Hemorrhagic Disease of the Newborn

These flashcards cover key concepts from the lecture on Hemorrhagic Disease of the Newborn, including causes, classifications, clinical manifestations, and management strategies.

What is the nature of Hemorrhagic Disease of the Newborn (HDN)?

It is a bleeding disorder that may occur during the first few days of life.

Why do healthy neonates not have an increased risk of spontaneous bleeding despite longer prothrombin and aPTT times?

Healthy newborns have prolonged coagulation times due to the immaturity of their coagulation system, but do not have an increased risk of spontaneous bleeding.

What are the main causes of hemorrhagic disease in newborns?

They include coagulation factor abnormalities, platelet abnormalities, fibrinolytic system disturbances, vascular disorders, and other multifactorial conditions.

What is the most common congenital bleeding disorder in newborns?

Hemophilia A, which involves a deficiency of coagulation factor VIII.

How do the clinical manifestations of hemophilia present in neonates?

They primarily include recurrent or prolonged bleeding episodes due to impaired coagulation, with symptoms correlating with the level of factor deficiency.

What is the significance of vitamin K in coagulation?

Vitamin K is essential for the γ-carboxylation of several coagulation factors, enabling proper blood clot formation.

What are key clinical features of Vitamin K Deficiency Bleeding (VKDB)?

Features include cutaneous bleeding, mucosal bleeding, umbilical stump bleeding, and intracranial hemorrhage.

How is von Willebrand Disease (VWD) diagnosed?

Diagnosis involves clinical history, laboratory tests assessing bleeding time, VWF antigen, VWF activity, and factor VIII activity.

What is the role of Desmopressin in managing von Willebrand Disease?

It stimulates the release of stored von Willebrand factor and factor VIII from endothelial cells, mainly effective in Type 1 and some Type 2 variants.

What is disseminated intravascular coagulation (DIC) and what causes it?

DIC is a secondary acquired syndrome characterized by systemic activation of coagulation pathways, leading to both thrombotic and hemorrhagic complications, often due to severe infections or obstetric complications.