Abstract:
BACKGROUND:The purpose of this study was to examine the effects of carvedilol therapy on autonomic control of the heart and QT-interval dispersion (QTd) among children with idiopathic dilated cardiomyopathy (DCM) whose symptoms were not adequately controlled with standard congestive heart failure therapy. MATERIAL AND METHODS:Patients with DCM who were treated with carvedilol were enrolled in the study. All patients had undergone carvedilol therapy in addition to standard therapy for at least 6 months. Clinical, echocardiographic, and electrocardiographic parameters, and 24-h Holter records of patients were retrospectively evaluated before and after carvedilol treatment. RESULTS:A total 34 patients (mean age: 7.4 ± 4.3 years) with DCM were analyzed in the study. The median follow-up period was 9.5 months. After the 6 months of carvedilol therapy the clinical score significantly improved, left ventricular ejection fraction (LVEF) and fractional shortening (LVFS) significantly increased, and left ventricle end-diastolic dimensions and end-systolic dimensions significantly decreased. There were statistically significant increases in mean SDNN, SDANN, rMSSD, and pNN50 (p = 0.002, p = 0.001, p = 0.008, and p = 0.026, respectively). After the carvedilol therapy, SDNN was correlated with the clinical score, heart rate, LVEF, LVFS, and total premature ventricular contractions (PVCs). In addition, rMSSD and pNN50 were correlated with heart rate, LVEF and LVFS. A significant reduction was observed in QTc-minimum, QTc-maximum, and QTd values (434.9 ± 40.7 vs. 416.1 ± 36.5, 497.8 ± 43.6 vs. 456.3 ± 41.7, 58.6 ± 17.1 vs. 49.3 ± 15.6; p < 0.001, p = 0.001, and p = 0.008, respectively). QTd was significantly related to PVCs (r = 0.62, p = 0.02). CONCLUSIONS:We conclude that the addition of carvedilol to standard therapy can improve clinical symptoms and heart rate variability, and reduce in arrhythmia markers in children with DCM.
journal_name
Med Sci Monitjournal_title
Medical science monitor : international medical journal of experimental and clinical researchauthors
Oflaz MB,Balli S,Kibar AE,Ece I,Akdeniz C,Tuzcu Vdoi
10.12659/MSM.883911subject
Has Abstractpub_date
2013-05-15 00:00:00pages
366-72eissn
1234-1010issn
1643-3750pii
883911journal_volume
19pub_type
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journal_title:Medical science monitor : international medical journal of experimental and clinical research
pub_type: 杂志文章
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journal_title:Medical science monitor : international medical journal of experimental and clinical research
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journal_title:Medical science monitor : international medical journal of experimental and clinical research
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journal_title:Medical science monitor : international medical journal of experimental and clinical research
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