Which of the following findings indicates a client who is in a trial of labor for vaginal birth after cesarean (VBAC) may be experiencing a uterine rupture?

Choice A reason: Palpation of the fetal presenting part in the cervical os indicates labor progression or malpresentation, not uterine rupture. Uterine rupture involves uterine wall tearing, causing hemorrhage or fetal extrusion, not cervical findings. This finding is unrelated to the catastrophic internal bleeding or placental disruption characteristic of rupture. Choice B reason: Severe bradypnea (respiratory rate of 10/min) is not a primary sign of uterine rupture. Rupture causes hemorrhage, leading to hypovolemic shock with symptoms like hypotension or tachycardia. Respiratory changes may occur secondary to shock but are not specific. Uterine rupture primarily affects cardiovascular stability, not respiratory rate. Choice C reason: A sudden gush of amniotic fluid indicates membrane rupture, a normal labor event, not uterine rupture. Uterine rupture involves uterine wall tearing, causing bleeding or fetal distress, not fluid release. Amniotic fluid loss is unrelated to the structural failure or hemorrhagic shock associated with uterine rupture in VBAC. Choice D reason: Hypotension (85/40 mm Hg) indicates uterine rupture, as it suggests hypovolemic shock from internal hemorrhage due to uterine wall tearing. Blood loss reduces intravascular volume, impairing cardiac output and placental perfusion. This life-threatening sign in VBAC requires immediate intervention to address maternal and fetal compromise, aligning with rupture’s pathophysiology.