1. Measuring holotranscobalamin II, an early indicator of negative vitamin B12 balance, by radioimmunoassay in patients with ischemic cerebrovascular disease
- Author
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Irfan Kuku, Songul Serefhanoglu, Atilla Ilhan, Ismet Aydogdu, and Ersoy Kekilli
- Subjects
Adult ,Male ,medicine.medical_specialty ,Hyperhomocysteinemia ,Homocysteine ,Anemia ,Radioimmunoassay ,Macrocytosis ,Gastroenterology ,Cobalamin ,Brain Ischemia ,chemistry.chemical_compound ,Internal medicine ,medicine ,Humans ,Prospective Studies ,Vitamin B12 ,Risk factor ,Prospective cohort study ,Aged ,Aged, 80 and over ,Transcobalamins ,business.industry ,nutritional and metabolic diseases ,Vitamin B 12 Deficiency ,Hematology ,General Medicine ,Middle Aged ,medicine.disease ,Vitamin B 12 ,Endocrinology ,chemistry ,Vitamin B Complex ,Female ,business ,Biomarkers - Abstract
Circulating homocysteine is a risk factor of cardiovascular and cerebrovascular events. Hyperhomocysteinemia may be an early indicator for vitamin B12 disorders because cobalamin is a cofactor in the remethylation process of homocysteine. Serum holotranscobalamin (holoTC II) becomes decreased before the development of metabolic dysfunction. In this study, we assessed circulating holoTC II to estimate the diagnosis of vitamin B12 deficiency in the first ischemic cerebrovascular attack. We also compared the efficacy of the measurement of plasma holoTC II with the other standard biochemical and hematological markers used to reach the diagnosis of cobalamin deficiency. Forty-five patients (age 71 years (range 35-90), 16 men/29 women) within the first ischemic cerebrovascular event were included in this prospective study. All the enrolled patients have been administered vitamin B12 1 mg intramuscular injection once a day for 10 days. At the baseline and on the tenth day of treatment, plasma levels of holoTC II and the proper biochemical and hematological markers in diagnosing cobalamin deficiency were measured. After admission, anemia and diminished serum vitamin B12 levels were determined to be only 20% (9/45) and 44% (20/45), respectively; 78% (35/45) of the patients had low serum holoTC II (
- Published
- 2007
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