scholarly journals Entropy Measures in Analysis of Head up Tilt Test Outcome for Diagnosing Vasovagal Syncope

Entropy ◽  
2018 ◽  
Vol 20 (12) ◽  
pp. 976 ◽  
Author(s):  
Katarzyna Buszko ◽  
Agnieszka Piątkowska ◽  
Edward Koźluk ◽  
Tomasz Fabiszak ◽  
Grzegorz Opolski
Keyword(s):  
Supine Position ◽  
Vasovagal Syncope ◽  
Conditional Entropy ◽  
Sample Entropy ◽  
Permutation Entropy ◽  
Tilt Test ◽  
Entropy Measures ◽  
Head Up Tilt ◽  
Head Up Tilt Test ◽  
Passive Phase

The paper presents possible applications of entropy measures in analysis of biosignals recorded during head up tilt testing (HUTT) in patients with suspected vasovagal syndrome. The study group comprised 80 patients who developed syncope during HUTT (57 in the passive phase of the test (HUTT(+) group) and 23 who had negative result of passive phase and developed syncope after provocation with nitroglycerine (HUTT(−) group)). The paper focuses on assessment of monitored signals’ complexity (heart rate expressed as R-R intervals (RRI), blood pressure (sBP, dBP) and stroke volume (SV)) using various types of entropy measures (Sample Entropy (SE), Fuzzy Entropy (FE), Shannon Entropy (Sh), Conditional Entropy (CE), Permutation Entropy (PE)). Assessment of the complexity of signals in supine position indicated presence of significant differences between HUTT(+) versus HUTT(−) patients only for Conditional Entropy (CE(RRI)). Values of CE(RRI) higher than 0.7 indicate likelihood of a positive result of HUTT already at the passive phase. During tilting, in the pre-syncope phase, significant differences were found for: (SE(sBP), SE(dBP), FE(RRI), FE(sBP), FE(dBP), FE(SV), Sh(sBP), Sh(SV), CE(sBP), CE(dBP)). HUTT(+) patients demonstrated significant changes in signals’ complexity more frequently than HUTT(−) patients. When comparing entropy measurements done in the supine position with those during tilting, SV assessed in HUTT(+) patients was the only parameter for which all tested measures of entropy (SE(SV), FE(SV), Sh(SV), CE(SV), PE(SV)) showed significant differences.

Enhanced plasma catecholamine and cAMP response during the head-up tilt test in patients with vasovagal syncope

2005 ◽  
Vol 117 (9-10) ◽  
pp. 353-358 ◽  
Author(s):  
Peter Mitro ◽  
Emilia Rybárová ◽  
Eva Žemberová ◽  
Ivan Tkáč
Keyword(s):  
Vasovagal Syncope ◽  
Tilt Test ◽  
Plasma Catecholamine ◽  
Head Up Tilt ◽  
Head Up Tilt Test

scholarly journals Clinical Features, Prodrome Types and Vasovagal Syncope Types in Passive and Nitrate Potentiated Head Up Tilt Test

2013 ◽  
Vol 62 (18) ◽  
pp. C48-C49
Author(s):  
Lale Dinç Asarcıklı ◽  
Habibe Kafes ◽  
Yesim Guray ◽  
Umit Guray ◽  
Esra Gucuk İpek ◽  
...  
Keyword(s):  
Clinical Features ◽  
Vasovagal Syncope ◽  
Tilt Test ◽  
Head Up Tilt ◽  
Head Up Tilt Test

Vasovagal Syncope: Diagnostic Role of Head-Up Tilt Test in Patients with Positive Ocular Compression Test

1990 ◽  
Vol 13 (11) ◽  
pp. 1416-1423 ◽  
Author(s):  
FREDRICK J. JAEGER ◽  
LORI SCHNEIDER ◽  
JAMES D. MALONEY ◽  
ROBERT P. CRUSE ◽  
FETNAT M. FOUAD-TARAZI
Keyword(s):  
Compression Test ◽  
Vasovagal Syncope ◽  
Tilt Test ◽  
Diagnostic Role ◽  
Head Up Tilt ◽  
Head Up Tilt Test

scholarly journals The Repolarization Period during the Head-Up Tilt Test in Children with Vasovagal Syncope

2020 ◽  
Vol 17 (6) ◽  
pp. 1908 ◽  
Author(s):  
Ewelina Kolarczyk ◽  
Grażyna Markiewicz-Łoskot ◽  
Lesław Szydłowski
Keyword(s):  
Vasovagal Syncope ◽  
Clinical Importance ◽  
Clinical Work ◽  
Ventricular Repolarization ◽  
Tilt Test ◽  
Wave Refraction ◽  
T Wave ◽  
Prolonged Duration ◽  
Head Up Tilt ◽  
Head Up Tilt Test

Background: Electrocardiography (ECG) and the head-up tilt test (HUTT) are vital in clinical work-up in children with vasovagal syncope (VVS). Ventricular repolarization parameters (QT) measured during the HUTT can be indicative of electrical instability; however, these parameters are not frequently assessed. This study aimed to investigate if ventricular repolarization parameters measured during the HUTT could be indicative of future ventricular arrhythmias in children with syncope. Methods: The shape and amplitude of the T-wave and parameters of the repolarization period (QT, QTpeak, Tpeak-Tend) were evaluated in a resting ECG performed on the first day of hospitalization and in ECGs performed during three phases of the HUTT. Results: In the after-tilt phase of the HUTT, 19/30 children displayed a change in T-wave morphology. QTc was significantly longer in VVS I compared to that in VVS II patients, but not in the controls (p = 0.092). Conclusions: We need further follow-up studies to establish the clinical importance of abnormal dynamics of the repolarization period in children with VVS and negative HUTT. Therefore, children with abnormal T-wave refraction and prolonged duration of the TpTe should remain under the care of a cardiological outpatient.

PW032 Evaluation of menstrual cycle influence on the results of head-up tilt test in women with suspected vasovagal syncope

Global Heart ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e269-e270
Author(s):  
Artur Z. Pietrucha ◽  
Joanna Jedrzejczyk-Spaho ◽  
Irena B. Bzukala ◽  
Danuta Mroczek-Czernecka ◽  
Mateusz Wnuk ◽  
...  
Keyword(s):  
Menstrual Cycle ◽  
Vasovagal Syncope ◽  
Tilt Test ◽  
Head Up Tilt ◽  
Head Up Tilt Test

Excessive myocardial contraction in vasovagal syncope demonstrated by echocardiography during head-up tilt test

1996 ◽  
Vol 19 (2) ◽  
pp. 137-140 ◽  
Author(s):  
Tsung-Ming Lee ◽  
Ming-Fong Chen ◽  
Chia-Lun Chao ◽  
Chiau-Suong Liau ◽  
Yuan-Teh Lee ◽  
...  
Keyword(s):  
Vasovagal Syncope ◽  
Myocardial Contraction ◽  
Tilt Test ◽  
Head Up Tilt ◽  
Head Up Tilt Test

scholarly journals Duration of head-up tilt test for patients with suspected vasovagal syncope

EP Europace ◽  
2011 ◽  
Vol 13 (4) ◽  
pp. 576-580 ◽  
Author(s):  
J. Liu ◽  
P. Fang ◽  
Y. Liu ◽  
G. Lu ◽  
Z. Li ◽  
...  
Keyword(s):  
Vasovagal Syncope ◽  
Tilt Test ◽  
Head Up Tilt ◽  
Head Up Tilt Test
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