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* This is the Consumer Version. *

Cardiac Channelopathies

By L. Brent Mitchell, MD, Libin Cardiovascular Institute of Alberta

Cardiac channelopathies are genetic abnormalities in heart cell proteins that control heart electrical activity and thus can cause heart rhythm disturbances.

Most people who have cardiac channelopathies have no other heart disease, such as a heart attack or a heart valve disorder, but they carry mutations in the genes that determine the make-up or the regulation of heart membrane pores (channels) and are predisposed to heart rhythm abnormalities. The most common channelopathies cause

Other, more rare cardiac channelopathies include the following:

  • Short QT syndrome

  • J-wave syndrome

  • Catecholaminergic polymorphic ventricular tachycardia (CPVT)

  • Brugada syndrome

The electrical defects sometimes cause ventricular tachycardia or ventricular fibrillation.

Symptoms

Some people never have any symptoms, but many people have fainting because of ventricular tachycardia. Those who have ventricular fibrillation have sudden cardiac arrest. Symptoms may be triggered by fever or treatment with some drugs, including some antiarrhythmic drugs and some antidepressants.

Diagnosis

  • Electrocardiography

Electrocardiography (ECG) is used to make the diagnosis. But sometimes the pattern of ECG abnormalities is less clear. In such cases, doctors may try to provoke the heart rhythm disturbance with a drug or with exercise, enabling doctors to make a diagnosis.

Treatment

  • Implantable cardioverter-defibrillator

Usually, an implantable cardioverter-defibrillator (ICD), a small device that can detect an arrhythmia and deliver a shock to correct it, is used. This procedure is similar to implantation of an artificial pacemaker.

* This is the Consumer Version. *