NEET MDS

The Power Course

In Hereditary spherocytosis



Choices

1 ) It is hemoglobinopathy
2 ) Decreased osmatic fragility
3 ) Auto splenectomy happens
4 ) These patients are prone to severe infections

Explanation


Hereditary spherocytosis is not hemoglobinopathy. Hemoglobinopathy is sickle cell anemia and thalassemia. Hereditary spherocytosis is enzymopathy (G6PD enzyme deficiency).

Etiology

It is caused mutation in ANK1, EPB42, SLC4A1, SPTA1, and SPTB genes. It is more commonly transmitted as an autosomal dominant rarely autosomal recessive.

The spherocytosis is caused by mutations in proteins that make up the membrane skeleton of the erythrocyte, which normally maintains the shape and flexibility of the red cell membrane. Due to decreased flexibility RBC gets trapped in spleen and gets lysed. so splenomegaly happens.

Note Auto splenectomy occurs in Sickle cell anemia

Thes have a deficiency of glucose-6-phosphate dehydrogenase (G6PD), which catalyzes the initial step in the oxidation of glucose via the hexose monophosphate pathway. This pathway generates NADPH, which is needed for the maintenance of normal red cell fragility. Severe G6PD deficiency also inhibits the killing of bacteria by granulocytes and predisposes to severe infections. (ref Ganong)

Symptoms and Signs

Increased red cell osmotic fragility, Cholelithiasis, Hepatomegaly, Hyperbilirubinemia, Hypercoagulability, and prone to infections.

Treatment

splenectomy, red cell transfusions, folic acid supplementation, and/or cholecystectomy.

 


Answer

These patients are prone to severe infections

Last Modified : 25-Dec-2019

Previous MCQ
Next MCQ
Enter your email address:

Subjects

Chapters

Previous Years Question Papers