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Open Access Research article

QT dispersion in patients with systemic lupus erythematosus: the impact of disease activity

Javad Kojuri13*, Mohammad ali Nazarinia2, Mohammad Ghahartars1, Yadollah Mahmoody1, Gholam reza Rezaian1 and Lida Liaghat1

Author Affiliations

1 Cardiology Department, Shiraz University of Medical Sciences, Shiraz, Iran

2 Internal Medicine Department, Rheumatology Group, Shiraz University of Medical Sciences, Shiraz, Iran

3 Medical education, Cardiologist, Interventionis,t Cardiology Department, Namazi Hospital, Zand St., Shiraz, Iran

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BMC Cardiovascular Disorders 2012, 12:11  doi:10.1186/1471-2261-12-11

Published: 27 February 2012

Abstract

Background

Patients with systemic lupus erythematosus (SLE) have increased cardiovascular morbidity and mortality. Although autopsy studies have documented that the heart is affected in most SLE patients, clinical manifestations occur in less than 10%. QT dispersion is a new parameter that can be used to assess homogeneity of cardiac repolarization and autonomic function. We compared the increase in QT dispersion in SLE patients with high disease activity and mild or moderate disease activity.

Methods and Results

One hundred twenty-four patients with SLE were enrolled in the study. Complete history and physical exam, ECG, echocardiography, exercise test and SLE disease activity index (SLEDAI) were recorded. Twenty patients were excluded on the basis of our exclusion criteria. The patients were divided to two groups based on SLEDAI: 54 in the high-score group (SLEDAI > 10) and 50 in the low-score group (SLEDAI < 10).

QT dispersion was significantly higher in high-score group (58.31 ± 18.66 vs. 47.90 ± 17.41 respectively; P < 0.004). QT dispersion was not significantly higher in patients who had received hydroxychloroquine (54.17 ± 19.36 vs. 50.82 ± 15.96, P = 0.45) or corticosteroids (53.58 ± 19.16 vs. 50.40 + 11.59, P = 0.47). There was a statistically significant correlation between abnormal echocardiographic findings (abnormalities of pericardial effusion, pericarditis, pulmonary hypertension and Libman-Sacks endocarditis) and SLEADI (P < 0.004).

Conclusions

QT dispersion can be a useful, simple noninvasive method for the early detection of cardiac involvement in SLE patients with active disease. Concerning high chance of cardiac involvement, cardiovascular evaluation for every SLE patient with a SLEDAI higher than 10 may be recommended.

Trial registration

Clinicaltrial.gov registration NCT01031797

Keywords:
SLE; Disease activity score; QT dispersion