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Dynamics of the uncorrected QT interval during vagal-induced lengthening of RR intervals

      It is well known that within the physiologic ranges of heart rate as well as during controlled exercise, the uncorrected QT interval shortens as the RR interval decreases (or as the heart rate increases).
      • Malik M.
      • Camm A.J.
      Correct the QT interval correctly should QTc be expressed in the same units as the QT interval?.
      ,
      • Bazett H.C.
      An analysis of the time relationship of electrocardiograms.
      ,
      • Kligfield P.
      • Kevin G.L.
      • Okin P.M.
      QT interval heart-rate relation during exercise in normal men and women definition by linear regression analysis.
      ,
      • Moleiro F.
      • Misticchio F.
      • Torres J.M.
      • Pulido M.
      • Luque M.
      • Rodriguez A.
      • Mendoza I.
      • Guerrero J.
      • Ruesta V.
      • Castellanos A.
      • Myerburg R.J.
      Paradoxical behavior of the QT interval during exercise and recovery and its relationship with cardiac memory.
      ,
      • Takahashi N.
      • Ito M.
      • Ishida S.
      • Nakagawa M.
      • Hara M.
      • Saikawa T.
      • Sakata T.
      Paradoxically shortened QT interval after a prolonged pause.
      However, few articles have dealt with the dynamic response of QT to sudden vagal-induced increases in the RR interval occurring in subjects without demonstrable structural heart disease.
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