Et profilbilde

Professor
Trygve Christian Eftestøl { "honorific-suffix": "Professor", "fn": "Trygve Christian Eftestøl", "tel": "Telefon: 51832035", "email": "trygve.eftestol@uis.no" }

Avdeling/enhet Det teknisk- naturvitenskapelige fakultet
Institutt/senter Institutt for data- og elektroteknikk
Rom KE E-425B
Hjemmeside http://www.ux.uis.no/~trygve-e/

Forskningsområder

The Biomedical data analysis group (part of Helseteknologi-programområdet) at the University of Stavanger has its basis in a number of active researchers with a proven track record. The research area's scope is data analysis encompassing signal and image processing statistical analysis applied to a wide variety of projects within biology and medicine. The group is involved in multidisciplinary research with both national and international collaborators.

The research group is cross disciplinary as it relies increasingly on ideas and approaches taken from a number of scientific disciplines and application areas such as signal and image analysis, statistics, pattern recognintion, biology, chemistry and medicine. The main reseach activites are based on a solid foundation of competencies within these fields as documented by an extensive publications history, held by the scientists associated with the program. The group is also able to develop new methodology were existing methods do not exist.

Utvalgte publikasjoner

Articles in international refereed journals

  1. A. Bahrami Rad, T. Eftestøl, K. Engan, U. Irusta, J.T. Kvaløy, J. Kramer-Johansen, L. Wik, and A.K. Katsaggelos ECG-based Classification of Resuscitation Cardiac Rhythms for Retrospective Data Analysis , IEEE Transactions on Biomedical Engineering (2017)), DOI 10.1109/TBME.2017.2688380, IEEE. 

  2. H. Vu, K. Engan, T. Eftestøl, A. Katsaggelos, S. Jatosh, S.Kusulla, E. Mduma, H. Ersdal Automatic Classification of Resuscitation Activities on Birth-Asphyxiated Newborns using Acceleration and ECG signals , Biomedical Signal Processing and Control 36 (2017) , 20-26.                                                                           
  3. K. Oppedal, K. Engan, T. Eftestøl, M. Beyer and D. Aarsland Classifying Alzheimer's disease, Lewy body dementia, and normal controls using 3D texture analysis in magnetic resonance images, Biomedical Signal Processing and Control 2017, 33, 19-29.
  4. L. Woie, K. Engan, T. Eftestøl, J. T. Kvaløy, S. Ørn The relationship between transmurality of ischemic scars and the heart rate of ventricular tachycardia , Scandinavian Cardiovascular Journal (2015), (ahead-of-print), 1-8.
  5. T.Eftestøl, and L.D.Sherman Towards the Automated Analysis and Database Development of Defibrillator Data from Cardiac Arrest , BioMed Research International, vol. 2014, Article ID 276965, 19 pages, 2014. doi:10.1155/2014/276965
  6. L.P. Kotu, K. Engan, K. Skretting, F. Måløy, S. Ørn, L. Woie, and T. Eftestøl Probability mapping of scarred myocardium using texture and intensity features in CMR images , BioMedical Engineering OnLine, 2013, DOI:10.1186/1475-925X-12-91.
  7. T. Nordseth, D.P. Edelson, D. Bergum, T.M. Olasveengen, T. Eftestøl, R. Wiseth, J.T. Kvaløy, B.S. Abella, and E. Skogvoll Optimal loop duration during the provision of in-hospital advanced life support (ALS) to patients with an initial non-shockable rhythm , Resuscitation, 2013, DOI:10.1016/j.resuscitation.2013.08.261.

Pågående forskning

Analysis of acute medical data

: In Norway there are approximately
3000 annual cases of patients experiencing cardiac arrest outside
hospitals in addition to a significant number in
hospitals. Ongoing research is about developing new signal
processing algorithms and statistical models to interpret,
predict and model the effect that the treatment given by acute
cardiac arrest has on the patient. Various parts of this research
are conducted in collaboration with several research groups, both
nationally and internationally.

Newborn Data Analysis: We have been working together with Laerdal Global Health since 2013 to analyze data from stabilization and resuscitation of newborns. Newborn death is a major problem in the third world, and the hypothesis is that using the child's heart rate during and after childbirth one will be better able to make the right decisions that will increase the child's chance to survive. This is part of a larger project where equipment for measuring important data that documents the treatment and the
child's response to this has been developed. We are already well
in the process of developing methods to effectively analyze the
interaction between treatment and response in the child.

Analysis of magnetic resonance imaging (MR) and intracardial ECG from patients with myocardial infarction: Some patients who have had myocardial infarction will be at increased risk of
arrhythmias and acute cardiac arrest. In this regard, it is
interesting to study changes in the heart's ability to direct
electrical impulses, as such changes can lead to the development
of dangerous arrhythmias. We study MRI images of the heart from
patients with myocardial infarction. We have subprojects that
engage in automatic segmentation of cardiac muscle from
surrounding tissues, and automatic segmentation of scar tissue
from healthy tissues from MR images of the heart. Since there are
hypotheses that there are boundaries between healthy and dead
tissues that induce arrhythmias, we are working to quantify the
degree of injury as a probability mapping of the myocardium where
the likelihood scar is visualized.

Analysis of hyperintense areas in brain resonance imaging (MR)
from patients with dementia
: The purpose of the project is to
investigate whether it is possible to use imaging techniques to
diagnose dementia patients from the MR images. Today, a
combination of markers is used to determine diagnosis. In the
project we look at hyperintense areas in the white substance part
of the brain. These hyperintense areas are known to increase in
size also in normal, as a function of age. However, the size and
location are also linked to different forms of dementia.

Segmentation of cell images and classification of cancer types:
In the department of pathology, SUS, data is collected in the
form of cell samples for bladder cancer with different prognoses
and further development. We use deep learning to develop better
routines and markers to distinguish the different degrees of
bladder cancer.

NEEDED: Verdens største helseundersøkelse av antatt friske
individer som deltar i en mosjonskonkurranse ble gjennomført
under «Nordsjørittet» i 2014. Det ble tatt blodprøver, blodtrykk
og EKG 24t før - , samt 3t og 24t etter rittet fra mer enn 1000
deltakere undersøkt på alle tre tidspunktene.  Det foreligger i
tillegg komplette data fra pulsklokker fra ca. 300 av
disse. Formålet med dette prosjektet er, ved hjelp av
signalbehandling, å utvikle nye metoder for å analysere disse
måledataene. Ønsket er at disse metodene skal kunne bidra til å
indikerer risiko for hjertesykdom og helsegevinst av fysisk
aktivitet.

Arbeidserfaring

2006-present   Professor (full),       

                        Dept. of Electrical Eng. and Comp. Science, University of Stavanger (UiS), Norway

2000-2006      Associate professor

                        Dept. of Electrical Eng. and Comp. Science, UiS, Norway

1995-2000       Engineer at Laerdal Medical AS (part time from 1996)

Vitenskapelige publikasjoner (fra CRISTin)

  • Oppedal, Ketil; Eftestøl, Trygve Christian; Engan, Kjersti; Aarsland, Dag; Beyer, Mona K. (2016). White Matter Lesions and Pattern Recognition in MRI of Neurodegenerative Dementia. Universitetet i Stavanger. ISBN 978-82-7644-674-6. 166 s.
  • Vu, Thi Phuong Huyen; Eftestøl, Trygve Christian; Engan, Kjersti (2016). Respiratory-cardio signal processing and analysis of resuscitation data on newborns in low-resource settings. Universitetet i Stavanger. ISBN 978-82-7644-661-6. 174 s.
  • Eftestøl, Trygve (2000). Signal analysis of out-of-hospital cardiac arrest electrocardiograms for decision support during cardiopulmonary resuscitation. Tapir. 160 s.
  • Khanmohammadi, Mahdieh; Engan, Kjersti; Eftestøl, Trygve Christian; sæland, charlotte; Larsen, Alf Inge (2017). SEGMENTATION OF CORONARY ARTERIES FROM X-RAY ANGIOGRAPHY SEQUENCES DURING CONTRAST FLUID PROPAGATION BY IMAGE REGISTRATION. 2017-11-14 - 2017-11-16.
  • Meinich-Bache, Øyvind; Engan, Kjersti; Eftestøl, Trygve Christian; Austvoll, Ivar (2017). Detecting Chest Compression Depth Using a Smartphone Camera and Motion Segmentation. 2017-06-12 - 2017-06-14.
  • Urdal, Jarle; Engan, Kjersti; Eftestøl, Trygve Christian; Kidanto, Hussein; Yarrot, Ladislaus Blacy; Eilevstjønn, Joar; Ersdal, Hege Langli (2017). Signal Processing and Classification for Identification of Clinically Important Parameters During Neonatal Resuscitation. IEEE Signal Processing Society Malaysia Chapter; 2017-09-12 - 2017-09-14.
  • Eftestøl, Trygve Christian (2015). Biomedical data analysis. Norway Pumps & Pipes; 2015-10-01.
  • Eftestøl, Trygve Christian; Singsaas, Erlend; Engan, Kjersti; Woie, Leik; Ørn, Stein (2015). Automatic Detection of Microvascular Obstruction in Patients with Myocardial Infarction. Computing in Cardiology; 2015-09-06 - 2015-09-09.
  • Engan, Kjersti; Naranjo, Valery; Eftestøl, Trygve; Ørn, Stein; Woie, Leik (2015). Segmentation of LG Enhanced Cardiac MRI. Insticc; 2015-01-12 - 2015-01-15.
  • Vu, Huyen; Eftestøl, Trygve; Engan, Kjersti; Eilevstjønn, Joar; Linde, Jørgen Erland; Ersdal, Hege (2015). Exploratory Analysis of Ventilation Signals from Resuscitation Data of Newborns. Insticc; 2015-01-12 - 2015-01-15.
  • Eftestøl, Trygve; Måløy, Frode; Engan, Kjersti; Kotu, Lasya Priya; Woie, Leik; Ørn, Stein (2014). A Texture-based Probability Mapping for Localisation of Clinically Important Cardiac Segments in the Myocardium in Cardiac Magnetic Resonance Images from Myocardial Infarction Patients. IEEE; 2014-10-27 - 2014-10-30.
  • Engan, Kjersti; Woie, Leik; Eftestøl, Trygve (2014). Defining Angular and Radial Positions and Parameters for Myocardial Pixels in Cardiac MR Images. 2014-09-07 - 2014-09-10.
  • Huyen, Vu; Eftestøl, Trygve; Engan, Kjersti; Eilevstjønn, Joar; Linde, Jørgen Erland; Ersdal, Hege (2014). Exploratory Analysis of Heart Rate Changes in Newborns to Investigate the Effectiveness of Bag-Mask Ventilation. 2014-09-07 - 2014-09-10.
  • Rad, Ali Bahrami; Eftestøl, Trygve; Kvaløy, Jan Terje; Ayala, Unai; Kramer-Johansen, Jo; Engan, Kjersti (2014). Nearest-manifold classification approach for cardiac arrest rhythm interpretation during resuscitation. IEEE; 2014-05-04 - 2014-05-09.
  • Rad, Ali Bahrami; Eftestøl, Trygve; Kvaløy, Jan Terje; Ayala, Unai; Kramer-Johansen, Jo; Engan, Kjersti (2013). Probabilistic Classification Approaches for Cardiac Arrest Rhythm Interpretation during Resuscitation. 2013-09-22 - 2013-09-25.
  • Eftestøl, Trygve (2013). Signal and image processing projects in the biomedical data analysis research group. Mathematics/Physics group, University of Stavanger; 2013-11-25 - 2013-11-27.
  • Engan, Kjersti; Naranjo, Valery; Eftestøl, Trygve; Woie, Leik; Schuchter, Arthur; Ørn, Stein (2013). Automatic Detection of Heart Center in Late Gadolinium Enhanced MRI. 2013-09-25 - 2013-09-28.
  • Engan, Kjersti; Naranjo, Valery; Eftestøl, Trygve; Ørn, Stein; Woie, Leik (2013). Automatic Segmentation of the Epicardium in Late Gadolinium Enhanced Cardiac MR Images. 2013-09-22 - 2013-09-25.
  • Måløy, Frode; Woie, Leik; Eftestøl, Trygve; Engan, Kjersti; Ørn, Stein (2013). Measuring the Degree of Fibrosity of Myocardial Scars from Late Gadolinium- Enhanced Cardiovascular Magnetic Resonance Images. 2013-09-22 - 2013-09-25.
  • Ayala, U; Aramendi, Elisabete; Irusta, Unai; Alonso, E; gonzales-otero, digna; Eftestøl, Trygve; Kramer-Johansen, Jo; Ingason, Andres (2012). Recommendations of the American Heart Association on the rhythm library specifications for the development of shock advice algorithms: Do they reflect the real scenario?.
  • de Gauna, Sofia Ruiz; gonzales-otero, digna; Ruiz, Jesus; Ayala, U; Alonso, E; Eftestøl, Trygve; Kramer-Johansen, Jo (2012). Is rhythm analysis during chest compression pauses for ventilation feasible?.
  • Eftestøl, Trygve (2012). Chest compressions: The good, the bad and the ugly.
  • Eftestøl, Trygve; Kvaløy, Jan Terje; Nilsen, Dennis W.T.; Woie, Leik (2012). Analysis of Intracardiac Electrogram Changes. Computing in Cardiology; 2012-09-09 - 2012-09-12.
  • Eftestøl, Trygve; Woie, Leik; Engan, Kjersti; Kvaløy, Jan Terje; Nilsen, Dennis W.T.; Ørn, Stein (2012). Texture Analysis to Assess Risk of Serious Arrhythmias after Myocardial Infarction. Computing in Cardiology; 2012-09-09 - 2012-09-12.
  • Kotu, Lasya Priya; Engan, Kjersti; Eftestøl, Trygve; Woie, Leik; Ørn, Stein; Katsaggelos, Aggelos (2012). LOCAL BINARY PATTERNS USED ON CARDIAC MRI TO CLASSIFY HIGH AND LOW RISK PATIENT GROUPS. European Association for Signal, Speech, and Image Processin; 2012-08-27 - 2012-08-31.
  • Oppedal, Ketil; Engan, Kjersti; Aarsland, Dag; Beyer, Mona Kristiansen; Tysnes, Ole-Bjørn; Eftestøl, Trygve (2012). Using local binary pattern to classify dementia in MRI. IEEE EMB; 2012-05-02 - 2012-05-05.
  • Kotu, Lasya Priya; Engan, Kjersti; Eftestøl, Trygve; Ørn, Stein; Woie, Leik (2011). Segmentation of Scarred and Non-Scarred Myocardium in LG Enhanced CMR Images using Intensity-Based Textural Analysis. IEEE Engineering in Medecine and biology society; 2011-08-30 - 2011-09-03.
  • Kotu, Lasya Priya; Engan, Kjersti; Eftestøl, Trygve; Ørn, Stein; Woie, Leik (2011). TEXTURE CLASSIFICATION OF SCARRED AND NON-SCARRED MYOCARDIUM IN CARDIAC MRI USING LEARNED DICTIONARIES. IEEE signal processing society; 2011-09-11 - 2011-09-14.
  • Nordseth, Trond; Edelson, Dana P.; Bergum, Daniel; Olasveengen, Theresa Mariero; Eftestøl, Trygve; Abella, Benjamin; Skogvoll, Eirik (2011). Optimal CPR Loop Duration for Asystole and Pulseless Electrical Activity During In-Hospital Cardiac Arrest.
  • Nordseth, Trond; Edelson, DP; Bergum, Daniel; Olasveengen, Theresa Mariero; Eftestøl, Trygve; Abella, Ben; Skogvoll, Eirik (2011). Optimal CPR Loop Duration for Asystole and PEA during In-Hospital Cardiac Arrest. American Heart Association; 2011-11-12 - 2011-11-13.
  • Nordseth, Trond; Edelson, DP; Bergum, Daniel; Olasveengen, Theresa Mariero; Eftestøl, Trygve; Abella, Ben; Skogvoll, Eirik (2011). Prevalence and Development of Clinical States during In-Hospital Cardiac Arrest. American Heart Association; 2011-11-12 - 2011-11-13.
  • Engan, Kjersti; Eftestøl, Trygve; Ørn, Stein; Kvaløy, Jan Terje; Woie, Leik (2010). Exploratory Data Analysis of Image Texture and Statistical Features on Myocardium and Infarction Areas in Cardiac Magnetic Resonance Images. 2010-08-31 - 2010-09-04.
  • Kvaløy, Jan Terje; Skogvoll, Eirik; Eftestøl, Trygve; Gundersen, Kenneth; Kramer-Johansen, Jo; Olasveengen, Theresa Mariero; Steen, Petter Andreas (2010). Analysing clinical state transitions during cardiopulmonary resuscitation. 2010-08-29 - 2010-09-02.
  • Pampanin, D.M.; Ravagnan, E.; Apeland, S.; Aarab, N.; Godal, B.F.; Westerlund, S.; Hjermann, Dag Øystein; Eftestøl, Trygve; Budka, M.; Gabrys, B.; Viarengo, A.; Barsiene, J. (2010). The marine environment IQ concept Developing an index of the quality of the marine environment based on biomarkers: Integration of pollutant effects on marine organisms.
  • Eftestøl, Trygve (2009). Controlling true positive rate in ROC analysis. 2009-09-13 - 2009-09-16.
  • Kjosmoen, Thomas; Ryen, Tom; Eftestøl, Trygve (2009). Exploring the combinatorics of motif alignments for accurately computing E-values from p-values. 2009-04-28 - 2009-04-30.
  • Thorsen, Kari Anne Haaland; Eftestøl, Trygve; Rong, Chunming; Steen, Petter Andreas (2009). An Integrated Information Sharing Structure for Resuscitation Data. 2009-05-26 - 2009-05-29.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Kramer-Johansen, Jo; Eftestøl, Trygve (2008). Using ECG-analysis to quantify the effect of increasing pre-shock pauses in chest compressions on the probability of ROSC.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Kramer-Johansen, Jo; Olasveengen, Theresa Mariero; Eftestøl, Trygve (2008). The effect of using within-patient correlation to improve shock outcome prediction.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Kramer-Johansen, Jo; Olasveengen, Theresa Mariero; Eilevstjønn, Joar; Eftestøl, Trygve (2008). The effect of using within-patient correlation to improve shock outcome prediction. 2008-05-22 - 2008-05-24.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Kramer-Johansen, Jo; Steen, Petter Andreas; Eftestøl, Trygve (2008). Using ECG-analysis to quantify the effect of increasing pre-shock pauses in chest compressions on the probability of ROSC. 2008-05-22 - 2008-05-24.
  • Kvaløy, Jan Terje; Skogvoll, Eirik; Eftestøl, Trygve; Gundersen, Kenneth; Kramer-Johansen, Jo; Olasveengen, Theresa Mariero; Steen, Petter Andreas (2008). Identifying factors influencing clinical state transitions in cardiac arrest resuscitation.
  • Woie, L.; Eftestøl, Trygve; Kvaløy, Jan Terje; Aarsland, Torbjørn; Tjelta, K.; Nilsen, DWT (2008). Intracardiac electrocardiographic (EGM) morphology changes in patients with implantable cardioverter defibrillator (ICD). 2008-05-18 - 2008-05-21.
  • Woie, L.; Eftestøl, Trygve; Kvaløy, Terje Jan; Aarsland, Torbjørn; Tjelta, K.; Nilsen, DWT (2008). Intracardiac electrocardiographic (EGM) morphology changes in patients with implantable cardioverter defibrillator (ICD).
  • Eftestøl, Trygve (2008). Signal processing and analysis of data from therapy of cardiac arrest patients. Simula Research Laboratory, Center for Biomedical Computing; 2008-12-10.
  • Johansen, Øystein; Ryen, Tom; Eftestøl, Trygve; Kjosmoen, Thomas; Ruoff, Peter (2008). Splice Site Prediction using Artificial Neural Networks. 2008-10-03 - 2008-10-04.
  • Olasveengen, Theresa Mariero; Eftestøl, Trygve; Gundersen, Kenneth; Steen, Petter Andreas; Wik, Lars; Sunde, Kjetil (2008). Ventricular fibrillation characteristics are different in patients with coronary heart disease compared to patients with a primary arrhythmia.
  • Eftestøl, Trygve (2007). A research experience in bioengineering in Norway. 2007-07-05 - 2007-07-06.
  • Eftestøl, Trygve (2007). Signal processing and pattern recognition in resuscitation science. 2007-07-05 - 2007-07-06.
  • Eftestøl, Trygve; Skogvoll, Eirik; Gundersen, Kenneth; Kvaløy, Jan Terje; Kramer-Johansen, Jo; Steen, Petter Andreas (2006). Information structuring and symbolic representation for analysis of resuscitation data. 2006-06-07 - 2006-06-09.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Eftestøl, Trygve; Steen, Petter Andreas; Kramer-Johansen, Jo; Wik, Lars; Sterz, Fritz; Losert, Heidrun; Aase, Sven Ole (2006). Improved shock outcome prediction from a random model.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Eftestøl, Trygve; Steen, Petter Andreas; Kramer-Johansen, Jo; Wik, Lars; Sterz, Fritz; Losert, Heidrun; Aase, Sven Ole (2006). Random effects in shock outcome prediction. 2006-05-10 - 2006-05-13.
  • Gundersen, Kenneth; Kvaløy, Jan Terje; Eftestøl, Trygve; Steen, Petter Andreas; Kramer-Johansen, Jo; Wik, Lars; Sterz, Fritz; Losert, Heidrun; Aase, Sven Ole (2006). Random effects in shock outcome prediction.
  • Kvaløy, Jan Terje; Eftestøl, Trygve; Gundersen, Kenneth; Skogvoll, Eirik; Kramer-Johansen, Jo; Steen, Petter Andreas (2006). Analysis of factors influencing clinical state transitions in cardiac arrest.
  • Skogvoll, Eirik; Eftestøl, Trygve; Gundersen, Kenneth; Kvaløy, Jan Terje; Kramer-Johansen, Jo; Steen, Petter Andreas (2006). The dynamics of cardiac arrest - clinical state transitions during CPR. 2006-05-10 - 2006-05-13.
  • Dragsund, Inge; Gundersen, Kenneth; Risdal, Martin; Kramer-Johansen, Jo; Abella, Ben; edelson, dana; Sterz, Fritz; Eftestøl, Trygve (2006). Analysing the dynamics of pulseless electrical activity during cardiopulmonary resuscitation. 2006-09-17 - 2006-09-20.
  • Eftestøl, Trygve (2006). Matematikk på liv og død?. 2006-11-29.
  • Eftestøl, Trygve (2006). Waveform analysis - the way to improve survival?. 2006-05-10 - 2006-05-13.
  • Eftestøl, Trygve; Ryen, Tom; Aase, Sven Ole; Strässle, Cassian; Boos, Marcus; Schuster, Guido M.; Ruoff, Peter (2006). Eukaryotic gene prediction by spectral analysis and pattern recognition techniques. 2006-06-07 - 2006-06-09.
  • Neurauter, Andreas; Eftestøl, Trygve; Kramer-Johansen, Jo; Wenzel, Volker; Lindner, Karl; Eilevstjønn, Joar; Myklebust, Helge; Steen, Petter Andreas; Strohmenger, Hans Ulrich (2006). Prediction of countershock success employing single feature analysis from ventricular fibrillation power bands or feature combination using neural networks.
  • Risdal, Martin; Losert, Heidrun; Sterz, Fritz; Aase, Sven Ole; Eftestøl, Trygve (2006). Using thoracic impedance for identification of return of spontaneous circulation during resuscitation. 2006-06-07 - 2006-06-09.
  • Risdal, Martin; Steen, Petter Andreas; Kramer-Johansen, Jo; Wik, Lars; Sterz, Fritz; Losert, Heidrun; Aase, Sven Ole; Eftestøl, Trygve (2006). Discriminating between PEA and pulse circulating rhythm using ECG.
  • Eftestøl, Trygve (2005). Signalbehandling og mønstergjenkjenning innen akuttmedisin. 2005-09-22.
  • Eftestøl, Trygve; Risdal, Martin; Eilevstjønn, Joar; Steen, Petter Andreas (2005). Advanced life support therapy on out-of-hospital cardiac arrest patients: Applying signal processing and pattern recognition methods.
  • Risdal, Martin; Aase, Sven Ole; Eftestøl, Trygve (2005). Arbitrary feature space dimensionality reduction with focus on loss of discrimination for two-class problems. 2005-09-22 - 2005-09-24.
  • Risdal, Martin; Aase, Sven Ole; Eftestøl, Trygve (2005). Examining the Potential of Using Thorax Impedance Measured by Automated External Defibrillators for Quantification of Circulation. 2005-09-25 - 2005-09-28.
  • Risdal, Martin; Eftestøl, Trygve; Aase, Sven Ole; Steen, Petter Andreas; Sleveland, Tone; Wik, Lars; Kramer-Johansen, Jo; Sterz, Fritz; Losert, Heidrun (2005). Improving rhythm classification using electrocardiogram and thorax impedance recorded by automated external defibrillators. 2005-09-22 - 2005-09-24.
  • Risdal, Martin; Losert, Heidrun; Nysæther, Jon; Aase, Sven Ole; Sterz, Fritz; Eftestøl, Trygve (2005). NON-INVASIVE VENTILATION MONITORING DURING CARDIOPULMONARY RESUSCITATION BY MEANS OF THORACIC IMPEDANCE. 2005-11-20 - 2005-11-25.
  • Risdal, Martin; Losert, Heidrun; Nysæther, Jon; Aase, Sven Ole; Sterz, Fritz; Eftestøl, Trygve (2005). VENTILATION CLASSIFICATION FOR CARDIOPULMONARY RESUSCITATION QUALITY MONITORING USING THORACIC IMPEDANCE. 2005-11-20 - 2005-11-25.
  • Risdal, Martin; Stavland, Mette; Aase, Sven Ole; Eftestøl, Trygve (2005). IMPEDANCE-BASED VENTILATION DETECTION DURING CARDIOPULMONARY RESUSCITATION USING A NEURAL NETWORK. 2005-11-20 - 2005-11-25.
  • Eftestøl, Trygve; Wik, Lars; Sunde, Kjetil; Steen, Petter Andreas (2004). CPR causes changes in predictors of VF defibrillation success during out-of-hospital cardiac arrest. 2004-09-08 - 2004-09-11.
  • Eilevstjønn, Joar; Eftestøl, Trygve; Kramer-Johansen, Jo; Steen, Petter Andreas (2004). Reducing the no flow time in automated external defibrillation. 2004-09-08 - 2004-09-11.
  • Watson, Jamie; Uchaipichat, Nopadol; Addison, Paul S; Clegg, Gareth R; Robertson, Colin; Eftestøl, Trygve; Steen, Petter Andreas (2004). Novel wavelet transform methods predict defibrillation success for out-of-hospital cardiac arrest. 2004-09-08 - 2004-09-11.
  • Eftestøl, Trygve (2003). Ingeniøren, kan de hjelpe oss? Engineers - can they help us?. 2003-09-04 - 2003-09-06.
  • Eilevstjønn, Joar; Eftestøl, Trygve; Steen, Petter Andreas (2003). Reducing The Hands-Off Interval By Filtering CPR Artefacts In ECG. 2003-09-04 - 2003-09-06.
  • Addison, Paul S; Uchaipichat, Nopadol; Watson, Jamie; Clegg, Gareth R; Robertson, Colin; Steen, Petter Andreas; Eftestøl, Trygve (2002). Positional Depedence of Time-Frequency Information in the Electrocardiograph used for the Prediction of Successful Defibrillation. 2002-12-04 - 2002-12-08.
  • Eftestøl, Trygve; Sunde, Kjetil; Steen, Petter Andreas (2002). The effects of interrupting precordial compressions on the calculated probability of defibrillation success in out-of-hospital cardiac arrest patients. 2002-10-02 - 2002-10-05.
  • Eilevstjønn, Joar; Husøy, John Håkon; Eftestøl, Trygve; Aase, Sven Ole; Steen, Petter Andreas (2002). Multichannel adaptive filtering using an efficient matching pursuit-like algorithm for removal of CPR artifacts in ECG signals. 2002-05-13 - 2002-05-17.
  • Uchaipichat, Nopadol; Addison, Paul S; Watson, Jamie; Clegg, Gareth R; Robertson, Colin; Steen, Petter Andreas; Eftestøl, Trygve (2002). Wavelet Power Spectrum Analysis of Cardiac Arrhythmias: Ventricular Fibrillation. 2002-11-22 - 2002-11-23.
  • Uchaipichat, Nopadol; Watson, Jamie; Addison, Paul S; Clegg, Gareth R; Robertson, Colin; Steen, Petter Andreas; Eftestøl, Trygve (2002). Optimal pre-shock signal length for time-frequency classification used in the predicition of successful defibrillation. 2002-12-04 - 2002-12-07.
  • Addison, Paul S; Uchaipichat, Nopadol; Watson, Jamie; Clegg, Gareth R; Robertson, Colin; Steen, Petter Andreas; Eftestøl, Trygve (2001). Wavelet power spectrum-based prediction of successful defibrillation from ventricular fibrillation. 2001-10-25 - 2001-10-28.
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