How high do the subclavian arteries ascend into the neck

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Presentation transcript:

How high do the subclavian arteries ascend into the neck How high do the subclavian arteries ascend into the neck? A population study using magnetic resonance imaging A.D. Farmery, D. Shlugman, P. Anslow British Journal of Anaesthesia Volume 90, Issue 4, Pages 452-456 (April 2003) DOI: 10.1093/bja/aeg075 Copyright © 2003 British Journal of Anaesthesia Terms and Conditions

Fig 1 Composite coronal T1 weighted MRI showing the relations of the larynx and great vessels in the neck. Note the height of the second part of the right subclavian artery (3) above the clavicle, and close proximity of the common carotid arteries (2) to the trachea. 1=cricoid cartilage, 2=common carotid arteries, 3=subclavian arteries, and 4=clavicles. British Journal of Anaesthesia 2003 90, 452-456DOI: (10.1093/bja/aeg075) Copyright © 2003 British Journal of Anaesthesia Terms and Conditions

Fig 2 Normal plots for RSA-CL (a), LSA-CL (b) and CC-RSA (c). The slopes and intercepts of the regression equations approximate to the means and standard deviations respectively. The correlation coefficients are used in the Shapiro-Francia analysis to assess normality and yield the following P-values: P>0.1 for (a), P>0.01 for (b), and P>0.2 for (c). Key: RSA-CL=distance from highest point of right subclavian artery to the cricoid cartilage. LSA-CL=distance from highest point of left subclavian artery to the cricoid cartilage. CC-RSA=distance between cricoid cartilage and the apex of the right subclavian artery. British Journal of Anaesthesia 2003 90, 452-456DOI: (10.1093/bja/aeg075) Copyright © 2003 British Journal of Anaesthesia Terms and Conditions

Fig 3 A plot of the reciprocal of the probability of encountering a cricoid cartilage to right subclavian artery (CC-RCA) distance less than x. For example, the risk of encountering a CC-RCA distance of less than 5 mm is 1 in 28, as shown by the broken line. British Journal of Anaesthesia 2003 90, 452-456DOI: (10.1093/bja/aeg075) Copyright © 2003 British Journal of Anaesthesia Terms and Conditions

Fig 4 The relationship between neck length (cricoid–clavicle distance) and cricoid–subclavian distance. The displayed regression equation is plotted (bold line). The broken lines enclose the 95% prediction interval. British Journal of Anaesthesia 2003 90, 452-456DOI: (10.1093/bja/aeg075) Copyright © 2003 British Journal of Anaesthesia Terms and Conditions

Fig 5 Axial MRI of the neck in the (a) neutral and (b) extended positions at the level of the cricoid cartilage. 1=internal carotid artery, 2=internal jugular vein, 3=sternocleidomastoid muscle, and 4=cricoid cartilage. British Journal of Anaesthesia 2003 90, 452-456DOI: (10.1093/bja/aeg075) Copyright © 2003 British Journal of Anaesthesia Terms and Conditions