The effect of sleep apnea on QT interval, QT dispersion, and arrhythmias

Kitti Barta, Z. Szabó, Csaba Kun, Csaba Munkácsy, Orsolya Bene, M. Magyar, L. Csiba, István Lörincz

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Background: QT interval (QT) and QT dispersion (QTd) are electrocardiograph (ECG) parameters for the evaluation of myocardial repolarization. The inhomogeneity of ventricular repolarization is associated with ventricular arrhythmias. An increased QT, QTd, and increased incidence of nocturnal cardiac rhythm disturbances have been described in patients with obstructive sleep apnea (OSA), while other investigators did not find a relationship between ventricular arrhythmias and OSA. Hypothesis: The aim of this study was to examine the occurrence of ventricular arrhythmias and to measure QT parameters in patientswith untreated OSA using an ambulatory Holter-ECG. Methods: A total of 25 patients with untreated OSA were studied. After routine biochemical investigation and 2-dimensional, M-mode echocardiography, a 24-hour Holter-ECG was recorded to detect cardiac arrhythmias and QT parameters. QT parameters were measured by the QT Guard system. Results: Only the QT interval increased significantly during the nighttime period (nocturnal QT interval: 423.1±34.6 ms, daytime QT interval: 381.6±33.8 ms, 24-hour QT interval: 394.7±31.1 ms). However, during the nighttime QT interval (422.8±14.9 ms), QTd (31.2±11.0 ms) and QT dispersion (30.5±10.2 ms) did not show any change compared to 24-hour (QTc interval: 423.7±14.2 ms, QTd: 28.8±9.4 ms, QTcd: 30.5±9.43 ms) and daytime levels (QTc interval:423.9±14.3 ms, QTd: 27.3±10.7 ms, QTcd: 29.9±11.1 ms). None of the patients had ventricular arrhythmias. Conclusions: QTd and QTcd did not increase during the nighttime period. Our study did not show an increased risk of ventricular arrhythmias in this population during the monitoring period.

Original languageEnglish
JournalClinical Cardiology
Volume33
Issue number6
DOIs
Publication statusPublished - Jun 2010

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Sleep Apnea Syndromes
Cardiac Arrhythmias
Obstructive Sleep Apnea
Electrocardiography
Echocardiography
Research Personnel
Incidence
Population

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Medicine(all)

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The effect of sleep apnea on QT interval, QT dispersion, and arrhythmias. / Barta, Kitti; Szabó, Z.; Kun, Csaba; Munkácsy, Csaba; Bene, Orsolya; Magyar, M.; Csiba, L.; Lörincz, István.

In: Clinical Cardiology, Vol. 33, No. 6, 06.2010.

Research output: Contribution to journalArticle

Barta, Kitti ; Szabó, Z. ; Kun, Csaba ; Munkácsy, Csaba ; Bene, Orsolya ; Magyar, M. ; Csiba, L. ; Lörincz, István. / The effect of sleep apnea on QT interval, QT dispersion, and arrhythmias. In: Clinical Cardiology. 2010 ; Vol. 33, No. 6.
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abstract = "Background: QT interval (QT) and QT dispersion (QTd) are electrocardiograph (ECG) parameters for the evaluation of myocardial repolarization. The inhomogeneity of ventricular repolarization is associated with ventricular arrhythmias. An increased QT, QTd, and increased incidence of nocturnal cardiac rhythm disturbances have been described in patients with obstructive sleep apnea (OSA), while other investigators did not find a relationship between ventricular arrhythmias and OSA. Hypothesis: The aim of this study was to examine the occurrence of ventricular arrhythmias and to measure QT parameters in patientswith untreated OSA using an ambulatory Holter-ECG. Methods: A total of 25 patients with untreated OSA were studied. After routine biochemical investigation and 2-dimensional, M-mode echocardiography, a 24-hour Holter-ECG was recorded to detect cardiac arrhythmias and QT parameters. QT parameters were measured by the QT Guard system. Results: Only the QT interval increased significantly during the nighttime period (nocturnal QT interval: 423.1±34.6 ms, daytime QT interval: 381.6±33.8 ms, 24-hour QT interval: 394.7±31.1 ms). However, during the nighttime QT interval (422.8±14.9 ms), QTd (31.2±11.0 ms) and QT dispersion (30.5±10.2 ms) did not show any change compared to 24-hour (QTc interval: 423.7±14.2 ms, QTd: 28.8±9.4 ms, QTcd: 30.5±9.43 ms) and daytime levels (QTc interval:423.9±14.3 ms, QTd: 27.3±10.7 ms, QTcd: 29.9±11.1 ms). None of the patients had ventricular arrhythmias. Conclusions: QTd and QTcd did not increase during the nighttime period. Our study did not show an increased risk of ventricular arrhythmias in this population during the monitoring period.",
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