Results 161 to 170 of about 133,758 (181)
Some of the next articles are maybe not open access.
Contourographic QT interval measurement
Journal of Electrocardiology, 1983A new presentation of ECG tracings is presented (contourography) which is suitable for ECG intervals measurements, particularly QT for prolonged periods of time. Possible applications of this method are looked for in the future.
J. Torresani +3 more
openaire +4 more sources
Syncope With Prolonged QT Interval
Archives of Pediatrics & Adolescent Medicine, 1976Four children with syncope had a prolonged QT interval on the electrocardiogram. Neurologic studies were negative. One patient had associated deaf mutism, one had a family history of sudden death and prolonged QT interval, and two had ventricular arrhythmias while being monitored in the hospital.
John P. Frank, David Z. Friedberg
openaire +3 more sources
QT Interval and QT Dispersion in Eating Disorders
Psychotherapy and Psychosomatics, 2004<i>Background:</i> Eating disorders are thought to be risk factors for cardiac sudden death secondary to arrhythmia. Results in previous studies on QT interval and QT dispersion, markers of fatal arrhythmia, have been inconsistent. <i>Methods:</i> We prospectively examined 179 female eating disorder patients, being over 18 years
Yuzo Nagakawa +7 more
openaire +3 more sources
THE QT INTERVAL AND CARDIAC ARRHYTHMIAS
Annual Review of Medicine, 1987The relation between the QT interval, ventricular arrhythmias, and dispersion of ventricular repolarization is reviewed. Conditions associated with prolonged QT interval in clinical practice are listed and discussed briefly. There is no conclusive evidence that prolonged QT is an independent prognostic marker in patients with coronary and other types ...
openaire +3 more sources
, 2003 Although many factors influence the duration of ventricular repolarization and the detailed appearance of ECG (Table 1), regional differences in the configuration of action potentials across the myocardial wall are considered to be major determinants of the three-dimensional pattern of ECG waves and intervals.
Daniel Goodman +3 more
openaire +1 more source
1989
The QT interval of the electrocardiogram (ECG) is measured from the onset of ventricular activity to the end of the T wave. Because the QT interval varies with heart rate in normal individuals a “corrected” QT interval is sometimes calculated to factor out heart rate-dependent effects to provide a measure that is independent of rate effects.
openaire +2 more sources
The QT interval of the electrocardiogram (ECG) is measured from the onset of ventricular activity to the end of the T wave. Because the QT interval varies with heart rate in normal individuals a “corrected” QT interval is sometimes calculated to factor out heart rate-dependent effects to provide a measure that is independent of rate effects.
openaire +2 more sources
Polypharmacy and the QT interval
British Journal of Cardiac Nursing, 2006A mini-systematic review was carried out to examine the evidence base of the effect of multiple drug administration (polypharmacy) on the QT interval in healthy humans. Prolongation of the electrocardiograph QT interval may lead to fatal cardiac arrhythmias and this may be induced by multiple drug administration.
openaire +2 more sources
Effect of respiration on the QT interval
Journal of Electrocardiology, 1994This clinical study was undertaken to investigate the effect of respiration on the QT interval. The QT interval is affected by a variety of factors, including steady changes in heart rate, instantaneous changes in heart rate as in atrial fibrillation, and changes in autonomic tone.
Sudha M. Pai, Ramdas G. Pai, John Rawles
openaire +3 more sources
Cardiac electrophysiology review, 2002
The QT interval, which represents duration of ventricular electrical systole, i.e., the time required for completion of both ventricular depolarization and repolarization, has been a parameter of particular interest in cardiology. However, the relationship between duration of cellular action potentials and the QT interval recorded at the body surface ...
openaire +3 more sources
The QT interval, which represents duration of ventricular electrical systole, i.e., the time required for completion of both ventricular depolarization and repolarization, has been a parameter of particular interest in cardiology. However, the relationship between duration of cellular action potentials and the QT interval recorded at the body surface ...
openaire +3 more sources