Sökning: "pacemakers"

Visar resultat 1 - 5 av 19 avhandlingar innehållade ordet pacemakers.

1. 1. Electromagnetic Modeling and Design of Medical Implants and Devices

   Författare :Oskar Talcoth; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Magnetic Resonance Imaging; Implant Safety; Lead Heating; Pacemakers; Thin-wire Approximation; Convex Relaxation; Optimal Sensor Placement; Optimal Measurements; Helix; Sensor Selection; MR Safety; Magnetic Tracking; Fisher Information Matrix;

   Sammanfattning : This thesis covers two topics in biomedical electromagnetics: pacemaker lead heating in magnetic resonance imaging (MRI) and optimization of sensorpositions in magnetic tracking.The electromagnetic part of pacemaker lead heating during MRI is a resonant phenomenon which is complicated by, among other factors, the wide range of length scales involved in the problem. LÄS MER

3. 2. Electromagnetic Modeling and Sensitivity-Based Optimization of Medical Devices

   Författare :Oskar Talcoth; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; helical conductors; optimal measurements; thin-wire approximation; inverse problems; Convex optimization; pacemakers; design of experiments; MR safety; multi-scale; magnetic resonance imaging; magnetic tracking; optimal sensor placement;

   Sammanfattning : Electromagnetics is a fundamental part of biomedical engineering and modern healthcare due to the electromagnetic nature of several important processes in the human body and the interactions of electromagnetic fields with the human body. As a consequence, electromagnetics is exploited for diagnostic and therapeutic purposes by a multitude of medical devices. LÄS MER

4. 3. Health-related quality of life in patients with pacemakers. A descriptive and experimental study

   Författare :Dan Malm; Bengt Fridlund; Joep Perk; Göteborgs universitet; []
   Nyckelord :caring; elderly; gender; health-related quality of life; intervention; pacemaker population; patient education; self-care.; Health-related quality of life;

   Sammanfattning : The general aim of this thesis was to describe and evaluate the health-relatedquality of life (HRQoL) of patients with pacemakers, as well as to determine theeffects of a nurse-led intervention regarding health-related quality of life in theform of a self-care program for these patients. Descriptive designs were used todescribe (I) quality of life (n=182) as well as (II) HRQoL (n=697) of pacemakerpatients based on a nursing perspective. LÄS MER

5. 4. Computer-based modeling and simulation in the analysis of cardiac arrhythmias and cardiac pacing

   Författare :Hans Åhlfeldt; Linköpings universitet; []
   Nyckelord :arrhythmogenic mechanisms; modulated parasystole; phase response curve; pacemaker follow-up; modeling; simulation; MEDICINE; MEDICIN;

   Sammanfattning : Most systems for ECG analysis deal with QRS classification and arrhythmia detection but do not address the problem of finding the underlying mechanism responsible for the manifest arrhythmia. Although it is possible to distinguish among different arrhythmogenic mechanisms on the cellular level, it is far more difficult in the clinic based on ECG recordings. LÄS MER

7. 5. Cardiac memory studies in two human models

   Författare :Liliane Wecke; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Cardiac memory; repolarization; pacing; WPW ablation;

   Sammanfattning : Background: Cardiac memory is a form of electrical remodeling of the ventricles, where the T vector follows ("remembers') a previously altered QRS vector. On the electrocardiogram (ECG), it presents as T-wave inversions. LÄS MER