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Relationship between infarction location and size to QT dispersion in patients with chronic myocardial infarction
Nobuyuki Hashimoto1, Haruki Musha, Atsushi Ozawa
1Department of Cardiology, Yokohama City Seibu Hospital, St. Marianna University School of Medicine, Kanagawa, Japan.
Insights
Myocardial infarction location and size significantly impact QT dispersion in chronic patients. Anterior infarcts show higher QT dispersion, especially larger ones, influencing data interpretation.
Area of Science:
- Cardiology
- Electrophysiology
- Clinical Research
Background:
- QT dispersion is a marker of cardiac electrical instability.
- Myocardial infarction can alter cardiac electrophysiology, potentially affecting QT dispersion.
Purpose of the Study:
- To investigate the influence of myocardial infarction location and size on QT dispersion.
- To determine if specific infarct characteristics correlate with increased QT dispersion.
Main Methods:
- Studied 84 Japanese patients with chronic myocardial infarction (anteroseptal and inferior infarcts).
- Included a control group of 23 subjects without ischemic heart disease.
- Measured corrected QT dispersion (QTc dispersion) in all participants.
Main Results:
- QTc dispersion was significantly higher in the anterior infarction group compared to controls.
- No significant difference in QTc dispersion was observed in the inferior infarction group versus controls.
- Larger anterior infarcts were associated with significantly greater QTc dispersion than smaller anterior infarcts.
Conclusions:
- Infarct location and size are significant determinants of QT dispersion in chronic myocardial infarction.
- Clinical interpretation of QT dispersion requires consideration of infarct characteristics.
Abstract:
The relationship between the location and size of an infarction and QT dispersion was investigated in 84 Japanese patients with chronic myocardial infarction (54 with anteroseptal infarction and 30 with inferior infarction). The control group consisted of 23 subjects without ischemic heart disease (13 normal subjects and 10 hypertensive patients). Corrected QT dispersion (maximum corrected QT interval minus minimum corrected QT interval: QTc dispersion), was significantly larger in the anterior infarction group than in the control group (69.9+/-21.5 msec vs 53.0+/-17.6 msec), while the inferior infarction group showed no significant difference from control subjects. QTc dispersion was significantly greater in the patients with large anterior infarcts than in those with small anterior infarcts (80.5+/-20.5 msec vs 61.9+/-18.8 msec). In patients with chronic myocardial infarction, QT dispersion is influenced by the infarct location and size. Accordingly, interpretation of QT dispersion data should take these factors into consideration.
