Table 1.
Risk of thrombotic complications in pregnancy.
| Thrombotic complication | Incidence or relative risk in pregnancy | Incidence in non-pregnant women | References |
|---|---|---|---|
| Deep venous thrombosis | 0.615/1000 (age <35) | 0.11–0.41/1000 | 6,7 |
| 1.216/1000 (age >35) | |||
| Pulmonary embolism | 0.33–1/1000 | 0–0.2/1000a | 7,8 |
| Cerebral infarction | RR 0.7 (antepartum) | 0.11/1000 | 9,10 |
| RR 8.7 (post-partum) | |||
| Artificial valve thrombosis | 39/1000 (warfarin)b | 3–13/1000b | 11,12 |
| 92/1000 (heparin)b | |||
| Myocardial infarction | 0.1/1000 | 0.05/1000 | 10,13 |
a
Age-dependent incidence (essentially zero incidence in women <18).
b
Incidence expressed in those with an artificial cardiac valve.