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Black tea improves endothelial function in renal transplant recipients

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تاریخ
2007
نویسنده
Ardalan, MR
Tarzamni, MK
Shoja, MM
Tubbs, RS
Rahimi-Ardabili, B
Ghabili, K
Khosroshahi, HT
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نمایش پرونده کامل آیتم
چکیده
Background. Endothelial damage and dysfunction are commonplace in renal transplant recipients. Impaired endothelial function is an important contributor to cardiovascular diseases. We hypothesized that short-term black tea consumption may improve endothelium-dependent arterial dilation in kidney recipients. Methods. Fifteen recipients were studied on an outpatient basis in a single, university-affiliated clinic. Inclusion criteria were stable and good allograft function. The main exclusion criteria were uncontrolled hypertension, smoking, alcohol consumption, coffee drinking, diabetes mellitus, and coronary artery disease, or a history of upper limb vascular manipulations. After overnight fasting, the brachial artery diameter (BAD) was measured at the end of diastole using an ultrasound machine before (basal BAD) and I minute after temporary (similar to 3 minutes) external occlusion (posthyperemia BAD). Flow-mediated vasodilation (FMV) and percent of FMV (FMV%) were calculated by appropriate formula. FMV and FMV% were determined at baseline and 2 hours after consuming 0.5 L freshly brewed black tea. For control, the study was repeated for each patient the next day and FMV and FMV% were determined before and 2 hours after consuming 0.5 L of water. Results. The men age of patients was 37.2 +/- 9.7 years (range, 25 to 50) with a male:female ratio of 3:2. Patients were 26.8 +/- 10.6 months postrenal transplantation. Black tea consumption significantly increased posthyperemia BAD, FMV, and FMV% (P < .05). However, water consumption did not alter the basal or posthyperemia BAD, FMV, or FMV% (P > .05). Conclusion. Based on our study, short-term consumption of black tea may improve endothelial function and endothelium-dependent arterial vasodilation in renal transplant recipients.
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http://dspace.tbzmed.ac.ir:8080/xmlui/handle/123456789/51726
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