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Resumen Fundamento y objetivo El efecto de bata blanca (EBB) es uno de los principales sesgos que pueden modificar la medida de la presion arterial (PA) en consulta, por lo que se debe considerar para evitar errores diagnostico-terapeuticos en los pacientes hipertensos. La utilizacion de aparatos automatizados en consulta podria disminuir dicho efecto. Metodo Se disenaron 2 estudios con el objetivo de evaluar las diferencias entre la medida rutinaria en consulta y la obtenida por el aparato automatizado de medida de PA en consulta, BPTru ® , asi como su influencia en el EBB. El primero de los estudios, TRUE-ESP, incluyo pacientes normotensos e hipertensos atendidos en consultas especializadas de Cardiologia, Nefrologia, Medicina Interna, Endocrinologia y Medicina Familiar. El segundo, TRUE-HTA, incluyo pacientes hipertensos atendidos en una Unidad de HTA, protocolizada, con personal entrenado. Resultados El estudio TRUE-ESP incluyo 300 pacientes, 76% hipertensos. Se observo una diferencia significativa entre la medida clinica y la medida BPTru ® (media [DE] de PA sistolica/PA diastolica [PAS/PAD] de 9,8 [6,11]/3,4 [7,9] mmHg, p ® (media [DE] de PAS/PAD de 5,7 [3,9]/2,1 [3,5] mmHg, p Conclusiones El empleo de aparatos automatizados de medida de PA en consulta, como el BPTru ® , puede colaborar a disminuir el EBB y mejorar la precision de la medida de la PA en consulta.

White coat effect (WCE) is one of the main bias that can affect office blood pressure (BP) measurement. Therefore, it is a factor must be considered in hypertensives to avoid mistakes in diagnosis and/or treatment. Employment of automated office BP (AOBP) devices could diminish that effect.Two studies were designed with the objective of evaluating differences between routinely office and AOBP measurements. WCE was also assessed. First, the TRUE-ESP study included normotensive and hypertensive patients attending specialized consultations at Cardiology, Nephrology, Internal Medicine, Endocrinology and Family Practice. Second, the TRUE-HTA study included hypertensives attending a protocoled Hypertension Unit, with a trained staff.TRUE-ESP study included 300 patients, 76% being hypertensives. A significant difference between office BP and AOBP measurement (SBP/DBP 9.8±11.6/3.4±7.9 mmHg, P.001) was observed. Percentage of patients gathering WCE criteria was 27.7%. TRUE-HTA study included 101 hypertensive patients. A significant difference between office BP and AOBP measurement (SBP/DBP 5.7±9.3/2.1±5.3 mmHg, P.001) and activity period-ABPM (SBP/DBP 8.5±6.7/3.5±2.5 mmHg, P.001) was observed. Percentage of WCE patients was 32.1%.Use of AOBP devices can contribute to decrease WCE and to improve accuracy of office BP measurement.