J.-A. Lin, H.-T. Lu British Journal of Anaesthesia

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Reply from the authors British Journal of Anaesthesia

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Presentation transcript:

A convenient alternative for monitoring opening pressure during multiple needle redirection J.-A. Lin, H.-T. Lu British Journal of Anaesthesia Volume 112, Issue 4, Pages 771-772 (April 2014) DOI: 10.1093/bja/aeu083 Copyright © 2014 The Author(s) Terms and Conditions

Fig 1 (a) Half-the-air technique through the three-way stopcock. Ten millilitres of air are aspirated into the syringe above 10 ml test volume (D5W or normal saline). Before local anaesthetic injection for a new tip location, the air is compressed to 50% of the original volume and observed to see if the level starts to decrease in the test syringe. The volume spread could also be visualized in the ultrasound image. The white arrow denotes the action of compression. (b) Local anaesthetic injection after the opening pressure test. If the needle tip location passes the opening pressure test, counterclockwise rotate the handle by 90° for connecting the local anaesthetic syringe with the patient. Keep the same needle tip location and then start injecting local anaesthetic into the space already hydrolocated by the test volume (D5W or normal saline). T, test syringe; L, local anaesthetic syringe. British Journal of Anaesthesia 2014 112, 771-772DOI: (10.1093/bja/aeu083) Copyright © 2014 The Author(s) Terms and Conditions