factor xii deficiency
TRANSCRIPT
Factor XII deficiency
51 year old female with a history of Multiple Right Calculi, recurrent sinusitis was incidentally found to have excessively High aPTT.
Medical History:No h/o DM,HTN,PTB,Hepatitis
Surgical History:ESWL performed 5 year back
Personal History:Non Smoker, Non Alcoholic
Allergic History:Non Significant
Obstetric History:Menarche at the age of 13,Menstural Period around 28 to 30 days.
ON EXAMINATION
General Condition: Fair
Jaundice:Nil
Anemic :Nil
LN:Nil
Cyanosis:Nil
Clubbing:Nil
Oedema:Nil
Dehydration:Nil
VITALS:
P:68/min
BP:120/70mmHg
R/R:20/min
T:afebrile
Investigations
Complete Blood Count
Urine R/E
CT Scan of Head
Chest Xray
Liver Function Test and Renal Function Test were within Normal Limits.
Low Serum Levels of Calcium was noted.
aPTT value at Our Centre during patient’s inpatient stay
aPTT Date Of Investigations
114.4seconds 2015-06-26
180 seconds 2015-06-26(repeated)
146.5 seconds 2015-06-27
107.1seconds 2015-06-30
Measurement of clotting factor in percentage
Clotting Factor Percentage Detected Normal Limits
VIII 85.9% 50-150%
IX 46.4% 65-150%
XI 69.4% 65-150%
XII 0.10% 50-150%
Diagnosis
Factor XII deficiency
Right Ureteric Calculi
Recurrent Sinusitis
TREATMENT
Inj Vitamin K
Inj Mannitol
Inj Calcium Gluconate
Tab CETRIZINE
and other supportive treatment.
LITERATURE
INTRODUCTION
Factor XII, also called Hageman factor, is an enzyme initiating the coagulation cascade. The main laboratory abnormality, which characterizes patients with factor XII defi ciency, is an asymptomatic prolongation in activated partial thromboplastin time (aPTT), whose incidence is relatively low (1/1,000,000 individuals).
Factor XIIa plays a double role in the cascade reactions of coagulation. It can activate factor XI, which subsequently activates factor IX (previous intrinsic pathway); however, this is its marginal function. The conversion of plasminogen into plasmin by active factor XII and initiation of fibrinolysis is of greater importance.
Although majority of patients with factor XII deficiency show prolonged activated partial thromboplastin time (aPTT), haemorrhagic incidents are not usually associated with the hereditary form of this factor. On the contrary, these patients suffer more often from thromboembolism as did Hageman himself .
Many studies have linked Factor XII deficiency with recurrent pregnancy loses.
Coagulation factor XII deficiency is either congenital or acquired.
Congenital coagulation factor XII deficiency is a kind of rare autosomal recessive hereditary disease, and its clinical manifestation is low factor concentration without significant bleeding. Therefore, coagulation factor XII deficiency is often diagnosed before surgeries or during routing coagulation tests.
In recent years, the fibrinolysis effect of coagulation factor XII attracts more and more concerns and is thought to be greater than the effect of coagulation factor XII in intrinsic coagulation pathway. Currently, researches on coagulation factor XII are mainly focused on cardiovascular and cerebrovascular diseases.
An algorithm for the workup for a prolonged aPTT is shown is shown below.
Mechanism for Factor XII activation
Coagulation Pathway
CONCLUSION
We can assume that since most of the patient detected with Factor XII deficiency are asymptomatic, so no immediate modes of treatment will be required. However, a close monitor on the patient must be done whether patient may or may not manifest as thrombotic disorder rather than bleeding disorders.
Reference
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