Long QT Syndrome


The "QT" in "long QT" stands for the interval in an echocardiograph (or ECG) that represents the ventricles of the heart completing their contraction (the "lub" in the "lub dub" of the heartbeat), recovering, and preparing for the next contraction. An abnormally long QT means the ventricles may end up out of sync with the rest of the heart.

  • Signs and symptoms

    Signs include sudden collapse, seizures, and sometimes death

    First signs of this disease are often in adulthood.

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  • Diagnosis

    Genetic testing and ECG monitoring can be used to diagnose this disease.

  • Treatment

    Fortunately, there are medications that can be given to affected dogs to help control the electrical pace of the heart.

  • What to do if your dog is at risk


    • Carefully following your veterinarian's advice and regular cardiac screenings will help to give your dog the most normal life possible.

  • Genetic Information

    In the English Springer Spaniel, LQTS has been mapped to a mutation in the KCNQ1 gene.

    All affected dogs were heterozygous (had only one copy) of the mutation.

    Gene names:

    KCNQ1 ‐ chr

    Inheritance type:


  • Breeds affected

    This health condition affects the following breeds

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