Inpatient Obstetric Nursing Examination – Rationale Samples

Question

A woman in labor is having contractions about every two to three minutes. She is 7–8 cm dilated, 100% effaced, and at a +1 station. These findings are most consistent with what stage of labor?

  • First
  • Second
  • Third

Rationale

The woman described is in the first stage of labor which is defined as the onset of labor until full dilatation. Second stage is full dilatation until birth of the baby. The third stage of labor is from birth of the baby until expulsion of the placenta. Many people confuse the stages of labor with the phases that define the first stage of labor according to Freidman.

Question

Magnesium sulfate is thought to be useful as a tocolytic because it

  • enhances calcium transport across cell walls
  • facilitates calcium excretion
  • keeps calcium extracellular to the myometrial cell

Rationale

The mechanism of action of magnesium sulfate as a tocolytic is not clearly understood. Researchers believe that excess magnesium causes a decrease in the net calcium available to the myometrial cells, which in turn leads to an interference of muscle contractility.