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        "resumen" => "<span class="elsevierStyleSectionTitle">Objective</span><p class="elsevierStyleSimplePara elsevierViewall">To determine the sensitivity and negative predictive value of D-dimer levels measured by fast enzyme-linked immunoabsorbent assay &#40;ELISA&#41; in pulmonary embolism&#46;</p> <span class="elsevierStyleSectionTitle">Patients and methods</span><p class="elsevierStyleSimplePara elsevierViewall">Prospective study of consecutive patients with suspicion of pulmonary embolism attended in the Emergency Room of the Hospital de la Princesa in Madrid&#44; Spain&#46; Thromboembolism was diagnosed with an algorithm established in the hospital&#44; and D-dimer levels were determined by fast ELISA &#40;VIDAS D-dimer Assay&#41; in each patient suspected of pulmonary embolism&#46; Patients with negative findings from a test not considered a reference method for thromboembolism were followed for 3 months&#46;</p> <span class="elsevierStyleSectionTitle">Results</span><p class="elsevierStyleSimplePara elsevierViewall">Of 132 patients with clinical suspicion&#44; 28 &#40;21&#46;2&#37;&#41; were positive and 104 &#40;78&#46;7&#37;&#41; were negative for embolism&#46; D-dimer levels were below 0&#46;5 &#956;g&#47;mL in 31 patients&#44; 30 of whom did not have pulmonary thromboembolism whereas 1 did&#46; D-dimer levels were abowe 0&#46;5 &#956;g&#47;mL in 101 patients&#59; thromboembolism did not occur in 74 of these but was reported in the remaining 27&#46; For a value of 1 &#956;g&#47;mL&#44; 66 patients had values below the cut off&#44; 3 of whom presented pulmonary embolism&#46; The remaining 66 patients had D-dimer levels above or equal to 1 &#956;g&#47;mL&#59; 25 of them had a positive diagnosis for embolism and 41 had a negative diagnosis&#46; Sensitivity and negative predictive values were 96&#46;4&#37; &#40;95&#37; confidence interval &#91;CI&#93;&#44; 79&#46;8&#37;-99&#46;9&#37;&#41; and 96&#46;8&#37; &#40;95&#37; CI&#44; 81&#46;5&#37;-98&#46;8&#37;&#41;&#44; respectively&#44; at a cut off of 0&#46;5 &#956;g&#47;mL&#59; and 89&#46;2&#37; &#40;95&#37; CI&#44; 70&#46;6&#37;-97&#46;2&#37;&#41; and 95&#46;45&#37; &#40;95&#37; CI&#44; 86&#46;4&#37;-98&#46;8 &#37;&#41;&#44; respectively&#44; at a cut off of 1 &#956;g&#47;mL&#46;</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p class="elsevierStyleSimplePara elsevierViewall">In an emergency room&#44; thromboembolism can be excluded if plasma levels of D-dimer measured by fast ELISA are below 0&#46;5 &#956;g&#47;mL because of the high negative predictive value at this cut off&#46;</p>"
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        "resumen" => "<span class="elsevierStyleSectionTitle">Objetivo</span><p class="elsevierStyleSimplePara elsevierViewall">Determinar la sensibilidad y el valor predictivo negativo del d&#237;mero-D&#44; por enzimoinmunoan&#225;lisis &#40;ELISA&#41; r&#225;pido&#44; en la embolia pulmonar&#46;</p> <span class="elsevierStyleSectionTitle">Pacientes y m&#233;atodos</span><p class="elsevierStyleSimplePara elsevierViewall">Estudio prospectivo de pacientes atendidos consecutivamente por sospecha cl&#237;nica de embolia en el Servicio de Urgencias del Hospital de la Princesa de Madrid&#46; El diagn&#243;stico de tromboembolia se bas&#243; en el algoritmo establecido en el hospital&#44; y se determin&#243; el d&#237;mero-D por ELISA &#40;VIDAS&#41; en cada paciente con sospecha de embolia pulmonar&#46; A los pacientes con resultado negativo para tromboembolia&#44; establecido por una prueba no considerada de referencia&#44; se les realiz&#243; seguimiento cl&#237;nico a los 3 meses&#46;</p> <span class="elsevierStyleSectionTitle">Resultados</span><p class="elsevierStyleSimplePara elsevierViewall">De 132 pacientes con sospecha cl&#237;nica&#44; 28 &#40;21&#44;2&#37;&#41; fueron positivos y 104 &#40;78&#44;7&#37;&#41; negativos para embolia&#46; El d&#237;mero-D fue &#60; a 0&#44;5 &#956;g&#47;ml en 31 pacientes&#44; de los que 30 no tuvieron tromboembolia pulmonar y 1 s&#237; la tuvo&#46; De los 101 pacientes con d&#237;mero-D &#62; 0&#44;5 &#956;g&#47;ml&#44; en 74 no se produjo tromboembolia y en 27 s&#237;&#46;</p><p class="elsevierStyleSimplePara elsevierViewall">Si se considera como punto de corte 1 &#956;g&#47;ml&#44; hubo 66 pacientes con valores inferiores&#44; de los que 3 presentaron embolia pulmonar&#46; Otros 66 pacientes mostraron un d&#237;mero-D &#8804; 1 &#956;g&#47;ml&#59; de ellos&#44; 25 tuvieron un diagn&#243;stico positivo para embolia y 41 negativo&#46; La sensibilidad y el valor predictivo negativo para 0&#44;5 &#956;g&#47;ml fue de 96&#44;4 &#40;intervalo de confianza &#91;IC&#93; del 95&#37;&#44; 79&#44;8-99&#44;9&#41; y 96&#44;8 &#40;IC del 95&#37;&#44; 81&#44;5-98&#44;8&#41;&#44; respectivamente&#59; para 1 &#956;g&#47;ml fue de 89&#44;2 &#40;IC del 95&#37;&#44; 70&#44;6-97&#44;2&#41; y 95&#44;45 &#40;IC del 95&#37;&#44; 86&#44;4-98&#44;8&#41;&#44; respectivamente&#46;</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p class="elsevierStyleSimplePara elsevierViewall">Los valores de d&#237;mero-D plasm&#225;tico&#44; determinados por la t&#233;cnica de ELISA r&#225;pido &#40;VIDAS&#41;&#44; &#60; 0&#44;5 &#956;g&#47;ml permiten excluir con alto valor predictivo negativo una tromboembolia pulmonar en un servicio de urgencias&#46;</p>"
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Vol. 41. Issue 9.
Pages 499-504 (September 2005)
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Vol. 41. Issue 9.
Pages 499-504 (September 2005)
Original Articles
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Usefulness of Fast ELISA Determination of D-Dimer Levels for Diagnosing Pulmonary Embolism in an Emergency Room
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A. Friera-Reyesa,
Corresponding author
alfita1@telefonica.net

Correspondence: Dr. A. Friera-Reyes. Servicio de Radiodiagnóstico. Hospital de la Princesa. Diego de León, 62. 28006 Madrid. España
, P. Caballeroa, N. Ruiz-Giménezb, P. Artiedac, L. Domínguezd, E. Pérez-Amore, C. Suárezb, for the Venous Thromboembolic Disease Working Group
a Servicio de Radiodiagnóstico, Hospital de la Princesa, Madrid, Spain
b Servicio de Medicina Interna, Hospital de la Princesa, Madrid, Spain
c Servicio de Análisis Clínico, Hospital de la Princesa, Madrid, Spain
d Servicio de Medicina Nuclear, Hospital de la Princesa, Madrid, Spain
e Servicio de Neumología, Hospital de la Princesa, Madrid, Spain
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Objective

To determine the sensitivity and negative predictive value of D-dimer levels measured by fast enzyme-linked immunoabsorbent assay (ELISA) in pulmonary embolism.

Patients and methods

Prospective study of consecutive patients with suspicion of pulmonary embolism attended in the Emergency Room of the Hospital de la Princesa in Madrid, Spain. Thromboembolism was diagnosed with an algorithm established in the hospital, and D-dimer levels were determined by fast ELISA (VIDAS D-dimer Assay) in each patient suspected of pulmonary embolism. Patients with negative findings from a test not considered a reference method for thromboembolism were followed for 3 months.

Results

Of 132 patients with clinical suspicion, 28 (21.2%) were positive and 104 (78.7%) were negative for embolism. D-dimer levels were below 0.5 μg/mL in 31 patients, 30 of whom did not have pulmonary thromboembolism whereas 1 did. D-dimer levels were abowe 0.5 μg/mL in 101 patients; thromboembolism did not occur in 74 of these but was reported in the remaining 27. For a value of 1 μg/mL, 66 patients had values below the cut off, 3 of whom presented pulmonary embolism. The remaining 66 patients had D-dimer levels above or equal to 1 μg/mL; 25 of them had a positive diagnosis for embolism and 41 had a negative diagnosis. Sensitivity and negative predictive values were 96.4% (95% confidence interval [CI], 79.8%-99.9%) and 96.8% (95% CI, 81.5%-98.8%), respectively, at a cut off of 0.5 μg/mL; and 89.2% (95% CI, 70.6%-97.2%) and 95.45% (95% CI, 86.4%-98.8 %), respectively, at a cut off of 1 μg/mL.

Conclusions

In an emergency room, thromboembolism can be excluded if plasma levels of D-dimer measured by fast ELISA are below 0.5 μg/mL because of the high negative predictive value at this cut off.

Key Words:
Pulmonary embolism
Thromboembolic disease
D-dimer
Objetivo

Determinar la sensibilidad y el valor predictivo negativo del dímero-D, por enzimoinmunoanálisis (ELISA) rápido, en la embolia pulmonar.

Pacientes y méatodos

Estudio prospectivo de pacientes atendidos consecutivamente por sospecha clínica de embolia en el Servicio de Urgencias del Hospital de la Princesa de Madrid. El diagnóstico de tromboembolia se basó en el algoritmo establecido en el hospital, y se determinó el dímero-D por ELISA (VIDAS) en cada paciente con sospecha de embolia pulmonar. A los pacientes con resultado negativo para tromboembolia, establecido por una prueba no considerada de referencia, se les realizó seguimiento clínico a los 3 meses.

Resultados

De 132 pacientes con sospecha clínica, 28 (21,2%) fueron positivos y 104 (78,7%) negativos para embolia. El dímero-D fue < a 0,5 μg/ml en 31 pacientes, de los que 30 no tuvieron tromboembolia pulmonar y 1 sí la tuvo. De los 101 pacientes con dímero-D > 0,5 μg/ml, en 74 no se produjo tromboembolia y en 27 sí.

Si se considera como punto de corte 1 μg/ml, hubo 66 pacientes con valores inferiores, de los que 3 presentaron embolia pulmonar. Otros 66 pacientes mostraron un dímero-D ≤ 1 μg/ml; de ellos, 25 tuvieron un diagnóstico positivo para embolia y 41 negativo. La sensibilidad y el valor predictivo negativo para 0,5 μg/ml fue de 96,4 (intervalo de confianza [IC] del 95%, 79,8-99,9) y 96,8 (IC del 95%, 81,5-98,8), respectivamente; para 1 μg/ml fue de 89,2 (IC del 95%, 70,6-97,2) y 95,45 (IC del 95%, 86,4-98,8), respectivamente.

Conclusiones

Los valores de dímero-D plasmático, determinados por la técnica de ELISA rápido (VIDAS), < 0,5 μg/ml permiten excluir con alto valor predictivo negativo una tromboembolia pulmonar en un servicio de urgencias.

Palabras clave:
Embolia pulmonar
Enfermedad tromboembólica
Dímero-D
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