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Yekeler, I., Pac, M., Kocak, H., Ates, A., Basoglu, A., Ege, E., Reis, A.K. and Ayd?n, M.E. (1993) Atherosclerosis in the internal mammary artery and comparison of the risk factors. Turkiye Klinikleri Journal of Medical Sciences, 11, 89-92.

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• TITLE: Effect of topical vasodilator on internal thoracic artery blood flow. A placebo-controlled clinical study

  AUTHORS: Cenap Ozkara, Omer Faruk Dogan, Cevdet Furat

  KEYWORDS: Coronary Artery Disease; Vasospasm;Topical Vasodilators

  JOURNAL NAME: World Journal of Cardiovascular Diseases, Vol.2 No.3, July 23, 2012

  ABSTRACT: Objective: The internal thoracic artery (ITA) is the conduit of choice for coronary artery bypass grafting (CABG). To avoid spasm of the ITA various topical vasodilators have been suggested either intraluminally or by topical application. In order to describe the best vasodilating agent for preparation of the ITA, a randomized double-blind placebo controlled clinical work was performed in a group of CABG patients. Methods: Three hundred consecutive patients submitted for elective first time coronary artery bypass grafting were randomly subdivided into five groups. The first measurement was performed shortly after the internal thoracic artery was dissected from the chest wall and the second just prior to performing distal anastomosis to the left anterior descending coronary artery. During the time interval between the two measurements topical vasodilator has been injected into the endothoracic fascia of the ITA using the following drugs: papaverine 2 mg/ml, nitrogly-cerin 1 mg/ml, nitroprusside 0.5 mg/ml, mixed solution include sodium nitroprusside (1 mg/ml) and diltiazem (0.5 mg/ml) and normal saline 0.9%. Results: No statistically significant differences were found between the groups in respect to age, body surface area, cardiopulmonary bypass time, cross clamping time, and time interval between the two flow measurements. Mean arterial pressure at the time of the first and second internal thoracic artery flow measurements did not show statistically significant differences either within or between the groups. In all five groups, the free flow of the internal thoracic artery increased significantly with time. However, no statistically significant differences were shown between the five groups with respect to second flow. Conclusions: We suggest that preparation of the ITA by topical vasodilators injection into the endothoracic fascia does not result in a significantly superior free flow than placebo.