Which of the following is a stressor that can affect acid-base status in labor?

The active phase of labor is characterized by a significant increase in the intensity and frequency of contractions, leading to greater maternal stress and physiological changes. During this phase, the fetus is also subjected to the increased pressure and could experience changes in its heart rate and oxygenation levels. As a result, both maternal and fetal acid-base status can be impacted.

Increased contractions can lead to reduced uterine and placental blood flow, which may cause fetal hypoxia. This, in turn, can result in metabolic changes, such as lactic acidosis, affecting the acid-base balance. Monitoring during this phase is crucial because deviations from normal acid-base status can indicate fetal distress, necessitating prompt intervention.

Understanding the active phase as a stressor emphasizes the need for careful fetal monitoring to ensure both maternal and fetal well-being throughout labor.