PMID: 7546995Aug 1, 1995Paper

Relation between QT and RR intervals in patients with bradyarrhythmias

British Heart Journal
S IshidaM Ito

Abstract

To investigate the relation between QT and RR intervals in the sick sinus syndrome or high degree atrioventricular block. 32 patients with episodes of prolonged RR intervals (> or = 2.6 s) on Holter electrocardiographic recordings. QT and RR intervals were measured manually every 100 to 150 beats on electrocardiographic strips reprinted from the Holter tape over 24 hours. The slope of the QT/RR relation was determined by the linear regression equation for RR intervals < or = 1.4 s (slope 1) and > 1.4 s (slope 2). Slope 2 (0.0068 (0.0030)) was significantly lower than slope 1 (0.0824 (0.0059), P < 0.0001) in the overall patient population. Slopes 1 and 2 were significantly lower (P < 0.001) in the 23 patients with QT intervals at the preceding RR interval of 1 s (QT1s) of < 0.44 s (0.0692 (0.0053) and 0.0019 (0.0030), respectively) than in the nine patients with QT1s intervals > or = 0.44 s (0.1159 (0.0091) and 0.0194 (0.0055), respectively). Slopes 1 and 2 correlated positively with QT1s interval in all patients. The QT/RR relation was comparatively flat when the RR interval was prolonged. Patients with prolonged QT intervals showed exaggerated prolongation of the QT interval with prolonged cycle lengths when compared with pati...Continue Reading

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Citations

Feb 1, 2003·International Journal of Cardiology·Kim RajappanDesmond J Sheridan
May 5, 1998·Journal of Pharmacological and Toxicological Methods·T MatsunagaY Shibutani
Jan 15, 2005·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Koichi MizumakiHiroshi Inoue
Jul 22, 1998·Pacing and Clinical Electrophysiology : PACE·N TakahashiT Sakata
Jan 10, 2012·European Journal of Paediatric Neurology : EJPN : Official Journal of the European Paediatric Neurology Society·Zehra KarataşSevim Karaarslan
Aug 13, 2004·Pacing and Clinical Electrophysiology : PACE·Frédéric RocheJean-Claude Barthélémy
Aug 14, 2003·Pacing and Clinical Electrophysiology : PACE·Frédéric RocheJean-Claude Barthélémy
May 30, 2006·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Charlotte E LarroudeJørgen K Kanters
Jan 29, 2002·The American Journal of Medicine·Ijaz A Khan

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