Preliminary data from two Women's Health Initiative trials that assessed factors that indicate increased risk of venous thromboembolism (VTE) with postmenopausal hormone therapy is now available. VTE refers to a blood clot that forms in the veins, usually in the legs. These clots can become fatal if they travel through the veins to the lung. According to the American Heart Association, more than 200,000 cases of VTE occur each year and 30 percent of these people die within three days. It is known that postmenopausal hormone treatments can double the risk of developing VTE, and in recent years hormone prescriptions have declined, partly as a result of this.
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