Vol 61, No 11 (2004)
Other
Published online: 2005-12-12
Submitted: 2012-12-28
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Prognostic value of exercise-induced QT dispersion in patients after acute myocardial infarction

Bronisław Bednarz, Robert Wołk, Tomasz Chamiec, Leszek Ceremużyński
Kardiol Pol 2004;61(11):447-450.
Vol 61, No 11 (2004)
Other
Published online: 2005-12-12
Submitted: 2012-12-28

Abstract

Background: Electrocardiographic exercise tests are widely recommended for patients before discharge after myocardial infarction, what justify the search for new variables which may improve their prognostic value. QT dispersion in 12 lead ECG reflects the heterogeneity of ventricular repolarisation. Increased QT dispersion is a noninvasive marker of ischaemia and electrical instability.
Aim: Evaluation of the prognostic value of exercise-induced changes of QT dispersion in patients after an acute myocardial infarction.
Methods: Heart rate limited treadmill exercise test according to modified Bruce was performed 14±5 days after infarction in 77 patients (age 56±11,8 female). QT dispersion was measured at rest and on peak exercise. Patients were followed up for mean 88 months.
Results: QT dispersion was higher at peak exercise in those patients who died due to cardiovascular causes (n=8) or suffered from non-fatal myocardial infarction during follow-up (n=15), than in remaining group (71&#177;20 vs 58&#177;22 msec, p<0.01). At rest QT dispersion was similar in both groups (64&#177;17 vs 66&#177;20 msec, NS).
Conclusions: The lack of an exercise-induced decrease in QT dispersion identifies a subgroup of patients after myocardial infarction with a poor long-term prognosis.

Abstract

Background: Electrocardiographic exercise tests are widely recommended for patients before discharge after myocardial infarction, what justify the search for new variables which may improve their prognostic value. QT dispersion in 12 lead ECG reflects the heterogeneity of ventricular repolarisation. Increased QT dispersion is a noninvasive marker of ischaemia and electrical instability.
Aim: Evaluation of the prognostic value of exercise-induced changes of QT dispersion in patients after an acute myocardial infarction.
Methods: Heart rate limited treadmill exercise test according to modified Bruce was performed 14&#177;5 days after infarction in 77 patients (age 56&#177;11,8 female). QT dispersion was measured at rest and on peak exercise. Patients were followed up for mean 88 months.
Results: QT dispersion was higher at peak exercise in those patients who died due to cardiovascular causes (n=8) or suffered from non-fatal myocardial infarction during follow-up (n=15), than in remaining group (71&#177;20 vs 58&#177;22 msec, p<0.01). At rest QT dispersion was similar in both groups (64&#177;17 vs 66&#177;20 msec, NS).
Conclusions: The lack of an exercise-induced decrease in QT dispersion identifies a subgroup of patients after myocardial infarction with a poor long-term prognosis.
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Keywords

qt dispersion - exercise test - myocardial infarction - long term prognosis

About this article
Title

Prognostic value of exercise-induced QT dispersion in patients after acute myocardial infarction

Journal

Kardiologia Polska (Polish Heart Journal)

Issue

Vol 61, No 11 (2004)

Pages

447-450

Published online

2005-12-12

Bibliographic record

Kardiol Pol 2004;61(11):447-450.

Keywords

qt dispersion - exercise test - myocardial infarction - long term prognosis

Authors

Bronisław Bednarz
Robert Wołk
Tomasz Chamiec
Leszek Ceremużyński

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