A multigravida at 39 weeks of gestation has been delivered to a hospital having a regular labor activity for 8 hours, the waters burst an hour ago. She complains of headache, seeing spots. AP is of 180/100 mm Hg. Urine test results: protein - 3,3 g/l, hyaline cylinders. Fetal heart rate is 140/min, rhythmical. Vaginal examination reveals complete cervical dilatation, the fetal head is on the pelvic floor, sagittal suture is in line with obstetric conjugate, the occipital fontanel is under the pubis. What is the optimal tactics of labour management?