Platelet Disorders

2017 ◽  
Author(s):  
Michael Perry ◽  
John Bedolla ◽  
Truman John Milling

Hemostasis occurs in two steps: platelet plug formation followed by fibrin deposition. Platelet disorders cause incomplete or absent platelet plug formation. Platelets form in bone marrow and have an 8- to 9-day life span. A careful history and physical examination can distinguish between platelets or the coagulation cascade as the cause of deranged hemostasis. Platelet disorders are characterized by mucosal and small vessel bleeding, and petechiae are characteristic. A complete blood count and prothrombin time/international normalized ratio testing reveal most causes. Many drugs can alter platelet production, function, and longevity, but antiplatelet therapy is the most common cause. Other causes include congenital, medication side effects, sepsis, bone marrow suppression, and systemic disease. The platelet count may be low, elevated, or normal. Bleeding time is virtually always prolonged in platelet dysfunction. Therapy for platelet dysfunction depends on the etiology and severity. Platelets are short-lived, and platelet transfusion may be necessary in the unstable or actively bleeding patient. In most other cases, removing the cause or treating the systemic disease will improve hemostasis. Emergency physicians treating patients with abnormal bleeding should understand the coagulation cascade and drug-induced coagulopathy from older and newer agents. Key words: bleeding time, coagulopathy, drug induced, hemostasis, megakaryocyte, mucosal bleeding, petechiae, platelet plug, platelet transfusion, platelets, thrombocytopenia

2016 ◽  
Vol 2 (1) ◽  
pp. 57-59
Author(s):  
Pavithra D ◽  
Praveen D ◽  
Vijey Aanandhi M

Agranulocytosis is also known to be granulopenia, causing neutropenia in circulating blood streams .The destruction of white blood cells takes place which leads to increase in the infection rate in an individual where immune system of the individual is suppressed. The symptoms includes fever, sore throat, mouth ulcers. These are commonly seen as adverse effects of a particular drug and are prescribed for the common diagnostic test for regular monitoring of complete blood count in an admitted patient. Drug-induced agranulocytosis remains a serious adverse event due to occurrence of severe sepsis with deep infection leading to pneumonia, septicaemia, and septic shock in two/third of the patient. Antibiotics seem to be the major causative weapon for this disorder. Certain drugs mainly anti-thyroid drugs, ticlopidine hydrochloride, spironolactone, clozapine, antileptic drugs (clozapine), non-steroidal anti-inflammatory agents, dipyrone are the potential causes. Bone marrow insufficiency followed by destruction or limited proliferative bone marrow destruction takes place. Chemotherapy is rarely seen as a causative agent for this disorder. Genetic manipulation may also include as one of the reason. Agranulocytosis can be recovered within two weeks but the mortality and morbidity rate during the acute phase seems to be high, appropriate adjuvant treatment with broad-spectrum antibiotics are prerequisites for the management of complicated neutropenia. Drugs that are treated for this are expected to change as a resistant drug to the patient. The pathogenesis of agranulocytosis is not yet known. A comprehensive literature search has been carried out in PubMed, Google Scholar and articles pertaining to drug-induced agranulocytosis were selected for review.


2019 ◽  
Vol 6 (1) ◽  
pp. 24-29
Author(s):  
Like Rahayu Nindhita ◽  
Dian Widyaningrum

Introduction : Transfusion thrombocyte concentrate (TC) and thrombocyteapheresis (TA) is a form of use of blood components as supportive measures to increase the number of platelets of patients with hematological malignancies thrombocytopenia, platelet transfusion success rated the corrected count increment (CCI).1 Platelet transfusion refractoriness (PTR) or failure increase in platelet post platelet transfusion, defined as more than two times the transfusion episode or successively obtained the value CCI <7.5 at 1 hour post first transfusion or <4.5 at 18-24 hours post transfusion.31 Materials and methods : Research samples from hematologic malignancies patients with platelet counts <50,000 / mm3, enforced through inspection Bone Marrow punction (BMP), got 2 or more episodes of platelet transfusions in the form Thrombocyte Concentrate (TC) and Thrombocyte Apheresis (TA), aged 1-70 years, do a complete blood count, is hospitalized at Dr. Kariadi’s hospital Semarang during the study period, from the number of pre- and post platelet transfusion CCI value is then determined between the recipient TA and TC. CCI value between TA to TC compared to perform statistical analysis computer using Mann Whitney test Research result : A study of 82 patients with both men and women diagnosed with Hematologic Malignancies obtained Platelet refractoriness cases as much as 5 of the 41 patients who received a transfusion history of using TA (12.19%), and 30 of 41 patients who received a transfusion history using TC (73.17 %). Mann Whitney test showed the value of CCI in case the recipient PTR between TA and TC got significant differences (p <0.05). Conclusion : There is significant difference between the value CCI of TA resipients and TC resipients. The value CCI of TA recipient was significantly higher than the value  CCIof TC recipients. Keywords : thrombocyte apheresis, thrombocyte concentrate, CCI, PTR   Pendahuluan: Transfusi thrombocyte concentrate (TC) dan thrombocyteapheresis (TA)merupakan bentuk penggunaankomponen darah sebagai tindakan suportif untuk meningkatkan jumlah trombositpasien keganasan hematologi dengan trombositopenia, Keberhasilan transfusi trombositdinilai dengan corrected count increment(CCI).1Platelet transfusion refractoriness (PTR) atau kegagalan kenaikan trombosit post transfusi trombosit, didefinisikan sebagai lebih dari  dua kali episode transfusi atau berturut-turut didapatkan nilai CCI < 7,5  pada 1 jam pertama post transfusi atau < 4,5 pada 18-24 jam post transfusi.31 Bahan dan metode: Sampel penelitian adalah penderita keganasan hematologidengan jumlah trombosit <50.000 /mm3, ditegakkan melalui pemeriksaan Bone Marrow Punction (BMP), mendapat 2 atau lebih episode transfusi trombosit berupa Thrombocyte Concentrate (TC) maupunThrombocyte Apheresis (TA), usia 1-70 tahun, dilakukan pemeriksaan darah lengkap, menjalani rawat inap di RSUP Dr. Kariadi Semarang selama periode penelitian, Dari jumlah trombosit pre dan post transfusi kemudian ditentukan nilai CCI antara resipien TA dan TC. Nilai CCI antara TA dengan TC dibandingkan dengan melakukan analisis statistik komputer menggunakan uji Mann Whitney Hasil penelitian: Penelitian terhadap 82 pasien laki-laki maupun perempuan dengan diagnosis Keganasan Hematologi didapatkan kasus Platelet refractoriness sebanyak 5 dari 41 pasien yang mendapatkan riwayat transfusi menggunakan TA (12,19%), dan 30 dari 41 pasien yang mendapatkan riwayat transfusi menggunakan TC (73,17%).Uji Mann Whitney menunjukkan nilai CCI pada kasus PTR antara resipien TA dan TC didapatkan perbedaan  secara signifikan (p<0,05). Simpulan: Didapatkan perbedaan secara signifikan nilai CCI antara yang mendapatkan TA dan yang mendapatkan TC. Nilai CCI resipien TA secara bermakna lebih tinggi daripada nilai CCI resipien TC Kata kunci :thrombocyte apheresis, thrombocyte concentrate, CCI, PTR


2021 ◽  
Vol 14 (11) ◽  
pp. e246788
Author(s):  
Vanessa Lopes ◽  
Joana Ramos ◽  
Patrícia Dias ◽  
Arsénio Santos

Idiosyncratic drug-induced agranulocytosis is a rare life-threatening adverse reaction characterised by an absolute neutrophil count <500 cells/μL of blood. Nitrofurantoin has been associated with haematological adverse events, but few agranulocytosis cases worldwide have been reported. We present a case of a 68-year-old woman who presented with fever and agranulocytosis following treatment with nitrofurantoin. Extensive workup for agranulocytosis, including a bone marrow aspirate, was unremarkable. Treatment with nitrofurantoin was discontinued, which led to a complete recovery of the complete blood count. This case stresses the importance of monitoring treatments, given that widely used drugs are not free from severe adverse reactions.


1987 ◽  
Vol 57 (01) ◽  
pp. 062-066 ◽  
Author(s):  
P A Kyrle ◽  
J Westwick ◽  
M F Scully ◽  
V V Kakkar ◽  
G P Lewis

SummaryIn 7 healthy volunteers, formation of thrombin (represented by fibrinopeptide A (FPA) generation, α-granule release (represented by β-thromboglobulin [βTG] release) and the generation of thromboxane B2 (TxB2) were measured in vivo in blood emerging from a template bleeding time incision. At the site of plug formation, considerable platelet activation and thrombin generation were seen within the first minute, as indicated by a 110-fold, 50-fold and 30-fold increase of FPA, TxB2 and PTG over the corresponding plasma values. After a further increase of the markers in the subsequent 3 minutes, they reached a plateau during the fourth and fifth minute. A low-dose aspirin regimen (0.42 mg.kg-1.day-1 for 7 days) caused >90% inhibition of TxB2formation in both bleeding time blood and clotted blood. At the site of plug formation, a-granule release was substantially reduced within the first three minutes and thrombin generation was similarly inhibited. We conclude that (a) marked platelet activation and considerable thrombin generation occur in the early stages.of haemostasis, (b) α-granule release in vivo is partially dependent upon cyclo-oxygenase-controlled mechanisms and (c) thrombin generation at the site of plug formation is promoted by the activation of platelets.


1982 ◽  
Vol 48 (01) ◽  
pp. 108-111 ◽  
Author(s):  
Elisabetta Dejana ◽  
Silvia Villa ◽  
Giovanni de Gaetano

SummaryThe tail bleeding time (BT) in rats definitely varies according to the method applied. Of the various variables that may influence BT, we have evaluated the position (horizontal or vertical) of the tail, the environment (air or saline), the temperature (4°, 23° or 37° C) and the type of anaesthesia. Transection of the tail tip cannot be used to screen drugs active on platelet function since it is sensitive to coagulation defects. Template BT in contrast is not modified by heparin and is sensitive to defects of platelet number and function (“storage pool disease”, dipyridamole-like drugs, exogenous prostacyclin). In contrast the test fails to detect aspirin-induced platelet dysfunction. The evidence reported indicates that thromboxane A2-prostacyclin balance is not a factor regulating BT. Aspirin treatment however may be a precipitating factor when associated with other abnormalities of platelet function.Template BT is a valid screening test for platelet disorders and for antiplatelet drugs.


2020 ◽  
Vol 18 (4) ◽  
pp. 277-282
Author(s):  
P. Cornejo-Juárez ◽  
B. Islas-Muñoz ◽  
A.F. Ramírez-Ibargüen ◽  
G. Rosales-Pedraza ◽  
B. Chávez-Mazari ◽  
...  

Background: Disseminated Kaposi sarcoma (DKS) is present in patients with advanced HIV infection in whom co-infection with other opportunistic pathogens can occur. Bone marrow (BM) aspirate and biopsy comprises a robust diagnostic tool in patients with fever, cytopenias, and abnormal liver tests. However, the yield in patients with DKS has not been determined. Objective: The aim of this study was to evaluate the utility of BM aspirate and biopsy in patients with DKS. Methods: We included 40 male patients with recent diagnosis of DKS. BM aspirate and biopsy was performed as part of the workup to rule out co-infections. Results: In four patients, Mycobacterium avium complex (MAC) was recovered from culture. In another four patients, intracellular yeasts were observed in the Grocott stain, diagnosed as Histoplasma. The yield of BM was calculated in 20%. Only 12 patients (30%) had fever and 11 (27.5%) had pancytopenia. Alkaline phosphatase (ALP) above normal values and C-reactive protein (CRP) were higher in patients with positive results for BM than in those with negative results (63% vs. 21.9%, and 3.0 vs. 1.2 mg/L; p = 0.03 in both comparisons). No differences were found on comparing complete blood-count abnormalities. Conclusion: We recommend performing a BM aspirate for stains, culture, and biopsy in all HIV patients with DKS, as this will permit the early diagnosis of co-infections and prevent further complications in those who receive chemotherapy.


2009 ◽  
Vol 27 (10) ◽  
pp. 1549-1556 ◽  
Author(s):  
Dorothea Weckermann ◽  
Bernhard Polzer ◽  
Thomas Ragg ◽  
Andreas Blana ◽  
Günter Schlimok ◽  
...  

Purpose The outcome of prostate cancer is highly unpredictable. To assess the dynamics of systemic disease and to identify patients at high risk for early relapse we followed the fate of disseminated tumor cells in bone marrow for up to 10 years and genetically analyzed such cells isolated at various stages of disease. Patients and Methods Nine hundred bone marrow aspirates from 384 patients were stained using the monoclonal antibody A45-B/B3 directed against cytokeratins 8, 18, and 19. Log-rank statistics and Cox regression analysis were applied to determine the prognostic impact of positive cells detected before surgery (244 patients) and postoperatively (214 patients). Samples from primary tumors (n = 55) and single disseminated tumor cells (n = 100) were analyzed by comparative genomic hybridization. Results Detection of cytokeratin-positive cells before surgery was the strongest independent risk factor for metastasis within 48 months (P < .001; relative risk [RR], 5.5; 95% CI, 2.4 to 12.9). In contrast, cytokeratin-positive cells detected 6 months to 10 years after radical prostatectomy were consistently present in bone marrow with a prevalence of approximately 20% but had no influence on disease outcome. Characteristic genotypes of cytokeratin-positive cells were selected at manifestation of metastasis. Conclusion Cytokeratin-positive cells in the bone marrow of prostate cancer patients are only prognostically relevant when detected before surgery. Because we could not identify significant genetic differences between pre- and postoperatively isolated tumor cells before manifestation of metastasis, we postulate the existence of perioperative stimuli that activate disseminated tumor cells. Patients with cytokeratin-positive cells in bone marrow before surgery may therefore benefit from adjuvant therapies.


1997 ◽  
Vol 31 (5) ◽  
pp. 582-585 ◽  
Author(s):  
Anna M Whitling ◽  
Pablo E Pérgola ◽  
John Lee Sang ◽  
Robert L Talbert

OBJECTIVE: TO report a case of agranulocytosis secondary to spironolactone in a patient with cryptogenic liver disease. CASE SUMMARY: A 58-year-old Hispanic woman with cryptogenic cirrhosis was admitted to University Hospital on October 31, 1995. Laboratory data revealed a leukocyte count of 1.0 × 103/mm3 and an absolute neutrophil count (ANC) of 10 cells/mm3. Prior to treatment with spironolactone, the leukocyte count was 10.2 × 103/mm3 and ANC 8400 cells/mm3. Agranulocytosis resolved 5 days following the discontinuation of spironolactone. Results from the bone marrow biopsies before and after treatment with spironolactone suggested that agranulocytosis was caused by the drug's toxic effect on the bone marrow. DISCUSSION: Drug-induced agranulocytosis is a serious adverse effect, occurring at a rate of approximately 6.2 cases per million persons each year. In addition to the case reported here, three other reports of agranulocytosis secondary to spironolactone have been published in the literature. Several factors have been identified that may increase a patient's risk for developing agranulocytosis, including increased age, hepatic or renal impairment, drag dosage and duration, and concurrent medications. CONCLUSIONS: Agranulocytosis secondary to spironolactone is a serious potential adverse effect. Patients with risk factors for developing this adverse effect should be closely monitored since early detection and discontinuation of spironolactone can improve prognosis.


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