Background: Endothelial dysfunction is thought to be a key event in the development of atherosclerosis. It is a systemic process that simultaneously affects different vascular territories including coronary arteries. It is recommended that noninvasive approaches assessing endothelial function in peripheral vessels like flow mediated dilatation are indirectly representative of coronary vascular function.Objectives: This study is aimed to assess endothelial dysfunction by using flow mediated dilatation in patients with coronary artery diseasePatients and methods: 82 patients of either sex with an age range of 40-65years are involved in this study. Each patient was subjected to two tests; first test was the flow mediated dilatation percentage (FMD%) measurement to assess endothelial functional integrity and second one was coronary computerized tomography angiography for measuring the percentage of coronary artery stenosis.Results: the results of this study revealed that FMD% is inversely correlated with the percentage of coronary artery stenosis (p value <0.01). FMD% in patients having a single coronary vessel atheromatous stenosis (9.9±3.5) % was significantly lower than that of control subjects (15.3±7) %, p<0.0001.Conclusion: this study concludes that FMD% of brachial artery could be used as a marker for systemic endothelial functional integrity including that of coronary arteries.

Background: Arterial functional changes reflected by vascular stiffness might occur at early stages of cardiovascular disease before the morphological alterations reflected by increasing the intima media thickness and it is widely used as a very sensitive indicator of functional vascular damage.Objectives: This study is aimed to correlate ultrasound detected vascular functional changes with the severity and extent of coronary artery disease.Patients and methods: Sonographic scans were performed on 100 Patients (61males, 39 females) with an age range of (40-65years) for measuring carotid and brachial arteries end diastolic and end systolic diameters to calculate vascular stiffness index . Coronary CT angiography has been used to visualize the atherosclerotic plaque to define the degree of luminal stenosis by creation of high-quality images which are obtained by the multislice CT spiral scanners.Results: A positive statistical correlation was observed between the stiffness index of both carotid and brachial arteries in single coronary lesion (SCL), multiple coronary lesion (MCL) and control groups in addition to the significant positive correlation between both arteries stiffness index with the percentage of coronary artery stenosis in SCL group. Significant difference between the arterial stiffness index among the study groups is only noticed for carotid artery between the control and MCL groups (p<0.05).Conclusion: Conduit arterial stiffness index is a good indicator of the severity and extent of coronary artery disease.

Background: Arterial functional changes reflected by vascular stiffness might occur at early stages of cardiovascular disease before the morphological alterations reflected by increasing the intima media thickness and it is widely used as a very sensitive indicator of functional vascular damage. Objectives: This study is aimed to correlate ultrasound detected vascular functional changes with the severity and extent of coronary artery disease. Patients and methods: Sonographic scans were performed on 100 Patients (61males, 39 females) with an age range of (40-65years) for measuring carotid and brachial arteries end diastolic and end systolic diameters to calculate vascular stiffness index. Coronary CT angiography has been used to visualize the atherosclerotic plaque to define the degree of luminal stenosis by creation of high-quality images which are obtained by the multislice CT spiral scanners. Results: A positive statistical correlation was observed between the stiffness index of both carotid and brachial arteries in single coronary lesion (SCL), multiple coronary lesion (MCL) and control groups in addition to the significant positive correlation between both arteries stiffness index with the percentage of coronary artery stenosis in SCL group. Significant difference between the arterial stiffness index among the study groups is only noticed for carotid artery between the control and MCL groups (p<0.05). Conclusion: Conduit arterial stiffness index is a good indicator of the severity and extent of coronary artery disease.

Background: Endothelial dysfunction is thought to be a key event in the development of atherosclerosis. It is a systemic process that simultaneously affects different vascular territories including coronary arteries. It is recommended that noninvasive approaches assessing endothelial function in peripheral vessels like flow mediated dilatation are indirectly representative of coronary vascular function. Objectives: This study is aimed to assess endothelial dysfunction by using flow mediated dilatation in patients with coronary artery disease Patients and methods: 82 patients of either sex with an age range of 40-65years are involved in this study. Each patient was subjected to two tests; first test was the flow mediated dilatation percentage (FMD%) measurement to assess endothelial functional integrity and second one was coronary computerized tomography angiography for measuring the percentage of coronary artery stenosis. Results: the results of this study revealed that FMD% is inversely correlated with the percentage of coronary artery stenosis (p value <0.01). FMD% in patients having a single coronary vessel atheromatous stenosis (9.9±3.5) % was significantly lower than that of control subjects (15.3±7) %, p<0.0001. Conclusion: this study concludes that FMD% of brachial artery could be used as a marker for systemic endothelial functional integrity including that of coronary arteries.