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      Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
    • Med treatment and moreTreatment
    • Suggested protocolsAlgorithm

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    Attention COACH STUDY participants:

    The principal investigators of the study request that you use the official version of the modified score here.

    Corrected QT Interval (QTc)

    Corrects the QT interval for heart rate extremes (choose from Bazett, Fridericia, Framingham, or Hodges formulas).

    IMPORTANT

    We launched a COVID-19 Resource Center, including a critical review of recommended calcs.

    When to Use
    Why Use
    • Patients with syncope.
    • Patients receiving multiple QT-prolonging medicines.
    • A prolonged QT interval is associated with an increased risk of torsade de pointes.
    • The QT shortens at faster heart rates; this calculator corrects the QT to the QT at a heart rate of 60.
    • The QT lengthens at slower heart rates; this calculator corrects the QT to the QT at a heart rate of 60.
    Bazett
    Fridericia
    Framingham
    Hodges
    beats/min
    25
    50
    small boxes

    Confirmed positive
    Suspected
    Unlikely
    Confirmed negative

    Result:

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    Next Steps
    Evidence
    Creator Insights
    Dr. Alex Sagie

    About the Creator

    Alex Saige, MD, is a cardiologist at the Edith Wolfson Medical Center in Israel. Previously, he was a researcher for the Framingham Heart Study in Boston, Massachusetts. Dr. Saige’s primary research is focused on heart valve diseases and transesophageal echocardiography.

    To view Dr. Alex Sagie's publications, visit PubMed

    Are you Dr. Alex Sagie? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    Dr. Louis S. Fridericia

    About the Creator

    Louis S. Fridericia, MD, (d. 1947) was a professor of hygiene at the Hygienic Institute of the University of Copenhagen in Denmark. He was also the president of the Medical Society of Copenhagen. Dr. Fridericia’s primary research was focused on duration of systole in an electrocardiogram in heart disease.

    To view Dr. Louis S. Fridericia's publications, visit PubMed

    Are you Dr. Louis S. Fridericia? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    Dr. Henry Cuthbert Bazett

    About the Creator

    Henry Cuthbert Bazett, MD, (d. 1950) was the head of the Department of Physiology at the University of Pennsylvania and was a leader of the American Society of Physiology. He served in the British Medical Corps in World War I. Dr. Bazett is best known for his work with electrocardiogram interpretation and contributed greatly to the study of circulation in humans by using invasive catheterization.

    To view Dr. Henry Cuthbert Bazett's publications, visit PubMed

    Are you Dr. Henry Cuthbert Bazett? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    About the Creator
    Dr. Alex Sagie
    Are you Dr. Alex Sagie?
    Dr. Louis S. Fridericia
    Are you Dr. Louis S. Fridericia?
    Dr. Henry Cuthbert Bazett
    Are you Dr. Henry Cuthbert Bazett?