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Published in: BMC Anesthesiology 1/2018

Open Access 01-12-2018 | Research article

Propofol attenuates the increase of sonographic optic nerve sheath diameter during robot-assisted laparoscopic prostatectomy: a randomized clinical trial

Authors: Jihion Yu, Jun Hyuk Hong, Jun-Young Park, Jai-Hyun Hwang, Seong-Sik Cho, Young-Kug Kim

Published in: BMC Anesthesiology | Issue 1/2018

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Abstract

Background

Robot-assisted laparoscopic prostatectomy (RALP) requires pneumoperitoneum and the Trendelenburg position to optimize surgical exposure, which can increase intracranial pressure (ICP). Anesthetic agents also influence ICP. We compared the effects of propofol and sevoflurane on sonographic optic nerve sheath diameter (ONSD) as a surrogate for ICP in prostate cancer patients who underwent RALP.

Methods

Thirty-six patients were randomly allocated to groups receiving propofol (propofol group, n = 18) or sevoflurane (sevoflurane group, n = 18) anesthesia. The ONSD was measured 10 min after induction of anesthesia in the supine position (T1); 5 min (T2), 30 min (T3), and 60 min (T4) after establishing pneumoperitoneum and the Trendelenburg position; and at the end of surgery after desufflation in the supine position (T5). Respiratory and hemodynamic variables were also evaluated.

Results

The ONSD was significantly different between the propofol group and the sevoflurane group at T4 (5.27 ± 0.35 mm vs. 5.57 ± 0.28 mm, P = 0.007), but not at other time points. The ONSDs at T2, T3, T4, and T5 were significantly greater than at T1 in both groups (all P < 0.001). Arterial carbon dioxide partial pressure, arterial oxygen partial pressure, peak airway pressure, plateau airway pressure, systolic blood pressure, pulse pressure variation, body temperature and regional cerebral oxygen saturation, except heart rate, were not significantly different between the two groups.

Conclusions

The ONSD was significantly lower during propofol anesthesia than during sevoflurane anesthesia 60 min after pneumoperitoneum and the Trendelenburg position, suggesting that propofol anesthesia may help minimize ICP changes in robotic prostatectomy patients.

Trial registration

Clinicaltrials.​gov identifier: NCT03271502. Registered August 31, 2017.
Literature
1.
go back to reference Binder J, Kramer W. Robotically-assisted laparoscopic radical prostatectomy. BJU Int. 2001;87(4):408–10.CrossRefPubMed Binder J, Kramer W. Robotically-assisted laparoscopic radical prostatectomy. BJU Int. 2001;87(4):408–10.CrossRefPubMed
2.
go back to reference Rassweiler J, Hruza M, Teber D, Su LM. Laparoscopic and robotic assisted radical prostatectomy--critical analysis of the results. Eur Urol. 2006;49(4):612–24.CrossRefPubMed Rassweiler J, Hruza M, Teber D, Su LM. Laparoscopic and robotic assisted radical prostatectomy--critical analysis of the results. Eur Urol. 2006;49(4):612–24.CrossRefPubMed
3.
go back to reference Berryhill R Jr, Jhaveri J, Yadav R, Leung R, Rao S, El-Hakim A, Tewari A. Robotic prostatectomy: a review of outcomes compared with laparoscopic and open approaches. Urology. 2008;72(1):15–23.CrossRefPubMed Berryhill R Jr, Jhaveri J, Yadav R, Leung R, Rao S, El-Hakim A, Tewari A. Robotic prostatectomy: a review of outcomes compared with laparoscopic and open approaches. Urology. 2008;72(1):15–23.CrossRefPubMed
4.
go back to reference Gainsburg DM. Anesthetic concerns for robotic-assisted laparoscopic radical prostatectomy. Minerva Anestesiol. 2012;78(5):596–604.PubMed Gainsburg DM. Anesthetic concerns for robotic-assisted laparoscopic radical prostatectomy. Minerva Anestesiol. 2012;78(5):596–604.PubMed
5.
go back to reference Halverson A, Buchanan R, Jacobs L, Shayani V, Hunt T, Riedel C, Sackier J. Evaluation of mechanism of increased intracranial pressure with insufflation. Surg Endosc. 1998;12(3):266–9.CrossRefPubMed Halverson A, Buchanan R, Jacobs L, Shayani V, Hunt T, Riedel C, Sackier J. Evaluation of mechanism of increased intracranial pressure with insufflation. Surg Endosc. 1998;12(3):266–9.CrossRefPubMed
6.
go back to reference Park EY, Koo BN, Min KT, Nam SH. The effect of pneumoperitoneum in the steep Trendelenburg position on cerebral oxygenation. Acta Anaesthesiol Scand. 2009;53(7):895–9.CrossRefPubMed Park EY, Koo BN, Min KT, Nam SH. The effect of pneumoperitoneum in the steep Trendelenburg position on cerebral oxygenation. Acta Anaesthesiol Scand. 2009;53(7):895–9.CrossRefPubMed
7.
go back to reference Moss E, Price DJ. Effect of propofol on brain retraction pressure and cerebral perfusion pressure. Br J Anaesth. 1990;65(6):823–5.CrossRefPubMed Moss E, Price DJ. Effect of propofol on brain retraction pressure and cerebral perfusion pressure. Br J Anaesth. 1990;65(6):823–5.CrossRefPubMed
8.
go back to reference Alkire MT, Haier RJ, Barker SJ, Shah NK, Wu JC, Kao YJ. Cerebral metabolism during propofol anesthesia in humans studied with positron emission tomography. Anesthesiology. 1995;82(2):393–403.CrossRefPubMed Alkire MT, Haier RJ, Barker SJ, Shah NK, Wu JC, Kao YJ. Cerebral metabolism during propofol anesthesia in humans studied with positron emission tomography. Anesthesiology. 1995;82(2):393–403.CrossRefPubMed
9.
go back to reference Bundgaard H, von Oettingen G, Larsen KM, Landsfeldt U, Jensen KA, Nielsen E, Cold GE. Effects of sevoflurane on intracranial pressure, cerebral blood flow and cerebral metabolism. A dose-response study in patients subjected to craniotomy for cerebral tumours. Acta Anaesthesiol Scand. 1998;42(6):621–7.CrossRefPubMed Bundgaard H, von Oettingen G, Larsen KM, Landsfeldt U, Jensen KA, Nielsen E, Cold GE. Effects of sevoflurane on intracranial pressure, cerebral blood flow and cerebral metabolism. A dose-response study in patients subjected to craniotomy for cerebral tumours. Acta Anaesthesiol Scand. 1998;42(6):621–7.CrossRefPubMed
10.
go back to reference Matta BF, Heath KJ, Tipping K, Summors AC. Direct cerebral vasodilatory effects of sevoflurane and isoflurane. Anesthesiology. 1999;91(3):677–80.CrossRefPubMed Matta BF, Heath KJ, Tipping K, Summors AC. Direct cerebral vasodilatory effects of sevoflurane and isoflurane. Anesthesiology. 1999;91(3):677–80.CrossRefPubMed
11.
go back to reference Dubost C, Le Gouez A, Jouffroy V, Roger-Christoph S, Benhamou D, Mercier FJ, Geeraerts T. Optic nerve sheath diameter used as ultrasonographic assessment of the incidence of raised intracranial pressure in preeclampsia: a pilot study. Anesthesiology. 2012;116(5):1066–71.CrossRefPubMed Dubost C, Le Gouez A, Jouffroy V, Roger-Christoph S, Benhamou D, Mercier FJ, Geeraerts T. Optic nerve sheath diameter used as ultrasonographic assessment of the incidence of raised intracranial pressure in preeclampsia: a pilot study. Anesthesiology. 2012;116(5):1066–71.CrossRefPubMed
13.
go back to reference Marsh B, White M, Morton N, Kenny GN. Pharmacokinetic model driven infusion of propofol in children. Br J Anaesth. 1991;67(1):41–8.CrossRefPubMed Marsh B, White M, Morton N, Kenny GN. Pharmacokinetic model driven infusion of propofol in children. Br J Anaesth. 1991;67(1):41–8.CrossRefPubMed
14.
go back to reference Minto CF, Schnider TW, Egan TD, Youngs E, Lemmens HJ, Gambus PL, Billard V, Hoke JF, Moore KH, Hermann DJ, et al. Influence of age and gender on the pharmacokinetics and pharmacodynamics of remifentanil. I Model development. Anesthesiol. 1997;86(1):10–23.CrossRef Minto CF, Schnider TW, Egan TD, Youngs E, Lemmens HJ, Gambus PL, Billard V, Hoke JF, Moore KH, Hermann DJ, et al. Influence of age and gender on the pharmacokinetics and pharmacodynamics of remifentanil. I Model development. Anesthesiol. 1997;86(1):10–23.CrossRef
15.
go back to reference Chin JH, Seo H, Lee EH, Lee J, Hong JH, Hwang JH, Kim YK. Sonographic optic nerve sheath diameter as a surrogate measure for intracranial pressure in anesthetized patients in the Trendelenburg position. BMC Anesthesiol. 2015;15:43.CrossRefPubMedPubMedCentral Chin JH, Seo H, Lee EH, Lee J, Hong JH, Hwang JH, Kim YK. Sonographic optic nerve sheath diameter as a surrogate measure for intracranial pressure in anesthetized patients in the Trendelenburg position. BMC Anesthesiol. 2015;15:43.CrossRefPubMedPubMedCentral
16.
go back to reference Rehberg B, Bouillon T, Zinserling J, Hoeft A. Comparative pharmacodynamic modeling of the electroencephalography-slowing effect of isoflurane, sevoflurane, and desflurane. Anesthesiology. 1999;91(2):397–405.CrossRefPubMed Rehberg B, Bouillon T, Zinserling J, Hoeft A. Comparative pharmacodynamic modeling of the electroencephalography-slowing effect of isoflurane, sevoflurane, and desflurane. Anesthesiology. 1999;91(2):397–405.CrossRefPubMed
17.
go back to reference Chui J, Mariappan R, Mehta J, Manninen P, Venkatraghavan L. Comparison of propofol and volatile agents for maintenance of anesthesia during elective craniotomy procedures: systematic review and meta-analysis. Can J Anaesth. 2014;61(4):347–56.CrossRefPubMed Chui J, Mariappan R, Mehta J, Manninen P, Venkatraghavan L. Comparison of propofol and volatile agents for maintenance of anesthesia during elective craniotomy procedures: systematic review and meta-analysis. Can J Anaesth. 2014;61(4):347–56.CrossRefPubMed
18.
go back to reference Talke P, Caldwell JE, Richardson CA. Sevoflurane increases lumbar cerebrospinal fluid pressure in normocapnic patients undergoing transsphenoidal hypophysectomy. Anesthesiology. 1999;91(1):127–30.CrossRefPubMed Talke P, Caldwell JE, Richardson CA. Sevoflurane increases lumbar cerebrospinal fluid pressure in normocapnic patients undergoing transsphenoidal hypophysectomy. Anesthesiology. 1999;91(1):127–30.CrossRefPubMed
19.
go back to reference Oshima T, Karasawa F, Satoh T. Effects of propofol on cerebral blood flow and the metabolic rate of oxygen in humans. Acta Anaesthesiol Scand. 2002;46(7):831–5.CrossRefPubMed Oshima T, Karasawa F, Satoh T. Effects of propofol on cerebral blood flow and the metabolic rate of oxygen in humans. Acta Anaesthesiol Scand. 2002;46(7):831–5.CrossRefPubMed
20.
go back to reference Illievich UM, Petricek W, Schramm W, Weindlmayr-Goettel M, Czech T, Spiss CK. Electroencephalographic burst suppression by propofol infusion in humans: hemodynamic consequences. Anesth Analg. 1993;77(1):155-160. Illievich UM, Petricek W, Schramm W, Weindlmayr-Goettel M, Czech T, Spiss CK. Electroencephalographic burst suppression by propofol infusion in humans: hemodynamic consequences. Anesth Analg. 1993;77(1):155-160.
21.
go back to reference Van Hemelrijck J, Van Aken H, Plets C, Goffin J, Vermaut G. The effects of propofol on intracranial pressure and cerebral perfusion pressure in patients with brain tumors. Acta Anaesthesiol Belg. 1989;40(2):95–100.PubMed Van Hemelrijck J, Van Aken H, Plets C, Goffin J, Vermaut G. The effects of propofol on intracranial pressure and cerebral perfusion pressure in patients with brain tumors. Acta Anaesthesiol Belg. 1989;40(2):95–100.PubMed
22.
go back to reference Mangez JF, Menguy E, Roux P. Sedation by constant-rate propofol in the head-injured patient. Preliminary results. Ann Fr Anesth Reanim. 1987;6(4):336–7.CrossRefPubMed Mangez JF, Menguy E, Roux P. Sedation by constant-rate propofol in the head-injured patient. Preliminary results. Ann Fr Anesth Reanim. 1987;6(4):336–7.CrossRefPubMed
23.
go back to reference Farling PA, Johnston JR, Coppel DL. Propofol infusion for sedation of patients with head injury in intensive care. A preliminary report. Anaesthesia. 1989;44(3):222–6.CrossRefPubMed Farling PA, Johnston JR, Coppel DL. Propofol infusion for sedation of patients with head injury in intensive care. A preliminary report. Anaesthesia. 1989;44(3):222–6.CrossRefPubMed
24.
go back to reference Kahveci FS, Kahveci N, Alkan T, Goren B, Korfali E, Ozluk K. Propofol versus isoflurane anesthesia under hypothermic conditions: effects on intracranial pressure and local cerebral blood flow after diffuse traumatic brain injury in the rat. Surg Neurol. 2001;56(3):206–14.CrossRefPubMed Kahveci FS, Kahveci N, Alkan T, Goren B, Korfali E, Ozluk K. Propofol versus isoflurane anesthesia under hypothermic conditions: effects on intracranial pressure and local cerebral blood flow after diffuse traumatic brain injury in the rat. Surg Neurol. 2001;56(3):206–14.CrossRefPubMed
25.
go back to reference Kim MS, Bai SJ, Lee JR, Choi YD, Kim YJ, Choi SH. Increase in intracranial pressure during carbon dioxide pneumoperitoneum with steep trendelenburg positioning proven by ultrasonographic measurement of optic nerve sheath diameter. J Endourol. 2014;28(7):801–6.CrossRefPubMed Kim MS, Bai SJ, Lee JR, Choi YD, Kim YJ, Choi SH. Increase in intracranial pressure during carbon dioxide pneumoperitoneum with steep trendelenburg positioning proven by ultrasonographic measurement of optic nerve sheath diameter. J Endourol. 2014;28(7):801–6.CrossRefPubMed
26.
go back to reference Whiteley JR, Taylor J, Henry M, Epperson TI, Hand WR. Detection of elevated intracranial pressure in robot-assisted laparoscopic radical prostatectomy using ultrasonography of optic nerve sheath diameter. J Neurosurg Anesthesiol. 2015;27(2):155–9.CrossRefPubMed Whiteley JR, Taylor J, Henry M, Epperson TI, Hand WR. Detection of elevated intracranial pressure in robot-assisted laparoscopic radical prostatectomy using ultrasonography of optic nerve sheath diameter. J Neurosurg Anesthesiol. 2015;27(2):155–9.CrossRefPubMed
27.
go back to reference Robba C, Cardim D, Donnelly J, Bertuccio A, Bacigaluppi S, Bragazzi N, Cabella B, Liu X, Matta B, Lattuada M, et al. Effects of pneumoperitoneum and Trendelenburg position on intracranial pressure assessed using different non-invasive methods. Br J Anaesth. 2016;117(6):783–91.CrossRefPubMed Robba C, Cardim D, Donnelly J, Bertuccio A, Bacigaluppi S, Bragazzi N, Cabella B, Liu X, Matta B, Lattuada M, et al. Effects of pneumoperitoneum and Trendelenburg position on intracranial pressure assessed using different non-invasive methods. Br J Anaesth. 2016;117(6):783–91.CrossRefPubMed
28.
go back to reference Fahy BG, Barnas GM, Nagle SE, Flowers JL, Njoku MJ, Agarwal M. Effects of Trendelenburg and reverse Trendelenburg postures on lung and chest wall mechanics. J Clin Anesth. 1996;8(3):236–44.CrossRefPubMed Fahy BG, Barnas GM, Nagle SE, Flowers JL, Njoku MJ, Agarwal M. Effects of Trendelenburg and reverse Trendelenburg postures on lung and chest wall mechanics. J Clin Anesth. 1996;8(3):236–44.CrossRefPubMed
29.
go back to reference Guerci AD, Shi AY, Levin H, Tsitlik J, Weisfeldt ML, Chandra N. Transmission of intrathoracic pressure to the intracranial space during cardiopulmonary resuscitation in dogs. Circ Res. 1985;56(1):20–30.CrossRefPubMed Guerci AD, Shi AY, Levin H, Tsitlik J, Weisfeldt ML, Chandra N. Transmission of intrathoracic pressure to the intracranial space during cardiopulmonary resuscitation in dogs. Circ Res. 1985;56(1):20–30.CrossRefPubMed
30.
go back to reference Hariri RJ, Firlick AD, Shepard SR, Cohen DS, Barie PS, Emery JM 3rd, Ghajar JB. Traumatic brain injury, hemorrhagic shock, and fluid resuscitation: effects on intracranial pressure and brain compliance. J Neurosurg. 1993;79(3):421–7.CrossRefPubMed Hariri RJ, Firlick AD, Shepard SR, Cohen DS, Barie PS, Emery JM 3rd, Ghajar JB. Traumatic brain injury, hemorrhagic shock, and fluid resuscitation: effects on intracranial pressure and brain compliance. J Neurosurg. 1993;79(3):421–7.CrossRefPubMed
31.
go back to reference Harper AM, Glass HI. Effect of alterations in the arterial carbon dioxide tension on the blood flow through the cerebral cortex at normal and low arterial blood pressures. J Neurol Neurosurg Psychiatry. 1965;28(5):449–52.CrossRefPubMedPubMedCentral Harper AM, Glass HI. Effect of alterations in the arterial carbon dioxide tension on the blood flow through the cerebral cortex at normal and low arterial blood pressures. J Neurol Neurosurg Psychiatry. 1965;28(5):449–52.CrossRefPubMedPubMedCentral
33.
34.
go back to reference Blecha S, Harth M, Schlachetzki F, Zeman F, Blecha C, Flora P, Burger M, Denzinger S, Graf BM, Helbig H, et al. Changes in intraocular pressure and optic nerve sheath diameter in patients undergoing robotic-assisted laparoscopic prostatectomy in steep 45 degrees Trendelenburg position. BMC Anesthesiol. 2017;17(1):40.CrossRefPubMedPubMedCentral Blecha S, Harth M, Schlachetzki F, Zeman F, Blecha C, Flora P, Burger M, Denzinger S, Graf BM, Helbig H, et al. Changes in intraocular pressure and optic nerve sheath diameter in patients undergoing robotic-assisted laparoscopic prostatectomy in steep 45 degrees Trendelenburg position. BMC Anesthesiol. 2017;17(1):40.CrossRefPubMedPubMedCentral
35.
go back to reference Geeraerts T, Merceron S, Benhamou D, Vigue B, Duranteau J. Non-invasive assessment of intracranial pressure using ocular sonography in neurocritical care patients. Intensive Care Med. 2008;34(11):2062–7.CrossRefPubMed Geeraerts T, Merceron S, Benhamou D, Vigue B, Duranteau J. Non-invasive assessment of intracranial pressure using ocular sonography in neurocritical care patients. Intensive Care Med. 2008;34(11):2062–7.CrossRefPubMed
36.
go back to reference Jun IJ, Kim M, Lee J, Park SU, Hwang JH, Hong JH, Kim YK. Effect of mannitol on Ultrasonographically measured optic nerve sheath diameter as a surrogate for intracranial pressure during robot-assisted laparoscopic prostatectomy with pneumoperitoneum and the Trendelenburg position. J Endourol. 2018; https://doi.org/10.1089/end.2017.0828. Jun IJ, Kim M, Lee J, Park SU, Hwang JH, Hong JH, Kim YK. Effect of mannitol on Ultrasonographically measured optic nerve sheath diameter as a surrogate for intracranial pressure during robot-assisted laparoscopic prostatectomy with pneumoperitoneum and the Trendelenburg position. J Endourol. 2018; https://​doi.​org/​10.​1089/​end.​2017.​0828.
37.
go back to reference Bratton SL, Chestnut RM, Ghajar J, McConnell Hammond FF, Harris OA, Hartl R, Manley GT, Nemecek A, Newell DW, Rosenthal G, et al. Guidelines for the management of severe traumatic brain injury. VI. Indications for intracranial pressure monitoring. J Neurotrauma. 2007;24(Suppl 1):S37–44.PubMedCrossRef Bratton SL, Chestnut RM, Ghajar J, McConnell Hammond FF, Harris OA, Hartl R, Manley GT, Nemecek A, Newell DW, Rosenthal G, et al. Guidelines for the management of severe traumatic brain injury. VI. Indications for intracranial pressure monitoring. J Neurotrauma. 2007;24(Suppl 1):S37–44.PubMedCrossRef
38.
go back to reference Blaivas M, Theodoro D, Sierzenski PR. Elevated intracranial pressure detected by bedside emergency ultrasonography of the optic nerve sheath. Acad Emerg Med. 2003;10(4):376–81.CrossRefPubMed Blaivas M, Theodoro D, Sierzenski PR. Elevated intracranial pressure detected by bedside emergency ultrasonography of the optic nerve sheath. Acad Emerg Med. 2003;10(4):376–81.CrossRefPubMed
39.
go back to reference Tayal VS, Neulander M, Norton HJ, Foster T, Saunders T, Blaivas M. Emergency department sonographic measurement of optic nerve sheath diameter to detect findings of increased intracranial pressure in adult head injury patients. Ann Emerg Med. 2007;49(4):508–14.CrossRefPubMed Tayal VS, Neulander M, Norton HJ, Foster T, Saunders T, Blaivas M. Emergency department sonographic measurement of optic nerve sheath diameter to detect findings of increased intracranial pressure in adult head injury patients. Ann Emerg Med. 2007;49(4):508–14.CrossRefPubMed
40.
go back to reference Moretti R, Pizzi B. Optic nerve ultrasound for detection of intracranial hypertension in intracranial hemorrhage patients: confirmation of previous findings in a different patient population. J Neurosurg Anesthesiol. 2009;21(1):16–20.CrossRefPubMed Moretti R, Pizzi B. Optic nerve ultrasound for detection of intracranial hypertension in intracranial hemorrhage patients: confirmation of previous findings in a different patient population. J Neurosurg Anesthesiol. 2009;21(1):16–20.CrossRefPubMed
41.
go back to reference Rajajee V, Vanaman M, Fletcher JJ, Jacobs TL. Optic nerve ultrasound for the detection of raised intracranial pressure. Neurocrit Care. 2011;15(3):506–15.CrossRefPubMed Rajajee V, Vanaman M, Fletcher JJ, Jacobs TL. Optic nerve ultrasound for the detection of raised intracranial pressure. Neurocrit Care. 2011;15(3):506–15.CrossRefPubMed
42.
go back to reference Kristiansson H, Nissborg E, Bartek J Jr, Andresen M, Reinstrup P, Romner B. Measuring elevated intracranial pressure through noninvasive methods: a review of the literature. J Neurosurg Anesthesiol. 2013;25(4):372–85.CrossRefPubMed Kristiansson H, Nissborg E, Bartek J Jr, Andresen M, Reinstrup P, Romner B. Measuring elevated intracranial pressure through noninvasive methods: a review of the literature. J Neurosurg Anesthesiol. 2013;25(4):372–85.CrossRefPubMed
43.
go back to reference Strumwasser A, Kwan RO, Yeung L, Miraflor E, Ereso A, Castro-Moure F, Patel A, Sadjadi J, Victorino GP. Sonographic optic nerve sheath diameter as an estimate of intracranial pressure in adult trauma. J Surg Res. 2011;170(2):265–71.CrossRefPubMed Strumwasser A, Kwan RO, Yeung L, Miraflor E, Ereso A, Castro-Moure F, Patel A, Sadjadi J, Victorino GP. Sonographic optic nerve sheath diameter as an estimate of intracranial pressure in adult trauma. J Surg Res. 2011;170(2):265–71.CrossRefPubMed
Metadata
Title
Propofol attenuates the increase of sonographic optic nerve sheath diameter during robot-assisted laparoscopic prostatectomy: a randomized clinical trial
Authors
Jihion Yu
Jun Hyuk Hong
Jun-Young Park
Jai-Hyun Hwang
Seong-Sik Cho
Young-Kug Kim
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Anesthesiology / Issue 1/2018
Electronic ISSN: 1471-2253
DOI
https://doi.org/10.1186/s12871-018-0523-7

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