Results 291 to 300 of about 182,594 (345)
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The American Journal of Emergency Medicine, 2008
A 21-year-old woman, without medical history, was admitted after cardiac arrest. Cardiopulmonary resuscitation and use of semiautomatic defibrillator quickly restored sinus rhythm. Clinical examination was normal with no cardiac murmur or abnormal heart sound. Electrocardiogram revealed sinus rhythm with short QT interval.
Jérôme, Fichet +3 more
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A 21-year-old woman, without medical history, was admitted after cardiac arrest. Cardiopulmonary resuscitation and use of semiautomatic defibrillator quickly restored sinus rhythm. Clinical examination was normal with no cardiac murmur or abnormal heart sound. Electrocardiogram revealed sinus rhythm with short QT interval.
Jérôme, Fichet +3 more
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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 ...
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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 ...
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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
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Hypocalcemia-Induced QT Interval Prolongation
Cardiology, 2022An 87-year-old man with a history of transcatheter aortic valve replacement, pulmonary hypertension, diastolic dysfunction with preserved systolic function, and myelofibrosis had a 12-lead ECG showed a prolonged QT interval of 508 ms with heart-rate correction placing it in the 99th percentile of the population.
Jacky K.K. Tang, Simon W. Rabkin
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Prolonged QT-Interval Syndromes
JAMA: The Journal of the American Medical Association, 1986PROLONGATION of the QT interval, either on a congenital or an acquired basis, is associated with an increased likelihood of malignant ventricular arrhythmias. 1-3 Patients with QT prolongation frequently develop recurrent attacks of syncope or may present with sudden death.
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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.
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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.
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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.
Ihor Gussak +3 more
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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.
Ihor Gussak +3 more
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Ceskoslovenska fysiologie, 2001
Dispersion of QT intervals has been proposed as a measure of repolarization process inhomogeneity (and thus refractority inhomogeneity) of ventricular myocardium. Recently other possible explanation of this phenomenon has been intensively discussed.
O, Kittnar, M, Lechmanová
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Dispersion of QT intervals has been proposed as a measure of repolarization process inhomogeneity (and thus refractority inhomogeneity) of ventricular myocardium. Recently other possible explanation of this phenomenon has been intensively discussed.
O, Kittnar, M, Lechmanová
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Social determinants of health and US cancer screening interventions: A systematic review
Ca-A Cancer Journal for Clinicians, 2023Ariella R Korn
exaly