Maternal and fetal effects of the supine and pelvic tilt positions in late pregnancy
Abstract
Material and fetal cardiovascular effects of position change were assessed in 20 women in late pregnancy. On changing from the left lateral to the supine position, there was a 45% reduction in leg blood flow, measured by strain guage plethysmography. Arterial resistance, measured with Doppler ultrasound in the femoral, brachial and uterine arteries, remained unchanged, confirming the absence of compensatory vasoconstriction. There was no change in blood pressure (BP) in the leg, indicating no significant aortic compression, but a rise in maternal heart rate in the supine position suggested the presence of inferior vena cava (IVC) compression. Neither the left or the right pelvic-tilt position was associated with a significant change in leg blood flow or maternal heart rate compared to the supine position. A possible 'sluice' effect in the placental circulation was not confirmed, as fetal heart rate and umbilical Doppler resistance did not change in any position. In the absence of active vasoconstriction and significant aortic compression, IVC compression is the likely cause of the decrease in leg blood flow, and also of the previously demonstrated decrease in uterine blood flow. Leg BP and Doppler ultrasound measurements of uterine artery resistance may not be adequate measures of the effect of posture on uteroplacental perfusion.
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The supine position is often avoided given worse uteroplacental perfusion because of maternal hypotension and prolonged labor.
“The supine position is often avoided given worse uteroplacental perfusion because of maternal hypotension (42) and prolonged labor (43).”
From Comprehensive pregnancy monitoring with a network of wireless, soft, and flexible sensors in high- and low-resource health settings (2021) · cites this paper as [42]
Cites
(1971) · Annals of Internal Medicine · doi:10.7326/0003-4819-75-6-991_4 · Cited by 2,388 · see citing works
(1992) · Comparative Biochemistry and Physiology Part A Physiology · doi:10.1016/0300-9629(92)90560-d · Cited by 1,040 · see citing works
NEW DOPPLER TECHNIQUE FOR ASSESSING UTEROPLACENTAL BLOOD FLOW
Campbell, S. C., Griffin, D. R., Pearce, J. M., DIAZ‐RECASENS, J., Cohen‐Overbeek, T. E., Willson, K., & Teague, M. J. (1983) · The Lancet · doi:10.1016/s0140-6736(83)91970-0 · Cited by 574 · see citing works
Studies of the Inferior Vena Cava in Late Pregnancy
Kerr, M. G., Scott, D. B., & Samuel, E. (1964) · BMJ · doi:10.1136/bmj.1.5382.522 · Cited by 361 · see citing works
The circulatory effects of recumbent postural change in late pregnancy.
Lees, M. M., Db, S., Mg, K., & Sh, T. (1967) · PubMed · Cited by 152 · see citing works
Principles and Practice of Obstetric Anæsthesia
(1960) · The Medical Journal of Australia · doi:10.5694/j.1326-5377.1960.tb62811.x · Cited by 149 · see citing works
TIME AND LATERAL TILT AT CAESAREAN SECTION
Crawford, J. S., BURTON, M., & Davies, P. (1972) · British Journal of Anaesthesia · doi:10.1093/bja/44.5.477 · Cited by 137 · see citing works
INFERIOR VENA CAVAL PRESSURE IN LATE PREGNANCY
SCOTT, D. B., & Kerr, M. G. (1963) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.1963.tb15051.x · Cited by 117 · see citing works
Decreased intervillous and unchanged myometrial blood flow in supine recumbency.
Kauppila, A., Koskinen, M., Puolakka, J. O., Tuimala, R. J., & Kuikka, J. (1980) · PubMed · Cited by 59 · see citing works
TIME AND LATERAL TILT AT CAESAREAN SECTION
Crawford, J. S., BURTON, M., & Davies, P. (1973) · Survey of Anesthesiology · doi:10.1097/00132586-197306000-00040 · Cited by 55 · see citing works
Umbilical blood flow velocity waveforms in different maternal positions and with epidural analgesia.
Gf, M., Patel, S., Ja, B., Farmakides, G., & Schulman, H. (1986) · PubMed · Cited by 53 · see citing works
Importance of the lateral position during labor.
Goodlin, R. C. (1971) · PubMed · Cited by 52 · see citing works
Giles, W. B., Lah, F. X., & Trudinger, B. (1987) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.1987.tb02253.x · Cited by 51 · see citing works
Sluice flow in placenta: maternal vascular pressure effects on fetal circulation
Power, G., & Ld, L. (1973) · American Journal of Physiology-Legacy Content · doi:10.1152/ajplegacy.1973.225.6.1490 · Cited by 43 · see citing works
Principles and practice of obstetric anaesthesia
(1960) · American Journal of Obstetrics and Gynecology · doi:10.1016/0002-9378(60)90658-x · Cited by 38 · see citing works
Umbilical Blood Flow Velocity Waveforms in Different Maternal Positions and with Epidural Analgesia
Marx, G. F., Patel, S. R., Berman, J., Farmakides, G., & Schulmanm, H. (1987) · Obstetric Anesthesia Digest · doi:10.1097/00132582-198704000-00006 · Cited by 37 · see citing works
Cardiac output and the recumbent position in late pregnancy
Newman, B., DERRINGTON, C., & Doré, C. J. (1983) · Anaesthesia · doi:10.1111/j.1365-2044.1983.tb10455.x · Cited by 31 · see citing works
Hazards of the Supine Position in Pregnancy
Marx, G. F., & Bassell, G. M. (1982) · Clinics in Obstetrics and Gynaecology · doi:10.1016/s0306-3356(21)00202-8 · Cited by 26 · see citing works
Kidney function after renal arterial embolism
Fergus, J. N., Jones, N. F., & Thomas, M. L. (1969) · BMJ · doi:10.1136/bmj.4.5683.586-a · Cited by 25 · see citing works
Fetal blood flow velocity waveforms in relation to changing peripheral vascular resistance
Noordam, M. J., Wladimiroff, J. W., Lotgering, F. K., Struijk, P. C., & Tonge, H. M. (1987) · Early Human Development · doi:10.1016/0378-3782(87)90045-4 · Cited by 25 · see citing works
Miles, R. D., Menke, J. A., Bashiru, M., & Colliver, J. A. (1987) · Journal of Ultrasound in Medicine · doi:10.7863/jum.1987.6.10.597 · Cited by 25 · see citing works
Effects of Posture on Limb Blood Flow in Late Pregnancy
Drummond, G., Scott, S. E. M., Lees, M. M., & SCOTT, D. B. (1974) · BMJ · doi:10.1136/bmj.2.5919.587 · Cited by 21 · see citing works
Nonstress Test and Maternal Position
Abitbol, M. M., Monheit, A. G., POJE, J., & BAKER, A. M. (1986) · Obstetrics and Gynecology · doi:10.1097/00006250-198609000-00004 · Cited by 21 · see citing works
Hemodynamic studies in experimental toxemia of the dog.
Mm, A. (1977) · PubMed · Cited by 18 · see citing works
Posture and epidural block in pregnant women at term
Weaver, J. B., Pearson, J. F., & ROSEN, M. (1975) · Anaesthesia · doi:10.1111/j.1365-2044.1975.tb00950.x · Cited by 16 · see citing works
AORTOCAVAL COMPRESSION AND PLASMA CONCENTRATIONS OF THIOPENTONE AT CAESAREAN SECTION
Morgan, D., Paull, J. D., Toh, C.-H., & Blackman, G. L. (1984) · British Journal of Anaesthesia · doi:10.1093/bja/56.4.349 · Cited by 14 · see citing works
The effect of maternal position on uterine artery flow during antepartum fetal heart rate testing
Witter, F. R., & Besinger, R. E. (1989) · American Journal of Obstetrics and Gynecology · doi:10.1016/0002-9378(89)90450-x · Cited by 13 · see citing works
The effect of position and delay on stroke and minute distance in late pregnancy
Rawles, J. M., Schneider, K. T. M., Hugh, R., & Huch, A. (1987) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.1987.tb03141.x · Cited by 11 · see citing works
The influence of lateral tilt on limb blood flow in advanced pregnancy.
Jw, D., & Lt, B. (1976) · PubMed · Cited by 4 · see citing works
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Societies, O. P. (2002) · Cited by 675 · see citing works
Abduljalil, K., Furness, P., Johnson, T. N., Rostami-Hodjegan, A., & Soltani, H. (2012) · Clinical Pharmacokinetics · doi:10.2165/11597440-000000000-00000 · Cited by 371 · see citing works
Higuchi, H., Takagi, S., Zhang, K., Furui, I., & Ozaki, M. (2015) · Anesthesiology · doi:10.1097/aln.0000000000000553 · Cited by 139 · see citing works
Bamber, J. H., & Dresner, M. (2003) · Anesthesia & Analgesia · doi:10.1213/01.ane.0000067400.79654.30 · Cited by 136 · see citing works
Lee, S. W. Y., Khaw, K. S., Kee, W. D. N., Leung, T. Y., & Critchley, L. A. H. (2012) · British Journal of Anaesthesia · doi:10.1093/bja/aes349 · Cited by 132 · see citing works
Ryu, D., Kim, D. H., Price, J. T., Lee, J. Y., Chung, H. U., Allen, E., Walter, J. R., Jeong, H., Cao, J., Kulikova, E., et al. (2021) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2100466118 · Cited by 105 · see citing works
Uterine blood flow during supine rest and exercise after 28 weeks of gestation
Jeffreys, R., Stepanchak, W., Lopez, B., Hardis, J., & Jf, C. (2006) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.2006.01056.x · Cited by 101 · see citing works
Dahlgren, G., Granath, F., Wessel, H., & Irestedt, L. (2007) · International Journal of Obstetric Anesthesia · doi:10.1016/j.ijoa.2006.10.006 · Cited by 72 · see citing works
Stone, P. R., Burgess, W., McIntyre, J. P. R., Gunn, A. J., Lear, C. A., Bennet, L., Mitchell, E. A., Thompson, J. M. D., & the Maternal Sleep In Pregnancy Research Group, T. U. O. A. (2017) · The Journal of Physiology · doi:10.1113/jp273201 · Cited by 65 · see citing works
Reducing aortocaval compression: how much tilt is enough?
Kinsella, S. M., WHITWAM, J. G., & Spencer, J. A. D. (1992) · BMJ · doi:10.1136/bmj.305.6853.539 · Cited by 53 · see citing works
Self-citationThe effect of maternal supine position on umbilical and cerebral blood flow indices
Khatib, N., Weiner, Z., Beloosesky, R., Vitner, D., & Thaler, I. (2014) · European Journal of Obstetrics & Gynecology and Reproductive Biology · doi:10.1016/j.ejogrb.2013.12.043 · Cited by 47 · see citing works
Aortocaval Compression Syndrome: Time to Revisit Certain Dogmas
Lee, A. J., & Landau, R. (2017) · Anesthesia & Analgesia · doi:10.1213/ane.0000000000002313 · Cited by 47 · see citing works
Self-citationThe effect of maternal posture on fetal cerebral oxygenation during labour
Aldrich, C. J., D’Antona, D., Spencer, J. A. D., Wyatt, J. S., Peebles, D., Delpy, D. T., & Reynolds, E. O. R. (1995) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.1995.tb09019.x · Cited by 46 · see citing works
Self-citationEffects of maternal prone position on the umbilical arterial flow
Nakai, Y., Mine, M., 西尾, 順., Maeda, T., Imanaka, M., & Ogita, S. (1998) · Acta Obstetricia Et Gynecologica Scandinavica · doi:10.1034/j.1600-0412.1998.771003.x · Cited by 44 · see citing works
Typical sleep positions in pregnant women
O'Brien, L. M., & Warland, J. (2014) · Early Human Development · doi:10.1016/j.earlhumdev.2014.03.001 · Cited by 37 · see citing works
Cardiopulmonary Resuscitation in Pregnancy
Atta, E., & Gardner, M. O. (2007) · Obstetrics and Gynecology Clinics of North America · doi:10.1016/j.ogc.2007.06.008 · Cited by 36 · see citing works
Fields, J. M., Catallo, K., Au, A. K., Rotte, M., Leventhal, D. M., Weiner, S., & Ku, B. S. (2012) · Resuscitation · doi:10.1016/j.resuscitation.2012.11.011 · Cited by 35 · see citing works
Robertson, N., Turner, J., & Kumar, S. (2019) · Sleep Medicine Reviews · doi:10.1016/j.smrv.2019.04.006 · Cited by 31 · see citing works
Ramsay, G., Paglia, M. J., & Bourjeily, G. R. (2012) · Journal of Intensive Care Medicine · doi:10.1177/0885066611432405 · Cited by 29 · see citing works
Kienzl, D., Berger‐Kulemann, V., Kasprian, G. J., Brugger, P. C., Weber, M., Bettelheim, D., Pusch, F., & Prayer, D. (2013) · Journal of Perinatal Medicine · doi:10.1515/jpm-2013-0182 · Cited by 28 · see citing works
Matorras, R., Tacuri, C., Nieto, A., de Terán, G. G., & Cortés, J. (1998) · Journal of Perinatal Medicine · doi:10.1515/jpme.1998.26.4.284 · Cited by 28 · see citing works
The effect of maternal position on venous return for pregnant women during MRI
Hughes, E., Price, A. N., McCabe, L., Hiscocks, S., Waite, L., Green, E., Hutter, J. M., Baruteau, K. P., Cordero‐Grande, L., Edwards, A. D., et al. (2021) · NMR in Biomedicine · doi:10.1002/nbm.4475 · Cited by 27 · see citing works
Kember, A. J., Scott, H. M., O'Brien, L. M., Borazjani, A., Butler, M. B., Wells, J., Isaac, A., Chu, K., Coleman, J., & Morrison, D. (2018) · BMJ Open · doi:10.1136/bmjopen-2017-020256 · Cited by 26 · see citing works
Modifying Maternal Sleep Position in Late Pregnancy Through Positional Therapy: A Feasibility Study
Warland, J., Dorrian, J., Kember, A. J., Phillips, C., Borazjani, A., Morrison, J. L., & O'Brien, L. M. (2018) · Journal of Clinical Sleep Medicine · doi:10.5664/jcsm.7280 · Cited by 25 · see citing works
Effect of lateral versus supine wedged position on development of spinal blockade and hypotension
Hartley, H., Seed, P. T., Ashworth, H. K., Kubli, M., O’Sullivan, G., & Reynolds, F. (2001) · International Journal of Obstetric Anesthesia · doi:10.1054/ijoa.2001.0853 · Cited by 23 · see citing works
Cronin, R. S., Chelimo, C., Mitchell, E. A., Okesene-Gafa, K. A. M., Thompson, J., Taylor, R. S., Hutchison, B. L., & McCowan, L. M. E. (2017) · BMC Pregnancy and Childbirth · doi:10.1186/s12884-017-1378-5 · Cited by 23 · see citing works
Hypotension due to spinal anesthesia influences fetal circulation in primary caesarean sections
Látó, K., Bekes, I., Widschwendter, P., Friedl, T. W. P., Janni, W., Reister, F., Froeba, G., & Friebe-Hoffmann, U. (2018) · Archives of Gynecology and Obstetrics · doi:10.1007/s00404-017-4641-0 · Cited by 21 · see citing works
Obstetric anaesthesia and peripartum management
Turnbull, J., & Bell, R. (2014) · Best Practice & Research Clinical Obstetrics & Gynaecology · doi:10.1016/j.bpobgyn.2014.03.008 · Cited by 18 · see citing works
Zatik, J., Major, T., Aranyosi, J. K., Molnár, C., Limburg, M., & Fülesdi, B. (2001) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1016/s0306-5456(00)00095-4 · Cited by 18 · see citing works
Determining uterine blood flow in pregnancy with magnetic resonance imaging
Pates, J. A., Hatab, M. R., McIntire, D. D., Cunningham, F. G., & Twickler, D. M. (2010) · Magnetic Resonance Imaging · doi:10.1016/j.mri.2009.12.009 · Cited by 15 · see citing works
Transient fetal blood redistribution associated with maternal supine position
Silva, K. P., Hamamoto, T. E. N. K., & Nomura, R. M. Y. (2016) · Journal of Perinatal Medicine · doi:10.1515/jpm-2016-0288 · Cited by 15 · see citing works
Supine hypotensive syndrome of pregnancy: A review of current knowledge.
Massoth, C., Chappell, D., Kranke, P., & Wenk, M. (2022) · PubMed · doi:10.1097/eja.0000000000001554 · Cited by 12 · see citing works
Outcomes of Sleep Disordered Breathing in Pregnancy
Bourjeily, G. R., Mazer, J. M., & Paglia, M. J. (2013) · The Open Sleep Journal · doi:10.2174/1874620901306010028 · Cited by 11 · see citing works
Cardiac Arrest During Pregnancy
Montufar‐Rueda, C., & Gei, A. F. (2014) · Clinical Obstetrics & Gynecology · doi:10.1097/grf.0000000000000075 · Cited by 10 · see citing works
Coleman, J., Okere, M., Seffah, J. D., Kember, A. J., O'Brien, L. M., Borazjani, A., Butler, M. B., Wells, J., MacRitchie, S., Isaac, A., et al. (2019) · BMJ Open · doi:10.1136/bmjopen-2018-022981 · Cited by 8 · see citing works
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Novel strategies to prevent stillbirth
Warland, J., Mitchell, E. A., & O'Brien, L. M. (2017) · Seminars in Fetal and Neonatal Medicine · doi:10.1016/j.siny.2017.01.005 · Cited by 6 · see citing works
Ishkova, A., Wilson, D. L., Howard, M. E., Walker, S. P., Barnes, M., Nicholas, C. L., & Jordan, A. S. (2020) · The Journal of Maternal-Fetal & Neonatal Medicine · doi:10.1080/14767058.2020.1789583 · Cited by 6 · see citing works
Umbilical Doppler Velocimetry: Normative Data and Diagnostic Efficacy
Maulik, D. (2005) · Springer eBooks · doi:10.1007/3-540-28903-8_10 · Cited by 4 · see citing works
Ludwig, D. R., Tsai, R., Raptis, D. A., & Mellnick, V. M. (2020) · Springer eBooks · doi:10.1007/978-3-030-42722-1_5 · Cited by 4 · see citing works
Leg swelling due to urinary obstruction
Lokhandwala, J., & Gornik, H. L. (2006) · Vascular Medicine · doi:10.1177/1358863x06073443 · Cited by 4 · see citing works
Effects of Right Lateral Position on Changes of Fetal Hemodynamics in Late Pregnancy
Wu, S., Liao, G., & Yang, J. (2023) · Journal of Ultrasound in Medicine · doi:10.1002/jum.16261 · Cited by 3 · see citing works
The management of intrapartum ‘fetal distress’
Strachan, B. K. (2009) · Cambridge University Press eBooks · doi:10.1017/cbo9780511635489.007 · Cited by 2 · see citing works
Management of the unconscious pregnant patient
Panday, M., & Moodley, J. (2009) · Best Practice & Research Clinical Obstetrics & Gynaecology · doi:10.1016/j.bpobgyn.2009.01.003 · Cited by 2 · see citing works
The management of intrapartum fetal distress
Arulkumaran, S. (1994) · Fetal and Maternal Medicine Review · doi:10.1017/s0965539500000966 · Cited by 2 · see citing works
Thebridge, L. N., Fisher, C., Puttaswamy, V., Pollock, C. A., & Clarke, J. (2025) · Ultrasound · doi:10.1177/1742271x251320546 · Cited by 1 · see citing works
Assessment of Maternal Sleeping Habits and Knowledge among Pakistani Pregnant Women
Syed, T. P., Faheem, S., & Haque, A. B. (2022) · Indian Journal of Sleep Medicine · doi:10.5005/jp-journals-10069-0102 · Cited by 1 · see citing works
Umbilical Doppler Velocimetry: Normative Data and Diagnostic Efficacy
Maulik, D., Schrufer-Poland, T. L., & Williams, E. M. (2023) · Springer eBooks · doi:10.1007/978-3-031-06189-9_14 · Cited by 1 · see citing works
Üçüncü trimester gebelerde supin ve sol yan pozisyonlarda umblikal arter rezistansının kıyaslanması
Coşkun, A. D. E. (2012) · Bakirkoy Tip Dergisi / Medical Journal of Bakirkoy · doi:10.5350/btdmjb201309202
Umbilical Artery Flow Velocity in Pregnancy Induced Hypertension at Third Trimester
esawi, R. W. A., Edan, B. J., & Shukur, Z. Y. H. (2021) · Kufa Medical Journal · doi:10.36330/kmj.v17i1.1952
Ferlengez, A. G., & Aslan, D. D. (2019) · Medical Bulletin of Haseki · doi:10.4274/haseki.galenos.2018.4546
Haemodynamic Changes during Preterm Birth Treatment
Bednarek, S., Głogiewicz, M., Adamczak, R., & Dubiel, M. (2021) · IntechOpen eBooks · doi:10.5772/intechopen.96923
Best Practice & Research Clinical Obstetrics and Gynaecology
Turnbull, J., Bell, R., & Anaesthetist, C. (2014)
The Management of Intrapartum ‘Fetal Distress’
Coleman, L., & Strachan, B. K. (2016) · Cambridge University Press eBooks · doi:10.1017/9781316144961.008
Umbilical Doppler Velocimetry: Normative Data and Diagnostic Efficacy
Maulik, D. (1997) · Springer eBooks · doi:10.1007/978-3-642-86441-4_8
Ferlengez, A. G., & Aslan, D. D. (2018) · Medical Bulletin of Haseki · doi:10.4274/haseki.4546
A Case of Transient Unilateral Right Leg Edema Caused by a Markedly Distended Bladder
Yagi, N., Hirata, K., Higashiura, W., Takara, H., & Wake, M. (2023) · Cureus · doi:10.7759/cureus.42914
Joshi, S., Deogade, M. S., & Nesari, T. M. (2024) · International Journal of Ayurvedic Medicine · doi:10.47552/ijam.v15i2.3516
An AI-Adaptive and Multi-sensory Smart Pillow for Alleviating Insomnia During Pregnancy
Yu, Y. (2026) · Lecture notes in computer science · doi:10.1007/978-3-032-29842-3_18
- Authors
- Kinsella, S. M., Lee, A., & Spencer, J. A. D.
- Affiliations
- University of London (GB)
- Venue
- European Journal of Obstetrics & Gynecology and Reproductive Biology
- Publisher
- Elsevier BV
- Published
- 1990-07
- Volume
- 36
- Issue
- 1-2
- Pages
- 11-17
- ISSN
- 0028-2243 (ISSN-L)
- 0301-2115
- OpenAlex
- W2149910933
- Cited by
- 61
- References
- 29
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 6 · 2020: 2 · 2019: 3 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 1 · 2014: 5 · 2013: 2 · 2012: 5
- FWCI
- 0.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- European Journal of Obstetrics & Gynecology and Reproductive Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Medical Research Council
- Topics
- Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Pregnancy-related medical research
- Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
- Keywords
- supine position, pelvic tilt, maternal posture, late pregnancy, leg blood flow, inferior vena cava compression, uteroplacental blood flow, uterine artery resistance, fetal heart rate, maternal heart rate, aortic compression
- MeSH terms
- Analysis of Variance, Arm, Blood Pressure, Female, Fetus, Heart Rate, Heart Rate, Fetal, Humans, Leg, Posture, Pregnancy, Pregnancy Trimester, Third, Regional Blood Flow, Supination, Ultrasonics, Uterus
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