Painless, bright red bleeding in the third trimester is the hallmark presentation of placenta previa. In this condition, the placenta is covering the cervical os. Any vaginal examination can cause catastrophic hemorrhage by disrupting the placenta. Therefore, the most important principle is to avoid any vaginal exams. While IV access is important, delivery is not always imminent (A). Fundal massage (B) and oxytocin (C) are interventions for postpartum hemorrhage, not antepartum bleeding from previa, and could worsen the situation.

This patient is presenting with eclampsia (preeclampsia + seizures). The first-line treatment to control the seizure and prevent recurrence is magnesium sulfate. While benzodiazepines like diazepam (B) can be used for refractory seizures, they are not the primary agent. Managing hypertension with labetalol (C) is important, but controlling the central nervous system irritability with magnesium is the priority. Calcium gluconate (D) is the antidote for magnesium toxicity, not the primary treatment for eclampsia.

In an entrapped head during a breech delivery, the immediate priority is to prevent fetal asphyxia. The Mauriceau-Smellie-Veit maneuver involves creating an airway for the infant by inserting fingers into the vagina and pressing the vaginal wall away from the infant's nose and mouth. This allows the infant to breathe while awaiting delivery of the head. Traction (A) can cause spinal injury. McRoberts maneuver (B) is for shoulder dystocia. Fundal pressure (D) is dangerous and can cause uterine rupture or worsen the entrapment.

This triad of sudden hypoxia, cardiovascular collapse, and coagulopathy (bleeding from IV site) immediately following rupture of membranes is the classic, albeit rare, presentation of an amniotic fluid embolism (AFE). While a massive PE (B) can cause similar respiratory and hemodynamic collapse, the profound coagulopathy is a key differentiator pointing to AFE. Eclampsia (A) involves seizures, and uterine rupture (D) typically presents with pain, cessation of contractions, and fetal distress, not this specific triad.

For a loose nuchal cord, the standard and safest procedure is to slip it over the infant's head before the body is delivered. This removes the potential for it to tighten during delivery of the shoulders. Clamping and cutting the cord (A) is reserved for cases where the cord is too tight to slip over the head and is impeding delivery. Stopping the delivery (B) is unnecessary. Allowing the cord to unwrap on its own (D) is risky as it could tighten and cause asphyxia.

Trauma in pregnancy, even if seemingly minor, carries a significant risk of abruptio placentae. The patient's tachycardia (HR 112) may be an early sign of compensation for blood loss, as pregnant patients can lose a significant amount of blood before becoming hypotensive. She requires extended fetal and maternal monitoring. Therefore, the most appropriate destination is a trauma center that also has obstetrical services. The closest hospital (A) may not have these capabilities. Refusal (C) is inappropriate due to the high-risk mechanism. Immobilization (D) is not indicated based on the information provided (ambulatory, no neurologic deficit or spinal pain).

In a multiple gestation pregnancy, there is a possibility of a shared placental circulation (monochorionic twins). If the cord of the first twin is clamped and cut, the second twin could hemorrhage into the delivered placenta and exsanguinate. Therefore, the safest practice is to leave the first cord intact until the second twin is ready to be delivered. This prevents potential harm in the case of a shared circulation. Applying traction (C) risks uterine inversion, and administering oxytocin (D) is not typically a field procedure in this context.

After initial maneuvers for shoulder dystocia fail, secondary maneuvers are indicated. Delivery of the posterior arm is a well-established and effective technique. By sweeping the posterior arm across the chest, the bisacromial diameter is reduced, often allowing the impacted anterior shoulder to be freed. Fundal pressure (A) is contraindicated. The Zavanelli maneuver (C) is an extreme, last-resort procedure performed in an operating room. Manipulating the head (D) can cause severe neck and nerve injury.

When you encounter third-trimester bleeding scenarios, focus on the classic presentation patterns that distinguish between the major causes of antepartum hemorrhage.

This patient's presentation screams abruptio placentae: the combination of dark red bleeding, severe constant "tearing" pain, and a rigid, tender uterus creates the classic triad. Abruptio placentae occurs when the normally implanted placenta prematurely separates from the uterine wall, causing bleeding that gets trapped behind the placenta and infiltrates the uterine muscle, making it board-like and extremely painful. The primary threats are maternal hemorrhagic shock (bleeding can be concealed and massive) and fetal hypoxia from placental separation.

Let's examine why the other options don't fit:

B) Placenta previa typically presents with painless, bright red bleeding and a soft, non-tender uterus. The pain and rigidity here rule this out.

C) Uterine rupture would likely show signs of fetal parts palpable abdominally, loss of fetal heart tones, and often occurs during labor with previous uterine scars. The intact uterine contour and third-trimester timing make this less likely.

D) Preterm labor involves regular uterine contractions with cervical changes, not the constant pain and rigidity described. The bleeding pattern doesn't match normal bloody show.

Remember this key distinction for the NREMT: abruptio placentae = pain + rigid uterus + dark bleeding, while placenta previa = painless + soft uterus + bright bleeding. The physical exam findings are your strongest differentiating factors in antepartum hemorrhage scenarios.

When the cord is felt ahead of the presenting part but the membranes are intact, the condition is called a cord presentation. It becomes a prolapsed cord once the membranes rupture. The key management is to prevent membrane rupture, which would cause the cord to prolapse and become compressed. Placing the mother in Trendelenburg or knee-chest position uses gravity to take pressure off the cervix. Rupturing membranes (A) would be iatrogenic and dangerous. It is not a nuchal cord (B) or vasa previa (C).