Neonatal alloimmune thrombocytopenia

Neonatal alloimmune thrombocytopenia
Synonyms	NAIT, Fetal and neonatal alloimmune thrombocytopenia (FNAIT)
Pronounce	N/A
Specialty	N/A
Symptoms	Petechiae, purpura, intracranial hemorrhage
Complications	Intracranial hemorrhage, severe thrombocytopenia
Onset	Neonatal
Duration	Varies
Types	N/A
Causes	Maternal antibodies against fetal platelet antigens
Risks	Previous pregnancy with NAIT, HPA-1a incompatibility
Diagnosis	Platelet count, maternal antibody testing, fetal blood sampling
Differential diagnosis	Immune thrombocytopenic purpura, congenital infections, genetic thrombocytopenia
Prevention	Intravenous immunoglobulin (IVIG) during pregnancy
Treatment	Platelet transfusion, IVIG, corticosteroids
Medication	N/A
Prognosis	Generally good with treatment
Frequency	1 in 1,000 to 1 in 5,000 live births
Deaths	N/A

Neonatal alloimmune thrombocytopenia (NAIT) is a rare disease that affects newborns, where the platelet count is reduced due to the mother's immune system attacking the baby's platelets. This condition can lead to severe bleeding and other complications in the newborn.

Causes

NAIT is caused by an incompatibility between the mother's and baby's blood. The mother's immune system produces antibodies that attack the baby's platelets, leading to a reduced platelet count. This is similar to the mechanism that causes Rh disease, but it involves platelets instead of red blood cells.

Symptoms

The most common symptom of NAIT is purpura, or purple or red spots on the skin caused by bleeding under the skin. Other symptoms can include bleeding from the nose or gums, blood in the urine or stool, or excessive bruising. In severe cases, NAIT can lead to intracranial hemorrhage, or bleeding in the brain, which can cause serious complications.

Diagnosis

NAIT is usually diagnosed through blood tests that show a low platelet count in the newborn. The mother's blood may also be tested for antibodies that can cause NAIT. In some cases, a sample of the baby's blood may be examined under a microscope to look for abnormalities in the platelets.

Treatment

Treatment for NAIT depends on the severity of the condition. Mild cases may not require treatment, while more severe cases may require platelet transfusions to increase the platelet count. In some cases, medications may be given to the mother during pregnancy to prevent NAIT in the newborn.

See also

• Thrombocytopenia
• Rh disease
• Platelet transfusion

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