Abstract:
BACKGROUND AND PURPOSE:Descriptions of the significance of ST segment or QRS abnormalities in myocarditis are limited because documentation of the diagnosis has previously required myocardial biopsy. Late gadolinium enhancement (LGE) and T2 weighted imaging in the midventricular wall on cardiac magnetic resonance imaging (CMRI) has a very good positive predictive value for the diagnosis of myocarditis. We hypothesized to reexplore the diagnostic value of these electrocardiographic (ECG) changes in myocarditis by utilizing CMRI as the reference standard. METHODS:Data on demographics, clinical presentation, laboratory tests, echocardiograms, coronary angiograms, and computed tomography angiography of 41 consecutive patients with definite midventricular or subepicardial LGE and T2 weighted imaging on CMRI were extracted from the available clinical records. ECGs were blindly examined by two independent readers and divided based on (a) STT changes into: 1. No STT changes, 2. STT changes but no ST elevation, 3. ST elevation (STE); and (b) the presence or absence of QRS abnormalities. Associations of these ECG changes with differences in left ventricular ejection fraction, as measured from CMRI was the main aim of this study. In addition, a complete clinical profile of these patients with myocarditis as identified by CMRI was also created. RESULTS:80% of our study population were male with a mean age of 38.6±15.5 and a paucity of traditional cardiovascular risk factors (<30%). 90% presented with chest pain with more than half having dyspnea and a viral prodrome, but fever was infrequent (15%). Peak troponin-I and creatine kinase-MB levels exceeded the upper limit of normal in latest 85%, often by more than 5 times the limit. 18% had a coronary luminal narrowing of ≥50%, while 56% had echocardiographic wall motion abnormalities. The left ventricular ejection fraction averaged 54.3±10.8%. In 24.4% of patients, the ECG was entirely normal; while 39% had STE. STT changes did not detect any differences in the ejection fraction. An abnormal QRS, which was present in 29%, was associated with a lower left ventricular ejection fraction (p=0.005). CONCLUSIONS:Patients with clinical features suggestive of myocarditis and confirmatory CMRI findings, can present with a variety of ECG findings, some of which have the potential to identify those with a worse cardiac function, and potentially with a worse prognosis.
journal_name
J Electrocardioljournal_title
Journal of electrocardiologyauthors
Jhamnani S,Fuisz A,Lindsay Jdoi
10.1016/j.jelectrocard.2014.07.018subject
Has Abstractpub_date
2014-11-01 00:00:00pages
941-7issue
6eissn
0022-0736issn
1532-8430pii
S0022-0736(14)00292-1journal_volume
47pub_type
杂志文章abstract::This study describes a method for improving the day-to-day and minute-to-minute repeatability of the deterministic computer-assisted diagnosis of left ventricular hypertrophy. Conventional upper limits of normal for many age-dependent electrocardiographic parameters have been replaced by continuous equations, thereby,...
journal_title:Journal of electrocardiology
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
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journal_title:Journal of electrocardiology
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journal_title:Journal of electrocardiology
pub_type: 临床试验,杂志文章
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journal_title:Journal of electrocardiology
pub_type: 临床试验,杂志文章
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journal_title:Journal of electrocardiology
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更新日期:1995-10-01 00:00:00
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journal_title:Journal of electrocardiology
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更新日期:1984-04-01 00:00:00
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