M.K. Karmakar, X. Li, A. M.-H. Ho, W.H. Kwok, P.T. Chui

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Presentation transcript:

Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique M.K. Karmakar, X. Li, A. M.-H. Ho, W.H. Kwok, P.T. Chui British Journal of Anaesthesia Volume 102, Issue 6, Pages 845-854 (June 2009) DOI: 10.1093/bja/aep079 Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 1 Paramedian oblique sagittal sonogram of the lumbar spine. Note the posterior epidural space is a hypoechoic area between the hyperechoic ligamentum flavum and the posterior dura. The intrathecal space is the anechoic space between the anterior and the posterior dura. The anterior epidural space, although not visible in most patients, is seen here as a hypoechoic space between the anterior dura and the posterior longitudinal ligament. Picture in the inset shows the position and orientation of the transducer with a slight medial tilt during the scan. ESM, erector spinae muscle; CSF, cerebrospinal fluid; ES, epidural space; L4, lamina of L4 vertebra; L5, lamina of L5 vertebra. (Reproduced with permission from www.aic.cuhk.edu.hk/usgraweb.) British Journal of Anaesthesia 2009 102, 845-854DOI: (10.1093/bja/aep079) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 2 Paramedian sagittal sonogram of the lumbosacral junction. The posterior surface of the sacrum is identified as a flat hyperechoic band with an acoustic shadow anterior to it. The dip or gap between the sacrum and the lamina of L5 is the L5/S1 intervertebral space. The L4/L5 and L3/L4 intervertebral spaces are identified by counting upwards. ESM, erector spinae muscle. (Reproduced with permission from www.aic.cuhk.edu.hk/usgraweb.) British Journal of Anaesthesia 2009 102, 845-854DOI: (10.1093/bja/aep079) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 3 Paramedian oblique sagittal sonogram of the lumbar spine during real-time US-guided paramedian epidural access. Picture in the inset shows the orientation of the transducer and the direction in which the Tuohy needle is introduced (in-plane) during the epidural access. The tip of the Tuohy needle (short white arrows) is seen embedded in the ligamentum flavum. CSF, cerebrospinal fluid. (Reproduced with permission from www.aic.cuhk.edu.hk/usgraweb.) British Journal of Anaesthesia 2009 102, 845-854DOI: (10.1093/bja/aep079) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 4 Paramedian oblique sagittal sonogram of the lumbar spine showing the sonographic changes within the spinal canal after the LOR to saline. Note the anterior displacement of the posterior dura and widening of the posterior epidural space. There is also compression of the thecal sac, and the cauda equina nerve roots are now visible within the thecal sac in this patient. ESM, erector spinae muscle. (Reproduced with permission from www.aic.cuhk.edu.hk/usgraweb.) British Journal of Anaesthesia 2009 102, 845-854DOI: (10.1093/bja/aep079) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions