The DOI matches its Crossref record; 83 of the 83 references it cites were found in a registry or an index.
Photoplethysmography
Abstract
The photoplethysmographic (PPG) waveform, also known as the pulse oximeter waveform, is one of the most commonly displayed clinical waveforms. First described in the 1930s, the technology behind the waveform is simple. The waveform, as displayed on the modern pulse oximeter, is an amplified and highly filtered measurement of light absorption by the local tissue over time. It is optimized by medical device manufacturers to accentuate its pulsatile components. Physiologically, it is the result of a complex, and not well understood, interaction between the cardiovascular, respiratory, and autonomic systems. All modern pulse oximeters extract and display the heart rate and oxygen saturation derived from the PPG measurements at multiple wavelengths. "As is," the PPG is an excellent monitor for cardiac arrhythmia, particularly when used in conjunction with the electrocardiogram (ECG). With slight modifications in the display of the PPG (either to a strip chart recorder or slowed down on the monitor screen), the PPG can be used to measure the ventilator-induced modulations which have been associated with hypovolemia. Research efforts are under way to analyze the PPG using improved digital signal processing methods to develop new physiologic parameters. It is hoped that when these new physiologic parameters are combined with a more modern understanding of cardiovascular physiology (functional hemodynamics) the potential utility of the PPG will be expanded. The clinical researcher's objective is the use of the PPG to guide early goal-directed therapeutic interventions (fluid, vasopressors, and inotropes), in effect to extract from the simple PPG the information and therapeutic guidance that was previously only obtainable from an arterial pressure line and the pulmonary artery catheter.
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“It is reported that the lower-frequency wave manifestation in the total PPG signal can be attributed to the venous vascular system [119].”
From Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring (2021) · cites this paper as [119]
Citations
Cites
Heart Rate Variability: Standards of Measurement, Physiological Interpretation, and Clinical Use
Electrophysiology, T. F. O. T. E. S. O. C. T. N. A. (1996) · Circulation · doi:10.1161/01.cir.93.5.1043 · Cited by 17,159
Non-contact, automated cardiac pulse measurements using video imaging and blind source separation
Poh, M., McDuff, D., & Picard, R. W. (2010) · Optics Express · doi:10.1364/oe.18.010762 · Cited by 1,652
Gan, T. J., Soppitt, A. J., Maroof, M., El-Moalem, H. E., Robertson, K. M., Moretti, E., Dwane, P., & Glass, P. S. A. (2002) · Anesthesiology · doi:10.1097/00000542-200210000-00012 · Cited by 950
Hamilton, M. A., Cecconi, M., & Rhodes, A. (2010) · Anesthesia & Analgesia · doi:10.1213/ane.0b013e3181eeaae5 · Cited by 897
Changes in Arterial Pressure during Mechanical Ventilation
Michard, F. (2005) · Anesthesiology · doi:10.1097/00000542-200508000-00026 · Cited by 702
Takazawa, K., Tanaka, N., Fujita, M., Matsuoka, O., Saiki, T., Aikawa, M., Tamura, S., & Ibukiyama, C. (1998) · Hypertension · doi:10.1161/01.hyp.32.2.365 · Cited by 589
Cannesson, M. P., Manach, Y. L., Hofer, C. K., Goarin, J., Lehot, J.-J., Vallet, B., & Tavernier, B. (2011) · Anesthesiology · doi:10.1097/aln.0b013e318225b80a · Cited by 549
THE BLOOD SUPPLY OF VARIOUS SKIN AREAS AS ESTIMATED BY THE PHOTOELECTRIC PLETHYSMOGRAPH
Hertzman, A. B. (1938) · American Journal of Physiology-Legacy Content · doi:10.1152/ajplegacy.1938.124.2.328 · Cited by 460
Photoplethysmography: Beyond the Calculation of Arterial Oxygen Saturation and Heart Rate
Shelley, K. H. (2007) · Anesthesia & Analgesia · doi:10.1213/01.ane.0000269512.82836.c9 · Cited by 450
Functional hemodynamic monitoring.
Pinsky, M. R., & Payen, D. M. (2005) · Critical Care · doi:10.1186/cc3927 · Cited by 369
Anesthetic Doses Blocking Adrenergic (Stress) and Cardiovascular Responses to Incision—MAC BAR
Roizen, M. F., HORRIGAN, R. W., & Frazer, B. M. (1981) · Anesthesiology · doi:10.1097/00000542-198105000-00008 · Cited by 333
Wieringa, F. P., Mastik, F., & van der Steen, A. F. W. (2005) · Annals of Biomedical Engineering · doi:10.1007/s10439-005-5763-2 · Cited by 284
Lu, S. F., Zhao, H., Ju, K., Shin, K., Lee, M., Shelley, K. H., & Chon, K. H. (2007) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-007-9103-y · Cited by 284
Preisman, S., Kogan, S., Berkenstadt, H., & Perel, A. (2005) · British Journal of Anaesthesia · doi:10.1093/bja/aei262 · Cited by 268
Reuter, D. A., Bayerlein, J., Goepfert, M. S., Weis, F. C., Kilger, E., Lamm, P., & Goetz, A. E. (2003) · Intensive Care Medicine · doi:10.1007/s00134-003-1649-7 · Cited by 265
Pulse oximetry: its invention, theory, and future
Aoyagi, T. (2003) · Journal of Anesthesia · doi:10.1007/s00540-003-0192-6 · Cited by 263
Aarts, L. A. M., Jeanne, V., Cleary, J. P., Lieber, C. A., Nelson, J. S., Oetomo, S. B., & Verkruysse, W. (2013) · Early Human Development · doi:10.1016/j.earlhumdev.2013.09.016 · Cited by 241
The peripheral pulse wave: Information overlooked
Murray, W. B., & Foster, P. A. (1996) · The Journal of Clinical Monitoring · doi:10.1007/bf02077634 · Cited by 231
The difference in pulse transit time to the toe and finger measured by photoplethysmography
Nitzan, M., Khanokh, B., & Slovik, Y. (2001) · Physiological Measurement · doi:10.1088/0967-3334/23/1/308 · Cited by 218
Nitzan, M., Babchenko, A., Khanokh, B., & Landau, D. (1998) · Physiological Measurement · doi:10.1088/0967-3334/19/1/008 · Cited by 217
Cannesson, M. P., Attof, Y., Rosamel, P., Desebbe, O., Joseph, P., Metton, O., Bastien, O. H., & Lehot, J.-J. (2007) · Anesthesiology · doi:10.1097/01.anes.0000267593.72744.20 · Cited by 215
The Light–Tissue Interaction of Pulse Oximetry
Mannheimer, P. D. (2007) · Anesthesia & Analgesia · doi:10.1213/01.ane.0000269522.84942.54 · Cited by 194
History of blood gas analysis. VI. Oximetry
Severinghaus, J. W., & Astrup, P. B. (1986) · The Journal of Clinical Monitoring · doi:10.1007/bf02851177 · Cited by 153
Blood Flow Limits and Pulse Oximeter Signal Detection
Lawson, D., Norley, I., Korbon, G., Loeb, R. G., & Ellis, J. B. (1987) · Anesthesiology · doi:10.1097/00000542-198710000-00032 · Cited by 137
Wave Reflections and the Arterial Pulse
O’Rourke, M. F. (1984) · Archives of Internal Medicine · doi:10.1001/archinte.1984.00350140192026 · Cited by 127
Different Responses of Ear and Finger Pulse Oximeter Wave Form to Cold Pressor Test
Awad, A. A., Ghobashy, M. A. M., Ouda, W., Stout, R. G., Silverman, D. G., & Shelley, K. H. (2001) · Anesthesia & Analgesia · doi:10.1097/00000539-200106000-00026 · Cited by 127
Sandroni, C., Cavallaro, F., Marano, C., Falcone, C., Santis, P. D., & Antonelli, M. M. (2012) · Intensive Care Medicine · doi:10.1007/s00134-012-2621-1 · Cited by 122
Simple photon diffusion analysis of the effects of multiple scattering on pulse oximetry
Schmitt, J. M. (1991) · IEEE Transactions on Biomedical Engineering · doi:10.1109/10.137285 · Cited by 118
Photoelectric plethysmography-some fundamental aspects of the reflection and transmission methods
Nijboer, J. A., Dorlas, J. C., & Mahieu, H. F. (1981) · Clinical Physics and Physiological Measurement · doi:10.1088/0143-0815/2/3/004 · Cited by 116
Naschitz, J. E., Bezobchuk, S., Priselac, R. M., Sundick, S., Dreyfuss, D., Khorshidi, I., Karidis, A., Manor, H., Nagar, M., Peck, E. R., et al. (2004) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-005-4300-z · Cited by 114
Peripheral Flow Index Is a Reliable and Early Indicator of Regional Block Success
Galvin, E. M., Niehof, S. P., Verbrugge, S. J. C., Maissan, I., Jahn, A., Klein, J., & van Bommel, J. (2006) · Anesthesia & Analgesia · doi:10.1213/01.ane.0000220947.02689.9f · Cited by 111
Monnet, X., Guérin, L., Jozwiak, M., Bataille, A., Fournier, J., Richard, C., & Teboul, J. (2012) · British Journal of Anaesthesia · doi:10.1093/bja/aes373 · Cited by 105
Pleth variability index predicts fluid responsiveness in critically ill patients*
Loupec, T., Nanadoumgar, H., Frasca, D., Petitpas, F., Laksiri, L., Baudouin, D., Debaene, B., Dahyot‐Fizelier, C., & Mimoz, O. (2010) · Critical Care Medicine · doi:10.1097/ccm.0b013e3181ffde1c · Cited by 104
Perner, A., & Faber, T. (2006) · Acta Anaesthesiologica Scandinavica · doi:10.1111/j.1399-6576.2006.01120.x · Cited by 98
Shelley, K. H., Tamai, D., Jablonka, D., Gesquiere, M., Stout, R. G., & Silverman, D. G. (2005) · Anesthesia & Analgesia · doi:10.1213/01.ane.0000145063.01043.4b · Cited by 91
Sharwood-Smith, G. H., Bruce, J., & Drummond, G. B. (2005) · British Journal of Anaesthesia · doi:10.1093/bja/aei266 · Cited by 91
Landsverk, S. A., Høiseth, L. Ø., Kvandal, P., Hisdal, J., Skare, Ø., & Kirkebøen, K. A. (2008) · Anesthesiology · doi:10.1097/aln.0b013e3181895f9f · Cited by 90
Shelley, K. H., Alian, A. A., Stout, R. G., & Silverman, D. G. (2006) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-006-9010-7 · Cited by 86
Kim, J. M., Arakawa, K., Benson, K. T., & Fox, D. K. (1986) · Anesthesia & Analgesia · doi:10.1213/00000539-198612000-00015 · Cited by 86
The absence of vasoconstrictor reflexes in the forehead circulation. Effects of cold
Hertzman, A. B., & Roth, L. W. (1942) · American Journal of Physiology-Legacy Content · doi:10.1152/ajplegacy.1942.136.4.692 · Cited by 85
Cardiac output by Modelflow® method from intra-arterial and fingertip pulse pressure profiles
Kenfack, M. A., LADOR, F., Licker, M. J., Moia, C., Tam, E., Capelli, C., Morel, D. R., & Ferretti, G. (2004) · Clinical Science · doi:10.1042/cs20030303 · Cited by 79
Time domain analysis of the arterial pulse in clinical medicine
O’Rourke, M. F. (2009) · Medical & Biological Engineering & Computing · doi:10.1007/s11517-008-0370-7 · Cited by 79
Pleth Variability Index to Predict Fluid Responsiveness in Colorectal Surgery
Hood, J. A., & Wilson, R. (2011) · Anesthesia & Analgesia · doi:10.1213/ane.0b013e31822c10cd · Cited by 78
McGrath, S. P., Ryan, K. L., Wendelken, S., Rickards, C. A., & Convertino, V. A. (2010) · Anesthesia & Analgesia · doi:10.1213/ane.0b013e3181cb3f4a · Cited by 75
Optical noninvasive monitoring of skin blood pulsations
Spīgulis, J. (2005) · Applied Optics · doi:10.1364/ao.44.001850 · Cited by 75
Hashimoto, J., WATABE, D., Kimura, A., TAKAHASHI, H., Ohkubo, T., Totsune, K., & Imai, Y. (2005) · American Journal of Hypertension · doi:10.1016/j.amjhyper.2004.11.009 · Cited by 74
Signal recovery in imaging photoplethysmography
Holton, B. D., Mannapperuma, K., Lesniewski, P. J., & Thomas, J. C. (2013) · Physiological Measurement · doi:10.1088/0967-3334/34/11/1499 · Cited by 73
Using ventilation-induced plethysmographic variations to optimize patient fluid status
Desebbe, O., & Cannesson, M. P. (2008) · Current Opinion in Anaesthesiology · doi:10.1097/aco.0b013e32831504ca · Cited by 70
What does photoplethysmography measure?
de Trefford, J., & Lafferty, K. (1984) · Medical & Biological Engineering & Computing · doi:10.1007/bf02447713 · Cited by 65
Cooke, W. H., & Convertino, V. A. (2005) · The Journal of Trauma: Injury, Infection, and Critical Care · doi:10.1097/01.ta.0000151345.16338.fd · Cited by 64
Arterial-pulse oximetry loops: a new method of monitoring vascular tone.
Shelley, K. H., Murray, W. B., & Chang, D. (1997) · The Journal of Clinical Monitoring · doi:10.1023/a:1007361020825 · Cited by 61
Applications of photoelectric plethysmography in peripheral vascular disease
Hertzman, A. B., & Dillon, J. B. (1940) · American Heart Journal · doi:10.1016/s0002-8703(40)90534-8 · Cited by 57
Young, C. C., Mark, J. B., White, W. D., DeBree, A., Vender, J. S., & Fleming, A. J. (1995) · The Journal of Clinical Monitoring · doi:10.1007/bf01617519 · Cited by 56
Kim, S., Song, J., Park, J.-H., Kim, J., Park, Y., & Hwang, G. (2012) · Anesthesia & Analgesia · doi:10.1213/ane.0b013e318270a6d9 · Cited by 54
Measuring venous oxygenation using the photoplethysmograph waveform
Walton, Z. D., Kyriacou, P. A., Silverman, D. G., & Shelley, K. H. (2010) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-010-9248-y · Cited by 53
Awad, A. A., Ghobashy, M. A. M., Stout, R. G., Silverman, D. G., & Shelley, K. H. (2001) · Anesthesia & Analgesia · doi:10.1097/00000539-200112000-00022 · Cited by 50
The detection of peripheral venous pulsation using the pulse oximeter as a plethysmograph
Shelley, K. H., Dickstein, M., & Shulman, S. M. (1993) · Journal of Clinical Monitoring · doi:10.1007/bf02886699 · Cited by 48
Self-citationTalke, P. O., Nichols, R. J., & Traber, D. L. (1990) · Journal of Clinical Monitoring and Computing · doi:10.1007/bf02832176 · Cited by 46
Analysis of the Ear Pulse Oximeter Waveform
Alian, A. A., Stout, R. G., Ghobashy, M. A. M., Rezkanna, H., Silverman, D. G., & Shelley, K. H. (2006) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-006-9018-z · Cited by 45
Luginbu¨hl, M., Reichlin, F., Sigurdsson, G. H., Zbinden, A. M., & Petersen‐Felix, S. (2002) · British Journal of Anaesthesia · doi:10.1093/bja/89.3.389 · Cited by 43
Pulse wave velocity predicts mortality in renal transplant patients
Mitchell, A., Saez, A. M. O., Kos, M., Witzke, O., Kribben, A., & Nürnberger, J. (2010) · European journal of medical research · doi:10.1186/2047-783x-15-10-452 · Cited by 39
Alian, A. A., Galante, N. J., Stachenfeld, N. S., Silverman, D. G., & Shelley, K. H. (2011) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-011-9316-y · Cited by 36
Comparison of Blood Pressure Measurement by Doppler and by Pulse Oximetry Techniques
Wallace, C. T., Baker, J. D., Alpert, C. C., Tankersley, S. J., Conroy, J. M., & Kerns, R. E. (1987) · Anesthesia & Analgesia · doi:10.1213/00000539-198710000-00019 · Cited by 35
DISTINCTION BETWEEN ARTERIAL, VENOUS AND FLOW COMPONENTS IN PHOTOELECTRIC PLETHYSMOGRAPHY IN MAN
Hertzman, A. B., & Dillon, J. B. (1940) · American Journal of Physiology-Legacy Content · doi:10.1152/ajplegacy.1940.130.1.177 · Cited by 31
Alian, A. A., Galante, N. J., Stachenfeld, N. S., Silverman, D. G., & Shelley, K. H. (2011) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-011-9317-x · Cited by 30
Pulse oximetry: Historical review and Ohmeda functional analysis
Wukitsch, M. W. (1987) · International journal of clinical monitoring and computing · doi:10.1007/bf02915903 · Cited by 28
KIM, J. M., Arakawa, K., & VonLINTEL, T. (1975) · Anesthesia & Analgesia · doi:10.1213/00000539-197505000-00005 · Cited by 28
Clinical signs in medicine: pulsus paradoxus.
Khasnis, A. A., & Lokhandwala, Y. Y. (2002) · PubMed · Cited by 27
Feissel, M., Kalakhy, R., Banwarth, P., Badie, J. C., Pavon, A., Faller, J.-P., & Quenot, J. (2013) · Journal of Critical Care · doi:10.1016/j.jcrc.2013.03.011 · Cited by 26
Hengy, B., Gazon, M., Schmitt, Z., Benyoub, K., Bonnet, A., Viale, J. P., & Aubrun, F. (2012) · Anesthesiology · doi:10.1097/aln.0b013e3182700901 · Cited by 23
Skin Vasomotor Reflex as a Measure of Depth of Anesthesia
Ezri, T., Steinmetz, A., Geva, D., & Szmuk, P. (1998) · Anesthesiology · doi:10.1097/00000542-199811000-00041 · Cited by 20
Pälve, H., & Vuori, A. (1991) · Journal of Cardiothoracic and Vascular Anesthesia · doi:10.1016/1053-0770(91)90154-l · Cited by 19
Oscillations in the Plethysmographic Waveform Amplitude: Phenomenon Hides Behind Artifacts
Cannesson, M. P., Alian, A. A., & Shelley, K. H. (2009) · Anesthesiology · doi:10.1097/aln.0b013e3181a86032 · Cited by 18
Visual estimation of pulse pressure variation is not reliable: a randomized simulation study
Rinehart, J. B., Islam, T., Boud, R., Nguyen, A., Alexander, B. S., Canales, C., & Cannesson, M. P. (2012) · Journal of Clinical Monitoring and Computing · doi:10.1007/s10877-012-9359-8 · Cited by 17
Thiele, R. H., Colquhoun, D. A., Blum, F. E., & Durieux, M. E. (2012) · Anesthesia & Analgesia · doi:10.1213/ane.0b013e31824d5fa1 · Cited by 14
Sympathetic Recovery Following Lumbar Epidural and Spinal Analgesia
Kim, J. M., LaSALLE, A. D., & Parmley, R. T. (1977) · Anesthesia & Analgesia · doi:10.1213/00000539-197705000-00007 · Cited by 13
Nilsson, L. M., Goscinski, T., Lindenberger, M., Länne, T., & Johansson, A. (2010) · Physiological Measurement · doi:10.1088/0967-3334/31/7/006 · Cited by 12
Patent Medicine and The ???Black Box???
Ruskin, K. J., & Shelley, K. H. (2005) · Anesthesia & Analgesia · doi:10.1213/01.ane.0000148122.25862.a1 · Cited by 12
Thiele, R. H., Colquhoun, D. A., Patrie, J. T., Nie, S. H., & Huffmyer, J. L. (2011) · Journal of Cardiothoracic and Vascular Anesthesia · doi:10.1053/j.jvca.2011.07.004 · Cited by 9
Thiele, R. H., Colquhoun, D. A., Forkin, K. T., & Durieux, M. E. (2013) · Journal of Medical Engineering & Technology · doi:10.3109/03091902.2013.822027 · Cited by 7
Role of the Photoplethysmographic Waveform in the Care of High-risk Surgical Patients
Shelley, K. H., Alian, A. A., & Shelley, A. J. (2013) · Anesthesiology · doi:10.1097/aln.0b013e31829101fa · Cited by 5
Use of a pulse oximeter for determination of systolic blood pressure in a helicopter air ambulance
Mohler, J., & Hart, S. C. (1994) · Air Medical Journal · doi:10.1016/s1067-991x(05)80290-1 · Cited by 4
Use of a pulse oximeter during performance of an axillary plexus block.
Okuda, Y., Kitajima, T., & Asai, T. (1997) · PubMed · Cited by 4
Research works printed but not linked: 3
- Hertzman, 1937, Observations on the finger volume pulse recorded photoelectrically, Am J Physiol, 119, 334
- August, 1851, Versuch der absorptions-verhaltnisse des cordierites fur rothes licht zu bestimmen, Ann Physik Chem Ger, 84, 37
- Shelley, 2005, The effect of venous pulsation on the forehead pulse oximeter wave form as a possible source of error in SpO2 calculation, Anesth Analg, 100, 743, 10.1213/01.ANE.0000145063.01043.4B · DOI · Paper page
Cited by
Sorted by citations
Photoplethysmogram Analysis and Applications: An Integrative Review
Park, J., Seok, H. S., Kim, S.-S., & Shin, H. (2022) · Frontiers in Physiology · doi:10.3389/fphys.2021.808451 · Cited by 514
Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring
Fine, J., Branan, K. L., Rodriguez, A. J., Boonya-ananta, T., Ajmal, Ramella-Roman, J. C., McShane, M. J., & Coté, G. L. (2021) · Biosensors · doi:10.3390/bios11040126 · Cited by 348
Advances in Photopletysmography Signal Analysis for Biomedical Applications
Moraes, J. L., Rocha, M. X., Vasconcelos, G. G., Vasconcelos Filho, J. E., De Albuquerque, V. H. C., & Alexandria, A. R. (2018) · Sensors · doi:10.3390/s18061894 · Cited by 292
Optical blood pressure estimation with photoplethysmography and FFT-based neural networks
Xing, X., & Sun, M. (2016) · Biomedical Optics Express · doi:10.1364/boe.7.003007 · Cited by 263
Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study
Natarajan, A., Pantelopoulos, A., Emir-Farinas, H., & Natarajan, P. (2020) · The Lancet Digital Health · doi:10.1016/s2589-7500(20)30246-6 · Cited by 229
Metadata
- Authors
- Alian, A. A., & Shelley, K. H.
- Affiliations
- Yale University (US)
- Corresponding author
- Shelley, Kirk H.
- Venue
- Best Practice & Research Clinical Anaesthesiology
- Publisher
- Elsevier BV
- Published
- 2014-12
- Volume
- 28
- Issue
- 4
- Pages
- 395-406
- ISSN
- 1521-6896 (ISSN-L)
- 1753-3740
- OpenAlex
- W4245509891
- Cited by
- 289
- References
- 83
- Citations by year
- 2026: 18 · 2025: 45 · 2024: 36 · 2023: 44 · 2022: 37 · 2021: 25 · 2020: 20 · 2019: 21 · 2018: 17 · 2017: 8 · 2016: 7 · 2015: 9
- FWCI
- 4.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Best practice & research. Clinical anaesthesiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Health Sciences › Medicine › Surgery › Hemodynamic Monitoring and Therapy
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Health and Disease Prevention
- Keywords
- photoplethysmography, pulse oximetry, arrhythmia monitoring, oxygen saturation, heart rate, hypovolemia, early goal-directed therapy, fluid management, vasopressors, inotropic agents
- MeSH terms
- Hemodynamics, Humans, Oximetry, Photoplethysmography, Hypovolemia
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