scholarly journals Adaptation of ventricular repolarization duration and dispersion during changes in heart rate induced by atrial stimulation

2019 ◽  
Vol 25 (3) ◽  
Author(s):  
Karl‐Jonas Axelsson ◽  
Adam Brännlund ◽  
Lennart Gransberg ◽  
Gunilla Lundahl ◽  
Farzad Vahedi ◽  
...  
Keyword(s):  
Heart Rate ◽  
Ventricular Repolarization ◽  
Atrial Stimulation

Assessment and clinical relevance of the dynamic parameters of ventricular repolarization in patients with grade I left ventricular diastolic dysfunction

2019 ◽  
Vol 97 (6) ◽  
pp. 577-580
Author(s):  
Antoinette Oliveira Blackman ◽  
José Sobral Neto ◽  
Melchior Luiz Lima ◽  
Tânia Maria Andrade Rodrigues ◽  
Otoni Moreira Gomes
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Diastolic Dysfunction ◽  
Qt Dispersion ◽  
Left Ventricular Diastolic Dysfunction ◽  
Left Ventricular ◽  
Ventricular Repolarization ◽  
Premature Ventricular Complex ◽  
Increased Risk ◽  
Ventricular Diastolic Dysfunction

Imbalance in ventricular repolarization parameters are related to increased risk of severe arrhythmia and sudden cardiac death. There is limited research regarding markers to detect patients at risk in this early stage. We aimed to assess the influence of grade I left ventricular diastolic dysfunction on repolarization parameters in asymptomatic patients. Ambulatory patients with grade I left ventricular diastolic dysfunction were studied and compared with a control group. We assessed the QT dispersion circadian variation, heart rate variability in the time and frequency domains, and dynamics of QT using a 12-lead Holter. In the diastolic dysfunction group, 8 (30%) patients had QT dispersion > 80 ms. One (3.8%) patient presented premature ventricular complex > 10/h. The comparison between the 2 groups showed that the difference between the standard deviation of normal-to-normal intervals and low frequency power in both groups was statistically significant. We therefore conclude that increased parameters of ventricular repolarization and depressed heart rate variability reflect an imbalance in autonomic responses in patients with grade I left ventricular diastolic dysfunction without cardiovascular symptoms, enabling the identification of patients that are at a higher risk for cardiovascular events.

Ventricular repolarization duration and dispersion adaptation after atropine induced rapid heart rate increase in healthy adults

2017 ◽  
Vol 50 (4) ◽  
pp. 424-432 ◽  
Author(s):  
Lennart Bergfeldt ◽  
Gunilla Lundahl ◽  
Gabriel Bergqvist ◽  
Farzad Vahedi ◽  
Lennart Gransberg
Keyword(s):  
Heart Rate ◽  
Rate Increase ◽  
Ventricular Repolarization ◽  
Healthy Adults ◽  
Heart Rate Increase ◽  
Rapid Heart Rate

scholarly journals Recovery of Heart Rate Variability and Ventricular Repolarization Indices Following Exercise

2012 ◽  
Vol 17 (4) ◽  
pp. 349-360 ◽  
Author(s):  
Marc K. Lahiri ◽  
Alexandru Chicos ◽  
Dan Bergner ◽  
Jason Ng ◽  
Smirti Banthia ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Ventricular Repolarization
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