Constriction ring dystocia

Recurrent Bandl's Ring as an Etiology for Failed Vaginal Birth after Cesarean Section

“…Because this ridge is thought to occur in the course of normal labor, it has been designated a physiological retraction ring. 4 When the thinning of the lower uterine segment is extreme, as in obstructed labor, the ring becomes prominent and is termed a pathologic retraction ring, also known as the ring of Bandl. 2 Much confusion has occurred regarding the terminology of uterine rings associated with obstructed labor.…”

The Lower Parts of the Uterus During the First Stage of Labour in Occipito ‐ Anterior Vertex Presentation

“…Increased resistance in the lower parts of the uterus during labour has been divided clinically into rigidity and spasm. Rigidity can be defined as an abnormally reduced ability of the tissue of the lower parts of the uterus to give way to the presenting part, while spasm may be defined as an abnormally increased contractility of the musculature; its most pronounced form, the contraction (constriction) ring dystocia (White, 1912, Rucker, 1927, Rudolph, 1935, Mc Kenzie, 1937 may in certain cases obstruct labour. In order to reduce the increased resistance of a rigid cervix, the cervical incision of Diihrssen was employed (Thordn, 1944).…”