What family member testing should be included in the workup of long QT syndrome (LQTS)?

Updated: Nov 29, 2017
  • Author: Ali A Sovari, MD, FACP, FACC; Chief Editor: Mikhael F El-Chami, MD  more...
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It is important to review the ECGs of family members of a patient with LQTS, to obtain detailed histories, and to perform physical examinations. However, an absence of ECG findings of LQTS in family members does not exclude LQTS. In the ideal setting, all family members should be tested for LQTS mutations to help limit the small, but definite, risk of arrhythmia and sudden cardiac death. Testing is especially relevant if the patient was exposed to a drug that prolongs the QT interval.

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