Electrocardiographic QT Interval and Mortality

QT Interval and QT Variability

QT interval variations and mortality risk: Is there any relationship?

Abnormal prolongation and shortening of the electrocardiographic QT interval duration, which occur in the hereditary forms of long and short QT syndromes, are associated with an increased risk of ventricular arrhythmias and sudden cardiac death. Even within the normal range, these altered durations are associated with an increased mortality risk in the general population. While extreme prolonga...

The Prolonged QT Interval and its Mortality Implication

The congenitally prolonged QT interval had a total mortality of 73% in one series of 203 patients.1 Unfortunately, the study group was heterogenous with regard to symptoms, QT duration and length of follow up which varied from several years to greater than ten. The average age at death was 9.3 years with the youngest being 44 days and the oldest 40 years. Since it was first described in 1957, t...

QTc Interval and QT Dispersion in Patients with Thalassemia Major: Electrocardiographic (EKG) and Echocardiographic Evaluation

BACKGROUND Doppler echocardiographic studies in patients with beta-Thalassemia Major (beta-TM) had shown different patterns of left ventricle (LV) systolic and diastolic dysfunctions. AIM This cross-sectional study was designed to study the LV systolic and diastolic function in patients with beta-TM using Pulsed Doppler (PD) Echocardiogram and assess the QTc interval and QT dispersion (QTd) o...

Electrocardiographic QT interval prolongation and risk of primary cardiac arrest in diabetic patients.

Sudden cardiac death, also known as primary cardiac arrest (PCA), is a major cause of mortality among diabetic patients and typically occurs in the setting of coronary heart disease. Because it can occur as the first clinical manifestation of coronary heart disease, identifying diabetic patients at risk of PCA remains challenging. Interrelated sequelae of diabetes, including QT prolongation and...