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Introducción: La tromboelastografía (TEG) es un método para valorar las características de la formación y destrucción del coágulo. Una variedad de aplicaciones han sido sugeridas en la literatura. Objetivo: Proporcionar un resumen acerca del conocimiento actual de las aplicaciones de la TEG. Métodos: Se realizó una búsqueda en la base de datos PubMed hasta julio de 2012 con el término «Thrombelastography [MeSH Terms]¼. Se analizaron artículos de estudios retrospectivos y prospectivos, revisiones y guías conteniendo información acerca de las aplicaciones de la TEG escritos en inglés y español. Resultados: La búsqueda arrojó 3.139 artículos desde 1962. Se clasificaron en 8 categorías: 862 (27,6%) asociados a enfermedades no quirúrgicas, 294 (9,4%) a trasplante hepático, 711 (22,6%) a investigación básica, 174 (5,5%) a obstetricia, 228 (7,3%) a cirugía cardiovascular, 177 (5,6%) a otras cirugías, 234 (7,4%) a técnicas anestésicas y 459 (14,6%) a fármacos. Conclusión: La TEG como herramienta diagnóstica y para guiar terapia transfusional está en aumento. La TEG aún continúa en estudio en diferentes áreas del conocimiento clínico y aún falta definir adecuadamente los alcances de esta técnica diagnóstica. Es evidente que se debe hacer un uso racional de la TEG, conocer a fondo sus fortalezas y debilidades y continuar explorando nuevas aplicaciones.

Introduction: Thrombelastography (TEG) is a method to assess clot formation and destruction. Various applications have been suggested in the literature. Objective: To provide an overview of the current knowledge about TEG applications. Methods: Adatabase search in PubMed was performed up to July 2012 using the term "Thrombelastography [MeSH Terms]". We analysed retrospective and prospective studies, reviews and guidelines with information about the applications of TEG written in English and Spanish. Results: The search resulted in 3139 papers since 1962. These were classified in 8 categories: 862 (27.6%) in non-surgical diseases, 294 (9.4%) in liver transplant, 711 (22.6%) in basic research, 174 (5.5%) in obstetrics, 228 (7.3%) in cardiovascular surgery, 177 (5.6%) in other types of surgery, 234 (7.4%) in anaesthetic techniques, and 459 (14.6%) in relation with medications. Conclusion: The application of TEG as a diagnostic tool and as a guide in transfusion therapy is increasing. Its use is still in development in different clinical fields and the advantages and limitations of this technique still have to be defined. It is evident that thrombelastography should be used with caution, and its strengths and weaknesses as well as new applications must continue to be explored.

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OBJECTIVE: To assess the diagnostic utility of [(18)F]flu-orodeoxyglucose positron emission tomography (FDG PET) in the follow-up of patients with differentiated thyroid cancer (DTC). METHODS: In this study, we used strict definitions of presence and absence of the disease and performed all FDG PET scans while the patients were not taking levothyroxine (LT4). We report the results of conventional FDG PET scans obtained during the follow-up of 50 nonselected patients with DTC (34 female and 16 male patients; median age, 40.5 years; range, 18 to 68). All FDG PET scans and measurement of thyroglobulin (Tg) levels were performed while the patients were not taking LT4 (thyrotropin>or=25 microIU/mL). Tg antibodies were negative in all patients. The initial surgical procedure was total thyroidectomy in all cases, and 26 patients underwent additional operations (2 to 4 procedures). Radioactive iodine (131I) therapy was given to 48 patients (median dose, 5,550 MBq). In 42 patients, FDG PET was used for evaluation of Tg-positive (Tg>2 ng/mL in the absence of LT4 therapy), scan-negative disease. In 8 patients, Tg was 2 ng/mL without LT4 therapy) for >1 year. Disease was considered absent if Tg was

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