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Fig. 2 | BMC Anesthesiology

Fig. 2

From: Effects of regional anesthesia techniques on local anesthetic plasma levels and complications in carotid surgery: a randomized controlled pilot trial

Fig. 2

Ultrasound images of cervical block. a: deep cervical block, b: intermediate cervical block, c: intermediate cervical block with perivascular infiltration of the internal carotid artery. Ultrasound images were acquired with Philips HD-11-XE (Philips Healthcare GmbH, Hamburg, Germany using a linear probe (12 MHz, L-12-4, Philips Healthcare GmbH, Hamburg, Germany). Direction of the ultrasound enhanced puncture needle is depicted as green dashed line and the needle tip as green cross. Yellow line: superficial cervical fascia, blue line: deep cervical fascia. LA: local anesthetic, ECA: external carotid artery, ICA: internal carotid artery, IJV: internal jugular vein, CCA: commune carotid artery, TP: Processus transversus of the respective cervical vertebra, V: ventral, D: dorsal, SM: M. steroncleidomastoideus. *: C5 nerve root, **: C6 nerve root, ¤: N. vagus, x: N. auricularis magnus and N. transversus colli

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