Nuestros investigadores

Ana Alfonso Piérola

Publicaciones científicas más recientes (desde 2010)

Autores: Martínez, Nicolás; Alfonso, Ana; Rifón, José Juan; et al.
Revista: EUROPEAN JOURNAL OF HAEMATOLOGY
ISSN 0902-4441  Vol. 98  Nº 1  2017  págs. 38 - 43
This retrospective study evaluates the impact of rituximab on PTLD response and survival in a single-centre cohort. PTLD cases between 1984 and 2009, including heart, kidney, liver and lung transplant recipients, were included. Survival was analysed taking into account the type of PTLD (monomorphic vs. polymorphic), EBV infection status, IPI score, Ann Arbor stage and use of rituximab. Among 1335 transplanted patients, 24 developed PTLD. Median age was 54 yr (range 29-69), median time to diagnosis 50 months (range 0-100). PTLD type was predominantly late/monomorphic (79% and 75%), mostly diffuse large B-cell type. Overall response rate (ORR) was 62% (66% rituximab vs. 50% non-rituximab; P = 0.5). R-CHOP-like regimens were used most frequently (72% of patients treated with rituximab). Median overall survival was 64 months (CI 95% 31-96). OS was significantly increased in patients treated with rituximab (P = 0.01; CI 95% rituximab 58-79 months; non-rituximab 1-30 months). Post-transplant immunosuppression regimen had no effect on survival or time to PTLD, except for cyclosporine A (CyA), which associated with increased time to PTLD (P = 0.02). Rituximab was associated with increased survival in our single-centre series, and it should be considered as first-line therapy for PTLD patients. The possible protective effect of CyA for development of PTLD should be prospectively evaluated.
Autores: Martínez, Nicolás; Alfonso, Ana; et al.
Revista: MEDICINA INTENSIVA
ISSN 0210-5691  Vol. 40  Nº 9  2016  págs. 550 - 559
Objective: To audit the impact upon mortality of a massive bleeding management protocol (MBP) implemented in our center since 2007. Design: A retrospective, single-center study was carried out. Patients transfused after MBP implementation (2007-2012, Group 2) were compared with a historical cohort (2005-2006, Group 1). Background: Massive bleeding is associated to high mortality rates. Available MBPs are designed for trauma patients, whereas specific recommendations in the medical/surgical settings are scarce. Patients: After excluding patients who died shortly (<6 h) after MBP activation (n=20), a total of 304 were included in the data analysis (68% males, 87% surgical). Interventions: Our MBP featured goal-directed transfusion with early use of adjuvant hemostatic medications. Variables of interest: Primary endpoints were 24-h and 30-day mortality. Fresh frozen plasma to-red blood cells (FFP:RBC) and platelet-to-RBC (PLT:RBC) transfusion ratios, time to first FFP unit and the proactive MBP triggering rate were secondary endpoints. Results: After MBP implementation (Group 2; n=222), RBC use remained stable, whereas FFP and hemostatic agents increased, when compared with Group 1 (n=82). Increased FFP:RBC ratio (p = 0.053) and earlier administration of FFP (p = 0.001) were also observed, especially with proactive MBP triggering. Group 2 patients presented lower rates of 24-h (0.5% vs. 7.3%; p = 0.002) and 30-day mortality (15.9% vs. 30.2%; p = 0.018) - the greatest reduction corresponding to non-surgical patients. Logistic regression showed an independent protective effect of MBP implementation upon 30-day mortality (OR = 0.3; 95% CI 0.15-0.61). Conclusions: These data suggest that the implementation of a goal-directed MBP for prompt and aggressive management of non-trauma, massive bleeding patients is associated to reduced 24-h and 30-day mortality rates. (C) 2016 Elsevier Espana, S.L.U. y SEMICYUC. All rights reserved.
Autores: Alfonso, Ana; García-Mouriz A; et al.
Revista: THROMBOSIS RESEARCH
ISSN 0049-3848  Vol. 136  Nº 6  2015  págs. 1145-1148
Although the type of malignancy appears as the most relevant variable for decision-making, additional efforts are required to identify patients at particular high thrombosis risk.
Autores: Ezponda, A; Alfonso, Ana; Iribarren, María Josefa; et al.
Revista: REVISTA ESPAÑOLA DE CARDIOLOGIA
ISSN 0300-8932  Vol. 68  Nº 7  2015  págs. 638-640
Nuestra experiencia indica que, para los pacientes con asistencia ventricular que sufran TIH sin trombosis asociada, en ausencia de test de activación plaquetaria disponible, la reexposición precoz a HNF exclusivamente durante el trasplante cardiaco podría ser una alternativa al uso de inhibidores directos de la trombina durante la CEC, siempre y cuando el recuento plaquetario se haya recuperado previamente y tras la intervención se reinicie un tratamiento anticoagulante alternativo a la heparina.
Autores: Martínez, Nicolás; Marcos-Jubilar, María; Alfonso, Ana; et al.
Revista: ANALES DEL SISTEMA SANITARIO DE NAVARRA
ISSN 1137-6627  Vol. 37  Nº 3  2014  págs. 363 - 369
Fundamento: Los concentrados de factores del complejo protrombínico (CCP) están indicados para reversión del efecto de antagonistas de vitamina K (AVK). Recientemente se han utilizado en el manejo de la coagulopatía de la hemorragia masiva. El objetivo del presente trabajo es evaluar la seguridad y eficacia del CCP en dos situaciones clínicas, para reversión de AVK y manejo integral de la hemorragia masiva. Material y métodos: Revisión retrospectiva de los casos tratados con CCP entre enero de 2010 y febrero de 2013 en un único centro universitario. El objetivo primario fue la seguridad de administración del CCP en cuanto a reacciones inmediatas y episodios trombóticos. El objetivo secundario fue la eficacia, en 2 grupos: 1) Reversión de AVK y 2) Corrección de coagulopatía en hemorragia masiva. Resultados: El análisis de seguridad incluyó 31 pacientes (22 varones), edad mediana 61 años (rango 30-86). No se registraron reacciones adversas durante la infusión y solo se observó un evento trombótico. La eficacia en la reversión de AVK fue del 100% (6/6 pacientes), alcanzando normalización del INR en todos los pacientes. En hemorragia masiva, la supervivencia a las 24 horas fue 64% (16/25). Se requirieron procedimientos invasivos adicionales en 28% de los pacientes (7/25). El uso de CCP se asoció a cese de hemorragia en 44% de los pacientes (11/25), que correlacionó positivamente con la supervivencia (p=0,01). Conclusión: El uso de CCP es una alternativa segura y eficaz, para la reversión urgente del efecto de AVK, así como para el control de sangrado en situación de hemorragia masiva.
Autores: Martínez, Nicolás; Marcos-Jubilar, María; Alfonso, Ana; et al.
Revista: ANALES DEL SISTEMA SANITARIO DE NAVARRA
ISSN 1137-6627  Vol. 37  Nº 3  2014  págs. 363-369
Autores: Martínez, Nicolás; Marcos-Jubilar, María; Alfonso, Ana; et al.
Revista: ANALES DEL SISTEMA SANITARIO DE NAVARRA
ISSN 1137-6627  Vol. 37  Nº 3  2014  págs. 363-369
CCP are safe and effective for the novel indication of adjuvant treatment in massive bleeding patients, as well as for traditional urgent reversal of VKA.
Autores: Alfonso, Ana; Redondo M; Rubio T; et al.
Revista: INTERNATIONAL JOURNAL OF CANCER
ISSN 0020-7136  Vol. 133  Nº 9  2013  págs. 2157-2164
Extensive screening strategies to detect occult cancer in patients with unprovoked venous thromboembolism (VTE) are complex and no benefit in terms of survival has been reported. FDG-PET/CT (2-[F-18] fluoro-2-deoxy-D-glucose positron emission tomography combined with computed tomography), a noninvasive technique for the diagnosis and staging of malignancies, could be useful in this setting. Consecutive patients ¿ 50 years with a first unprovoked VTE episode were prospectively included. Screening with FDG-PET/CT was performed 3¿4 weeks after the index event. If positive, appropriate diagnostic work-up was programmed. Clinical follow-up continued for 2 years. Blood samples were collected to assess coagulation biomarkers. FDG-PET/CT was negative in 68/99 patients (68.7%), while suspicious FDG uptake was detected in 31/99 patients (31.3%). Additional diagnostic work-up confirmed a malignancy in 7/31 patients (22.6%), with six of them at early stage. During follow-up, two patients with negative FDG-PET/CT were diagnosed with cancer. Sensitivity (S), positive (PPV) and negative predictive values (NPV) of FDG-PET/CT as single tool for the detection of occult malignancy were 77.8% (95% CI: 0.51¿1), 22.6% (95% CI: 0.08¿0.37) and 97.1% (95% CI: 0.93¿1), respectively. Median tissue factor (TF) activity in patients with occult cancer was 5.38 pM vs. 2.40 pM in those without cancer (p = 0.03). Limitation of FDG-PET/CT screening to patients with TF activity > 2.8 pM would improve the PPV t
Autores: Alfonso, Ana; Redondo M; Rubio T; et al.
Revista: INTERNATIONAL JOURNAL OF CANCER
ISSN 0020-7136  Vol. 133  Nº 9  2013  págs. 2157-2164
Extensive screening strategies to detect occult cancer in patients with unprovoked venous thromboembolism (VTE) are complex and no benefit in terms of survival has been reported. FDG-PET/CT (2-[F-18] fluoro-2-deoxy-D-glucose positron emission tomography combined with computed tomography), a noninvasive technique for the diagnosis and staging of malignancies, could be useful in this setting. Consecutive patients with a first unprovoked VTE episode were prospectively included. Screening with FDG-PET/CT was performed 3-4 weeks after the index event. If positive, appropriate diagnostic work-up was programmed. Clinical follow-up continued for 2 years. FDG-PET/CT was negative in 68/99 patients (68.7%), while suspicious FDG uptake was detected in 31/99 patients (31.3%). Additional diagnostic work-up confirmed a malignancy in 7/31 patients (22.6%), with six of them at early stage. During follow-up, two patients with negative FDG-PET/CT were diagnosed with cancer. Sensitivity (S), positive (PPV) and negative predictive values (NPV) of FDG-PET/CT as single tool for the detection of occult malignancy were 77.8% (95% CI: 0.51-1), 22.6% (95% CI: 0.08-0.37) and 97.1% (95% CI: 0.93-1), respectively. Median tissue factor (TF) activity in patients with occult cancer was 5.38 pM vs. 2.40 pM in those without cancer (p = 0.03). FDG-PET/CT is feasible for the screening of occult cancer in patients with unprovoked VTE, showing high S and NPV.
Autores: Lecumberri, Ramón; Marques, Margarita; et al.
Revista: THROMBOSIS AND HAEMOSTASIS
ISSN 0340-6245  Vol. 110  Nº 1  2013  págs. 184-190
Many cancer patients are at high risk of venous thromboembolism (VTE) during hospitalisation; nevertheless, thromboprophylaxis is frequently underused. Electronic alerts (e-alerts) have been associated with improvement in thromboprophylaxis use and a reduction of the incidence of VTE, both during hospitalisation and after discharge, particularly in the medical setting. However, there are no data regarding the benefit of this tool in cancer patients. Our aim was to evaluate the impact of a computer-alert system for VTE prevention in patients with cancer, particularly in those admitted to the Oncology/Haematology ward, comparing the results with the rest of inpatients at a university teaching hospital. The study included 32,167 adult patients hospitalised during the first semesters of years 2006 to 2010, 9,265 (28.8%) with an active malignancy. Appropriate prophylaxis in medical patients, significantly increased over time (from 40% in 2006 to 57% in 2010) and was maintained over 80% in surgical patients. However, while e-alerts were associated with a reduction of the incidence of VTE during hospitalisation in patients without cancer (odds ratio [OR] 0.31; 95% confidence interval [CI], 0.15-0.64), the impact was modest in cancer patients (OR 0.89; 95% CI, 0.42-1.86) and no benefit was observed in patients admitted to the Oncology/Haematology Departments (OR 1.11; 95% CI, 0.45-2.73). Interestingly, 60% of VTE episodes in cancer patients during recent years developed despite appro
Autores: Páramo, José Antonio; Alfonso, Ana;
Revista: MEDICINE (ELSEVIER)
ISSN 0304-5412  Vol. 11  Nº 22  2012  págs. 1359-65
Las coagulopatías adquiridas son procesos muy frecuentes en la práctica clínica. En general, son el resultado del consumo de factores de coagulación, como en la coagulación intravascular diseminada (CID), defecto de síntesis de factores, como en las hepatopatías y déficits de vitamina K, o como resultado de la presencia de anticoagulantes circulantes o de fármacos que alteran la coagulación (antivitaminas K, acenocumarol o warfarina). La intensidad de la hemorragia es muy variable, existiendo una pobre correlación con las alteraciones hemostáticas detectadas en los estudios rutinarios de coagulación (tiempo de protrombina y tromboplastina parcial activado, fibrinógeno, dímero D y recuento de plaquetas). El tratamiento debe ser individualizado y requiere el uso apropiado de hemoderivados, plasma, plaquetas y crioprecipitado, en combinación con agentes farmacológicos, tales como concentrado de factores del complejo protrombínico y antifibrinolíticos. La administración de vitamina K será esencial para corregir el déficit secundario al tratamiento con acenocumarol o warfarina.
Autores: Alfonso, Ana; Páramo, José Antonio;
Revista: MEDICINE (ELSEVIER)
ISSN 0304-5412  Vol. 11  Nº 22  2012  págs. 1366-70
El tromboembolismo venoso (TEV) es la tercera causa de mortalidad cardiovascular, tras el infarto agudo de miocardio y el ictus. Las secuelas del TEV a largo plazo son el síndrome postrombótico y la hipertensión pulmonar crónica. El diagnóstico se basa en modelos de probabilidad clínica, el dímero D y pruebas de imagen no invasivas, como ecografía para trombosis venosa profunda y angiotomografía computadorizada (TC) para embolismo pulmonar. La base del tratamiento la constituye la anticoagulación, generalmente con heparina no fraccionada o de bajo peso molecular por vía parenteral, seguida por antivitaminas K por vía oral (acenocumarol o warfarina) durante 3¿6 meses, requiriendo una estrecha monitorización del INR (índice normalizado internacional). Se han desarrollado nuevos anticoagulantes orales (dabigatran, rivaroxaban, apixaban) que pueden a corto plazo reemplazar a las heparinas y acenocumarol, con la ventaja de tener una administración oral y sin necesidad de monitorización.
Autores: Páramo, José Antonio; Alfonso, Ana;
Revista: MEDICINE (ELSEVIER)
ISSN 0304-5412  Vol. 11  Nº 22  2012  págs. 1337-44
Las púrpuras representan la patología genuina de los trastornos de la hemostasia primaria y se dividen en: a) púrpuras vasculares, con alteración en el componente vascular, con número y función plaquetaria normal y hemorragias cutáneas superficiales; b) púrpuras trombopénicas, causadas por un fallo cuantitativo en el componente plaquetario, de ellas, el cuadro más importante es la trombocitopenia inmune primaria (PTI) causada por autoanticuerpos antiplaquetarios, con una forma infantil autolimitada y otra crónica presente en adultos y cuadro hemorrágico cutaneomucoso; el tratamiento de primera línea de la PTI son los corticoides e inmunoglobulinas, y de segunda línea la esplenectomía y los nuevos agentes trombopoyéticos como romiplostin y eltrombopag y c) púrpuras trombopáticas, causadas por un fallo cualitativo, que pueden ser congénitas, como síndrome de Bernard-Soulier y trombastenia de Glanzmann, o adquiridas (por ejemplo, hepatopatía, enfermedad renal, ingesta de antiplaquetarios, etc.). El tratamiento se basa en la administración de antifibrinolíticos y desmopresina en las formas moderadas y concentrado de plaquetas y factor VII activado recombinante en las formas graves.