E. Kyrozi

Onassis Cardiac Surgery Center

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Dennis V. Cokkinos

Academy of Athens

Maria Koutelou

Onassis Cardiac Surgery Center

Antonis S. Manolis

Ippokrateio General Hospital of Thessaloniki

Virginia Tsapaki

Agia Olga Hospital

Themistoklis Maounis

Onassis Cardiac Surgery Center

John Chiladakis

General University Hospital of Patras

N. Kollaros

National and Kapodistrian University of Athens

Sofia Kottou

National and Kapodistrian University of Athens

V. Vassilikos

Aristotle University of Thessaloniki

K. Katsaros

Digital Catapult (United Kingdom)

Cooperative Institutions

NewYork–Presbyterian Hospital

Columbia University

Onassis Cardiac Surgery Center

Columbia University Irving Medical Center

New York Hospital Queens

Harvard University

Brigham and Women's Hospital

Cornell University

Istituti di Ricovero e Cura a Carattere Scientifico

All India Institute of Medical Sciences

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European Journal of Nuclear Medicine and Molecular Imaging (2019)

Athanasios Katsikis E. Kyrozi Vasiliki Manira Athanasios Theodorakos J. Malamitsi

Regadenoson

10.1007/s00259-019-04463-9

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Citations (8)

Comparison of heart rate variability parameters calculated by two different commercial analysis systems

Computers in cardiology (2002)

E. Kyrozi Themistoklis Maounis K. Katsaros V. Vassilikos John Chiladakis

The heart rate variability parameters in the time and frequency domain are compared between two commercial Holter systems (Oxford Excel II ver7.1, and Marquette Laser S ver002A). A total of 35 recordings were analyzed by both systems. In the time domain, the standard deviation of the normal RR intervals (SDNN), the mean of the 5 minute standard deviations for the normal RR intervals (SDNNi), the standard deviation of the 5 minute average for the RR intervals (SDANNi), the root mean square of differences in successive RR intervals (rMSSD), and the percentage of intervals that are at least 50 msec different from the previous one (pNN50) were measured. The total power and the low and high frequency power were estimated by spectral analysis. All time and frequency domain parameters were closely correlated (p<0.001), however InHFP and rMSSD were significantly higher when analyzed by the Oxford system. These differences should be considered when results obtained by different systems are compared.

RR interval

Root mean square

Relative standard deviation

Spectral Analysis

10.1109/cic.1995.482605

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Regression of left ventricular hypertrophy results in improvement of QT dispersion in patients with hypertension

American Heart Journal (1998)

Eva A. Karpanou Gregory P. Vyssoulis Apostolos Psichogios Christina Malakou E. Kyrozi

10.1016/s0002-8703(98)70119-x

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Citations (68)

Comparison of Signal‐Averaged Electrocardiograms with Different Levels of Noise: Time‐Domain, Frequency‐Domain, and Spectrotemporal Analysis

Pacing and Clinical Electrophysiology (1997)

Themistoclis Maounis E. Kyrozi John Chiladakis Vassilios Vassilikos Antonis S. Manolis

In order tn test the effect of noise on the various parameters of the SAECG, 83 patients underwent three consecutive recordings at different noise levels. The high noise (HN) recordings had a noise level of 0.60–0.74 μV. the intermediate noise (IN) had 0.31–0.59 μV, and the low noise (LN) had ≤ 0.30 μV. For the calculation of noise we used the standard deviation of the mean noise of the composite lead high pass filtered at 40 Hz. The recordings were compared using time‐domain, frequency‐domain, and spectrotemporal analysis. The time‐domain parameters of the LN recordings, using 25‐Hz, 40‐Hz, and 60‐Hz high pass cutoffs, were significantly different from those of the HN or IN recordings (P < 0.05). In the frequency‐domain analysis, significant differences were found in some of the parameters of the LN compared to the HN. The spectrotemporal analysis of the X and Z leads also showed significant differences among the LN and the other recordings. In the time‐domain analysis, both at 40 Hz and 25 Hz, there were more abnormal LN compared to the HN recordings (P < 0.05). In the spectrotemporal analysis, there were significantly more abnormal HN and IN recordings compared to the LN (P < 0.001 and P < 0.01. respectively). Therefore, the level of noise, even within the acceptable range, can significantly affect the SAECG. In the time domain at the lower noise levels the parameters become more abnormal, while the opposite seems to occur in the spectral and the spectrotemporal analysis.

Signal-averaged electrocardiogram

10.1111/j.1540-8159.1997.tb03886.x

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Citations (2)

4.38

Journal of Nuclear Cardiology (2007)

Maria Koutelou Athanassios Theodorakos Άννα Κωστοπούλου G. Theodorakis N. Kollaros

10.1016/j.nuclcard.2006.12.118

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Atrial arrhythmias early after cardioversion predict recurrence of atrial fibrillation

Journal of the American College of Cardiology (1998)

Themistoklis Maounis E. Kyrozi E. Evgeniadou K. Katsaros E. Bilianou

P wave

10.1016/s0735-1097(98)81440-x

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Establishment of computed tomography reference dose levels in Onassis Cardiac Surgery Center

Virginia Tsapaki E. Kyrozi T. Syrigou I. Mastorakou Σοφία Κόττου

Center (category theory)

Source

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Short-term reproducibility of the time and frequency domain parameters of heart rate variability

Computers in cardiology (2002)

E. Kyrozi Themistoklis Maounis John Chiladakis V. Vassikikos Antonis S. Manolis

The reproducibility of heart rate variability (HRV) from 24 hour recordings has been established. But it has not been evaluated in the time and frequency domain whether short electrocardiographic segments show reproducible measurements. The authors analyzed Holter recordings of 28 patients and HRV was estimated in two sequential 10 min segments. The analysis was performed with the Oxford Excell II ver. 7.1 system. Both time and frequency domain parameters were found to be highly reproducible in the two successive segments. Consequently, comparison of short electrocardiographic segments is valid and they can be used in order to assess the effect of various interventions on the HRV.

10.1109/cic.1995.482690

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Citations (1)

The Prognostic Significance of Atrial Arrhythmias Recorded Early After Cardioversion for Atrial Fibrillation

Pacing and Clinical Electrophysiology (2001)

THEMISTOCLIS MAOUNIS E. Kyrozi KONSTANTINOS KATSAROS E. Bilianou Vassilios Vassilikos

In a substantial number of patients, AF recurs after successful electrical cardioversion. The purpose of this study was to investigate if the atrial arrhythmias recorded immediately after cardioversion are associated with the risk of recurrence of the arrhythmia and to compare the prognostic significance of this parameter with that of other established risk factors. In a series of 71 patients, the risk factors for recurrence of AF during the first year after successful electrical cardioversion were analyzed. A new parameter that was investigated was the frequency of atrial premature beats and the presence of runs of supraventricular tachycardia in the Holter recording started immediately after the cardioversion. Age, left atrial size, left ventricular systolic function, duration of the arrhythmia before cardioversion, underlying cardiac disease, or medication taken were not found to be predictive of recurrence of the arrhythmia. However, the natural logarithm of the number of atrial premature complexes per hour of the Holter recording in the 37 patients in whom AF recurred was higher compared to that of the 34 patients who maintained sinus rhythm (P < 0.0005). The same was true if only the first 6 hours of the recording were analyzed (P < 0.0005). There was a trend for more frequent arrhythmia recurrence if runs of supraventricular tachycardia were present. The finding of > 10 atrial premature complexes per hour in the recording had a relative risk of 2.57 (1.51-4.37), a positive predictive accuracy of 76.5%, and a negative predictive accuracy of 70.3% for subsequent arrhythmia recurrence. We can conclude that frequent (> 10/hour) atrial premature complexes in the Holter recording after electrical cardioversion for AF is a significant risk factor for recurrence of the arrhythmia.

P wave

Atrial tachycardia

10.1046/j.1460-9592.2001.01076.x

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Citations (12)

Patient dose values in a dedicated Greek cardiac centre

British Journal of Radiology (2003)

Virginia Tsapaki Sofia Kottou E. Vañó K. Faulkner J Giannouleas

The purpose of this study was to collect information on the practice and patient doses in a major Greek cardiac centre, investigate differences between senior cardiologists of various levels of experience and compare results with the literature, in order to optimize angiographic and interventional cardiology procedures. Radiation doses from 292 patients have been studied, 195 of which had undergone coronary angiography and 97 percutaneous transluminal coronary angioplasty. All procedures were undertaken on a Siemens Angioscop X-ray equipment. The system performed under automatic exposure control using pulsed fluoroscopy of 12.5 pulses s(-1) and cine frame rate of 25 frames s(-1). Dose-area product values, fluoroscopy times, total number of cine frames as well as operator's name were collected for each patient. Only senior cardiologists have participated in the study. Median values for dose-area product were 39.1 Gy cm(2) for coronary angiography and 58.3 Gy cm(2) for percutaneous transluminal coronary angioplasty. Median fluoroscopy time was 5.0 min and 9.7 min and median number of frames was 1588 and 1823 for coronary angiography and percutaneous transluminal coronary angioplasty, respectively. Comparison showed that patient dose-area product values were lower than other studies and fluoroscopy time values were comparable. However, the total number of frames used was much higher than other published results. Differences between cardiologists with increased experience have been found. Analysis of the patient dose values obtained initiated a program of radiation protection optimization. The need for continuous training in radiation protection for interventionalists has been verified.

Dose area product

Interventional cardiology

10.1259/bjr/73325000

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Citations (55)