Fig. 1From: Breath-holding could improve visualization of the internal jugular veins by ultrasound guidance in obese patients with traumaDifferent filling states of the internal jugular vein. V: internal jugular vein; A: Carotid artery; SCM: Sternocleidomastoid muscle. A Short axis of internal jugular vein on clam breath; B short axis of internal jugular vein on breath-holding; C long axis of the internal jugular vein on clam breath; D long axis of the internal jugular vein on breath-holdingBack to article page