| Autor: |
Beauregard LA; Department of Medicine, Cooper Hospital/University Medical Center, UMDNJ/Robert Wood Johnson Medical School, Camden, USA., Waxman HL, Volosin R, Volosin KJ, Kurnik PB |
| Jazyk: |
angličtina |
| Zdroj: |
Pacing and clinical electrophysiology : PACE [Pacing Clin Electrophysiol] 1996 Jun; Vol. 19 (6), pp. 883-9. |
| DOI: |
10.1111/j.1540-8159.1996.tb03383.x |
| Abstrakt: |
Signal averaging has been performed to evaluate late potentials following infarction and the administration of thrombolytic therapy. Most studies have recorded signal-averaged electrocardiograms (SAECGs) at least 12 hours after the onset of the infarction. In this study, SAECGs were recorded before thrombolytic therapy and serially over 7-10 days following infarction in 21 patients. The high frequency QRS duration was significantly shortened at 1 and 24 hours compared to presentation (96.8 +/- 11.3 ms and 93.4 +/- 8.0 ms vs 103.3 +/- 14.3 ms, respectively, P < 0.05) and there was an increase in the terminal voltage over time, significant at 1 hour and 3 days (57.3 +/- 29.1 microV and 58.6 +/- 44.7 microV vs 44.4 +/- 35.5 microV, respectively, P < 0.01). Five patients met criteria for ventricular late potentials on at least one SAECG. The prevalence of late potentials was higher in patients with Q wave infarctions, or with occluded infarct related arteries. These changes in myocardial activation may be related to ischemia and reperfusion, and may not correlate with the development of a fixed substrate for reentry. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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