Pentti M. Rautaharju, MD, PhD.Wake Forest University School of Medicine.e-mail: penttir@bellsouth.net

  This communication is limited to three considerations: 1) QT adjustment for rate and gender; 2) Upper and lower normal limits for rate- and gender-adjusted QT; and 3) Evaluation of QT shortening and prolongation. The data in this communication is also primarily restricted to QT data in populations investigated by the author personally.     

 QT adjustment for rate and gender

    Equation [1] gives a practical common formula for QT rate- and gender adjustment in adult men and women 40 years old and older. A comparison of the display of gender-specific normal limits for