Clinical validity of the quantitative gait variables in patients with multiple sclerosis. A comparison of the Timed 25-foot Walk Test and the GAITRite ® Electronic Walkway system
*Correspondencia: Beatriz Heredia Camacho. Unidad de Esclerosis Múltiple. Hospital Universitario Virgen Macarena. Avda. Doctor Fedriani, 3. E-41071 Sevilla.
E-mail: beatriz.heredia@neuroinvest.net
INTRODUCTION. Multiple sclerosis is an inflammatory and degenerative disease in which gait alteration is one of the first symptoms. Its quantitative evaluation is often made by the Timed 25-foot Walk Test (T25FW), although it's limited to know only the distance, the time employed and number of steps.
AIM. To compare the T25FW with the results from the GAITRite ® Electronic Walkway system (GEW), to know if there is some variability between them.
PATIENTS AND METHODS. The sample consisted in 85 subjects with multiple sclerosis and able to walking, with or without aids (EDSS: 1.0-6.5). Four walkings were made along the 8 m-length carpet from GEW system, while a different evaluator measured the time employed with a chronometer, and the number of steps in a 25 feet distance marked side by side in the carpet. Velocity was calculated in function of distance and time employed. A mean from the four walkings was made and both of the measures were correlated with SPSS v. 18, considering a results of p < 0.001, statistically significant.
RESULTS. Time employed (p = 1.000), velocity (p = 0.9995), cadence (p = 0.3296) and number of steps (p = 1.000) were not statistically different.
CONCLUSIONS. GEW system has the same clinical validity in gait evaluation in multiple sclerosis patients than the T25FW.
Objetivo Comparar el T25FW con el resultado del sistema GEW para establecer si hay variabilidad entre ambos.
Pacientes y métodos La muestra constaba de 85 sujetos con esclerosis múltiple y capaces de deambular, con o sin ayuda (EDSS: 1,0-6,5). Se realizaron cuatro pases por el tapiz electrónico de 8 m de longitud, del sistema GEW, que calcula distintos parámetros espaciotemporales, a la vez que otro evaluador hacía una medición con cronómetro del tiempo empleado y el número de pasos dados en una distancia de 25 pies marcada lateralmente en el mismo tapiz. La velocidad se calculó en función del tiempo empleado en recorrer los 25 pies. Se hizo una media de los cuatro pases de ambas mediciones y se correlacionó con el programa SPSS v. 18, considerando estadísticamente significativa una p < 0,001.
Resultados Ni el tiempo empleado (p = 1,000), ni la velocidad (p = 0,9995), ni la cadencia (p = 0,3296) ni el número de pasos (p = 1,000) mostraron diferencias estadísticamente significativas.
Conclusiones El sistema GEW tiene la misma validez clínica en la evaluación de la marcha en pacientes con esclerosis múltiple que el T25FW.