**Question:** In classical caesarean section more chances of rupture of uterus is in:

A. emergency procedure
B. high-order pregnancies
C. twin pregnancy
D. scarred uterus from previous cesarean section

**Core Concept:**

Classical caesarean section is a surgical procedure performed to deliver a fetus through an incision that extends from the umbilicus (belly button) to the pubic symphysis, involving the lower uterine segment, internal os, cervix, and vagina. The decision for a classical cesarean section depends on factors like maternal and fetal health conditions, previous cesarean section scars, and the obstetric history.

**Why the Correct Answer is Right:**

More chances of uterus rupture in a **D. scarred uterus from previous cesarean section** are due to the inherent risks associated with surgery on previously scarred tissue. The uterus has become weaker from the previous incision, and the risk of rupture during subsequent cesarean sections increases.

When performing a classical cesarean section on a patient with a history of previous cesarean section, the risk of uterine rupture is higher compared to other options.

**Why Each Wrong Option is Incorrect:**

- **A. emergency procedure**: Although emergency cesarean sections carry risks, uterine rupture is not significantly more common in them compared to elective procedures. The main focus in an emergency should be on ensuring maternal and fetal safety.

- **B. high-order pregnancies**: The number of previous pregnancies does not directly determine the risk of uterine rupture in a classical cesarean section. The risk depends on the specific factors mentioned above (e.g., uterine scarring from previous surgery).

- **C. twin pregnancy**: Having twins does not inherently increase the risk of uterine rupture in a classical cesarean section, unless there are additional risk factors present.

**Clinical Pearl:**

In cases where the patient has a history of previous cesarean section and is pregnant again, it is crucial to consider the risk of uterine rupture when planning the delivery method. A classical cesarean section should be performed carefully in these cases, preferably in an elective setting, to minimize the risk of catastrophic complications like uterine rupture.