Placental Malaria and Fetal Outcomes in Pregnancy
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Direct answer
Malaria in pregnancy increases the risk of severe disease and placental infection, mainly from Plasmodium falciparum, and it causes anaemia, low birth weight and stillbirth. Treatment depends on the trimester, with quinine plus clindamycin preferred in the first trimester and an artemisinin-based combination therapy used later. Primaquine is avoided in pregnancy, and WHO advises intermittent preventive treatment with sulfadoxine-pyrimethamine from the second trimester in high-transmission areas.
What you must remember
- Placental malaria: Infected red cells sequester in the intervillous space, causing inflammation, low birth weight and fetal growth restriction.
- Vulnerable women: Primigravidae and secundigravidae are most affected, because partial immunity builds with repeated pregnancies.
- Severe malaria: Intravenous artesunate is preferred; hypoglycaemia, acute kidney injury, pulmonary oedema and cerebral malaria are typical complications.
- First trimester: Quinine plus clindamycin for seven days is the preferred treatment for uncomplicated falciparum malaria.
- Second and third trimesters: An artemisinin combination therapy is used for uncomplicated falciparum malaria; WHO names artemether-lumefantrine, while India's national programme has used artesunate plus sulfadoxine-pyrimethamine (artemether-lumefantrine in the north-eastern states).
- Vivax malaria: Chloroquine is used where it remains effective; radical cure with primaquine waits until after delivery and G6PD testing.
- Intermittent preventive treatment: Sulfadoxine-pyrimethamine at scheduled antenatal visits from the second trimester, not in the first.
- Primaquine: Avoided in pregnancy because of haemolysis risk in G6PD-deficient mothers and fetuses.
Treatment by trimester, step by step
Treatment depends on the trimester and on whether the infection is severe, and the table sets out the usual WHO choices; national drug policy may differ. Diagnosis rests on microscopy or a rapid diagnostic test, and a negative result in a symptomatic woman should be repeated.
| Trimester or setting | Preferred treatment | Key point |
|---|---|---|
| First trimester | Quinine plus clindamycin for seven days | Avoid sulfadoxine-pyrimethamine prophylaxis |
| Second trimester | Artemisinin combination (for example artemether-lumefantrine) | WHO intermittent preventive treatment starts where used |
| Third trimester | Artemisinin combination (for example artemether-lumefantrine) | Check haemoglobin and parasite clearance |
| Severe disease, any trimester | Intravenous artesunate | Monitor glucose, kidney function and parasitaemia |
Prevention combines insecticide-treated nets with intermittent preventive treatment. Anaemia must be treated alongside, because it compounds the harm caused by infection.
Parasite clearance is checked after treatment, and a woman with malaria near delivery needs the newborn examined for congenital malaria, which is uncommon but recognised. Hypoglycaemia is a particular risk in pregnant women with severe disease, so blood glucose is checked repeatedly during treatment.
Where the examiner tries to catch you
Viva questions usually test trimester-based drug choice and the avoidance of primaquine.
- Trap: Prescribing primaquine in pregnancy for vivax malaria Correct: Radical cure is delayed until after delivery, once G6PD status is known.
- Trap: Giving sulfadoxine-pyrimethamine in the first trimester for prophylaxis Correct: Intermittent preventive treatment starts in the second trimester, because of concern about folate antagonism early in pregnancy.
- Trap: Treating severe falciparum malaria with oral quinine Correct: Severe disease needs intravenous artesunate, with glucose and renal monitoring.
Frequently asked questions
Which antimalarial is used for uncomplicated falciparum malaria in the first trimester?
Quinine plus clindamycin is the preferred treatment for uncomplicated falciparum malaria in the first trimester, given for seven days. An artemisinin combination, such as artemether-lumefantrine, is used from the second trimester onwards.
Why is primaquine avoided in pregnancy?
Primaquine is avoided in pregnancy because it can cause haemolysis, particularly in G6PD-deficient mothers and fetuses. Radical cure for Plasmodium vivax is therefore delayed until after delivery, once G6PD status is known.
When is intermittent preventive treatment with sulfadoxine-pyrimethamine given?
Intermittent preventive treatment with sulfadoxine-pyrimethamine is a WHO strategy for high-transmission areas, given from the second trimester at scheduled antenatal visits; it is not routine national policy in India. It is avoided in the first trimester because sulfadoxine-pyrimethamine acts as a folate antagonist.
Why is severe falciparum malaria in pregnancy treated with intravenous artesunate?
Intravenous artesunate is preferred for severe falciparum malaria in pregnancy because it acts faster than quinine and is the WHO-recommended choice. Glucose, renal function and parasite load must be monitored closely during treatment.