Resumen Referencia del documento de práctica clínica basada en la evidencia: Driscoll, A., Grant, M. J., Carroll, D., Dalton, S., Deaton, C., Jones, I., Astin, F. (2018). EUROPEAN SOCIETY OF CARDIOLOGY ® The effect of nurse-to-patient ratios on nurse-sensitive patient outcomes in acute specialist units: a systematic review and meta-analysis. European Journal of Cardiovascular Nursing, 17(1): 6–22. https:// doi.org/10.1177/1474515117721561