Sökning: "ECG"

Visar resultat 1 - 5 av 201 avhandlingar innehållade ordet ECG.

  1. 1. Traces of Repolarization Inhomogeneity in the ECG

    Författare :Milos Kesek; Anders Englund; Bertil Lindahl; Markku Mäkijärvi; Uppsala universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; Internal medicine; cardiology; repolarization; ECG; QT dispersion; nondipolar components; T-wave; principal component analysis; repolarization inhomogeneity; Invärtesmedicin; Internal medicine; Invärtesmedicin;

    Sammanfattning : Repolarization inhomogeneity is arrhythmogenic. QT dispersion (QTd) is an easily accessible ECG-variable, related to the repolarization and shown to carry prognostic information. It was originally thought to reflect repolarization inhomogeneity. Lately, arguments have been risen against this hypothesis. LÄS MER

  3. 2. Signal Characterization of Atrial Arrhythmias using the Surface ECG

    Författare :Martin Stridh; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal processing; Atrial fibrillation; Atrial arrhythmias; Frequency estimation; Time-frequency analysis; QRST cancellation; ECG;

    Sammanfattning : This doctoral thesis is comprised of five parts which deal with different signal processing problems in ECG-based characterization of atrial arrhythmias. Such characterization requires that the ventricular activity has first been cancelled in the ECG. LÄS MER

  4. 3. Cardiovascular aspects on chronic obstructive pulmonary disease : with focus on ischemic ECG abnormalities, QT prolongation and arterial stiffness

    Författare :Ulf Nilsson; Anne Lindberg; Anders Blomberg; Bengt Johansson; Christine Brulin; Per Bakke; Umeå universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Epidemiology; COPD; ischemic heart disease; cardiovascular disease; ECG; spirometry; kardiologi; Cardiology;

    Sammanfattning : Background: Chronic Obstructive Pulmonary disease (COPD) is an under-diagnosed disease with a prevalence of approximately 10%, highly dependent on age and smoking habits. Comorbidities are common in COPD and of these, cardiovascular diseases (CVD) are the most common. LÄS MER

  5. 4. Novel Approaches to ECG-Based Modeling and Characterization of Atrial Fibrillation

    Författare :Frida Sandberg; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HMM; ECG; Biomedical Signal Processing; Time-Frequency Analysis; Atrial Fibrillation; Sample Entropy; AV modeling;

    Sammanfattning : This thesis deals with signal processing algorithms for analysis of the electrocardiogram (ECG) during atrial fibrillation (AF). Such analysis can be used for diagnosing patients, and for monitoring and predicting their response to various treatment. LÄS MER

  7. 5. Myocardial Perfusion and Function: Comparative assessment by ECG, SPECT and MRI

    Författare :Eva Persson; Lund Klinisk fysiologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; tomografi; medicinsk instrumentering; Physiology; radiologi; radiology; tomography; medical instrumentation; Klinisk fysiologi; Clinical physics; ST-segment deviation ; myocardial ischemia ; myocardial perfusion ; MRI; CMR; MPS; ECG; SPECT; Fysiologi; Cardiovascular system; myocardial function ; Kardiovaskulära systemet;

    Sammanfattning : Evaluation of myocardial perfusion and function is important in management of patients with suspected or known coronary artery disease. This thesis focuses on the use of common diagnostic methods, myocardial perfusion single-photon emission computed tomography (MPS) and electrocardiography (ECG), to enhance and validate the diagnostic information. LÄS MER