The relation between QT interval and T-wave variables in hypertensive patients

Relation between beat-to-beat QT interval variability and T-wave amplitude in healthy subjects.

OBJECTIVES Elevated beat-to-beat QT interval variability (QTV) has been associated with increased cardiovascular morbidity and mortality.The aim of this study was to investigate interlead differences in beat-to-beat QTV of 12-lead ECG and its relationship with the T wave amplitude. METHODS Short-term 12-lead ECGs of 72 healthy subjects (17 f, 38 ± 14 years; 55 m, 39 ± 13 years) were studied. ...

Beat-to-beat QT interval variability and T-wave amplitude in patients with myocardial infarction.

The purpose of this study was to investigate the effects of T-wave amplitude and ECG lead on beat-to-beat QT interval variability (QTV) in patients with myocardial infarction (MI) compared to healthy subjects. Standard resting 12-lead ECGs of 79 MI patients and 69 healthy subjects were investigated. Beat-to-beat QT intervals were measured separately for each lead using a template matching algor...

Relation between the behaviors of P-wave and QT dispersions in elderly patients with heart failure.

OBJECTIVE To assess the relation between P-wave and QT dispersions in elderly patients with heart failure. METHODS Forty-seven elderly patients (75.6+/-6 years) with stable heart failure in NYHA functional classes II or III and with ejection fractions of 37+/-6% underwent body surface mapping to analyze P-wave and QT dispersions. The degree of correlation between P-wave and QT dispersions was...

Effect of atropine on the QT interval and T-wave amplitude in healthy volunteers.

Prolongation of the QT interval of the ECG represents an imbalance in cardiac autonomic function and may predict cardiac arrhythmia. Vagal activity protects against prolongation of the QT interval which may be associated with flattening of the T-wave of the ECG. The changes in QT interval, T-wave amplitude and respiratory sinus arrhythmia (RSA) were studied after i.v. administration of atropine...

The effect of different stressors on the QT interval and the T wave Doctoral Thesis