Moreover, the registry does not provide specific information about the type of Vauum Extraction instrument used, level, position, and attitude of the fetal head in the pelvis when applying Vacuum Extraction, location of placement of the vacuum cup, traction work, skill of the obstetrician, pressure, exposure time and cup detachments. In addition, the register does not provide information about use of oxytocin and application of fundal pressure both increasing the axial pressure on the presenting part.