Research Topics
| Jo Kramer-JohansenSummaryAffiliation: University of Oslo Country: Norway Publications
| Collaborators
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Detail Information
Publications
Development of the probability of return of spontaneous circulation in intervals without chest compressions during out-of-hospital cardiac arrest: an observational studyKenneth Gundersen
Department of Electrical and Computing Engineering, University of Stavanger, Stavanger, Norway
BMC Med 7:6. 2009..We have used this in the current study to quantify in detail the effects of interrupting chest compressions...
Mechanical chest compressions with trapezoidal waveform improve haemodynamics during cardiac arrestJo Kramer-Johansen
Institute for Experimental Medical Research, Oslo University Hospital, Oslo, Norway
Resuscitation 82:213-8. 2011..We studied the haemodynamic differences of such waveforms in a porcine model of cardiac arrest...
Detection of carbon dioxide in expired air after oesophageal intubation; the role of bystander mouth-to-mouth ventilationJ Kramer-Johansen
Institute for Experimental Medical Research and Pre Hospital Division, Ulleval University Hospital, Oslo, Norway
Acta Anaesthesiol Scand 52:155-7. 2008..Both patients had received bystander cardiopulmonary resuscitation with mouth-to-mouth ventilation, and the CO2 from the rescuers' expired air was trapped and subsequently detected after oesophageal intubation...- Transthoracic impedance changes as a tool to detect malpositioned tracheal tubesJo Kramer-Johansen
Institute for Experimental Medical Research, Ulleval University Hospital, N 0407 Oslo, Norway
Resuscitation 76:11-6. 2008..We wanted to test the ability of impedance changes as measured across the chest via the standard defibrillation pads to distinguish between oesophageal and tracheal ventilations in non-circulated patients... - Advanced cardiac life support before and after tracheal intubation--direct measurements of qualityJo Kramer-Johansen
Institute for Experimental Medical Research, University of Oslo, Ulleval University Hospital, N 0407 Oslo, Norway
Resuscitation 68:61-9. 2006..Tracheal intubation should improve the quality of cardiopulmonary resuscitation (CPR) by enabling adequate ventilation without pauses in external chest compressions... - Uniform reporting of measured quality of cardiopulmonary resuscitation (CPR)Jo Kramer-Johansen
Institute for Experimental Medical Research, Ullevaal University Hospital, N 0407 Oslo, Norway
Resuscitation 74:406-17. 2007..The recommendations are discussed in light of the different purposes outlined above... - Pauses in chest compression and inappropriate shocks: a comparison of manual and semi-automatic defibrillation attemptsJo Kramer-Johansen
Institute for Experimental Medical Research, Ullevaal University Hospital, N 0407 Oslo, Norway
Resuscitation 73:212-20. 2007..We hypothesised that pauses are shorter for manual defibrillation by trained rescuers, but with an increased number of inappropriate shocks given for a non-VF/VT rhythm... - Quality of out-of-hospital cardiopulmonary resuscitation with real time automated feedback: a prospective interventional studyJo Kramer-Johansen
Institute for Experimental Medical Research, University of Oslo, N 0407 Oslo, Norway
Resuscitation 71:283-92. 2006..To compare quality of CPR during out-of-hospital cardiac arrest with and without automated feedback... - Quality of cardiopulmonary resuscitation during out-of-hospital cardiac arrestLars Wik
National Competence Center for Emergency Medicine, Ulleval University Hospital, Oslo, Norway
JAMA 293:299-304. 2005..Electrocardiographic analysis and defibrillation accounted for only small parts of intervals without chest compressions... - A failed attempt to improve quality of out-of-hospital CPR through performance evaluationTheresa Mariero Olasveengen
Institute for Experimental Medical Research, Ulleval University Hospital, Oslo, Norway
Prehosp Emerg Care 11:427-33. 2007..Our hypothesis was that providing CPR performance evaluation (CPR-PE) to three ambulance services would facilitate local education and implementation of CPR guidelines and, consequently, improve CPR quality... - Arterial blood gases during basic life support of human cardiac arrest victimsMorten Pytte
Institute for Experimental Medical Research and Department of Anaesthesiology, Ulleval University Hospital, Kirkeveien 166, N 0407 Oslo, Norway
Resuscitation 77:35-8. 2008..Ventilation with tidal volumes sufficient to raise the victim's chest is an integral part of guidelines for lay-rescuer basic life support, but optimal tidal volume, frequency and ratio to chest compressions are not known... - Haemodynamic effects of adrenaline (epinephrine) depend on chest compression quality during cardiopulmonary resuscitation in pigsMorten Pytte
Department of Anaesthesiology, Ulleval University Hospital, Oslo, Norway
Resuscitation 71:369-78. 2006..We have studied the haemodynamic effects of adrenaline during CPR with good laboratory quality and with quality simulating clinical findings and the feasibility of monitoring these effects through VF waveform analysis... - A randomized trial of the capability of elderly lay persons to perform chest compression only CPR versus standard 30:2 CPRAndres Neset
Institute for Experimental Medical Research, Oslo University Hospital Ulleval, Kirkeveien 166, Oslo, Norway
Resuscitation 81:887-92. 2010..We wanted to study if elderly lay persons could perform 10min of CPR on a realistic manikin with continuous chest compressions (CCC) and conventional CPR (30:2)... - Prearrest administration of low-molecular-weight heparin in porcine cardiac arrest: hemodynamic effects and resuscitabilityMorten Pytte
Institute for Experimental Medical Research and Department of Anesthesiology, Ulleval University Hospital, Oslo, Norway
Crit Care Med 36:881-6. 2008..We studied the hemodynamic effects of prearrest anticoagulation with a low-molecular-weight heparin suitable for clinical use during cardiopulmonary resuscitation in pigs... - Is CPR quality improving? A retrospective study of out-of-hospital cardiac arrestTheresa M Olasveengen
Institute for Experimental Medical Research, Ulleval University Hospital, University of Oslo, N 0407 Oslo, Norway
Resuscitation 75:260-6. 2007..To evaluate the quality of cardiopulmonary resuscitation (CPR) performed by a physician-manned ambulance, and assess whether it changed with time influenced by developing scientific evidence and guideline changes... - Chest compressions by ambulance personnel on chests with variable stiffness: abilities and attitudesSilje Ødegaard
University of Oslo, Faculty Division Ulleval University Hospital, N 0407 Oslo, Norway
Resuscitation 74:127-34. 2007..Quality of cardiopulmonary resuscitation (CPR) performed by professionals is reported to be substandard even with automated corrective feedback. We hypothesised that lack of quality is not due to physical capabilities... - The effect of transport on quality of cardiopulmonary resuscitation in out-of-hospital cardiac arrestSilje Ødegaard
Institute for Experimental Medical Research, Ulleval University Hospital, N 0407 Oslo, Norway
Resuscitation 80:843-8. 2009.... - Improving cardiopulmonary resuscitation quality to ensure survivalPetter Andreas Steen
University of Oslo, University Division UUS and Division of Prehospital Services, Norway
Curr Opin Crit Care 14:299-304. 2008..The effects of cardiopulmonary resuscitation quality factors on patient survival are presently under scrutiny... - Time used for ventilation in two-rescuer CPR with a bag-valve-mask device during out-of-hospital cardiac arrestSilje Odegaard
Institute for Experimental Medical Research, Ulleval University Hospital, N 0407 Oslo, Norway
Resuscitation 77:57-62. 2008.... - Shock outcome is related to prior rhythm and duration of ventricular fibrillationJoar Eilevstjønn
Laerdal Medical AS, P O Box 377, N 4002 Stavanger, Norway
Resuscitation 75:60-7. 2007..We also analysed how these factors relate to the VF analysis feature median slope... - Prediction of countershock success using single features from multiple ventricular fibrillation frequency bands and feature combinations using neural networksAndreas Neurauter
Department of Anaesthesiology and Critical Care Medicine, Innsbruck Medical University, Innsbruck, Austria
Resuscitation 73:253-63. 2007..This may indicate that various simple VF features, such as median slope already reach the maximum prediction power extractable from VF ECG... - Using within-patient correlation to improve the accuracy of shock outcome prediction for cardiac arrestKenneth Gundersen
Department of Electrical and Computing Engineering, University of Stavanger, Stavanger, Norway
Resuscitation 78:46-51. 2008..The accuracy of such methods determines how useful it is clinically and for retrospective analysis... - Predicting survival with good neurologic recovery at hospital admission after successful resuscitation of out-of-hospital cardiac arrest: the OHCA scoreKjetil Sunde
Eur Heart J 28:773; author reply 773-4. 2007 - Dynamics and state transitions during resuscitation in out-of-hospital cardiac arrestEirik Skogvoll
Unit for Applied Clinical Research, Faculty of Medicine, Norwegian University of Science and Technology NTNU, Norway
Resuscitation 78:30-7. 2008..g. PEA-->ASY) or by intervention (e.g. VF-->ASY after DC shock); temporary ROSC may also occur. To gain insight into the dynamics of this process, we analyzed the state transitions over time using real-life data... - Reducing no flow times during automated external defibrillationJoar Eilevstjønn
Laerdal Medical AS, P O Box 377, N 4002 Stavanger, Norway
Resuscitation 67:95-101. 2005..By introducing the proposed methods into an AED, the NFT would be significantly reduced, hopefully increasing the survival... - Estimation of the duration of ventricular fibrillation using ECG single feature analysisAndreas Neurauter
Department of Anaesthesiology and Critical Care Medicine, Innsbruck Medical University, Anichstrasse 35, 6020 Innsbruck, Austria
Resuscitation 73:246-52. 2007..No significant correlation (p<.05) between any of the VF ECG features and downtime could be found. The duration of cardiac arrest could not be estimated reliably from human VF ECG single feature analysis... - Effects of compression depth and pre-shock pauses predict defibrillation failure during cardiac arrestDana P Edelson
Section of General Internal Medicine, University of Chicago Hospitals, Chicago, IL 60637, United States
Resuscitation 71:137-45. 2006..Strategies to correct these deficiencies should be developed and consideration should be made to replacing current-generation automated external defibrillators that require long pre-shock pauses for rhythm analysis... - A method to remove CPR artefacts from human ECG using only the recorded ECGSofia Ruiz de Gauna
Department of Electronics and Telecommunications, University of the Basque Country, Alameda de Urquijo s n, 48013 Bilbao, Spain
Resuscitation 76:271-8. 2008..To show the possibility of using cardiopulmonary resuscitation (CPR) artefact suppression methods that do not need additional reference signals to model CPR artefacts... - Identifying approaches to improve the accuracy of shock outcome prediction for out-of-hospital cardiac arrestKenneth Gundersen
Department of Electrical and Computing Engineering, University of Stavanger, Stavanger, Norway
Resuscitation 76:279-84. 2008..The accuracy of such methods determines how useful it is clinically and for retrospective analysis... - Independent evaluation of a defibrillation outcome predictor for out-of-hospital cardiac arrested patientsTrygve Eftestøl
University of Stavanger, Faculty of Science and Technology, Department of Electrical and Computer Engineering, N 4036 Stavanger, Norway
Resuscitation 67:55-61. 2005..As in the present study, future testing should be performed on totally independent data not included in the design of the outcome predictor to get a reliable impression of expected performance... - Predicting outcome after cardiac arrest: two caveatsJo Kramer-Johansen
Resuscitation 66:108-9; author reply 109-10. 2005 - Reconfirmation algorithms should be the standard of care in automated external defibrillatorsJo Kramer-Johansen
Resuscitation 70:474-5; author reply 475. 2006 - Automatic identification of return of spontaneous circulation during cardiopulmonary resuscitationMartin Risdal
Department of Electrical and Computer Engineering, University of Stavanger, Stavanger 4036, Norway
IEEE Trans Biomed Eng 55:60-8. 2008..5% of the normal pulse rhythm segments. Automatic identification of pulse could avoid unnecessary pulse checks and thereby reduce no-flow time and potentially increase the chance of survival...