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

    Disease

    Select...

    Specialty

    Select...

    Chief Complaint

    Select...

    Organ System

    Select...

    Patent Pending

    Corrected QT Interval (QTc)

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

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights

    Advice

    Consider common etiologies for prolonged QT interval, including:

    • Electrolyte abnormalities.
    • Intrinsic cardiac causes.
    • Central causes.
    • Medications.

    See also Facts & Figures.

    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?