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- Title
QT interval dispersion analysis in patients undergoing left partial ventriculectomy (Batista operation).
- Authors
Pastore, Carlos Alberto; Arcêncio, Sandra Regina; Tobias, Nancy M. M. O.; Kaiser, Elisabeth; Filho, Martino Martinelli; Moreira, Luis Felipe P.; Stolf, Noedir A.; Bocchi, Edimar; Ramires, José Antonio Franchini; Arcêncio, Sandra Regina; Ramires, José Antonio Franchini
- Abstract
<bold>Background: </bold>QT interval dispersion (QTd) has been valued as a marker of increased vulnerability for cardiac arrhythmias. QTd was analyzed in patients undergoing the left partial ventriculectomy (LPV) or Batista operation, a palliative surgery for patients in the line for heart transplantation, which is associated with complex arrhythmia and death from sustained ventricular tachyarrhythmia (SVT).<bold>Methods: </bold>Pre- and postoperative R-R, QT, QTc, JT (QT - QRS), and aT (apex to end of T wave) intervals were obtained by 87-lead body surface mapping from 24 patients (18 male), mean age 46.4 +/- 9.15 years. Dispersions of QT, QTc, JT, and aT intervals were calculated, and the total number of arrhythmic events were assessed, aiming to verify a possible risk predictor for the occurrence of SVTs. Subgroups of patients who survived and who died after LPV were also compared, aiming to obtain a QTd cutoff value that could be used prognostically.<bold>Results: </bold>No difference between pre- and postoperative mean values were found, but a very significant difference was seen when comparing QTd and QTcD values for surviving and dead patients: QTd, cutoff value was 95 ms, while QTcD value was 114 ms.<bold>Conclusion: </bold>There were no significant differences between pre- and postoperative variables or the number of arrhythmic events, but there were significant differences between both pre- and postoperative QTd and QTcD data from surviving and dead patients; this enabled the determination of cutoff values that we believe may be useful for the prognosis of the LPV outcome.
- Subjects
CONGESTIVE heart failure; HEART failure risk factors; HEART diseases; PARTIAL left ventriculectomy; LEFT heart ventricle surgery; AMBULATORY electrocardiography; BODY surface mapping; HEART conduction system; HEART failure; NONPARAMETRIC statistics; VENTRICULAR tachycardia; LOGISTIC regression analysis
- Publication
Annals of Noninvasive Electrocardiology, 2004, Vol 9, Issue 4, p375
- ISSN
1082-720X
- Publication type
journal article
- DOI
10.1111/j.1542-474X.2004.94582.x