How are Montevideo units (MVUs) calculated?

Montevideo units (MVUs) are calculated as a quantitative measure used to assess uterine contractions during labor. Specifically, MVUs are derived by measuring the strength of uterine contractions over a specified time period, typically using intrauterine pressure monitoring.

To calculate MVUs, peak contraction pressure is measured, and then the baseline uterine pressure is subtracted from this peak pressure to determine the pressure generated during each contraction. This process is repeated for all contractions occurring within a 10-minute period, and the total of these differences is what constitutes the MVUs. This calculation helps in evaluating the effectiveness of labor contractions in promoting cervical dilation and facilitating delivery.

Understanding MVUs is critical in midwifery, as they are used to monitor the labor process and can reveal whether the contractions are sufficient for active labor and if interventions might be necessary. The other options presented do not relate to the assessment of contraction strength and frequency in the same manner as MVUs, which specifically focus on intrauterine pressure changes during contractions.