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Incorrectly corrected? QT interval analysis in rats and mice.

Wesam Mulla1,2, Michael Murninkas1,2, Or Levi1,2

  • 1Cardiac Arrhythmia Research Laboratory, Department of Physiology and Cell Biology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

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Summary

Correcting the QT interval in rodents for heart rate is complex. Existing formulas may lead to errors, as rodent heart rate adaptation differs significantly from humans.

Keywords:
ECGQT intervalaction potential durationeffective refractory periodrate-adaptationrodent cardiac electrophysiology

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Area of Science:

  • Cardiology
  • Pharmacology
  • Physiology

Background:

  • The QT interval in ECG reflects ventricular action potential duration (APD).
  • QT interval is crucial for assessing cardiac abnormalities and drug safety.
  • Heart rate (HR) significantly impacts QT interval, necessitating corrected formulas (QTc) in humans.

Purpose of the Study:

  • To review the challenges in correcting the QT interval for heart rate in small mammals.
  • To discuss the limitations of existing empiric correction formulas for rodents.
  • To highlight recent findings on rodent rate-adaptation properties.

Main Methods:

  • Review of experimental findings from pharmacological and direct pacing studies.
  • Analysis of data from unanesthetized rodents.
  • Comparison of rodent and human cardiac rate-adaptation properties.

Main Results:

  • Rodent cardiac APD and QT interval exhibit distinct rate-adaptation properties compared to humans.
  • Existing QTc correction formulas used in rodents can lead to significant data interpretation errors.
  • Empiric correction formulas developed for rats and mice may not be universally applicable.

Conclusions:

  • The established methods for correcting the QT interval for heart rate in humans are not directly applicable to rodents.
  • Further research is needed to develop accurate QT interval correction methods for small mammals.
  • Accurate QTc correction in rodents is essential for reliable preclinical safety assessments.