVTs and PEs VTE – Venous Thrombo-Embolism.
One of the many physiological changes that occurs during pregnancy is that your blood becomes hyper coagulable – or clots more readily – than when you are not pregnant. In plain English, your blood is thicker than when you are not pregnant. This is a very important adaptation in that it limits bleeding from the womb after your placenta (afterbirth) has detached from the wall of your womb once your baby has been born. The combination of contraction of the muscle ambassador hotel bangkok fibres after the birth of the placenta and the relative thickness of the blood are the physiological mechanisms that prevent excessive bleeding after you have given birth.
However the downside of having thicker ambassador hotel bangkok blood during pregnancy is that it is more likely to form blood clots within your blood vessels ambassador hotel bangkok during (or up to six weeks after) your pregnancy. The fact that you have a big lump in your pelvis (your pregnancy) that can compress the veins of your pelvis does not help because such compression causes slowing of blood flow (stasis) in your leg veins, which can also lead to clot formation.
If that wasn’t enough to worry about, some pregnant women have particular predispositions towards clot formation that can increase their risk of clot formation. Pregnant women with an increased risk of clots during pregnancy can include those with:
Of course most women who have suffered the above complications are not particularly at risk of clots, although some are. Those particularly at risk often have some form of subtle alteration in their clotting systems that make them at increased risk of both clots and the pregnancy complications listed above. These conditions can be familial. They include (long name warning!):
Because of the rarity of blood clots even occurring during pregnancy, there is limited evidence upon which to base advice regarding prevention of VTE during pregnancy. ambassador hotel bangkok The following advice represents my amalgam of the existing evidence and current recommendations by organisations such as the British, American, Australian and NZ Colleges of Obstetricians and Gynaecologists.
In truth there is not good evidence that low dose aspirin prevents VTE but we know that it helps to prevent arterial (as opposed to venous) clots, it thins the blood a little, and is safe during pregnancy