Can we identify risk factors during pregnancy for thrombo-embolic events during the puerperium and later in life?

Objectives: To investigate parturients at risk to develop venous thrombo-embolic events (VTE) in the puerperium or later in life, during a follow-up of more than a decade and compare risk factors for VTE during the puerperium with VTE later in life. Methods: A nested case-control study was conducted to profile parturients at risk for VTE and a secondary analysis to compare risk factors for VTE during or after puerperium. We used a cohort of 95257 women who gave birth between the years 1988 and 1998. Results: Independent risk factors to develop VTE were peripartum hysterectomy, stillbirth, cesarean delivery (CD), obesity, pregnancy-related hypertension, grandmultiparity and advanced maternal age. Women undergoing CD and those receiving blood transfusion were more likely to develop early versus late VTE (OR=2.0, 95% CI=1.15-3.5 and OR=11.0, 95% CI=2.25-55.5; respectively). Patients that encountered VTE during the puerperium had more pulmonary emboli and less deep vein thrombosis, compared with the late VTE group (p<0.001). Conclusions: Maternal age, grandmultiparity, pregnancy-related hypertension, CD, obesity, stillbirth and peripartum hysterectomy are independent risk factors for the development of VTE. CD and blood transfusion were predictive of early versus late VTE.