How long would you anticoagulate for PE developed after air travel in a woman on an estrogen-containing vaginal ring for contraception?  

This patient has two transient (“provoking”) factors that may have contributed to her pulmonary embolism (PE): the use of estrogen-containing contraception and, presumably, a recent long-haul air travel. Traditionally, it has been assumed that, after three months of treatment for the ini...