Quantification of left ventricular longitudinal strain, strain rate, velocity, and displacement in healthy horses by 2-dimensional speckle tracking.
J Vet Intern Med
; 25(2): 330-8, 2011.
Article
en En
| MEDLINE
| ID: mdl-21382074
ABSTRACT
BACKGROUND:
The quantification of equine left ventricular (LV) function is generally limited to short-axis M-mode measurements. However, LV deformation is 3-dimensional (3D) and consists of longitudinal shortening, circumferential shortening, and radial thickening. In human medicine, longitudinal motion is the best marker of subtle myocardial dysfunction.OBJECTIVES:
To evaluate the feasibility and reliability of 2-dimensional speckle tracking (2DST) for quantifying equine LV longitudinal function. ANIMALS Ten healthy untrained trotter horses; 9.6 ± 4.4 years; 509 ± 58 kg.METHODS:
Prospective study. Repeated echocardiographic examinations were performed by 2 observers from a modified 4-chamber view. Global, segmental, and averaged peak values and timing of longitudinal strain (SL), strain rate (SrL), velocity (VL), and displacement (DL) were measured in 4 LV wall segments. The inter- and intraobserver within- and between-day variability was assessed by calculating the coefficients of variation for repeated measurements.RESULTS:
2DST analysis was feasible in each exam. The variability of peak systolic values and peak timing was low to moderate, whereas peak diastolic values showed a higher variability. Significant segmental differences were demonstrated. DL and VL presented a prominent base-to-midwall gradient. SL and SrL values were similar in all segments except the basal septal segment, which showed a significantly lower peak SL occurring about 60 ms later compared with the other segments. CONCLUSIONS AND CLINICAL IMPORTANCE 2DST is a reliable technique for measuring systolic LV longitudinal motion in healthy horses. This study provides preliminary reference values, which can be used when evaluating the technique in a clinical setting.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ecocardiografía
/
Función Ventricular Izquierda
/
Disfunción Ventricular Izquierda
/
Enfermedades de los Caballos
/
Caballos
Tipo de estudio:
Diagnostic_studies
/
Observational_studies
Límite:
Animals
Idioma:
En
Revista:
J Vet Intern Med
Asunto de la revista:
MEDICINA INTERNA
/
MEDICINA VETERINARIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Bélgica