View clinical trials related to Qt Interval, Variation in.
Filter by:The QT interval is a measure of the combination of cardiac depolarization and repolarization as it encompasses both the QRS complex and the J-T interval. QT, QTc, QTd prolongation or shortening has been associated with ventricular arrhythmias . In order to define non-torsogenic drug-induced arrhythmias, the index of cardio-electrophysiological balance (iCEB), which is a new marker calculated with the QT/QRS formula, has been defined. In our study, we planned to evaluate the effects of dexmedetomidine and propofol on cardiac electrophysiology with all these parameters, especially the newly defined iCEB.
The LINQ QT Study is a prospective, non-randomized, multi-center, observational, post-market clinical study investigating QT interval changes due to antiarrhythmic drug loading.
This is a Phase 1, single-center, randomized, partially double-blind, placebo- and positive controlled, 4-way crossover study to evaluate the effect of a therapeutic and a supratherapeutic dose of LC350189 on the QTcF in healthy male and female subjects.
Randomized controlled trial of acute use of electronic cigarette or tobacco cigarette on parameters of ventricular repolarization and inflammation/oxidative stress.
BACKGROUND AND RATIONALE: There is very limited literature available on the arrhythmia occurrence in the context of an infection by the SARS-CoV2 virus. On the other hand, treatment strategies against the SARS-CoV2 virus may carry a risk of QTc prolongation and pro-arrhythmia/sudden death which may be amplified by concomitant use of other QTc-prolonging drugs and/or ion disbalances. COVIDAR is an international initiative to monitor the occurrence of arrhythmic events in the context of the SARS-CoV2 infection, to identify potential modifiable predisposing factors to reduce their incidence and to inform the best arrhythmia management options in this patient population. MAIN OBJECTIVE: To describe the incidence and type of arrhythmic events in the context of the SARS-CoV2 infection. STUDY DESIGN: patient registry (observational). Patients will not undergo any additional investigations. Only data that is generated during routine clinical care will be collected. STUDY POPULATION: Patients admitted to the hospital highly suspected of or with confirmed COVID-19.
Long QT syndrome (LQTS) is an inherited heart defect where the heart takes longer to recover between beats. LQTS is a known condition predisposing young footballers to sudden cardiac death (SDC). The existence of LQTS can be established by measuring the QT interval in an electrocardiogram (ECG). Currently pre-participation cardiac screening is performed in young athletes but players may only be screened at 16 years old using only a resting ECG, and a medical check including a questionnaire on family and medical history. However, the sensitivity and specificity of the screening to investigate underlying causes of SCD could be improved with the addition of an exercise stress test or cardiopulmonary exercise test (CPET). Certain abnormalities in the heart may only become apparent when the heart has been stressed (e.g. via exercise). This is particularly important as in young athletes these abnormal rhythms manifest during rest and recovery rather than at peak exercise. The CPET measures changes in the ECG in response to exercise that increases in intensity in a continuous manner until the participant cannot exercise any long. However, football is characterised by high- intensity bouts of exercise interspersed with low-intensity bouts or pauses. Therefore, the continuous test does not reflect the movement patterns of football and may not stress the cardiovascular system in a similar manner. To address this, intermittent graded exercise tests have been developed to reflect the intermittent movement pattern. As yet there is limited evidence on whether there are any differences in ECG changes during intermittent exercise. Specifically, it is not clear how an intermittent movement pattern might affect the QT interval.
Torsade de pointes (TdP) is a cardiac arrhythmia associated with QT interval prolongation which may lead to cardiac arrest. Prescription medications which cause QT interval prolongation are commonly used in daily practice. To lessen risk of TdP, pharmacists work to minimize combinations of QT interval prolonging drugs. If community pharmacists had real-time information about a patient's QT interval duration, this would have the direct ability to inform their decision making about which patients may be at highest risk of TdP and who may need heightened avoidance of QT prolonging drugs. This project will provide 3 community pharmacies with mobile ECG devices to easily determine QT intervals among patients who have a prescription profile alert for QT interval prolongation. Study outcomes will include: frequency of QT interval prolongation, changes in drug therapy related to QT interval determination, and patient and pharmacist satisfaction with having pharmacist assessment of QT interval.
This study is conducted to evaluate effect on QT/QTc Interval after multiple dose of celecoxib among healthy adult volunteers. It is randomized, open-label, negative and postive control, and crossover study. Volunteers will be mainly checked up through ECG to find out changes of QT/QTc interval during the study.
Studies have shown that the risk of developing heart arrhythmias, is increased in patients receiving medication for Attention-deficit hyperactivity disorder (ADHD) and depression. The QT-interval on a electrocardiogram (ECG) is often used to assess the patients risk of developing heart arrhythmias. The QT-interval defines the hearts electrical resting period and a long interval is linked to an increased risk of developing heart arrhythmias. In this project the investigators wish to examine possible side-effects in patients receiving medication for ADHD and depression and their dynamic QT-interval changes, by analysing the ECG changes that occur during "Brisk Standing".
A study to assess the QTc prolongation effect of NPC-15 (melatonin 8mg or 16mg)