Sinusoidal hea rate pattern is seen in:
Sinusoidal hea rate is observed in the antepaum period due to severe fetal anaemia as in Rh immunisation ,ruptured vasa prae or twin twin transfusion.It is rare in intrapaum period. Refer page no 521 of Text book of obstetrics,sheila balakrishnan,2 nd edition.
Placenta pre
Vasa pre
Battledore placenta
Succenturiate placenta
Diagnosis in obstetrics