Search for dissertations about: "beat-to-beat variability"

Showing result 1 - 5 of 6 swedish dissertations containing the words beat-to-beat variability.

  2. 1. Beat-to-beat variability of QRS amplitude and heart rate in ischemic heart disease : diagnostic potentials

    Author : Inger Hagerman; Karolinska Institutet; Karolinska Institutet; []
    Keywords : autonomic blockade; beat-to-beat variability; chaos; coronary arterydisease; correlation dimension; dobutamine; ECG; electrical heterogeneity; fractal dimension; heart rate variability; Lyapunov exponent; nonlinear; QRSvariance; surrogate data;

    Abstract : The diagnostic potential of beat-to-beat QRS amplitude variability in patients with coronary artery disease (CAD) was evaluated with variance ECG and compared to exercise stress test and myocardial scintigraphy (SPECT). Two high prevalence populations of 199 and 166 patients each were investigated. READ MORE

  4. 2. Fetal reactivity assessment during intrapartum stress by analysis of the fetal ECG signal

    Author : Sofia Blad; Göteborgs universitet; []
    Keywords : FHR variability; fetal ECG; Asphyxia; Intrauterine infection; Residual method; STAN;

    Abstract : Fetal responses to the stress of labour and delivery are constituted by a combination of changes in neuronal, hormonal and organ based reactions. The aim of electronic fetal monitoring is to identify fetuses at risk of hypoxia during birth, thus enabling timely intervention to avoid an adverse outcome. READ MORE

  5. 3. Autonomic cardiac control in patients with epilepsy : spectral analysis of heart rate variability

    Author : Håkan Persson; Karolinska Institutet; Karolinska Institutet; []
    Keywords : SUDEP; autonomic nervous system; heart rate variability; epilepsy; carbamazepine; epilepsy surgery;

    Abstract : The heart is affected by the central nervous system via sympathetic and para-sympathetic efferents from autonomic centres in the brain stem. By assessing the beat to beat variation of the RR-intervals of the heart, i.e. the heart rate variability (HRV) it is possible to separately analyse sympathetic and parasympathetic effects on the heart. READ MORE

  6. 4. Autonomic cardiac control in long QT syndrome : clinical studies of arrhythmogenic triggers

    Author : Anna Lundström; Annika Rydberg; Urban Wiklund; Håkan Eliasson; Jacob Tfelt-Hansen; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Long QT syndrome; pediatrics; exercise; Holter; water immersion; arrhythmia; clinical physiology; ECG; heart rate variability; heart rate response; cardiovascular disease; hjärt- och kärlforskning; kardiologi; Cardiology; pediatrik; Pediatrics;

    Abstract : Background: Long QT syndrome (LQTS) is an inherited cardiac disease characterized by prolonged cardiac repolarization and an increased risk for life-threatening arrhythmias. These arrhythmias are typically triggered by adrenergic stimuli, such as physical activity and intense emotions, implicating that the sympathetic part of the autonomic nervous system (ANS) is involved in arrhythmogenesis. READ MORE

  7. 5. Blood pressure in atrial fibrillation

    Author : Joakim Olbers; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Introduction: Hypertension is a leading risk factor for cardiovascular morbidity and premature death. Prevalence of hypertension in the adult population in Sweden has been estimated to 27%. Atrial fibrillation (AF) is the most prevalent sustained arrhythmia of clinical relevance with an estimated prevalence of at least 2.9% among adults in Sweden. READ MORE