1. DIC Disseminated intravascular coagulation (DIC) is a
clinicopathological syndrome that is characterized by
systemic activation of coagulation and fibrinolysis, consumption
of platelets and coagulation factors, and generation
of fibrin clots that can lead to ischemic organ
damage or failure

2. DIC
A continuum in severity with definable phases characterized by initial localization and compensation (non-overt or compensated DIC) that progresses into widespread dysregulation of coagulation and fibrinolysis (overt or decompensated DIC).

3. Pathophysiology
Massive thrombin generation with widespread fibrin deposition and consumption of coagulation proteins and platelets leads to multiple organ dysfunction.

4. Newborn hemostasis
Neonatal platelets are reported to be hypo-reactive; however, this deficiency is balanced by increased vWF activity, resulting in overall normal platelet function.
Factor VIII, factor V, fibrinogen, and factor XIII levels are normal at birth.
Vitamin K–dependent (factors II, VII, IX, and X) and contact factors (XI and
XII) are reduced to about 50% of normal adult values and are further reduced in preterm infants.
Concentrations of the naturally occurring anticoagulants
antithrombin, protein C, and protein S are low at birth.
Both thrombin generation and thrombin inhibition are reduced in the newborn period.

5. Neonatal fibrinolytic activity is intact, despite the decreased concentrations and functional activity of plasminogen. Very low levels of histidine-rich glycoprotein (a physiologic inhibitor of plasminogen binding) and delayed inactivation of neonatal plasmin partially compensate for the reduced plasmin capacity.
Increased plasma levels of PAI may explain the high rate of thromboembolic phenomena associated with intravascular devices in newborns.
Most coagulation factors reached adult levels by 6 months of life with the exception of protein C levels, which remain low until later in childhood.

6. Gestational and postnatal age reference ranges.
A free-flowing blood specimen.
Special sample tubes should be prepared for coagulation testing in infants with a
hematocrit >55% or <25%. This allows for a correct amount of anticoagulant to be
added to the blood sample (citrate-to-blood ratio of 1:9). Similarly, an insufficient
filling of adequately citrated tube (<80%) can produce falsely prolonged coagulation
time.

7. A stepwise approach to the neonate with suspected coagulation disorders is key to a correct diagnosis
1.Initial screening. Consists of a complete blood count (CBC) with platelets, PT/international normalized ratio (INR), aPTT, and fibrinogen level.
2. Prolonged PT. Reflects decreased plasma concentrations of vitamin K– dependent factors.
3. Prolonged aPTT. Results from decreased plasma levels of contact factors (V and
VIII to XI) as well.

8. 4. Bleeding neonate who has no laboratory abnormality ,Factor XIII and α2- antiplasmin activity should be assessed.
5. Elevated D-dimers, as an acute phase reaction in all patients with infection or systemic inflammatory response syndrome (SIRS). A negative d-dimer assay is relatively accurate in ruling out thrombosis.

9. Diagnosis Thrombocytopenia
Elevated fibrin degradation products (FDP) or D-dimers
Prolonged PT, prolonged aPTT, prolonged thrombin clotting time

10. Serial testing may be necessary for the diagnosis, given the dynamic nature of DIC
Fibrinogen is an acute-phase reactant; plasma fibrinogen can remain well within the normal range despite ongoing consumption

11. Clinical presentation
Persistent oozing from the umbilical stump,
Excessive bleed-ing from peripheral venipuncture/heelstick sites,
Large caput succedaneum and cephalhematoma or subgaleal hemorrhage occurring without significant birth trauma history
Prolonged bleeding following circumcision
Intracranial hemorrhage in a term or late preterm infant without history of birth trauma

12. Gastrointestinal bleeding must be distinguished from swallowed maternal blood
Pulmonary hemorrhages are most frequently hemorrhagic pulmonary edema not associated with specific coagulation anomaly.
Major abdominal organ bleeding such as liver or spleen are more often related to traumatic injury or local lesion (such as teratoma) than any coagulopathy.

13. Overt DIC Excessive bleeding Microvascular thrombosis
Hemorrhagic symptoms include petechiae and bruising, oozing from venipuncture sites, bleeding from traumatic and surgical wounds, and in severe cases, bleeding involving internal organs
Thrombosis typically manifests as biochemical and/or clinical evidence of end-organ dysfunction.

14. Maternal, family, and neonatal history
A history of any prior pregnancies and their outcomes can be a clue for disorders such as neonatal alloimmune thrombocytopenia.
Maternal medication use can also lead to immune-mediated thrombocytopenia.
Parental ethnic background and whether there is consanguinity are significant.
Perinatal complications can result in coagulation activation and disseminated intravascular coagulation (DIC).

15. Physical examination
An otherwise normal neonate with thrombocytopenia is suggestive of alloimmune thrombocytopenia.
Skeletal abnormalities such as absence of thumb or radii are important clues for conditions such as thrombocytopenia with absent radii or Fanconi anemia.
Cardiac defects may be associated with factor V deficiency.
Delayed cord separation and persistent oozing from the umbilical stump
is typical for infants with defective fibrinogen production or function and factor
XIII deficiency.
Acquired consumptive coagulopathy is generally a secondary event in a “sick” acting infant. Bacterial or viral infection and metabolic disorders (such as
tyrosinemia)

16. COMMON CAUSES OF DIC IN NEONATES
Sepsis
• Perinatal hypoxia-ischemia (perinatal asphyxia, placental
abruption)
• Necrotizing enterocolitis
• Severe hepatic dysfunction
• Respiratory disorders (RDS, MAS)
• Metabolic disorders (galactosemia, others)
• Vascular anomalies (Kasabach-Merritt syndrome)
• Hematologic disorders (purpura fulminans caused by
protein C/S deficiency, erythroblastosis fetalis)

17. The presence of DIC in a neonate without any evidence of sepsis or history of asphyxia should warrant the evaluation for a capillary hemangioma.

18. Kasabach-Merritt syndrome (KMS)
Localized form of DIC
Cutaneous or occasionally visceral congenital vascular
lesions such as kaposiform hemangioendothelioma and tufted angiomas.
The pathophysiology of KMS is generally presumed to be that of platelet trapping by abnormally proliferating endothelium within the vascular anomaly.
This results in the activation of platelets with a secondary consumption of clotting factors

19. Successful treatment of DIC
Reversal of the underlying condition
Supporting adequate blood flow
Oxygen delivery
Blood component transfusions (platelets, fresh frozen plasma, and cryoprecipitate) are an important part of supportive treatment in DIC

20. Goals Platelets >50,000–100,000/μL
PT <3 seconds above the upper limit of normal,
Fibrinogen >100 mg/dL

21. Fresh frozen plasma
In bleeding patients with DIC and prolonged (PT) and (aPTT), administration (FFP) may be useful.
It should not be instituted based on laboratory tests alone but should be considered in those with active bleeding and in those requiring an invasive procedure.
There is no evidence that infusion of plasma stimulates the ongoing activation of coagulation

22. Prothrombin complex concentrate
If transfusion of FFP is not possible in patients with bleeding because of fluid overload, consider using factor concentrates such as prothrombin complex concentrate, recognising that these will only partially correct the defect because they contain only selected factors, whereas in DIC there is a global deficiency of coagulation factors.

23. Transfusion of platelets
Transfusion of platelets or plasma (components) in patients with DIC should not primarily be based on laboratory results and should in general be reserved for patients who present with bleeding.
In patients with DIC and bleeding or at high risk of bleeding (e.g. postoperative patients or patients due to undergo an invasive procedure) and a platelet count of <50 x 10(9)/l transfusion of platelets should be considered
In non-bleeding patients with DIC, prophylactic platelet transfusion is not given unless it is perceived that there is a high risk of bleeding

24. Fibrinogen concentrate
Severe hypofibrinogenaemia (<1 g/l) that persists despite FFP replacement may be treated with fibrinogen concentrate or cryoprecipitate.

25. Heparin
In cases of DIC where thrombosis predominates, such as arterial or venous thromboembolism, severe purpura fulminans associated with acral ischemia or vascular skin infarction, therapeutic doses of heparin should be considered.
In these patients where there is perceived to be a co-existing high risk of bleeding there may be benefits in using continuous infusion unfractionated heparin (UFH) due to its short half-life and reversibility

26. Heparin
In critically ill, non-bleeding patients with DIC, prophylaxis for venous thromboembolism with prophylactic doses of heparin or low molecular weight heparin is recommended

27. Anticoagulant therapy is not generally used.
The benefit has not proved to out-weigh the added risk for hemorrhage.
The use of activated protein C is controversial (increased risk of ICH).

28. Recombinant factor VIIa (rFVIIa; 40–300 mcg/kg)
This has been used successfully to treat severe bleeding in infants with DIC.
In the presence of endothelial damage, rFVIIa binds to exposed tissue factor to activate factor X and thus generate thrombin.
The potential for thrombotic complications makes its use limited to
life-threatening hemorrhagic situations

29. Recombinant human activated protein C
Consider treating patients with severe sepsis and DIC with recombinant human activated protein C (continuous infusion, 24 microg/kg/h for 4 d).
Patients at high risk of bleeding should not be given recombinant human activated protein C.
Current manufacturers guidance advises against using this product in patients with platelet counts of <30 x 10(9)/l.
In the event of invasive procedures, administration of recombinant human activated protein C should be discontinued shortly before the intervention (elimination half-life approximately 20 min) and may be resumed a few hours later, dependent on the clinical situation.

30. Except for the use of protein C concentrates in purpura fulminans
owing to protein C deficiency, anticoagulant concentrates
(protein C, antithrombin), recombinant factor VIIa, and
recombinant tissue plasminogen activator are not generally. indicated for the routine treatment of DIC

31. Antithrombin cannot be recommended.
In general, patients with DIC should not be treated with antifibrinolytic agents.
Patients with DIC that is characterised by a primary hyperfibrinolytic state and who present with severe bleeding could be treated with lysine analogues, such as tranexamic acid (e.g. 1 g every 8 h).

32. Plasma D-dimer concentration in sick newborn foals
Plasma D-dimer concentration in sick newborn foals. Armengou L and co workers
HYPOTHESIS:
Increased plasma d-dimer concentration occurs in septic neonates and can reliably detect sepsis or DIC, and predict death in ill neonatal foals.
CONCLUSIONS AND CLINICAL IMPORTANCE:
Septic foals showed a marked activation of coagulation and fibrinolytic systems and a high prevalence of DIC. Increased plasma d-dimer concentration is significantly associated with the diagnosis of sepsis
J Vet Intern Med Mar-Apr;22(2): doi: /j x. Epub 2008 Feb 27.

33. Prospective evaluation of coagulation in critically ill neonatal foals
. Prospective evaluation of coagulation in critically ill neonatal foals. Bentz Aiand coworkers
BACKGROUND:
Coagulopathy is a potentially underrecognized complication of sepsis and septic shock in critically ill neonatal foals.
HYPOTHESIS:
Critically ill neonatal foals have abnormalities in coagulation that are associated with disease severity and outcome
CONCLUSIONS AND CLINICAL IMPORTANCE:
Coagulopathy commonly occurs in critically ill neonatal foals, especially those with sepsis and septic shock
J Vet Intern Med Jan-Feb;23(1): doi: /j x

34. Guidelines for the diagnosis and management of disseminated intravascular coagulation. British Committee for Standards in Haematology. Levi M1, Toh CH, Thachil J, Watson HG.
Haematol Apr;145(1): doi: /j x. Epub 2009 Feb 12