Longitudinal movements and resulting shear strain of the arterial wall
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There has been little interest in the longitudinal movement of the arterial wall. It has been assumed that this movement is negligible compared with the diameter change. Using a new high-resolution noninvasive ultrasonic method, we measured longitudinal movements and diameter change of the common carotid artery of 10 healthy humans. During the cardiac cycle, a distinct bidirectional longitudinal movement of the intima-media complex could be observed in all the subjects. An antegrade longitudinal movement, i.e., in the direction of blood flow, in early systole [ 0.39 mm ( SD 0.26)] was followed by a retrograde longitudinal movement, i.e., in the direction opposite blood flow [ -0.52 mm ( SD 0.27)], later in systole and a second antegrade longitudinal movement [ 0.41 mm ( SD 0.33)] in diastole. The corresponding diameter change was 0.65 mm ( SD 0.19). The adventitial region showed the same basic pattern of longitudinal movement; however, the magnitude of the movements was smaller than that of the intimamedia complex, thereby introducing shear strain and, thus, shear stress within the wall [ maximum shear strain between the intima-media complex and the adventitial region was 0.36 rad ( SD 0.26). These phenomena have not previously been described. Measurements were also performed on the abdominal aorta ( n = 3) and brachial ( n = 3) and popliteal ( n = 3) arteries. Our new information seems to be of fundamental importance for further study and evaluation of vascular biology and hemodynamics and, thus, for study of atherosclerosis and vascular diseases.
|Enheter & grupper|
Ämnesklassifikation (UKÄ) – OBLIGATORISK
|Tidskrift||American Journal of Physiology: Heart and Circulatory Physiology|
|Status||Published - 2006|
|Peer review utförd||Ja|