Introduction: There are conflicting results in the literature regarding the connection between thrombophilias and ischaemic stroke. However, most of the clinical studies have not differentiated between various ischaemic stroke subtypes. Our aim was to investigate whether there is an association between the methylene tetrahydrofolate reductase (MTHFR) C677T polymorphism and ischaemic stroke due to small vessel disease (SVD) in patients 50 years of age. Patients and methods: We performed a retrospective search in the database used at our Health Centre. Our study population consisted of 100 ischaemic stroke patients. 65 patients had MTHFR C677T variants: 21 were homozygous (TT allele), 45 were heterozygous (CT). 35 stroke patients did not carry MTHFR C677T polymorphism (wild genotype, CC). Stroke subtypes were determined according to the TOAST classification. Pearson's chisquared test of independence was used to evaluate differences between subgroups and multivariate logistic regression was also performed. Results: More than half of our study population (52.00%) had lacunar strokes. The ratio of SVD in patients 50 years of age with TT homozygous variant was significantly higher compared to heterozygous and wild type subjects (p ¼ 0.032 and p ¼ 0.03 respectively). Multivariate logistic regression also showed, that apart from hypertension, only TT homozygosity was a predictive factor for SVD related stroke (p ¼ 0.014, OR 1.619, 95% CI 1.390-18.338). Conclusion: Our results demonstrate that in a Hungarian population of ischaemic stroke patients 50 years of age, SVD is the most common stroke subtype. In addition, we found association of SVD stroke with hypertension and MTHFR 677TT homozygous polymorphism.
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