criteria used to aid in the diagnosis of this condition include ( 1 ) vaginal bleeding accompanied by fetal heart irregularities , ( 2 ) vaginal blood determined to be of fetal origin , ( 3 ) palpation of vasoprevia through a dilated cervix , ( 4 ) visualization of vasoprevia through the amnioscope , and ( 5 ) marked fetal bradycardia when the membranes are unruptured and there is no evidence of vaginal bleeding .
C0015935
fetal heart
C0015965
fetal