From a study of the pathology of accidental
haemorrhage several very definite features are noted
in the uterus in all well marked cases. These are: -
(1) The presence of numerous haemorrhages in
the myometrium. These exist chiefly in
the outer half but are constantly present
to some extent in the inner half and in the
(2) That associated with this there is necrosis
of muscle cells and that some observers have
noted these in areas widely separated from
(3) That there is evidence of vascular damage.
In many cases there is very extensive thrombosis
of the veins of the uterus and broad
(4) Placental infarctions are frequently present
These would all seem to indicate that some toxic poison
or process is operating and that this poison would
seem to have some specific effect on the blood vessels.
It is also evident that in any given case there may b4
observed as part of the same process, placental infarction,
retroplacental haemorrhage - revealed or
concealed, thrombosis of the uterine and other pelvic
veins, and also intra- uterine haemorrhages.