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Kamoi S, Pretty CG, Chiew YS, Pironet A, Davidson S, Desaive T, Shaw GM, Chase JG. Stroke Volume estimation using aortic pressure measurements and aortic cross sectional area: Proof of concept. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2015:1005-8. [PMID: 26736434 DOI: 10.1109/embc.2015.7318534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Accurate Stroke Volume (SV) monitoring is essential for patient with cardiovascular dysfunction patients. However, direct SV measurements are not clinically feasible due to the highly invasive nature of measurement devices. Current devices for indirect monitoring of SV are shown to be inaccurate during sudden hemodynamic changes. This paper presents a novel SV estimation using readily available aortic pressure measurements and aortic cross sectional area, using data from a porcine experiment where medical interventions such as fluid replacement, dobutamine infusions, and recruitment maneuvers induced SV changes in a pig with circulatory shock. Measurement of left ventricular volume, proximal aortic pressure, and descending aortic pressure waveforms were made simultaneously during the experiment. From measured data, proximal aortic pressure was separated into reservoir and excess pressures. Beat-to-beat aortic characteristic impedance values were calculated using both aortic pressure measurements and an estimate of the aortic cross sectional area. SV was estimated using the calculated aortic characteristic impedance and excess component of the proximal aorta. The median difference between directly measured SV and estimated SV was -1.4ml with 95% limit of agreement +/- 6.6ml. This method demonstrates that SV can be accurately captured beat-to-beat during sudden changes in hemodynamic state. This novel SV estimation could enable improved cardiac and circulatory treatment in the critical care environment by titrating treatment to the effect on SV.
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Holfeld J, Pölzl L, Graber M, Hirsch J, Lobenwein D, Zipperle J, Blumer M, Kirchmair E, Kirchmair R, Paulus P, Davidson S, Grimm M, Tepeköylü C. miR-19a-3p Containing Exosomes Improve Cardiac Function in Ischemic Myocardium. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1627831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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28
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Davidson S, Bannon A, Gull S, Copeland P, Khosraviani K. Acute Uncomplicated Diverticulitis: Is Ambulatory Care Possible? A Review of Current Practice in an Emergency Surgical Unit. Int J Surg 2017. [DOI: 10.1016/j.ijsu.2017.08.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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McCann C, Davidson S, Leung E, Wright F, Slodkowski E, Hong NL. Breast Ablation Therapy: A Novel Treatment Paradigm for Early Stage Breast Cancer Patients—Preclinical Evaluation in an In Vivo Porcine Breast Model. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.2065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Pironet A, Dauby PC, Chase JG, Morimont P, Janssen N, Lambermont B, Davidson S, Desaive T. A comparison between four techniques to measure cardiac output. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2017; 2016:2717-2720. [PMID: 28268881 DOI: 10.1109/embc.2016.7591291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac output is very difficult to estimate, either in experimental or clinical settings. The goal of this work is to compare four techniques to measure cardiac output: pressure-volume catheter, aortic flow probe, thermodilution, and the PiCCO monitor. These four techniques were simultaneously used during experiments of fluid and endotoxin administration on 7 pigs. Findings show that, first, each individual technique is precise, with a relative coefficient of repeatability lower than 7 %. Second, 1 cardiac output estimate provided by any technique relates poorly to the estimates from the other 3, even if there is only small bias between the techniques. Third, changes in cardiac output detected by one technique are only detected by the others in 62 to 100 % of cases. This study confirms the difficulty of obtaining a reliable clinical cardiac output measurement. Therefore, several measurements using different techniques should be performed, if possible, and all such should be treated with caution.
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Tyser R, Miranda A, Davidson S, Srinivas S, Riley P. 5730Initiation of the first heart beat and its role in cardiomyocyte differentiation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.5730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tepekoylu C, Poelzl L, Graber M, Hirsch J, Lobenwein D, Zipperle J, Blumer M, Kirchmair E, Kirchmair R, Paulus P, Davidson S, Grimm M, Holfeld J. 5921miR-19a-3p containing exosomes improve cardiac function in ischemic myocardium. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.5921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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33
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Peters M, Brown D, Whelan L, Davidson S, Uranis C, Reece K, Spira N. PERSON-CENTERED LANGUAGE FOR RESPONSIVE BEHAVIOURS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Davidson S, Emonts R, Rotman M. ASSESSMENT, HOME SAFETY AND THE COGNITIVE PERFORMANCE TEST: A DISCONNECT IN PRACTICE OR PURPOSE? Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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35
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Davidson S, Schulz M. INTIMACY, SEXUALITY AND DEMENTIA: THE LAST TABOO. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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36
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Gilbert A, Davidson S, Velikova G, Sebag-Montefiore D. SP-0519: Collecting PROs in clinical practice to assess radiotherapy toxicity and develop normal tissue complication probability models. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)30959-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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37
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Joseph N, McWilliam A, Chang-Claude J, Davidson S, Johnson K, Rancati T, Talbot C, Webb A, West C, Choudhury A. PO-0754: Whole body Integral dose is associated with radiotherapy related fatigue in prostate cancer. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Doo D, Guy M, Behbakht K, Davidson S, Sheeder J, Guntupalli S. Effect of preoperative chemotherapy on postoperative morbidity and mortality in patients undergoing surgery for ovarian cancer. Gynecol Oncol 2015. [DOI: 10.1016/j.ygyno.2015.03.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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39
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Talbot C, Azria D, Brookes A, Burr T, ChangClaude J, Davidson S, De uysscher D, Dunning A, Elliott R, Gutiérrez Enríquez S, Lambin P, Rancati T, Rosenstein B, Seibold P, Symonds R, Thierens H, Valdagni R, Vega A, Wenz F, Yuille M, West C. SP-0169: Validating predictive models and biomarkers for radiotherapy toxicity: the REQUITE project. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40167-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Holch P, Davidson S, Routledge J, Henry A, Franks K, Gilbert A, Bamforth L, Absolom K, Velikova G. OC-0416: eRAPID: Electronic self-report and management of adverse-events for radical prostate radiotherapy (RT) patients. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40412-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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41
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Davidson S, Spowart K. Lessons to be learned from partnerships with families: a case study. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/edn.16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Glosson K, Hopkins B, Washburn S, Davidson S, Smith G, Earleywine T, Ma C. Effect of supplementing pasteurized milk balancer products to heat-treated whole milk on the growth and health of dairy calves. J Dairy Sci 2015; 98:1127-35. [DOI: 10.3168/jds.2014-8567] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 10/25/2014] [Indexed: 11/19/2022]
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43
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West C, Azria D, Chang-Claude J, Davidson S, Lambin P, Rosenstein B, De Ruysscher D, Talbot C, Thierens H, Valdagni R, Vega A, Yuille M. The REQUITE project: validating predictive models and biomarkers of radiotherapy toxicity to reduce side-effects and improve quality of life in cancer survivors. Clin Oncol (R Coll Radiol) 2014; 26:739-42. [PMID: 25267305 DOI: 10.1016/j.clon.2014.09.008] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 09/04/2014] [Indexed: 12/25/2022]
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44
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Fox A, Davidson S, McGinnis R, Cain S, Saunders N, McLean S. Exploring the use of wireless inertial measurement units for biomechanical analysis of side-step cutting manoeuvres. J Sci Med Sport 2014. [DOI: 10.1016/j.jsams.2014.11.149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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45
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Cappelli M, Davidson S, Racek J, Leon S, Vloet M, Tataryn K, Gillis K, Freeland A, Carver J, Thatte S, Lowe J. Transitioning Youth into Adult Mental Health and Addiction Services: An Outcomes Evaluation of the Youth Transition Project. J Behav Health Serv Res 2014; 43:597-610. [DOI: 10.1007/s11414-014-9440-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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46
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Grassian AR, Parker S, Davidson S, Divakaruni A, Green C, Zhang X, Slocum K, Pu M, Lin F, Vickers C, Joud-Caldwell C, Chung F, Yin H, Handly E, Straub C, Growney JD, Heiden MV, Murphy A, Pagliarini R, Metallo C. Abstract LB-139: IDH1 mutations alter citric acid cycle metabolism and increase dependence on oxidative mitochondrial metabolism. Cancer Res 2014. [DOI: 10.1158/1538-7445.am2014-lb-139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Mutations in the genes encoding isocitrate dehydrogenase 1 and 2 (IDH1/2) occur in a variety of tumor types, resulting in production of the proposed oncometabolite, 2-hydroxyglutarate (2-HG). How mutant IDH alters central carbon metabolism, though, remains unclear. To address this question, we performed 13C metabolic flux analysis (MFA) on an isogenic cell panel containing heterozygous IDH1/2 mutations. We observe a dramatic and consistent decrease in the ability of IDH1, but not IDH2, mutant cell lines to utilize reductive glutamine metabolism via the carboxylation of α-ketoglutarate to isocitrate. Additionally we find that cells with IDH1 mutations exhibit increased oxidative tricarboxylic acid (TCA) metabolism. Similar metabolic trends were observed in vivo as well, and also in endogenous, non-engineered IDH1/2 mutant cell lines. Interestingly, IDH1-mutant specific inhibitors were unable to reverse the decrease in reductive metabolism, suggesting that this metabolic phenotype is independent of 2-HG. Furthermore, this metabolic reprogramming increases the sensitivity of IDH1 mutant cells to hypoxia or electron transport chain (ETC) inhibition in vitro. IDH1 mutant cells also grow poorly as subcutaneous xenografts within hypoxic in vivo microenvironments. These results suggest that exploiting metabolic defects specific to IDH1 mutant cells could be an interesting avenue to explore therapeutically.
Citation Format: Alexandra R. Grassian, Seth Parker, Shawn Davidson, Ajit Divakaruni, Courtney Green, Xiamei Zhang, Kelly Slocum, Minying Pu, Fallon Lin, Chad Vickers, Carol Joud-Caldwell, Franklin Chung, Hong Yin, Erika Handly, Christopher Straub, Joseph D. Growney, Matt Vander Heiden, Anne Murphy, Raymond Pagliarini, Christian Metallo. IDH1 mutations alter citric acid cycle metabolism and increase dependence on oxidative mitochondrial metabolism. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr LB-139. doi:10.1158/1538-7445.AM2014-LB-139
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Burhenn P, Zachariah F, Kildoo C, Shayani S, van Zyl C, Buga S, Davidson S, McLin Y, Hurria A. Implementing an educational initiative to promote sleep. J Geriatr Oncol 2014. [DOI: 10.1016/j.jgo.2014.09.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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48
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Choudhury A, Arthur C, Malik J, Mandall P, Taylor C, Alam N, Tran A, Livsey J, Elliott T, Davidson S, Logue J, Wylie J. Patient-reported Outcomes and Health-related Quality of Life in Prostate Cancer Treated with a Single Fraction of High Dose Rate Brachytherapy Combined with Hypofractionated External Beam Radiotherapy. Clin Oncol (R Coll Radiol) 2014; 26:661-7. [DOI: 10.1016/j.clon.2014.06.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 05/29/2014] [Accepted: 06/23/2014] [Indexed: 11/29/2022]
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49
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Symonds P, Gourley C, Davidson S, West C, Dive C, Paul J, Carty K, McCartney E, Rai D, Banerjee S, Jackson D, Lord R, McCormack M, Hudson E, Reed N, Flubacher M, Jankowska P, Powell M. Circca: a Randomised Double Blind Phase Ii Trial of Carboplatin-Paclitaxel Plus Cediranib Versus Carboplatin-Paclitaxel Plus Placebo in Metastatic/Recurrent Cervical Cancer. (Cruk Grant Ref: C1256/A11416). Ann Oncol 2014. [DOI: 10.1093/annonc/mdu438.26] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Kong R, Trimmings A, Hutchinson N, Gill R, Agarwal S, Davidson S, Arcari M. Consensus recommendations for using the Multiplate®for platelet function monitoring before cardiac surgery. Int J Lab Hematol 2014; 37:143-7. [DOI: 10.1111/ijlh.12279] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Accepted: 06/24/2014] [Indexed: 12/31/2022]
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