Abstract

Technique of loss-of-resistance in epidural block is commonly used for epidural anesthesia in humans with approximately 90% successful rate. However, it may be one of the most difficult procedures to learn for anesthesia residents in hospital. A two-wavelength (650 nm and 532 nm) fiber-optical method has been developed according to the characteristic reflectance spectra of ex-vivo porcine tissues, which are associated with the needle insertion to localize the epidural space (ES). In an in-vivo study in piglets showed that the reflected lights from ES and its surrounding tissue ligamentum flavum (LF) are highly distinguishable. This indicates that this technique has potential to localize the ES on the spot without the help of additional guiding assistance.

© 2010 OSA

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2010 (1)

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

2009 (1)

M. K. Karmakar, X. Li, A. M. Ho, W. H. Kwok, and P. T. Chui, “Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique,” Br. J. Anaesth. 102(6), 845–854 (2009).
[CrossRef]

2006 (4)

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

H. Ellis, “The anatomy of the epidural space,” Anaesth. Intensive Care Med. 7(11), 402–404 (2006).
[CrossRef]

2004 (1)

P. H. Pan, T. D. Bogard, and M. D. Owen, “Incidence and characteristics of failures in obstetric neuraxial analgesia and anesthesia: a retrospective analysis of 19,259 deliveries,” Int. J. Obstet. Anesth. 13(4), 227–233 (2004).
[CrossRef]

2003 (2)

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

A. K. Popp, M. T. Valentine, P. D. Kaplan, and D. A. Weitz, “Microscopic origin of light scattering in tissue,” Appl. Opt. 42(16), 2871–2880 (2003).
[CrossRef]

2002 (2)

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

2001 (3)

T. Grau, R. W. Leipold, R. Conradi, and E. Martin, “Ultrasound control for presumed difficult epidural puncture,” Acta Anaesthesiol. Scand. 45(6), 766–771 (2001).
[CrossRef]

S. F. Chen, Y. Chang, and J. C. Wu, “The spatial distribution of macular pigment in humans,” Curr. Eye Res. 23(6), 422–434 (2001).
[CrossRef]

Ghia Jn, M. Arora Sk, Castillo, and Mukherji Sk, “Confirmation of location of epidural catheters by epidural pressure waveform and computed tomography cathetergram,” Reg. Anesth. Pain Med. 26(4), 337–341 (2001).

2000 (1)

B. C. Tsui, C. Guenther, D. Emery, and B. Finucane, “Determining epidural catheter location using nerve stimulation with radiological confirmation,” Reg. Anesth. Pain Med. 25(3), 306–309 (2000).

1999 (3)

M. Irie, “Evaluation of porcine fat with fiber-optic spectroscopy,” J. Anim. Sci. 77(10), 2680–2684 (1999).

B. C. Tsui, P. Tarkkila, S. Gupta, and R. Kearney, “Confirmation of caudal needle placement using nerve stimulation,” Anesthesiology 91(2), 374–378 (1999).
[CrossRef]

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

1998 (2)

C. Konrad, G. Schüpfer, M. Wietlisbach, and H. Gerber, “Learning manual skills in anesthesiology: is there a recommended number of cases for anesthetic procedures?” Anesth. Analg. 86(3), 635–639 (1998).
[CrossRef]

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

1997 (1)

1996 (1)

1995 (1)

M. Curatolo, A. Orlando, A. M. Zbinden, P. Scaramozzino, and F. S. Venuti, “A multifactorial analysis to explain inadequate surgical analgesia after extradural block,” Br. J. Anaesth. 75(3), 274–281 (1995).

1993 (2)

A. M. Dogliotti, “Segmental peridural spinal anesthesia: a new method of block anesthesia,” Am. J. Surg. 20, 107–118 (1993).
[CrossRef]

D. D. Hood and D. M. Dewan, “Anesthetic and obstetric outcome in morbidly obese parturients,” Anesthesiology 79(6), 1210–1218 (1993).
[CrossRef]

1992 (1)

M. P. Lewis, P. Thomas, L. F. Wilson, and R. C. Mulholland, “The ‘whoosh’ test,” Anaesthesia 47(1), 57–58 (1992).
[CrossRef]

1990 (1)

W. F. Cheong, S. A. Prahl, and A. J. Welch, “A review of the optical properties of biological tissues,” IEEE J. Quantum Electron. 26(12), 2166–2185 (1990).
[CrossRef]

1989 (1)

1973 (1)

1969 (1)

G. A. Mook, O. W. Van Assendelft, and W. G. Zijlstra, “Wavelength dependency of the spectrophotometric determination of blood oxygen saturation,” Clin. Chim. Acta 26(1), 170–173 (1969).
[CrossRef]

1968 (1)

R. L. Longini and R. Zdrojkowski, “A note on the theory of backscattering of light by living tissue,” IEEE Trans. Biomed. Eng. BME-15(1), 4–10 (1968).
[CrossRef]

Abe, S.

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

Altmeyer, P.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Arai, T.

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

Arora Sk, M.

Ghia Jn, M. Arora Sk, Castillo, and Mukherji Sk, “Confirmation of location of epidural catheters by epidural pressure waveform and computed tomography cathetergram,” Reg. Anesth. Pain Med. 26(4), 337–341 (2001).

Backman, V.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Bechara, F. G.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Bigio, I. J.

Bogard, T. D.

P. H. Pan, T. D. Bogard, and M. D. Owen, “Incidence and characteristics of failures in obstetric neuraxial analgesia and anesthesia: a retrospective analysis of 19,259 deliveries,” Int. J. Obstet. Anesth. 13(4), 227–233 (2004).
[CrossRef]

Bolin, F. P.

Bourke, D. L.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

Castillo,

Ghia Jn, M. Arora Sk, Castillo, and Mukherji Sk, “Confirmation of location of epidural catheters by epidural pressure waveform and computed tomography cathetergram,” Reg. Anesth. Pain Med. 26(4), 337–341 (2001).

Chan, K. H.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

Chang, K. Y.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

Chang, Y.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

S. F. Chen, Y. Chang, and J. C. Wu, “The spatial distribution of macular pigment in humans,” Curr. Eye Res. 23(6), 422–434 (2001).
[CrossRef]

Chen, P. T.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

Chen, S. F.

S. F. Chen, Y. Chang, and J. C. Wu, “The spatial distribution of macular pigment in humans,” Curr. Eye Res. 23(6), 422–434 (2001).
[CrossRef]

Cheong, W. F.

W. F. Cheong, S. A. Prahl, and A. J. Welch, “A review of the optical properties of biological tissues,” IEEE J. Quantum Electron. 26(12), 2166–2185 (1990).
[CrossRef]

Chui, P. T.

M. K. Karmakar, X. Li, A. M. Ho, W. H. Kwok, and P. T. Chui, “Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique,” Br. J. Anaesth. 102(6), 845–854 (2009).
[CrossRef]

Collins, K. S.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Conradi, R.

T. Grau, R. W. Leipold, R. Conradi, and E. Martin, “Ultrasound control for presumed difficult epidural puncture,” Acta Anaesthesiol. Scand. 45(6), 766–771 (2001).
[CrossRef]

Cornelissen, P. H.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Crawford, J.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Curatolo, M.

M. Curatolo, A. Orlando, A. M. Zbinden, P. Scaramozzino, and F. S. Venuti, “A multifactorial analysis to explain inadequate surgical analgesia after extradural block,” Br. J. Anaesth. 75(3), 274–281 (1995).

da Fonseca, M. H.

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

de Filho, G. R.

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

Dewan, D. M.

D. D. Hood and D. M. Dewan, “Anesthetic and obstetric outcome in morbidly obese parturients,” Anesthesiology 79(6), 1210–1218 (1993).
[CrossRef]

Dogliotti, A. M.

A. M. Dogliotti, “Segmental peridural spinal anesthesia: a new method of block anesthesia,” Am. J. Surg. 20, 107–118 (1993).
[CrossRef]

Drost, R. A.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Ellis, H.

H. Ellis, “The anatomy of the epidural space,” Anaesth. Intensive Care Med. 7(11), 402–404 (2006).
[CrossRef]

Emery, D.

B. C. Tsui, C. Guenther, D. Emery, and B. Finucane, “Determining epidural catheter location using nerve stimulation with radiological confirmation,” Reg. Anesth. Pain Med. 25(3), 306–309 (2000).

Evans, K. G.

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

Feld, M.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Ference, R. J.

Finucane, B.

B. C. Tsui, C. Guenther, D. Emery, and B. Finucane, “Determining epidural catheter location using nerve stimulation with radiological confirmation,” Reg. Anesth. Pain Med. 25(3), 306–309 (2000).

Fitzmaurice, B. G.

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

Gambichler, T.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Garcia, J. H.

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

Gerber, H.

C. Konrad, G. Schüpfer, M. Wietlisbach, and H. Gerber, “Learning manual skills in anesthesiology: is there a recommended number of cases for anesthetic procedures?” Anesth. Analg. 86(3), 635–639 (1998).
[CrossRef]

Ghia Jn,

Ghia Jn, M. Arora Sk, Castillo, and Mukherji Sk, “Confirmation of location of epidural catheters by epidural pressure waveform and computed tomography cathetergram,” Reg. Anesth. Pain Med. 26(4), 337–341 (2001).

Gomes, H. P.

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

Grant, R. P.

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

Grass, J.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

Grau, T.

T. Grau, R. W. Leipold, R. Conradi, and E. Martin, “Ultrasound control for presumed difficult epidural puncture,” Acta Anaesthesiol. Scand. 45(6), 766–771 (2001).
[CrossRef]

Guenther, C.

B. C. Tsui, C. Guenther, D. Emery, and B. Finucane, “Determining epidural catheter location using nerve stimulation with radiological confirmation,” Reg. Anesth. Pain Med. 25(3), 306–309 (2000).

Gupta, S.

B. C. Tsui, P. Tarkkila, S. Gupta, and R. Kearney, “Confirmation of caudal needle placement using nerve stimulation,” Anesthesiology 91(2), 374–378 (1999).
[CrossRef]

Hamano, T.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Hammel, J.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

Hielscher, A. H.

Ho, A. M.

M. K. Karmakar, X. Li, A. M. Ho, W. H. Kwok, and P. T. Chui, “Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique,” Br. J. Anaesth. 102(6), 845–854 (2009).
[CrossRef]

Hoffman, J. C.

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

Hoffmann, K.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Hood, D. D.

D. D. Hood and D. M. Dewan, “Anesthetic and obstetric outcome in morbidly obese parturients,” Anesthesiology 79(6), 1210–1218 (1993).
[CrossRef]

Irie, M.

M. Irie, “Evaluation of porcine fat with fiber-optic spectroscopy,” J. Anim. Sci. 77(10), 2680–2684 (1999).

Itzkan, I.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Jamrozik, K.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Kamei, M.

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

Kaplan, P. D.

Karmakar, M. K.

M. K. Karmakar, X. Li, A. M. Ho, W. H. Kwok, and P. T. Chui, “Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique,” Br. J. Anaesth. 102(6), 845–854 (2009).
[CrossRef]

Kearney, R.

B. C. Tsui, P. Tarkkila, S. Gupta, and R. Kearney, “Confirmation of caudal needle placement using nerve stimulation,” Anesthesiology 91(2), 374–378 (1999).
[CrossRef]

Kii, N.

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

Konrad, C.

C. Konrad, G. Schüpfer, M. Wietlisbach, and H. Gerber, “Learning manual skills in anesthesiology: is there a recommended number of cases for anesthetic procedures?” Anesth. Analg. 86(3), 635–639 (1998).
[CrossRef]

Kwok, W. H.

M. K. Karmakar, X. Li, A. M. Ho, W. H. Kwok, and P. T. Chui, “Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique,” Br. J. Anaesth. 102(6), 845–854 (2009).
[CrossRef]

Langenberg, C. J.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Lechner, T. J.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Leipold, R. W.

T. Grau, R. W. Leipold, R. Conradi, and E. Martin, “Ultrasound control for presumed difficult epidural puncture,” Acta Anaesthesiol. Scand. 45(6), 766–771 (2001).
[CrossRef]

Lennox, P. H.

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

Lewis, M. P.

M. P. Lewis, P. Thomas, L. F. Wilson, and R. C. Mulholland, “The ‘whoosh’ test,” Anaesthesia 47(1), 57–58 (1992).
[CrossRef]

Li, H.

Li, X.

M. K. Karmakar, X. Li, A. M. Ho, W. H. Kwok, and P. T. Chui, “Real-time ultrasound-guided paramedian epidural access: evaluation of a novel in-plane technique,” Br. J. Anaesth. 102(6), 845–854 (2009).
[CrossRef]

Lima, C.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Longini, R. L.

R. L. Longini and R. Zdrojkowski, “A note on the theory of backscattering of light by living tissue,” IEEE Trans. Biomed. Eng. BME-15(1), 4–10 (1968).
[CrossRef]

Maas, A. J.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Mandell, M. S.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

Manoharan, R.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Martin, E.

T. Grau, R. W. Leipold, R. Conradi, and E. Martin, “Ultrasound control for presumed difficult epidural puncture,” Acta Anaesthesiol. Scand. 45(6), 766–771 (2001).
[CrossRef]

Mascha, E.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

Mook, G. A.

G. A. Mook, O. W. Van Assendelft, and W. G. Zijlstra, “Wavelength dependency of the spectrophotometric determination of blood oxygen saturation,” Clin. Chim. Acta 26(1), 170–173 (1969).
[CrossRef]

Mourant, J. R.

Moussa, G.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Mukherji Sk,

Ghia Jn, M. Arora Sk, Castillo, and Mukherji Sk, “Confirmation of location of epidural catheters by epidural pressure waveform and computed tomography cathetergram,” Reg. Anesth. Pain Med. 26(4), 337–341 (2001).

Mulholland, R. C.

M. P. Lewis, P. Thomas, L. F. Wilson, and R. C. Mulholland, “The ‘whoosh’ test,” Anaesthesia 47(1), 57–58 (1992).
[CrossRef]

Myles, P. S.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Nagaro, T.

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

Nusrat, A.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Orlando, A.

M. Curatolo, A. Orlando, A. M. Zbinden, P. Scaramozzino, and F. S. Venuti, “A multifactorial analysis to explain inadequate surgical analgesia after extradural block,” Br. J. Anaesth. 75(3), 274–281 (1995).

Owen, M. D.

P. H. Pan, T. D. Bogard, and M. D. Owen, “Incidence and characteristics of failures in obstetric neuraxial analgesia and anesthesia: a retrospective analysis of 19,259 deliveries,” Int. J. Obstet. Anesth. 13(4), 227–233 (2004).
[CrossRef]

Pan, P. H.

P. H. Pan, T. D. Bogard, and M. D. Owen, “Incidence and characteristics of failures in obstetric neuraxial analgesia and anesthesia: a retrospective analysis of 19,259 deliveries,” Int. J. Obstet. Anesth. 13(4), 227–233 (2004).
[CrossRef]

Parsons, R. W.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Pederneiras, S. G.

G. R. de Filho, H. P. Gomes, M. H. da Fonseca, J. C. Hoffman, S. G. Pederneiras, and J. H. Garcia, “Predictors of successful neuraxial block: a prospective study,” Eur. J. Anaesthesiol. 19(6), 447–451 (2002).

Perelman, L. T.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Peyton, P. J.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Popp, A. K.

Prahl, S. A.

W. F. Cheong, S. A. Prahl, and A. J. Welch, “A review of the optical properties of biological tissues,” IEEE J. Quantum Electron. 26(12), 2166–2185 (1990).
[CrossRef]

Preuss, L. E.

Reichman, J.

Rigg, J. R.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Sand, D.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Sand, M.

M. Sand, T. Gambichler, G. Moussa, F. G. Bechara, D. Sand, P. Altmeyer, and K. Hoffmann, “Evaluation of the epidermal refractive index measured optical coherence tomography,” Skin Res. Technol. 12(2), 114–118 (2006).
[CrossRef]

Scaramozzino, P.

M. Curatolo, A. Orlando, A. M. Zbinden, P. Scaramozzino, and F. S. Venuti, “A multifactorial analysis to explain inadequate surgical analgesia after extradural block,” Br. J. Anaesth. 75(3), 274–281 (1995).

Schüpfer, G.

C. Konrad, G. Schüpfer, M. Wietlisbach, and H. Gerber, “Learning manual skills in anesthesiology: is there a recommended number of cases for anesthetic procedures?” Anesth. Analg. 86(3), 635–639 (1998).
[CrossRef]

Seiler, M.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Shields, S.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Silbert, B. S.

J. R. Rigg, K. Jamrozik, P. S. Myles, B. S. Silbert, P. J. Peyton, R. W. Parsons, K. S. Collins, and MASTER Anaethesia Trial Study Group, “Epidural anaesthesia and analgesia and outcome of major surgery: a randomized trial,” Lancet 359(9314), 1276–1282 (2002).
[CrossRef]

Sprung, J.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

Tarkkila, P.

B. C. Tsui, P. Tarkkila, S. Gupta, and R. Kearney, “Confirmation of caudal needle placement using nerve stimulation,” Anesthesiology 91(2), 374–378 (1999).
[CrossRef]

Taylor, R. C.

Teunissen, L. J.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Thomas, P.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

M. P. Lewis, P. Thomas, L. F. Wilson, and R. C. Mulholland, “The ‘whoosh’ test,” Anaesthesia 47(1), 57–58 (1992).
[CrossRef]

Ting, C. K.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

Tsou, M. Y.

C. K. Ting, M. Y. Tsou, P. T. Chen, K. Y. Chang, M. S. Mandell, K. H. Chan, and Y. Chang, “A new technique to assist epidural needle placement: fiberoptic-guided insertion using two wavelengths,” Anesthesiology 112(5), 1128–1135 (2010).
[CrossRef]

Tsui, B. C.

B. C. Tsui, C. Guenther, D. Emery, and B. Finucane, “Determining epidural catheter location using nerve stimulation with radiological confirmation,” Reg. Anesth. Pain Med. 25(3), 306–309 (2000).

B. C. Tsui, P. Tarkkila, S. Gupta, and R. Kearney, “Confirmation of caudal needle placement using nerve stimulation,” Anesthesiology 91(2), 374–378 (1999).
[CrossRef]

Tubin, I.

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

Umedaly, H. S.

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

Valentine, M. T.

Van Assendelft, O. W.

G. A. Mook, O. W. Van Assendelft, and W. G. Zijlstra, “Wavelength dependency of the spectrophotometric determination of blood oxygen saturation,” Clin. Chim. Acta 26(1), 170–173 (1969).
[CrossRef]

Van Dam, J.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

van Dorsten, F. R.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

van Niekerk, J.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

van Wijk, M. G.

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
[CrossRef]

Venuti, F. S.

M. Curatolo, A. Orlando, A. M. Zbinden, P. Scaramozzino, and F. S. Venuti, “A multifactorial analysis to explain inadequate surgical analgesia after extradural block,” Br. J. Anaesth. 75(3), 274–281 (1995).

Wallace, M.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Weitz, D. A.

Welch, A. J.

W. F. Cheong, S. A. Prahl, and A. J. Welch, “A review of the optical properties of biological tissues,” IEEE J. Quantum Electron. 26(12), 2166–2185 (1990).
[CrossRef]

White, S. A.

P. H. Lennox, H. S. Umedaly, R. P. Grant, S. A. White, B. G. Fitzmaurice, and K. G. Evans, “A pulsatile pressure waveform is a sensitive marker for confirming the location of the thoracic epidural space,” J. Cardiothorac. Vasc. Anesth. 20(5), 659–663 (2006).
[CrossRef]

Wietlisbach, M.

C. Konrad, G. Schüpfer, M. Wietlisbach, and H. Gerber, “Learning manual skills in anesthesiology: is there a recommended number of cases for anesthetic procedures?” Anesth. Analg. 86(3), 635–639 (1998).
[CrossRef]

Wilson, L. F.

M. P. Lewis, P. Thomas, L. F. Wilson, and R. C. Mulholland, “The ‘whoosh’ test,” Anaesthesia 47(1), 57–58 (1992).
[CrossRef]

Wu, J. C.

S. F. Chen, Y. Chang, and J. C. Wu, “The spatial distribution of macular pigment in humans,” Curr. Eye Res. 23(6), 422–434 (2001).
[CrossRef]

Xie, S.

Yorozuya, T.

T. Nagaro, T. Yorozuya, M. Kamei, N. Kii, T. Arai, and S. Abe, “Fluoroscopically guided epidural block in the thoracic and lumbar regions,” Reg. Anesth. Pain Med. 31(5), 409–416 (2006).

Zbinden, A. M.

M. Curatolo, A. Orlando, A. M. Zbinden, P. Scaramozzino, and F. S. Venuti, “A multifactorial analysis to explain inadequate surgical analgesia after extradural block,” Br. J. Anaesth. 75(3), 274–281 (1995).

Zdrojkowski, R.

R. L. Longini and R. Zdrojkowski, “A note on the theory of backscattering of light by living tissue,” IEEE Trans. Biomed. Eng. BME-15(1), 4–10 (1968).
[CrossRef]

Zijlstra, W. G.

G. A. Mook, O. W. Van Assendelft, and W. G. Zijlstra, “Wavelength dependency of the spectrophotometric determination of blood oxygen saturation,” Clin. Chim. Acta 26(1), 170–173 (1969).
[CrossRef]

Zonios, G.

L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manoharan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamano, I. Itzkan, J. Van Dam, J. Crawford, and M. Feld, “Observation of periodic fine structure in reflectance from biological tissue: a new technique for measuring nuclear size distribution,” Phys. Rev. Lett. 80(3), 627–630 (1998).
[CrossRef]

Acta Anaesthesiol. Scand. (1)

T. Grau, R. W. Leipold, R. Conradi, and E. Martin, “Ultrasound control for presumed difficult epidural puncture,” Acta Anaesthesiol. Scand. 45(6), 766–771 (2001).
[CrossRef]

Am. J. Surg. (1)

A. M. Dogliotti, “Segmental peridural spinal anesthesia: a new method of block anesthesia,” Am. J. Surg. 20, 107–118 (1993).
[CrossRef]

Anaesth. Intensive Care Med. (1)

H. Ellis, “The anatomy of the epidural space,” Anaesth. Intensive Care Med. 7(11), 402–404 (2006).
[CrossRef]

Anaesthesia (1)

M. P. Lewis, P. Thomas, L. F. Wilson, and R. C. Mulholland, “The ‘whoosh’ test,” Anaesthesia 47(1), 57–58 (1992).
[CrossRef]

Anesth. Analg. (3)

C. Konrad, G. Schüpfer, M. Wietlisbach, and H. Gerber, “Learning manual skills in anesthesiology: is there a recommended number of cases for anesthetic procedures?” Anesth. Analg. 86(3), 635–639 (1998).
[CrossRef]

J. Sprung, D. L. Bourke, J. Grass, J. Hammel, E. Mascha, P. Thomas, and I. Tubin, “Predicting the difficult neuraxial block: a prospective study,” Anesth. Analg. 89(2), 384–389 (1999).
[CrossRef]

T. J. Lechner, M. G. van Wijk, A. J. Maas, F. R. van Dorsten, R. A. Drost, C. J. Langenberg, L. J. Teunissen, P. H. Cornelissen, and J. van Niekerk, “Clinical results with the acoustic puncture assist device, a new acoustic device to identify the epidural space,” Anesth. Analg. 96(4), 1183–1187 (2003).
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Anesthesiology (3)

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