OBSbasic
Describe the four placenta praevia types in the classification supplied in the lecture.
Answer
Type I: the placenta encroaches on the lower uterine segment but does not reach the internal os. Type II: it reaches the internal os but does not cover it. Type III: it partially occludes the internal os but does not completely cover it. Type IV: the internal os is fully covered.
Explanation
The four categories are based on the placental edge’s relationship to the **internal os**. Types I and II do not cover the os; Type III partially covers it; and Type IV fully covers it. This is the classification used in the supplied lecture material.\n\n**Key takeaway:** The classification distinguishes proximity to the os from partial or complete coverage.\n\n**Glossary:** **Placenta praevia**: Placental implantation in the lower uterine segment; **internal os**: The upper opening of the cervix; **occlude**: To block or cover.
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