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. 2007 Mar;99(3):232–237.

Cardiac repolarization abnormalities and increased sympathetic activity in scleroderma.

Orcun Ciftci 1, Ahmet Mesut Onat 1, Bunyamin Yavuz 1, Ali Akdogan 1, Kudret Aytemir 1, Lale Tokgozoglu 1, Levent Sahiner 1, Ali Deniz 1, Kemal Ureten 1, Guler Kizilca 1, Meral Calguneri 1, Ali Oto 1
PMCID: PMC2569635  PMID: 17393947

Abstract

BACKGROUND: Cardiac involvement in scleroderma is a poor prognostic sign and is usually underdiagnosed, particularly in asymptomatic patient. This paper focuses on QT dynamicity and heart rate variability (HRV) in patients with scleroderma and controls in an attempt to investigate the cardiac autonomic system and ventricular repolarization. METHODS: Sixty patients with scleroderma and 30 age- and sex-matched healthy controls who had no cardiovascular risk factors were included in this study. All patients and the controls underwent a 24-hour holter recording as well as a transthoracic echocardiography. HRV and QT dynamicity parameters were calculated. RESULTS: In HRV analysis, autonomic balance was changed in favor of the sympathetic system in patients with diffuse scleroderma. In QT dynamicity analysis, QT/RR slopes were significantly steeper in patients with diffuse scleroderma compared to patients with limited scleroderma and controls (QTapex/RR: 0.24 +/- 0.16, 0.15 +/- 0.03, 0.14 +/- 0.03 respectively p < 0.001; QTend/RR: 0.26 +/- 0.17, 0.14 +/- 0.04, 0.13 +/- 0.05, respectively p < 0.001). CONCLUSIONS: Patients with diffuse scleroderma may have asymptomatic cardiac repolarization abnormalities and autonomic dysfunction. Our results may indicate that QT dynamicity and HRV can be useful noninvasive methods that may detect impaired state of autonomic balance and cardiac repolarization in patients with diffuse scleroderma.

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Selected References

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