scholarly journals Entropy Analysis of RR and QT Interval Variability during Orthostatic and Mental Stress in Healthy Subjects

Entropy ◽  
2014 ◽  
Vol 16 (12) ◽  
pp. 6384-6393 ◽  
Author(s):  
Mathias Baumert ◽  
Barbora Czippelova ◽  
Anand Ganesan ◽  
Martin Schmidt ◽  
Sebastian Zaunseder ◽  
...  
Keyword(s):  
Qt Interval ◽  
Mental Stress ◽  
Healthy Subjects ◽  
Entropy Analysis ◽  
Qt Interval Variability

scholarly journals Heart Rate Influence on the QT Variability Risk Factors

Diagnostics ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1096
Author(s):  
Irena Andršová ◽  
Katerina Hnatkova ◽  
Martina Šišáková ◽  
Ondřej Toman ◽  
Peter Smetana ◽  
...  
Keyword(s):  
Heart Rate ◽  
Standard Deviation ◽  
Qt Interval ◽  
Healthy Subjects ◽  
Sequential Analysis ◽  
Rr Intervals ◽  
Qt Variability Index ◽  
Qt Variability ◽  
Variability Index ◽  
Qt Interval Variability

QT interval variability, mostly expressed by QT variability index (QTVi), has repeatedly been used in risk diagnostics. Physiologic correlates of QT variability expressions have been little researched especially when measured in short 10-second electrocardiograms (ECGs). This study investigated different QT variability indices, including QTVi and the standard deviation of QT interval durations (SDQT) in 657,287 10-second ECGs recorded in 523 healthy subjects (259 females). The indices were related to the underlying heart rate and to the 10-second standard deviation of RR intervals (SDRR). The analyses showed that both QTVi and SDQT (as well as other QT variability indices) were highly statistically significantly (p < 0.00001) influenced by heart rate and that QTVi showed poor intra-subject reproducibility (coefficient of variance approaching 200%). Furthermore, sequential analysis of regression variance showed that SDQT was more strongly related to the underlying heart rate than to SDRR, and that QTVi was influenced by the underlying heart rate and SDRR more strongly than by SDQT (p < 0.00001 for these comparisons of regression dependency). The study concludes that instead of QTVi, simpler expressions of QT interval variability, such as SDQT, appear preferable for future applications especially if multivariable combination with the underlying heart rate is used.

Autonomic Effects of Dipyridamole Stress Testing on Frequency Distribution of RR and QT Interval Variability

1998 ◽  
Vol 21 (11) ◽  
pp. 2401-2406 ◽  
Author(s):  
HEINZ THERES ◽  
DIETRICH ROMBERG ◽  
THOMAS LEUTHOLD ◽  
ADRIAN C. BORGES ◽  
KARL STANGL ◽  
...  
Keyword(s):  
Frequency Distribution ◽  
Qt Interval ◽  
Stress Testing ◽  
Qt Interval Variability ◽  
Dipyridamole Stress

Reduced Hemodynamic Responses to Physical and Mental Stress Under Low-Dose Rilmenidine in Healthy Subjects

2006 ◽  
Vol 20 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Renata Rodrigues Teixeira de Castro ◽  
Eduardo Tibiriçá ◽  
Marcos Aurélio Brazão de Oliveira ◽  
Paula Barbosa Baptista Moreira ◽  
Marcelo Flores Catelli ◽  
...  
Keyword(s):  
Mental Stress ◽  
Healthy Subjects ◽  
Low Dose ◽  
Hemodynamic Responses

scholarly journals Model-Based Evaluation of Exenatide Effects on the QT Interval in Healthy Subjects Following Continuous IV Infusion

2017 ◽  
Vol 57 (8) ◽  
pp. 956-965 ◽  
Author(s):  
Brenda Cirincione ◽  
Frank LaCreta ◽  
Philip Sager ◽  
Donald E. Mager
Keyword(s):  
Qt Interval ◽  
Healthy Subjects ◽  
Model Based

Aclidinium Bromide, a Long-Acting Antimuscarinic, Does Not Affect QT Interval in Healthy Subjects

2011 ◽  
Vol 51 (6) ◽  
pp. 923-932 ◽  
Author(s):  
Kenneth C. Lasseter ◽  
Jordi Aubets ◽  
Ferran Chuecos ◽  
Esther Garcia Gil
Keyword(s):  
Qt Interval ◽  
Healthy Subjects ◽  
Aclidinium Bromide ◽  
Long Acting

Beat-to-beat QT interval variability in children: normal and physiologic data

2011 ◽  
Vol 44 (3) ◽  
pp. 326-329 ◽  
Author(s):  
Hirofumi Kusuki ◽  
Marina Kuriki ◽  
Kayo Horio ◽  
Misa Hosoi ◽  
Hideaki Matsuura ◽  
...  
Keyword(s):  
Qt Interval ◽  
Qt Interval Variability ◽  
Physiologic Data
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