Active clinical trials for "Long QT Syndrome"

Long QT Syndrome (LQTS) is a disease of young adults and can affect women of child bearing age. Suffers of LQTS are at risk of ventricular dysrhythmias including torsades de pointes and ventricular fibrillation. Pregnancy increases the chance that any mother may have an abnormal heart rhythm or arrhythmia. This chance is higher with the LQTS. There are only a few reported cases of women with the LQTS having a baby in the medical literature. This can make it difficult for the doctor caring for a pregnant woman with the long QT syndrome - especially should they need an anesthetic. We would like to study as many women who have had a baby who have the long QT syndrome to give us a better idea of whether there are any arrhythmias occurring at the time of delivery.

The purpose of this study is to collect surface electrograms from standard and several non-standard configurations in patients with long QT syndrome, heart failure, cardiac resynchronization therapy or wide QRS during a routine outpatient assessment. The ECGs collected will be used as test signals by the sponsor for the development of a subcutaneous implantable defibrillator

To screen by electrocardiography the entire population of 1,400 individuals in seven Amish Mennonite communities in order to perform genetic linkage studies of long QT syndrome (LQTS).

Observational study in 6 psychiatric hospitals in Flanders. Patients are included when a QT-prolonging drug is added to a medication profile that already contains a potential QT-prolonging drug. An ECG is taken before the administration of the new drug and a week after starting the new drug to investigate the change in duration of the QTc-interval. Risk factors for developing QT-prolongation and blood concentrations of potassium and creatinine are documented.

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".

Experimental intervention: electrocardiography. Control intervention: none Duration of intervention per patient/subject: 5 min, observation 6 months Key inclusion criteria: outpatients after lung transplantation (single, double or combined) outpatients on the wait list for lung transplantation Key exclusion criteria: • no informed consent

On 04/30/2015, ANSM (the National Security Agency of Medicines and Health Products) shared an information for general practicioners, pediatricians, anesthesiologists, dermatologists, geriatricians, psychiatrists, community pharmacists and hospital about using hydroxyzine and the associated risk of QT prolongation on the electrocardiogram. Drugs containing hydroxyzine (the best known and most used is the Atarax®) are used in France in various indications including the treatment of minor manifestations of anxiety, premedication with general anesthesia and the symptomatic treatment of urticaria. A prolonged QT interval is a known risk factor for occurrence of torsades de pointes which can cause sudden death. We distinguish congenital and acquired long QT interval. The main cause of acquired long QT interval is a drug inhibition of the HERG potassium channel 1. Many drugs have been reported to cause sudden death by prolongation of QT interval and occurrence of torsades de pointes (macrolides, anti -arythmics, some psychotropic ...) The molecules based on hydroxyzine are known to be at risk of prolongation of QT interval in an experimental point of view but is not clearly identified in daily clinical practice. Pharmacology unit of Caen was the first to publish a case of QT prolongation under hydroxyzine . Through this publication, associated with other clinical data, hydroxyzine has been added to the list of drugs that can induce QT prolongation . Despite these recent recommendations, it does not seem that hydroxyzine prescriptions were changed daily and therefore the risk of QT prolongation persists. We therefore propose the study of the impact of hydroxyzine on the QT interval measured on the electrocardiogram in patients hospitalized at the University Hospital of Caen.

.Cardiac affection in liver cirrhosis is a clinical condition characterized by impaired diastolic relaxation and contractility with electrophysiological abnormalities. .Cirrhotic patients with cardiac abnormality have higher mortality rates compared to patients without cardiac affection. The suggested pathophysiologic mechanisms of cardiac affection in cirrhotic patients are; alterations in the beta-adrenergic signaling pathway and, myocardial fibrosis formation, sympathetic nervous system activation and changes in ion channels. .As a component of cardiac involvement in cirrhotic patients fragmented QRS complex and prolongation of the corrected QT interval has been documented in most of the cases with liver cirrhosis (LC) and its prevalence increases with the severity of the disease

High-resolution, non-invasive electromechanical mapping in genotyped long-QT syndrome patients and healthy controls at baseline and during smart provocation.

Loss-of-function mutations in voltage-gated potassium channels cause long QT syndrome (LQTS) due to a prolonged cardiac repolarisation phase. Hypoteses: patients with loss-of-function mutations also exhibit altered hormone release upon glucose ingestion.