What is the biggest cause of Maternal Mortality Rate (MMR)?

P.CHO-2019

Obstetrics & Gynaecology

Easy

Appeared in: P.CHO-2019

Explanation

Haemorrhage is the single most common cause of maternal death globally, accounting for about a quarter of all mortalities.
Postpartum Haemorrhage (PPH) is the most frequent type, defined as blood loss of 500 mL or more after vaginal delivery or 1000 mL or more after a caesarean section.
The primary cause of PPH is uterine atony, where the uterus fails to contract after delivery, leading to rapid and severe bleeding.
Most deaths from PPH are preventable with timely recognition and appropriate management, including uterotonic drugs and manual manoeuvres.

Option A: Twin pregnancy is a significant risk factor for maternal mortality, but it is not a direct cause of death. It increases the risk of complications like PPH (due to uterine overdistension), pre-eclampsia, and preterm labour.
Option B: Eclampsia, a severe complication of pre-eclampsia characterized by seizures, is a major cause of maternal death but is less common than haemorrhage. Hypertensive disorders of pregnancy account for approximately 13% of maternal deaths worldwide.
Option D: This option is incorrect because a primary cause of maternal mortality is listed among the choices.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Leading causes of Maternal Mortality Rate (MMR) as background academic context rather than a clinical decision trigger.
A nurse's ability to promptly recognize the signs of PPH (e.g., a boggy uterus, heavy vaginal bleeding) and initiate fundal massage and administer uterotonics is a critical life-saving skill.
Active Management of the Third Stage of Labour (AMTSL), which includes administering a prophylactic uterotonic (usually oxytocin), is a key evidence-based practice to prevent PPH.
What if? If a patient with PPH has a history of hypertension, the nurse should know that Methylergometrine (Methergine) is contraindicated, as it can cause a dangerous spike in blood pressure. Alternative uterotonics like Oxytocin or Misoprostol should be used.

How to Approach the Question

Identify the core question, which asks for the 'biggest' or leading cause of Maternal Mortality Rate (MMR). This requires recalling epidemiological facts about maternal health.
Evaluate each option's role in maternal death. Consider whether it is a direct cause or a risk factor.
Recall that haemorrhage is the number one direct cause of maternal death globally.
Differentiate between a risk factor (Twin pregnancy) and a direct cause (Haemorrhage, Eclampsia).
Compare the relative frequencies of the direct causes. Haemorrhage is statistically more common than eclampsia as a cause of death.
Select the option that represents the most frequent cause of maternal mortality.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 57-59

E6 Medicine Harrison 22e Part 2 p. 1808-1810