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J Vet Cardiol. 2010 Aug;12(2):111-21. doi: 10.1016/j.jvc.2010.01.002. Epub 2010 Jul 8.

Assessment of left ventricular size and function in horses using anatomical M-mode echocardiography.

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  • 1Equine Department, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057 Zurich, Switzerland.

Abstract

OBJECTIVE:

To study the applicability of anatomical M-mode (AMM) for assessment of left ventricular (LV) size and function in horses, evaluate agreement with conventional M-mode (CMM), determine reliability, and establish reference intervals for AMM measurements.

ANIMALS:

98 horses; 13.1 +/- 5.6 years; 538 +/- 78 kg.

METHODS:

Two-dimensional and M-mode recordings were analyzed retrospectively. Standard LV dimensions and indices of LV function, including time intervals, were measured in CMM and compared with AMM studies in long-axis (lx) and short-axis (sx) views.

RESULTS:

The percentages of measureable cycles were 99%, 97%, and 90% for routine LV studies in CMM(sx), AMM(sx), and AMM(lx) mode. For time intervals, >or= 93% of cycles could be measured using AMM compared to a maximum of 77% using CMM. AMM(sx) measurements agreed well with CMM(sx) measurements for LV studies; the agreement of AMM(lx) with CMM(sx) was markedly lower. The LV ejection time and the duration of electromechanical systole, but not the LV pre-ejection period and the index of myocardial performance, showed fair agreement between methods. Intraobserver and interobserver measurement variabilities were low for most variables.

CONCLUSIONS:

AMM can replace CMM for assessment of LV dimensions in horses, but is not recommended for measurement of time intervals.

Copyright (c) 2010 Elsevier B.V. All rights reserved.

PMID:
20615777
[PubMed - indexed for MEDLINE]
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