Long QT Syndrome Overview

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Learn About Long QT Syndrome

What is the definition of Long QT Syndrome?
Long QT syndrome is a heart disorder characterized by rapid, irregular heartbeats caused by a signaling abnormality in the heart’s electrical system. The QT interval refers to the time it takes for the heart’s electrical system to make the ventricles of the heart contract and then recover. In long QT syndrome, there is a delay in the time it takes for the electrical system to recover between each heartbeat. This delay can cause rapid, irregular, and life-threatening ventricular contractions, also known as torsade de pointes.
What are the symptoms of Long QT Syndrome?
Some individuals with long QT syndrome may not have any symptoms. Symptoms of long QT syndrome include fainting, also called syncope, which may or may not be preceded by blurred vision, lightheadedness, palpitations, and weakness. In individuals with long QT syndrome, fainting may occur in response to being startled, excited, angry, or scared. Symptoms of long QT syndrome may also occur during sleep or when awakened suddenly. In some individuals, long QT syndrome may cause seizures. If the heart does not return to its normal rhythm after a long QT episode, cardiac arrest and sudden death may occur.
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What are the different types of Long QT Syndrome?

Common conditions include: Long QT Syndrome 1, Long QT Syndrome 2, Long QT Syndrome 3, Long QT Syndrome 5

What are the current treatments for Long QT Syndrome?
Treatment for long QT syndrome depends on the type and location. Treatment for long QT syndrome is focused on preventing irregular heartbeats, cardiac arrest, and sudden death. Treatment for long QT syndrome may include lifestyle changes, such as avoiding intense exercise; medications, such as beta blockers and mexiletine; surgery, such as left cardiac sympathetic denervation or cardioverter-defibrillator implantation.
Who are the top Long QT Syndrome Local Doctors?
Wataru Shimizu
Elite in Long QT Syndrome
Wataru Shimizu
Elite in Long QT Syndrome
Wataru Shimizu
Sendagi, JP 

Wataru Shimizu practices in Sendagi, Japan. Mr. Shimizu is rated as an Elite expert by MediFind in the treatment of Long QT Syndrome. His top areas of expertise are Ventricular Fibrillation, Long QT Syndrome, Brugada Syndrome, Cardiac Ablation, and Percutaneous Coronary Intervention (PCI).

Dan M. Roden
Elite in Long QT Syndrome
Dr. Dan M. Roden
Cardiology
Elite in Long QT Syndrome
Dr. Dan M. Roden
Cardiology

Vanderbilt University Medical Center

1301 22nd Ave S, 
Nashville, TN 
615-322-3000
Languages Spoken:
English, Czech, French
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Accepting New Patients
Offers Telehealth

Dan Roden is a Cardiologist in Nashville, Tennessee. Dr. Roden is rated as an Elite provider by MediFind in the treatment of Long QT Syndrome. His top areas of expertise are Long QT Syndrome 5, Long QT Syndrome, Jervell Lange-Nielsen Syndrome (JLNS), Cardiac Ablation, and Percutaneous Coronary Intervention (PCI). Dr. Roden is currently accepting new patients.

 
 
 
 
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Connie R. Bezzina
Elite in Long QT Syndrome
Connie R. Bezzina
Elite in Long QT Syndrome
Connie R. Bezzina
Amsterdam, NH, NL 

Connie Bezzina practices in Amsterdam, Netherlands. Ms. Bezzina is rated as an Elite expert by MediFind in the treatment of Long QT Syndrome. Her top areas of expertise are Brugada Syndrome, Long QT Syndrome, Ventricular Fibrillation, and Cardiomyopathy.

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What are the latest Long QT Syndrome Clinical Trials?
POL-CA Registry: Multicenter Observational Study of Neuromodulatory Procedures in Cardiovascular Autonomic Dysfunction Syndromes
POL-CA Registry: Multicenter Observational Study of Neuromodulatory Procedures in Cardiovascular Autonomic Dysfunction Syndromes
Enrollment Status: Recruiting
Publish Date: September 29, 2025
Intervention Type: Procedure, Behavioral, Device

Summary: The multicentre observational study POL-CA involves a wide spectrum of patients with a history of syncopy. The study recruits patients with diagnosed vasovagal syndrome, cardioinhibitory carotid sinus syndrome, symptomatic sinus bradycardia or atrioventricular block, postural orthostatic tachycardia syndrome, orthostatic hypotension, and inappropriate sinus tachycardia syndrome. This is an observa...

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Evaluation of Free-living Physical Activity and the Assessment Tools Used to Support Pharmacological Therapy Titration and Exercise Prescription in Children and Adolescents Diagnosed With Inherited Arrhythmias
Evaluation of Free-living Physical Activity and the Assessment Tools Used to Support Pharmacological Therapy Titration and Exercise Prescription in Children and Adolescents Diagnosed With Inherited Arrhythmias
Enrollment Status: Recruiting
Publish Date: May 31, 2025
Intervention Type: Other, Diagnostic test

Summary: The goal of this observational study is to evaluate exercise testing and daily physical activity in children and adolescents who are diagnosed with an inherited arrhythmia. The main question it aims to answer is: Does maximum heart rate during controlled exercise tolerance testing accurately reflect maximum heart rate and peak exercise levels during free living daily physical activity in children ...

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What are some Advocacy Organizations?
simons-heart

Simon’s Heart is a nonprofit organization dedicated to raising awareness about, and preventing deaths from, conditions that cause sudden cardiac arrest in children.