Papers

Peer-reviewed
6 2013

Influence of heart rate on myocardial function using two-dimensional speckle-tracking echocardiography in healthy dogs

JOURNAL OF VETERINARY CARDIOLOGY
  • Ryohei Suzuki
  • ,
  • Hirotaka Matsumoto
  • ,
  • Takahiro Teshima
  • ,
  • Hidekazu Koyama

Volume
15
Number
2
First page
139
Last page
146
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1016/j.jvc.2012.12.004
Publisher
ELSEVIER SCIENCE BV

Objective: The objective of this study was to evaluate the influence of heart rate (HR) on myocardial function assessed by two-dimensional speckle-tracking echocardiography (2D-STE) in healthy dogs.
Animals: Thirteen healthy beagle dogs.
Methods: Animals were anesthetized and HR was controlled with right atrial pacing. Myocardial function of each dog was assessed using 2D-STE at pacing rates of 120, 140, 160, and 180 bpm.
Results: All strain and strain rate variables in the longitudinal, circumferential, and radial directions were not significantly different between pacing rates. Peak early diastolic torsion rate at 180 bpm was significantly increased compared with that at 120 bpm (P = 0.003).
Conclusion: Torsion rate in early diastole was elevated at 180 bpm, which may reflect improved myocardial relaxation with higher HR. Changes in left ventricular torsion during tachycardia may play an important role in preserving stroke volume in the presence of shortened ejection and filling times. (C) 2013 Elsevier B.V. All rights reserved.

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Link information
DOI
https://doi.org/10.1016/j.jvc.2012.12.004
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/23643819
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000334968100005&DestApp=WOS_CPL

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