Sökning: "pacemaker"

Visar resultat 1 - 5 av 63 avhandlingar innehållade ordet pacemaker.

  1. 1. Heart rate variability and pacemaker treatment in children with Fontan circulation

    Författare :Jenny Alenius Dahlqvist; Annika Rydberg; Urban Wiklund; Jaana Pihkala; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Congenital heart disease; Fontan circulation; heart rate variability; pacemaker; sinus node dysfunction; pediatrik; Pediatrics; kardiologi; Cardiology;

    Sammanfattning : Background: Fontan surgery is performed in children with univentricular heart defects. Arrhythmias are frequent complications, occasionally requiring pacemaker treatment. Previous data regarding indications and risk factors for pacemaker treatment in Fontan patients is limited and conflicting. LÄS MER

  3. 2. The pace of innovation : Patterns of innovation in the cardiac pacemaker industry

    Författare :Patrik Hidefjäll; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Cardiac Pacemaker; Competition; Competitive Advantage; Defibrillator; Dominant Design; Innovation; Organizational Field; Patterns of Innovation; Technical Change; Technology Cycle; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : The PhD thesis "The Pace of Innovation" addresses the questions how patterns of innovation change over time in an industry, their consequences for competition and how institutional conditions in an industry shape determinants of patterns of innovation. Patterns of innovation mainly refer to how certain regularities in the diversity, types and locus of innovation change in an industry according to a technology and industry life cycle. LÄS MER

  4. 3. Long-term outcome and exercise capacity in adults with congenital heart disease with focus on tetralogy of Fallot

    Författare :Anette Sandström; Bengt Johansson; Camilla Sandberg; Daniel Rinnström; Michael Y. Henein; Erik Thunström; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Adults congenital heart disease; tetralogy of Fallot; exercise test; exercise capacity; mortality; register; physical activity; pacemaker; implantable cardioverter defibrillator; quality of life; Medfödda hjärtfel; Fallots tetrad; arbetsprov; fysisk prestationsförmåga; mortalitet; register; fysisk aktivitet; pacemaker; implanterbar defibrillator; livskvalitet; kardiologi; Cardiology; epidemiologi; Epidemiology;

    Sammanfattning : Background: Congenital heart disease (CHD) includes a wide range of malformations, from simple lesions, e.g. ventricular septal defect, that resolve spontaneously, to severe lesions, e.g. LÄS MER

  5. 4. Investigation of electrochemical properties and performance of stimulation/sensing electrodes for pacemaker applications

    Författare :Anna Norlin; Jinshan Pan; Dieter Scharnweber; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; pacemaker electrode; interfacial property; biomaterial; electrostimulation charge transfer mechanism; electrochemical impedance spectroscopy; transient processes; plasma electrolysis anodisation; porous niobium oxide; ruthenium oxide; nano-porous carbon; iridium oxide; titanium nitride; platinum; surface roughness; porous electrode; pacing impedance; electrode polarisation; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : People suffering from certain types of arrhythmia may benefit from the implantation of a cardiac pacemaker. Pacemakers artificially stimulate the heart by applying short electrical pulses to the cardiac tissue to restore and maintain a steady heart rhythm. By adjusting the pulse delivery rate the heart is stimulated to beat at desired pace. LÄS MER

  7. 5. Development and Implementation of Cardiac Event Detectors in Digital CMOS

    Författare :Joachim Rodrigues; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signal processing; Elektronik och elektroteknik; Electronics and Electrical technology; event detection; cardiac pacemaker; sleep- transistors; low-power; ASIC; Neural Networks; Electrogram; Signalbehandling; Wavelets;

    Sammanfattning : This doctoral dissertation presents the development and digital hardware realization of cardiac event detectors. Implantable medical appliances, as the cardiac pacemaker, have progressed from a life sustaining device to a device that considerably improves life quality for all ages. LÄS MER