## Partograph Interpretation in Active Labour ### Understanding the Alert and Action Lines **Key Point:** The partograph is a graphical tool that plots cervical dilatation against time to identify labour abnormalities early. The WHO partograph uses: - **Alert line:** Drawn from 4 cm at 0 hours to full dilatation, representing a minimum acceptable rate of **1 cm/hour** in active labour. - **Action line:** Parallel to the alert line but displaced **4 hours to the right**. Crossing this line mandates intervention. ### Analysis of This Case | Parameter | Value | Assessment | |-----------|-------|------------| | Initial dilatation | 4 cm | Active phase begins | | Time elapsed | 4 hours | Standard interval | | Final dilatation | 5 cm | Rate = 0.25 cm/hour | | Alert line at 4 hours | 8 cm (4 + 1×4) | Patient is well behind | | Action line at 4 hours | 4 cm (alert line – 4 hrs) | Patient has crossed action line | **High-Yield:** The alert line on the WHO partograph represents **1 cm/hour** of cervical dilatation in active labour (not 0.5 cm/hour). Starting at 4 cm, the alert line reaches 8 cm at 4 hours. This patient dilated only to 5 cm in 4 hours (0.25 cm/hour), placing her **to the right of the action line** (which at hour 4 corresponds to 4 cm dilatation — i.e., no progress beyond the starting point is acceptable by 4 hours post-alert-line). Since the patient's progress point (5 cm at 4 hours) lies to the right of the action line, labour has crossed the action line. ### Why Option A is Correct The patient's cervical dilatation of 5 cm at 4 hours is significantly behind the alert line (expected 8 cm) and has crossed the action line. This situation — labour crossing the action line — is associated with possible **cephalopelvic disproportion (CPD)**, obstructed labour, or uterine inertia, and **requires immediate evaluation and intervention** (reassess for CPD, consider augmentation or operative delivery as appropriate). **Clinical Pearl (Park's Textbook of Preventive & Social Medicine / WHO Partograph Guidelines):** When the cervicograph crosses the action line, immediate obstetric review is mandatory. Causes include CPD, malposition, inadequate uterine contractions, or obstructed labour. Intervention options include amniotomy, oxytocin augmentation, or caesarean section depending on clinical findings. ### Why Other Options Are Incorrect - **Option B:** "Along the alert line" is incorrect — the patient is far behind the alert line (5 cm vs. expected 8 cm at 4 hours). - **Option C:** Labour is clearly not faster than the alert line. - **Option D:** While the action line has been crossed, option A more precisely describes the clinical implication (possible CPD) that best characterises the partograph finding in context. > **Note:** Option D states "crossed the action line and requires immediate intervention" — this is also factually accurate. However, option A specifically contextualises the finding with the clinical implication of CPD, which is the standard teaching point when the action line is crossed in a primigravida with slow progress. Between A and D, option A is the more complete and clinically precise answer as it links the partograph finding to its obstetric significance.
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.