Common cause of retained placenta:
Ans. is a, i.e. Atonic uterusRef. JB Sharma Obs, Pg 343M/C cause of retained placenta is a simply adherent placenta. This is due to mainly atonic uterus.
Atonic uterus
Constriction ring
Placenta accreta
Poor voluntary expulsive effort
Complication of 3rd Stage of Labour