scholarly journals Laboratory testing for platelet function disorders

2015 ◽  
Vol 37 ◽  
pp. 18-24 ◽  
Author(s):  
S. J. Israels
Keyword(s):  
Platelet Function ◽  
Laboratory Testing ◽  
Platelet Function Disorders

Determination and Treatment of Disorders of Primary Haemostasis

1999 ◽  
Vol 19 (04) ◽  
pp. 168-175 ◽  
Author(s):  
M. Weippert-Kretschmer ◽  
V. Kretschmer
Keyword(s):  
Platelet Function ◽  
Bleeding Risk ◽  
Bleeding Complications ◽  
Bleeding Tendency ◽  
Platelet Counts ◽  
Platelet Function Disorders ◽  
Perioperative Bleeding ◽  
Before And After ◽  
Low Sensitivity

SummaryPerioperative bleeding complications due to disorders of primary haemostasis are often underestimated. Routine determination of primary haemostasis is still problematic. The in vivo bleeding time (BT) shows low sensitivity and high variability. In this contribution the results and experiences with the IVBT having been obtained in various studies and during 10 years of routine use are reported. Patients and Methods: Blood donors before and after ASA ingestion, patients with thrombocytopenia as well as congenital and acquired platelet function disorders. Monitoring of desmopressin efficacy. IVBT with Thrombostat 4000 (tests with CaCl2 = TST-CaCl2 and ADP = TST-ADP) and PFA-100 (test cartridges with epinephrine = PFA-EPI and ADP = PFA-ADP). Results and Conclusions: IVBT becomes abnormal with platelet counts <100,000/μl. With platelet counts <50,000/μl the results are mostly outside the methodical range. IVBT proved clearly superior to BT in von Willebrand syndrome (vWS). All 16 patients with vWS were detected by PFA-EPI, whereas with BT 7 of 10 patients with moderate and 1 of 6 patients with mild forms of vWS were spotted. The majority of acquired and congenital platelet function disorders with relevant bleeding tendency were detectable by IVBT. Sometimes diagnostic problems arose in case of storage pool defect. Four to 12 h after ingestion of a single dose of 100 mg ASA the TST-CaCl2 became abnormal in all cases, the PFA-EPI only in 80%. However, the ASA sensitivity of TST-CaCl2 proved even too high when looking for perioperative bleeding complications in an urological study. Therefore, the lower ASS sensitivity of the PFA-100 seems to be rather advantageous for the estimation of a real bleeding risk. The good efficacy of desmopressin in the majority of cases with mild thrombocytopenia, congenital and acquired platelet function disorders and even ASS-induced platelet dysfunction could be proven by means of the IVBT. Thus IVBT may help to increase the reliability of the therapy. However, the IVBT with the PFA-100 is not yet fully developed. Nevertheless, routine use can be recommended when special methodical guidelines are followed.

A Case Report on Glanzmann’s Thrombasthenia: A Rare Platelet Function Disorder

2018 ◽  
Vol 2 (02) ◽  
pp. 59-60
Author(s):  
Farida Yasmin ◽  
Md. Anwarul Karim ◽  
Chowdhury Yakub Jamal ◽  
Mamtaz Begum ◽  
Ferdousi Begum
Keyword(s):  
Case Report ◽  
Platelet Function ◽  
The Body ◽  
Presenting Symptoms ◽  
Glanzmann’S Thrombasthenia ◽  
Glanzmann's Thrombasthenia ◽  
Platelet Function Disorders ◽  
Recurrent Epistaxis ◽  
Severe Epistaxis ◽  
History Of

Epistaxis in children is one of the important presenting symptoms for attending emergency department in paediatric patients. Recurrent epistaxis is common in children. Although epistaxis in children usually occurred due to different benign conditions, it may be one of the important presenting symptoms of some inherited bleeding disorder. Whereas most bleeding disorders can be diagnosed through different standard hematologic assessments, diagnosing rare platelet function disorders may be challenging. In this article we describe one case report of platelet function disorders on Glanzmann’s thrombasthenia (GT). Our patient was a 10-year old girl who presented to us with history of recurrent severe epistaxis. She had a bruise on her abdomen and many scattered petechiae in different parts of the body. Her previous investigations revealed no demonstrable haemostatic anomalies. After performing platelet aggregation test, she was diagnosed as GT.

Effectiveness of Standard Platelet Aggregation Studies in Diagnosing Platelet Function Disorders in Adolescents With Menorrhagia

2011 ◽  
Vol 24 (2) ◽  
pp. e48-e49
Author(s):  
Lawrence Amesse ◽  
Teresa Pfaff-Amesse ◽  
William T. Gunning ◽  
Nancy Duffy ◽  
James French
Keyword(s):  
Platelet Aggregation ◽  
Platelet Function ◽  
Platelet Function Disorders

Platelet Disorders

2015 ◽  
Author(s):  
Lawrence L K Leung ◽  
James L. Zehnder
Keyword(s):  
Platelet Function ◽  
Clinical Manifestations ◽  
Von Willebrand Disease ◽  
Drug Induced ◽  
Excessive Bleeding ◽  
Vascular Integrity ◽  
Patient Reports ◽  
Platelet Function Disorders ◽  
Hemorrhagic Disorders ◽  
Von Willebrand

A bleeding disorder may be suspected when a patient reports spontaneous or excessive bleeding or bruising, often secondary to trauma. Possible causes can vary between abnormal platelet number or function, abnormal vascular integrity, coagulation defects, fibrinolysis, or a combination thereof. This review addresses hemorrhagic disorders associated with quantitative or qualitative platelet abnormalities, such as thrombocytopenia, platelet function disorders, thrombocytosis and thrombocythemia, and vascular purpuras. Hemorrhagic dis­orders associated with abnormalities in coagulation (e.g., von Willebrand disease and hemophilia) are not covered. An algorithm shows evidence-based practice guidelines for the management of immune thrombocytopenic purpura. Tables list questions regarding bleeding and bruising to ask patients, clinical manifestations of hemorrhagic disorders, typical results of tests for hemostatic function in bleeding disorders, causes of thrombocytopenia, other forms of drug-induced thrombocytopenia, classification of platelet function disorders, and selected platelet-modifying agents. This review contains ­1 highly rendered figure, 7 tables, and 82 references. 

Platelet Function Disorders

2017 ◽  
pp. 117-137
Author(s):  
Zubair A. Karim ◽  
Fadi T. Khasawneh
Keyword(s):  
Clinical Practice ◽  
Molecular Characterization ◽  
Platelet Function ◽  
Clinical Manifestations ◽  
Functional Responses ◽  
Platelet Function Disorders ◽  
Coagulant Activity ◽  
Common Causes ◽  
Adp Receptor

Platelets play an important role in thrombosis and hemostasis. Moreover, platelet dysfunction due to congenital and acquired etiologies is also one of the most common causes of bleeding encountered in clinical practice. Mostly, platelet function disorders are deficiencies of glycoprotein mediators of adhesion and aggregation, whereas defects of primary receptors for stimuli include those of the P2Y12 ADP receptor. Studies on inherited defects of (1) secretion for storage organelles (dense and alpha-granules), (2) the platelet cytoskeleton, and (3) the generation of pro-coagulant activity have allowed for the identification of genes directly and/or indirectly controlling specific functional responses. This chapter will review recent advances in the molecular characterization of platelet function defects, the spectrum of clinical manifestations of these disorders and their management.

Acquired platelet function disorders

2020 ◽  
Vol 196 ◽  
pp. 561-568 ◽  
Author(s):  
Yvonne Brennan ◽  
Marie Levade ◽  
Christopher M. Ward
Keyword(s):  
Platelet Function ◽  
Platelet Function Disorders
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