What is the bleeding pattern in placenta praevia?

NHM UP Staff Nurse-2023 shift 1st

Obstetrics & Gynaecology

Easy

Appeared in: NHM UP Staff Nurse-2023 shift 1st

Explanation

The hallmark sign of placenta previa is painless vaginal bleeding.
The blood is bright red because it is fresh arterial bleeding from the separated uteroplacental sinuses near the cervix and escapes immediately without being retained or clotted.
The bleeding is often described as causeless (spontaneous) and recurrent, with the first episode (sentinel bleed) usually being less severe than subsequent ones.

Option A: Dark red blood indicates old, retained blood that has had time to deoxygenate and clot. In placenta previa, the blood escapes immediately, so it is bright red.
Option C: This combination is the classic presentation of abruptio placentae (placental abruption). The pain is caused by blood accumulating behind the placenta, irritating the myometrium, and the blood appears dark because it is retained.
Option D: While the bleeding in placenta previa is bright red, it is characteristically painless. The presence of pain would strongly suggest another diagnosis, such as placental abruption or uterine rupture.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Clinical presentation of placenta previa as background academic context rather than a clinical decision trigger.
A critical nursing intervention for any pregnant woman presenting with vaginal bleeding is to NEVER perform a digital vaginal examination until placenta previa has been ruled out by ultrasound. A vaginal exam can puncture the placenta and cause catastrophic hemorrhage.
Nursing management for a patient with known or suspected placenta previa includes strict bed rest (if ordered), continuous fetal monitoring, monitoring maternal vital signs and blood loss (pad count), and maintaining IV access for potential fluid or blood product administration.
What if? If a patient with known placenta previa starts experiencing painful, board-like abdominal rigidity along with bleeding, the nurse should suspect a concurrent placental abruption, which can occur, and immediately notify the provider as this is a double emergency requiring urgent delivery.

How to Approach the Question

First, identify the key terms in the question: 'bleeding pattern' and 'placenta praevia'.
Recall the classic signs and symptoms of placenta previa. The mnemonic 'PREVIA' can be helpful: Painless, Red blood, External bleeding, Vital signs may be stable initially, Intermittent episodes, Abnormal fetal lie.
Analyze the options based on two main characteristics: presence or absence of pain, and the color of the blood (bright red vs. dark red).
Eliminate options with 'painful' as placenta previa is characteristically painless.
Differentiate between 'bright red' and 'dark red' bleeding. Bright red signifies fresh, active bleeding that is escaping the body quickly, which is typical for previa. Dark red implies old, retained blood, which is more characteristic of a concealed abruption.
Select the option that combines 'painless' and 'bright red bleeding' as the correct description for placenta previa.

Concept Tested & Keywords

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E6 Obstetrics Williams pp. 68-93, 71-95

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 19-27