Normal Values of QT Variability in 10-s Electrocardiograms for all Ages

Corrected QT variability in serial electrocardiograms in long QT syndrome: the importance of the maximum corrected QT for risk stratification.

OBJECTIVES We evaluated the incremental prognostic information provided by multiple corrected QT (QTc) measurements on serial electrocardiograms (ECGs) in patients with the inherited long QT syndrome (LQTS). BACKGROUND A baseline QTc of > or =500 ms has been shown to be associated with increased risk of cardiac events among LQTS patients. However, the value of QTc measurements on follow-up EC...

Normal values of the electrocardiogram for ages 16-90 years.

INTRODUCTION To establish an up-to-date and comprehensive set of normal values for the clinically current measurements in the adult ECG, covering all ages for both sexes. METHODS The study population included 13,354 individuals, taken from four population studies in The Netherlands, ranging in age from 16 to 90 years (55% men) and cardiologically healthy by commonly accepted criteria. Standar...

Diagnostic accuracy of screening electrocardiograms in long QT syndrome I.

OBJECTIVE Inherited long QT syndrome (LQTS) may present with syncope, seizures, and/or sudden death as a result of ventricular tachyarrhythmias. Identification of family members who are at risk because they harbor the genetic substrate for LQTS is critical. Presently, such identification relies on the 12-lead electrocardiogram (ECG). The purpose of this study was to evaluate the efficacy of the...

QT Interval and QT Variability

study of cohesive devices in the textbook of english for the students of apsychology by rastegarpour

this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...