Table 1.

Causes of severe postpartum hemorrhage (N = 1064)

Causea
Tone	671 (63.0%)
Uterine atonyb   Uterine inversion   Abruption of placenta	643 (60.4%) 5 (0.5%) 23 (2.2%)
Tissue	380 (35.7%)
Retained placenta   Retained placental tissue   Abnormal placentation (accreta, increta, percreta)	211 (19.8%) 122 (11.4%) 47 (4.4%)
Trauma	189 (17.8%)
Birth canal trauma	114 (10.7%)
Surgical trauma during caesarean delivery	63 (5.9%)
Uterine rupture	12 (1.1%)
Thrombin	16 (1.5%)
Disseminated intravascular coagulation	8 (0.8%)
Pre-existing coagulation disorders	8 (0.8%)

Data presented as n (%)

^a23% of the cases had two major causes listed

^bexcluding cases with atony due to retained placental tissue