1. Berger, R. D., Kasper, E. K., Baughman, K. L., Marban, E., Calkins, H. and Tomaselli, G. F. Beat-to-beat QT interval variability: novel evidence for repolarization lability in ischemic and nonischemic dilated cardiomyopathy. Circulation, 1997, 96, 1557–1565.
2. Hinterseer, M., Thomsen, M. B., Beckmann, B. M., Pfeufer, A., Schimpf, R., Wichmann, H. E., Steinbeck, G. and Kaab, S. J. Beat-to-beat variability of QT intervals is increased in patients with drug-induced long-QT syndrome: a case control pilot study. Eur. Heart J., 2008, 29, 185–190.
doi:10.1093/eurheartj/ehm586
3. Piccirillo, G., Magri, D., Matera, S., Magnanti, M., Torrini, A., Pasquazzi, E., Schifano, E., Velitti, S., Mariglieno, V., Quaglione, R. and Barillà, F. QT variability strongly predicts sudden cardiac death in asymptomatic subjects with mild or moderate left ventricular systolic dysfunction: a prospective study. Eur. Heart J., 2007, 28, 1344–1350.
doi:10.1093/eurheartj/ehl367
4. Haigney, M. C., Zareba, W., Gentlesk, P. J., Goldstein, R. E., Illovski, M., McNitt, S., Andrews, M. L. and Moss, A. J. QT interval variability and spontaneous ventricular tachycardia or fibrillation in MADIT II patients. J. Am. Coll. Cardiol., 2004, 44, 1481–1487.
doi:10.1016/j.jacc.2004.06.063
5. Nemec, J., Buncova, M., Shusterman, V., Winter, B., Shen, W. K. and Ackerman, M. J. QT interval variability and adaptation to heart rate changes in patients with long QT syndrome. Pacing Clin. Electrophysiol. (PACE), 2009, 32, 72–81.
doi:10.1111/j.1540-8159.2009.02179.x
6. Lass, J., Kaik, J., Karai, D. and Vainu, M. Ventricular repolarization evaluation from surface ECG for identification of the patients with increased myocardial electrical instability. In Proc. 23rd Annual International Conference of the IEEE, Engineering in Medicine and Biology Society, 2001, vol. 1, 390–393.
7. Extramiana, F., Maison-Blanche, P., Badilini, F., Pinoteau, J., Deseo, T. and Coumel, P. J. Circadian modulation of QT rate dependence in healthy volunteers: Gender and age differences. J. Electrocardiol., 1999, 32, 33–43.
doi:10.1016/S0022-0736(99)90019-5
8. Malik, M., Färbom, P., Batchvarov, V., Hnatkova, K. and Camm, A. J. Relation between QT and RR intervals is highly individual among healthy subjects: implications for heart rate correction of the QT interval. Heart, 2002, 87, 220–228.
doi:10.1136/heart.87.3.220
9. Goldberger, J. J., Cain, M. E., Hohnloser, S. H., Kadish, A. H., Knight, B. P., Lauer, M. S., Maron, B. J., Page, R. L., Passman, R. S., Siscovick, D. et al. American Heart Association/ American College of Cardiology Foundation/Heart Rhythm Society Scientific Statement on Noninvasive Risk Stratification Techniques for Identifying Patients at Risk for Sudden Cardiac Death. A scientific statement from the American Heart Association Council on Clinical Cardiology Committee on Electrocardiography and Arrhythmias and Council on Epidemiology and Prevention. J. Am. Coll. Cardiol., 2008, 52, 1179–1199.
doi:10.1016/j.jacc.2008.05.003
10. Zareba, W., Badilini, F. and Moss, A. J. Automatic detection of heterogeneous repolarization. J. Electrocardiol., 1994, 27, 65–71.
doi:10.1016/S0022-0736(94)80051-0