Cause of painless bright coloured vaginal bleeding after 24 weeks suggest to?

NORCET 3 - 2022 (Shift-2)

Obstetrics & Gynaecology

Easy

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

Placenta Previa because it classically presents with painless, bright red vaginal bleeding in the second or third trimester.
This presentation occurs because the placenta is implanted in the lower uterine segment, and as the cervix begins to efface and dilate, the placental vessels tear, causing bleeding.
The bleeding is from the maternal circulation and is typically not associated with uterine pain or tenderness, as there is no significant uterine muscle irritation from concealed blood.
The onset of bleeding is often spontaneous and can be recurrent throughout the later stages of pregnancy.

Option B: Abruptio placenta is incorrect because it is characterized by sudden, severe, and constant abdominal pain along with vaginal bleeding.
Option C: Abortion is incorrect because it is defined as the termination of pregnancy before 20 weeks of gestation. The question specifies bleeding after 24 weeks.
Option D: Vasa previa is a less likely answer because, while the bleeding is painless and bright red, it classically occurs immediately following the rupture of membranes and is associated with acute fetal distress (like severe bradycardia), as the bleeding is from fetal vessels.

Visual 1: Diagram - An illustration showing the different types of placenta previa (low-lying, marginal, partial, and complete) to help visualize how the placenta's position over the cervical os leads to bleeding.
Visual 2: Comparison Chart - A chart visually comparing the key signs and symptoms (pain, blood color, uterine tone) of placenta previa, abruptio placentae, and vasa previa for easy differentiation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Differential diagnosis of antepartum hemorrhage in the third trimester as background academic context rather than a clinical decision trigger.
The most critical nursing action for suspected placenta previa is to AVOID any vaginal examinations until an ultrasound confirms the placental location. A digital exam can cause life-threatening hemorrhage.
Nurses must be prepared for a potential obstetric emergency, including establishing IV access for fluid and blood product administration and preparing for an emergency cesarean section.
Patient education is vital. The woman and her family must understand the importance of pelvic rest (no intercourse, no douching) and the need for immediate transport to the hospital if bleeding recurs.

How to Approach the Question

First, analyze the key descriptors in the question stem: 'painless', 'bright coloured', and 'after 24 weeks'.
Consider each option in light of these descriptors.
Recall the classic presentation of placenta previa: painless, bright red bleeding in the third trimester. This is a direct match.
Evaluate the distractors. Rule out 'Abortion' based on the gestational age (>24 weeks vs. <20 weeks).
Differentiate from 'Abruptio placenta' by the absence of pain. Abruption is typically painful.
Differentiate from 'Vasa previa' by the context. Vasa previa bleeding is linked to rupture of membranes and acute fetal distress, which are not mentioned here.

Concept Tested & Keywords

Concept Tested: Differential diagnosis of antepartum hemorrhage in the third trimester.
Stem keywords: painless, bright coloured vaginal bleeding, after 24 weeks
Lead-in keywords: suggest to
Clinical cues: The combination of 'painless' and 'bright red' bleeding after mid-pregnancy is a classic presentation that strongly points towards a specific diagnosis.

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