A prospective evaluation of the immediate reproducibility of the signal-averaged ECG
| Autor: | Josef Widerhorn, Shahbudin H. Rahimtoola, Anil K. Bhandari, Cheryl Leon, Maria Luz G Pascual, Philip T. Sager |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
medicine.medical_specialty
Reproducibility Electrodiagnosis medicine.diagnostic_test business.industry Retarded potential Individuality Reproducibility of Results Arrhythmias Cardiac Signal-averaged electrocardiogram Prospective evaluation Signal-averaged electrocardiography Surgery QRS complex Electrocardiography Evaluation Studies as Topic Internal medicine Cardiology medicine Humans In patient Diagnosis Computer-Assisted Prospective Studies Cardiology and Cardiovascular Medicine business |
| Zdroj: | American heart journal. 121(6 Pt 1) |
| ISSN: | 0002-8703 |
| Popis: | The purpose of this investigation was to prospectively evaluate the immediate reproducibility of the signal-averaged electrocardiogram (SAECG). A total of 114 patients undergoing evaluation for ventricular arrhythmias were enrolled in this protocol. Two consecutive SAECG's (40 Hz bidirectional high-pass filtering with a computer-automated system) were performed 10 minutes apart. Abnormal SAECG parameters were defined as (1) vector QRS duration more than 120 msec, (2) terminal root mean square (RMS) voltage less than 20 microV, and (3) low-amplitude signal (LAS) duration more than 40 msec. An SAECG was defined as abnormal if at least one vector parameter was abnormal. There was close correlation between vector parameters during the two SAECG observations: QRS duration had the highest reproducibility (r2 = 0.97, p less than 0.001) followed by terminal RMS voltage (r2 = 0.92, p less than 0.001), and LAS duration (r2 = 0.90, p less than 0.001). The mean (+/- SD) percentage of change between the two recordings was 2% +/- 2% of the QRS duration, 13% +/- 22% for terminal RMS voltage, and 7% +/- 11% for LAS duration. The reproducibility of an initially normal SAECG was 92% and of an initially abnormal SAECG, 96%. Seventeen patients (15%) had a change in one of the three vector parameters between the two recordings. There were no clinically significant differences between the 17 patients in whom the SAECG was nonreproducible and the 97 patients in whom the SAECG was reproducible. However, reproducibility was significantly higher in patients with an initially normal versus an initially abnormal SAECG (92% vs 76%, p = 0.03).(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
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