North American Registry of Midwives (NARM) Practice Exam

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What typically causes variable decelerations in the fetal heart rate pattern?

  1. Maternal anxiety

  2. Cord compression

  3. Uteroplacental insufficiency

  4. Fetal movements

The correct answer is: Cord compression

Variable decelerations in the fetal heart rate pattern are primarily caused by cord compression. This phenomenon occurs when the umbilical cord becomes compressed during labor, often due to factors like fetal position, uterine contractions, or maternal positioning. When the cord is compressed, it can temporarily restrict blood flow and oxygen delivery to the fetus, leading to a noticeable decrease in the fetal heart rate during contractions. The deceleration often appears as abrupt drops in the heart rate that can vary in timing and depth, hence the name "variable." Understanding that cord compression is the key factor in variable decelerations is crucial for midwives and other healthcare providers, as it informs their monitoring and management decisions during labor. Recognizing the signs of cord compression allows for timely interventions to optimize fetal outcomes and enhance labor safety.