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Pettersen, Fred Johan; Martinsen, Ørjan Grøttem; Høgetveit, Jan Olav; Flattum, M.; Kalvøy, Håvard & Odland, Hans Henrik
(2016).
Using pacemaker leads for bioimpedance and electromyography.
Proceedings of the 16th International Conference on Electrical Bioimpedance.
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Strand-Amundsen, Runar James; Tronstad, Christian; Martinsen, Ørjan Grøttem; Høgetveit, Jan Olav; Ruud, TE & Tønnessen, Tor Inge
(2016).
Bioimpedance - in vivo vs in vitro ischemic small intestine.
Proceedings of the 16th International Conference on Electrical Bioimpedance.
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Tronstad, Christian; Elvebakk, Ole; Martinsen, Ørjan Grøttem; Kalvøy, Håvard & Høgetveit, Jan Olav
(2016).
Bioimpedance for prediction of hypoglycemic trends.
Proceedings of the 16th International Conference on Electrical Bioimpedance.
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Elvebakk, Ole; Tronstad, Christian; Gulseth, Hanne Løvdal; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Høgetveit, Jan Olav
[Show all 8 contributors for this article]
(2015).
Physiological and symptomatic responses to hypoglycemia in patients with impaired awareness.
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Pettersen, Fred Johan; Martinsen, Tormod; Høgetveit, Jan Olav & Martinsen, Ørjan Grøttem
(2015).
Unintentional heating at implants when using electrosurgery.
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Elvebakk, Ole; Tronstad, Christian; Høgetveit, Jan Olav; Jenssen, Trond Geir; Bjørgaas, Marit & Martinsen, Ørjan Grøttem
(2013).
Sweating reactions due to hypoglycemia detected by skin AC conductance.
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Tronstad, Christian; Elvebakk, Ole; Høgetveit, Jan Olav; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Martinsen, Ørjan Grøttem
(2013).
Monitoring of sweat activity for detection of severe hypoglycemia – A pilot study.
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Imenes, Kristin; Aasmundtveit, Knut E.; Husa, Ellen Marie; Høgetveit, Jan Olav; Halvorsen, Steinar & Elle, Ole Jakob
[Show all 8 contributors for this article]
(2007).
Packaging of an implantable accelerometer for measurements of heart motion.
In EMPC, , (Eds.),
Proceedings EMPC 2007 : the 16th European Microelectronics and Packaging Conference & Exhibition, June 17-20, 2007.
International Microelectronics and Packaging Society (IMAPS).
ISSN 9781622764662.
p. 697–702.
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Imenes, Kristin; Aasmundtveit, Knut E.; Husa, Ellen Marie; Høgetveit, Jan Olav; Halvorsen, Steinar & Elle, Ole Jakob
[Show all 8 contributors for this article]
(2007).
Packaging of an implantable accelerometer for measurements of heart motion.
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Høgetveit, Jan Olav; Øyri, Karl; Balasingham, Ilangko & Sveen, Ola Halvor
(2003).
Implications ofUsing Invasive Wireless Blood Preesure-Sensors in a Clinical Environment.
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Aasen, Ansgar Oddne; Næss, Leif; Høgetveit, Jan Olav & Sveen, Ola Halvor
(2002).
Ewicum, a Unique ICU Monitoring System for Early Warning and Decision Support.
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Elle, Ole Jakob; Samset, Eigil; Bakken, Andre; Høgetveit, Jan Olav & Fosse, Erik
(2000).
Head-tracking in scopic surgical procedures using Robot-held camera and head-mounted stereoscopic display.
Show summary
Sammendrag
Compared to open surgery, endoscopic surgery is associated with less patient trauma, less risk for infections and reduced overall cost related convalescence time of the patient. However, the introduction of endoscopic surgery has some disadvantages compared to open surgery. The loss of depth perception using 2D-videoscopes makes the endoscopic skill and experience of the surgeon very important. This drawback has led to the development of 3D-videoscopes, cameras and Head Mounted Displays (HMD). HMD¿s helps the surgeon to be immersed by the video images. It has been observed that many surgeons, using head-mounted displays on 3D-vision system, turn their head in an awkward position during the procedure possibly to change the sight of view. Development of motion sickness while using the head mounted displays has also been reported. Intuitively the view changes according to the movement of the head and body. When this does not happen, the brain might misinterpret this contradictory information. In this study a prototype of a Head-Tracker is developed to overcome these problems related to the use of head mounted displays in scopic surgery. The proposed system tracks the head movements of the surgeons and direct the resulting signals from these sensed movements to a robot that holds the camera. Thus, the camera movement is coupled to the head movement, which gives the expected change of view.
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Høgetveit, Jan Olav; Sveen, Ola Halvor & Aasen, Ansgar Oddne
(1998).
EWICUM - Early Warning Intensive Care Unit Monitoring System.
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Sveen, Ola Halvor; Høgetveit, Jan Olav & Aasen, Ansgar Oddne
(1997).
EWICUM - Early Warning Intensive Care Unit Monitoring.
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Sveen, Ola Halvor; Høgetveit, Jan Olav & Aasen, Ansgar Oddne
(1997).
The EWICUM Data Presentation System.
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Sveen, Ola Halvor; Høgetveit, Jan Olav & Aasen, Ansgar Oddne
(1997).
EWICUM, Early Warning Intensive Care Unit Monitoring System.
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Aasen, Ansgar Oddne; Solberg, Rigmor; Høgetveit, Jan Olav & Sveen, Ola Halvor
(1997).
Protease cascades in intraabdominal infection.
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Sveen, Ola Halvor; Høgetveit, Jan Olav & Aasen, Ansgar Oddne
(1997).
EWICUM, an Early Warning Monitorng System for Data Presentation in the ICU.
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Sveen, Ola Halvor; Høgetveit, Jan Olav & Aasen, Ansgar Oddne
(1996).
An intensive care unit data presentation system for critical biochemical variables and scoring systems.
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Aasen, Ansgar Oddne; Sveen, Ola Halvor & Høgetveit, Jan Olav
(1996).
Data Presentation in the Surgical Intensive Care Unit. Development of a Data Presentation System for Critical Biochemical Variables and Scoring Systems.
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Mirtaheri, Peyman; Gunnlaugsdottir, Helga; Høgetveit, Jan Olav & Hellström, Lars-Gösta
(2013).
Spectroscopic determination of pH in an arterial line from a Heart-lung machine.
KTH, School of Technology and Health (STH.
Show summary
There is a need for a real-time, non-invasive method to monitor blood pH in a patient lineduring cardiopulmonary bypass, as today’s methods are both invasive and time consuming.Blood pH is an indicator of physiological and biochemical activity in the body and needs to be kept within a relatively narrow range, typically between 7.35-7.45. A pH value outside thisrange can be critical for the patient and therefore needs to be carefully monitored throughoutthe course of cardiopulmonary bypass. In this study the feasibility of using spectroscopicmethods for indirect measurement of pH was investigated, and both transmission andreflectance spectroscopy were tested. The results showed that NIR reflectance spectroscopy isa feasible technique for blood pH monitoring during cardiopulmonary bypass. A strongcorrelation was found between measured pH values and spectral output in the wavelengthrange 800-930 nm. It was suggested that by means of the statistical partial least squareregression method, a model could be created with three regression factors with across-validated R^2 of 0.906 and a prediction error RMSEP of 0.089 pH units. The results presented here form a foundation for further analysis and experiments with larger sample setand more controlled experimental environment.
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Mirtaheri, Peyman & Høgetveit, Jan Olav
(2012).
Noninvasiv pH-måling ved bruk av hjertelungemaskin.
7Letras.
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Høgetveit, Jan Olav
(2008).
Information Technology Applications for Medical Devices Related to Surgical Operations.
Universitetet i Oslo.
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Høgetveit, Jan Olav
(1997).
En datapresentasjonsform spesialtilpasset intensivmedisinen.
Universitetet i Oslo.
Show summary
I intensivbehandling av alvorlig syke pasienter står legene ovenfor store mengder tilgjengelige data for hver pasient. Datapresentesjonssystemet som ble utviklet i hovedoppgaven, samler inn data automatisk fra perifere enheter, lagrer og bearbeider de innsamlede data for å gjøre materialet oversiktelig og enkelt tilgjengelig for brukerne. Formålet er å kunne gjøre tilgjengelig personell på intensivavdelingen oppmerksomme på en uheldig utvikling så tidlig som mulig slik at riktig behandling kan settes iverk på et tidlig stadium i sykdomsforløpet.