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Articles by R. Saxena
Total Records ( 6 ) for R. Saxena
  B Asthana , P Sharma , R Ranjan , P Jain , A Aravindan , P Chandra Mishra and R. Saxena
 

Bleeding disorders constitute a large proportion of referrals to hematology departments. Worldwide, acquired causes of bleeding are commoner than inherited ones. To identify the spectrum of these disorders, we evaluated all referrals for bleeding encountered in this tertiary care centre over a one-year period. Of the total 1342 cases, 1040 (77.5%) had underlying exclusively acquired causes, whereas inherited causes constituted 302 cases (22.5%). Amongst acquired causes, disseminated intravascular coagulation was seen in 297 (28.6%), hepatic coagulopathy in 218 (20.9%), neurosurgical causes (intracranial bleeds) in 154 (14.8%), malignancy in 89 (8.6%), and miscellaneous multiple acquired causes including those due to anticoagulant drug overdose in 282 patients (27.1%). Referrals for isolated prolonged prothrombin time or thrombocytopenia were common, but were excluded from this study because not all presented with bleeding. Prompt laboratory work-up and precise identification of acquired causes of bleeding is the key to planning appropriate patient management including transfusion support.

  Mohammed Suhail Akhter , R Ranjan , A Meena , Birendra Kumar Yadav and R. Saxena
 

Introduction: A number of prothrombotic and fibrinolytic disorders may lead to venous thrombosis. A 4G/5G polymorphism located in the promoter region of plasminogen activator inhibitor-1 (PAI-1) gene has been found to be commonly associated with the levels of PAI-1 and might be a risk factor for deep vein thrombosis (DVT). The aim of this study was to look for the potential association of this polymorphism with DVT in the Asian Indian population. Material and methods: A total of 110 consecutive patients (M:F = 62:48) with idiopathic DVT and equal number of age- and sex-matched healthy controls were the study participants. All study participants were typed for the PAI-1 4G/ 5G polymorphism, factor V Leiden, factor V Hong Kong/Cambridge mutations, and HR2 haplotype. Result: The variant allele for the PAI-1 4G/5G polymorphism showed both genotypic (P = .0013, 2 = 10.303; odds ratio [OR] = 3.75) as well as allelic association (P = .0004, 2 = 12.273; OR = 1.99) with DVT. Factor V Leiden and factor V HR2 haplotype were observed in 10 (9.0%) and 13 (11.8%) patients, respectively. None of the study participants showed the factor V Hong Kong Cambridge mutations. Conclusion: Our study shows the association of 4G allele with DVT in Asian Indian population. The higher prevalence of 4G polymorphism in patients with DVT (compared with controls) seen in our study is in concordance with previous reports from the Caucasian population.

  F Ahmad , M Kannan , V Yadav , A Biswas and R. Saxena
 

von Willebrand disease (VWD) is a most common inherited bleeding disorder. von Willebrand factor (VWF) exists as an extracellular adaptor molecule and generally involves in the hemostasis mechanism through binding with GP (Glycoprotein) Ib-IX-V platelet receptor. Clinical phenotype of bleeding disorders modulated to a decrease in bleeding symptoms by thrombogenic mutations. We made an attempt to investigate the impact of thrombogenic mutations/polymorphisms on the clinical phenotype of 114 different types of patients with VWD, and 120 healthy controls were screened for methylenetetrahydrofolate reductase (MTHFR) 677C/T, factor V (FV) Leiden (1691G/A), β3 integrin (HPA-I) (Human platelets antigen-I) gene (1565T/C), and prothrombin 20210G/A mutations. Genotypic analysis was performed using polymerase chain reaction (PCR) and restriction fragment length polymorphism. Forty-five patients (39.5%) were found to be positive for at least one of the prothrombotic risk factors screened. Prothrombin 20210G/A was not found in any patient with VWD as well as healthy control. Eight patients with VWD were carrying the defective alleles of different thrombogenic markers, showing milder phenotypes than expected. A high prevalence was observed for MTHFR 677C/T (677C/C 73.6%, 677C/T 24.6%, 677T/T 1.8%) and PLA1/A2 (1565T/T 88.6%, 1565T/C 10.5%, 1565C/C 0.87%) polymorphism followed by FV Leiden (1691G/G 97.4%, 1691G/ A 2.6%, 1691A/A 0.00%) in patients with VWD with allelic frequencies 11.4% (677T), 5% (1565C), and 1.3% (1691A). Hence, we concluded that thrombophilic markers were seen to be influencing the clinical phenotypes of patients with VWD.

  F Ahmad , M Kannan , K Kishor and R. Saxena
 

A 35-years old male patient presented severe bleeding was diagnosed to have type 3 von Willebrand disease (VWD) and carrier for Glanzmann thrombasthenia (GT). Propositus and family members were studied through basic coagulation tests and genomic DNA analysis. Two offspring of the family were diagnosed to have GT through platelet aggregation along with VWD carrier. The patient with VWD was found positive for homozygous truncating mutation R1659X in VWF gene, and all offspring were heterozygous carriers of null allele. Hence, propositus was a carrier of GT with severe type 3 VWD and wife was a carrier of GT. Thus, it is concluded that there is importance of careful studies of patients even from nonconsanguineous families to exclude unusual coinheritance of congenital hemostatic disorders. If single replacement therapy in patient not responding well then probably co-expression of coagulopathies required and multiple replacement therapy should be given according to clinical and laboratory features.

  P Sharma and R. Saxena
 

The role of quantitative D-dimer assay in screening for and diagnosing overt disseminated intravascular coagulation (DIC), conventionally diagnosed by the International Society of Thrombosis and Haemostasis’ (ISTH) score, was evaluated. Of patients with clinical conditions associated with overt DIC, 142 with ISTH scores ≥5 (compatible with overt DIC) and 61 with ISTH scores <5 (suggestive of nonovert DIC) underwent the quantitative D-dimer assay. Accuracy indices, receiver operating characteristic (ROC) curve—derived cutoffs, and areas under curve were compared. Mean D-dimer level in overt DIC was 4147.2 ± 2707 ng/mL. In nonovert DIC, it was 1678.9 ± 1888.3 ng/mL. Both were higher than healthy controls (229.6 ± 129.9 ng/mL). An optimized cutoff (2040 ng/mL) had relatively low sensitivity (75.4%) and specificity (73.8%). Extensive overlap between groups at this cutoff reduced diagnostic utility. Lowered cutoffs increased sensitivity (eg, 91.5% at 1000 ng/mL) but diminished specificity (59%), limiting use of screening. In conclusion, the quantitative D-dimer as a stand-alone assay has a limited role in diagnosis of overt DIC.

  D.P. Saxena , S.K. Shukla , K. Kumar , R. Saxena , S. Saxena , S. Shukla , V. Gupta , R. Stephen , H. Kumar and L. Kumar
  The aim of this study was to test the in vitro antiplasmodial effect of extract and different fractions of Diospyros melanoxylan. Diospyros melanoxylon (Barks) are collected from the lower forest of Uttaranchal, which is identified by the local people. Plant materials are known as source of new antimicrobial agents, as a result search has been to discover new antibacterial drugs of plant origin. Six of eight methanolic extracts were found to have significant activity, in vitro anti-plasmodial effect of the water and ethanol extract of IC50 value is ranging from (IC50 = 116±9.19 and IC50 145±140 μg mL-1) and (IC50 = 35±0.0 and IC50 47±4.24 μg mL-1) of D. melanoxylon against chloroquine resistant and susceptible variety of Plasmodium falciparum. Least phytochemicals was observed in case of petroleum ether. These results, so obtained demonstrate the broad spectrum activity of D. melanoxylon bark extracts which may be useful in treatment of various microbial infections. Extracts of three of the four species of Indian Diospyros tested in this study showed antiplasmodial activities, with the best activity shown by D. melanoxylon. This species especially is worthy of further investigation to determine which of its constituents are responsible for the activity.
 
 
 
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