Right Versus Left Distal Axillary Approach For Subclavian Vein Cannulation

All patients will be in supine position, with the arm abducted to 45 degrees , the angle of the arm will be adjusted to acquire best image. The probe will be placed in he parasagittal plane in the deltopectoral groove medial to the coracoid process . The image will be optimized regarding the depth , focus and the gain accordingly for the best image of the axillary artery and vein similar to that acquired when performing an infraclavicular approach for brachial plexus block . The probe will be rotated to obtain a longitudinal image of the axillary vein . The needle will be introduced in real time imaging , in an in-plane technique and blood will be aspirated , the guidewire will be introduced in real time imaging .The internal jugular vein will be scanned bilaterally via ultrasonography to exclude malposition of the guidewire and will be reported in case of such. The catheter will be introduced through the sheath and will be tunneled the skin, Infraclavicular incision will be performed for the port site , the port will be secured in a dissected pocket right above the pectoralis major muscle .Flush back will be confirmed from the port .The incision will be closed in layers .The final position of the catheter tip will be confirmed using fluoroscopic guidance. In case of difficult visualization or failure of cannulation of one side , the subclavian vein of the contralateral side will be scanned and cannulated . The internal jugular vein will be the cannulated instead if any further difficulties were encountered .