Abstract
Pregnancy appears to increase the risk of thromboembolism sixfold, but there are wide variations in the reported incidence of thromboembolic complications during pregnancy. This is due to diagnostic difficulties and the inculsion of various clinical entities within the disease classification. However, there are reliable data on the incidence of fatal pulmonary thromboembolism (PTE) due to the detailed and thorough reports of the confidential enquiries into Maternal Deaths in England and Wales.