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Prevalence and clinical correlates of QT prolongation in patients with hypertrophic cardiomyopathy.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Johnson, Jonathan N. Grifoni, Camilla Bos, J. Martijn Saber-Ayad, Maha M. Ommen, Steve Nistri, Stefano Cecchi, Francesca Olivotto, Ike Ackerman, Michael J. |
| Copyright Year | 2011 |
| Abstract | AIMS Congenital or acquired QT prolongation is a risk factor for life-threatening arrhythmias. In patients with hypertrophic cardiomyopathy (HCM), the QT interval may be intrinsically prolonged. However, the prevalence, cause, and significance of QT prolongation among patients with HCM are unknown. METHODS AND RESULTS After exclusion of patients on QT-prolonging drugs, a blinded, retrospective analysis of electrocardiograms, echocardiograms, and genotype status in 479 unrelated patients with HCM [201 females, age at diagnosis 41 ± 18 years, maximal left ventricular wall thickness (MLVWT) 22 ± 6 mm] from two independent centres was performed. The mean QTc was 440 ± 28 ms. The QTc exceeded 480 ms in 13% of patients. Age, gender, family history of HCM or sudden cardiac arrest, and genotype status had no association with QTc. Patients with a QTc over 480 ms were more symptomatic at diagnosis (P < 0.001), had a higher MLVWT (P = 0.03), were more obstructive (P < 0.001), and were more likely to have undergone septal reduction therapy (P = 0.02). There was a weak but significant direct linear relationship between QTc and peak outflow gradient (r(2) = 0.05, P < 0.0001). CONCLUSIONS Compared with <1 in 200 otherwise healthy adults, QT prolongation (QTc > 480 ms) was present in 1 out of 8 patients with HCM. The QTc was partly reflective of the degree of cardiac hypertrophy and left ventricular outflow tract obstruction. Because of its pro-arrhythmic potential and its potential relevance to management and risk stratification, routine QTc assessment should be performed in patients with HCM, particularly when concomitant use of QT-prolonging medications is considered. |
| Starting Page | 1 |
| Ending Page | 37 |
| Page Count | 37 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/eurheartj/32/9/10.1093/eurheartj/ehr021/2/ehr021.pdf?Expires=1493073941&Key-Pair-Id=APKAIUCZBIA4LVPAVW3Q&Signature=Mcfx3YvseV5TP53re2yiZU6ivCD-duBcixL01Er4-Ol6fxpTSB3JRB1lYswVp8Hmz7N~gAgD9oqAL1P-UN~Pl0VKocVIGJXMb7~K2UN4mCIh4J9tIogNHK0x1NETtmie83kEf~fl5cL0TuT~41iJ0mnTjJLXjfHIBmjq5jVJWetPXZCxeSJD8Czh13WsL0HT3FKkZnq58cc17efkWTQEJiFnCBguyMmEa5igedIyEJq0-LV-ij38cVihlO2Ey5bouS9KmjMHu0l~nSN8U2nqxDY4mW~iCEHUohk5XTEDgo0AvfWNc7Yr4sqW3wa~165ARVSGzUXwfz0tQ3DVHi6FXQ__ |
| PubMed reference number | 21345853v1 |
| Alternate Webpage(s) | https://doi.org/10.1093/eurheartj/ehr021 |
| DOI | 10.1093/eurheartj/ehr021 |
| Journal | European heart journal |
| Volume Number | 32 |
| Issue Number | 9 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | American Heart Association Artificial cardiac pacemaker Cardiac Hypertrophy Cardiomyopathies Cardiomyopathy, Dilated Cholestasis Echocardiography Exclusion Hypertrophic Cardiomyopathy Left ventricular outflow tract obstruction Long QT Syndrome Patients Premature ventricular contractions Primed In Situ Labeling Stratification Sudden Cardiac Arrest Sudden Cardiac Death Ventricular Fibrillation Wall of left ventricle Wall of ventricle |
| Content Type | Text |
| Resource Type | Article |
