During active labour cervical dilatation per hour in primi is: .
**Core Concept**
Active labour in primigravidae (primi) is characterized by a steady progression of cervical dilatation, which is crucial for assessing the pace of labour. The normal rate of cervical dilatation during active labour is influenced by various physiological factors, including uterine contractions and fetal head descent.
**Why the Correct Answer is Right**
The correct answer reflects the widely accepted rate of cervical dilatation during active labour in primigravidae. This rate is typically around 1 cm/hour, as it allows for a balanced progression of labour without excessive uterine contractions or prolonged labour. The uterine contractions during active labour are coordinated to facilitate cervical dilatation, and a rate of 1 cm/hour is considered normal.
**Why Each Wrong Option is Incorrect**
**Option A:** A rate of 0.5 cm/hour is too slow, indicating a potential issue with uterine contractions or fetal head descent.
**Option B:** A rate of 2 cm/hour is too fast, which may lead to uterine exhaustion or fetal distress.
**Option C:** A rate of 1.5 cm/hour is still within the normal range but is less specific than the correct answer.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the rate of cervical dilatation during active labour can vary between 0.5-2 cm/hour, but a rate of 1 cm/hour is generally considered normal for primigravidae.
**Correct Answer: C. 1 cm/hour.**