During partograph monitoring of a 32-year-old multiparous woman in active labor, the cervical dilation curve crosses the action line. What is the most common indication for intervention at this point?

Explanation

## Action Line Crossing and Intervention Criteria **Key Point:** The most common indication for intervention when the action line is crossed is **arrest of cervical dilation for ≥2 hours** (in the presence of adequate contractions), which represents true obstructed labor or cephalopelvic disproportion. ### Partograph Alert vs. Action Lines ```mermaid flowchart TD A[Cervical dilation plotted on partograph]:::outcome --> B{Crosses alert line?}:::decision B -->|Yes| C[Assess position, contractions, descent]:::action B -->|No| D[Continue observation]:::action C --> E{Correctable with oxytocin?}:::decision E -->|Yes| F[Augment labor]:::action E -->|No| G{Crosses action line?}:::decision G -->|Yes| H[Arrest ≥2 hrs with adequate contractions]:::outcome H --> I[Cesarean delivery indicated]:::urgent G -->|No| J[Continue partograph]:::action ``` ### Definition and Timing | Line | Timing | Meaning | Action | |------|--------|---------|--------| | **Alert line** | Crosses when dilation is slower than expected (1 cm/hr in primigravidas) | Slow progress; investigate | Assess position, contractions; augment if appropriate | | **Action line** | Placed 2–4 hours to the right of alert line | Indicates arrest or severe delay | **Cesarean delivery** (if adequate contractions present) | **High-Yield:** The action line crossing with **arrest of cervical dilation ≥2 hours in the presence of adequate uterine contractions** (≥3 contractions in 10 minutes, each lasting ≥40 seconds) is the most common and most important indication for intervention because it signals true obstructed labor. ### Clinical Pearl Before crossing the action line mandates cesarean delivery, ensure that: 1. **Contractions are adequate** — if not, augment with oxytocin first. 2. **Fetal position has been assessed** — malposition may be correctable. 3. **Maternal and fetal condition are reassuring** — if either is compromised, intervene earlier. In multiparous women, the action line may be crossed more readily because they tolerate prolonged labor better, but arrest ≥2 hours with good contractions still indicates obstruction. **Warning:** Do not confuse the alert line (investigation) with the action line (intervention). Crossing the action line with adequate contractions and no descent is the most common reason for operative delivery in partograph-monitored labor.