[Serum uric acid levels and risk of developing preeclampsia]. / Niveles de ácido úrico sérico y riesgo de desarrollar preeclampsia.

It is well known that preeclampsia is associated to high uric acid levels, but the clinical assessment of this relationship is still under consideration. Our research was to evaluate if periodic doses of uric acid during pregnancy might help to identify a high risk group prior to the onset of preeclampsia. We conducted a retrospective investigation in 79 primary gestates with normal blood pressure and 79 women with preeclampsia who were assisted at Hospital Nacional Posadas during 2010. Serum uric acid levels, creatininemia, uremia, and proteinuria data from the clinical records of the pregnant women were considered. Uric acid levels were similar in both groups during the first half of gestation. However, as of the 20th week, uric acid increased 1.5-times in preeclamptic women with no changes in creatinine and urea, confirming that these patients had no renal complications. Furthermore, we noted that higher levels of uric acid correlated with low birth weight. We also observed that pregnant women with a family history of hypertension were more likely to develop this condition. Moreover, we did not find a direct relationship with the fetal sex or the appearance of clinical symptoms. The analytical evidence suggests that changes in uric acid concentrations may be due to metabolic alterations at the initial stages of preeclampsia. Therefore, we propose that monitoring levels of uric acid during pregnancy might contribute to the early control of this condition.

Assessing the Role of Uric Acid as a Predictor of Preeclampsia.

We assessed the diagnostic utility of uric acid for the prediction of preeclampsia. An observational prospective approach was carried out during 2014. Preeclamptic women were classified into 4 groups accordingly to the onset of preeclampsia and the presence of intrauterine growth restriction (IUGR). Serum uric acid levels, urea, and creatinine were measured. Receiver operating curves (ROC) of the uric acid levels ratio (UAr) between a dosage before and after the 20th week of gestation were performed. One thousand two hundred and ninety-third pregnant women were enrolled in this study. Eight hundred ten had non-complicated pregnancies, 40 preeclampsia, 33 gestational hypertension, and 20 IUGR without preeclampsia. Uric acid significantly raised after 20 weeks of gestation in women who develop preeclampsia before 34 weeks (Group A) or in those who develop preeclampsia after 37 weeks associated with IUGR (Group C). In women who develop preeclampsia after 34 weeks without IUGR (Groups B and D), uric acid increased after the 30th week of gestation. In all groups, UAr was greater than 1.5. In gestational hypertension, UAr was superior to 1.5 toward the end of gestation, while in IUGR without preeclampsia, the behavior of serum uric acid was similar to non-complicated pregnancies. In all cases, urea and creatinine showed normal values, confirming that patients had no renal compromise. ROC area was 0.918 [95% confidence interval (CI): 0.858-0.979) for the preeclampsia group and 0.955 (95% CI: 0.908-1.000) for Group A. UAr at a cut-off point ≥1.5 had a very low positive predictive value, but a high negative predictive value of 99.5% for preeclampsia and it reached 100% for Group A. Thus, a UAr less than 1.5 may be a helpful parameter with a strong exclusion value and high sensitivity for those women who are not expected to develop preeclampsia. Additionally, this low-cost test would allow for better use of resources in developing countries.

Prevalencia de la infección por Mycoplasma genitalium en mujeres embarazadas / Prevalence of Mycoplasma genitalium infection in pregnant women / Prevalência da infecção por Mycoplasma genitalium em gestantes

Resumen Durante los últimos 5-10 años se ha considerado a Mycoplasma genitalium como un agente emergente de infecciones de transmisión sexual. Su papel en el embarazo ha sido poco estudiado. La prevalencia en la Argentina es desconocida. El objetivo del trabajo fue determinar la prevalencia de M. genitalium en muestras endocervicales de mujeres embarazadas que concurrieron a un control ginecológico. La metodología utilizada para la detección fue una PCR de punto final que amplifica una secuencia específica del gen mgpB. Se estudiaron 270 mujeres embarazadas entre 15 y 42 años. La prevalencia global de M. genitalium fue de 5,2% (14/270). De las sintomáticas el 10% eran positivas (9/90) y de las pacientes asintomáticas 2,8% eran positivas (5/180). El 1,5% (4/270) presentó coinfección con Chlamydia trachomatis. Todas cursaban un embarazo de más de 12 semanas. Este es el primer trabajo de prevalencia de M. genitalium realizado en mujeres embarazadas en la Argentina. Se necesitan más estudios de asociación entre este microorganismo y las complicaciones en el embarazo para avanzar hacia la prevención y el control de esta infección.

Abstract Mycoplasma genitalium has been considered an emerging agent of sexually transmitted infections for the past 5-10 years. Its association with agent of non-gonococcal urethritis in men is well recognized. In women it has been linked to cervicitis, endometritis and pelvic inflammatory disease. Its role in pregnancy has been poorly studied. In Argentina, the prevalence is unknown. The objective of this work was to determine the prevalence of M. genitalium in endocervical samples of pregnant women who attended a gynecological control. An end-point PCR was used to amplify a specific sequence of the mgpB gene. A group of 270 pregnant women between 15 and 42 years were studied. The overall prevalence of M. genitalium was 5.2% (14/270). Among the symptomatic patients, 10% were positive (9/90), whereas among the asymptomatic patients, 2.8% were positive (5/180). Only 1.5% (4/270) presented co-infection with Chlamydia trachomatis. This is the first prevalence study on M. genitalium performed on pregnant women in Argentina. More studies are needed to understand the relationship between this microorganism and complications during pregnancy, in order to prevent and control this infection in women.

Resumo O Mycoplasma genitalium tem sido considerado um agente de infecções sexualmente transmissível emergente nos últimos 5 a 10 anos. Seu papel na gravidez tem sido pouco estudado. Na Argentina, a prevalência é desconhecida. O objetivo deste trabalho foi determinar a prevalência de M. genitalium em amostras endocervicais de gestantes que realizaram controle ginecológico. Uma PCR de ponto final foi utilizada como metodologia para a detecção, que amplifica uma sequência específica do gene mgpB. Um grupo de 270 gestantes entre 15 e 42 anos foi estudado. A prevalência geral de M. genitalium foi de 5,2% (14/270). Entre as pacientes sintomáticas, 10% foram positivas (9/90), ao passo que entre as assintomáticas, 2,8% foram positivas (5/180). Apenas 1,5% (4/270) apresentou coinfecção por Chlamydia trachomatis. Todas as mulheres estudadas estavam grávidas fazia mais de 12 semanas. Este é o primeiro estudo de prevalência sobre M. genitalium realizado em mulheres grávidas na Argentina. Mais estudos de associação entre esse microorganismo e as complicações na gravidez são necessários, a fim de avançar na prevenção e no controle desta infecção.

Niveles de ácido úrico sérico y riesgo de desarrollar preeclampsia

Si bien se conoce que existe una asociación entre los niveles elevados de ácido úrico y la preeclampsia, el debate sobre su aplicación clínica aún está abierto. Nuestro objetivo fue estudiar la utilidad del dosaje periódico del ácido úrico sérico durante el embarazo para identificar gestantes con mayor riesgo de desarrollar preeclampsia. Realizamos un estudio retrospectivo en gestantes primíparas: 79 normotensas y 79 con preeclampsia atendidas en el Hospital Nacional Posadas durante el año 2010. Se analizaron los niveles séricos de ácido úrico, creatinina y urea, y los datos de proteinuria de las historias clínicas de las mujeres embarazadas. Los niveles de ácido úrico fueron similares en ambos grupos durante la primera mitad de la gestación. Sin embargo, a partir de la semana 20, el ácido úrico se incrementó 1.5 veces en gestantes preeclámpticas, sin cambios en la uremia y creatininemia, descartándose así el compromiso renal. Además, encontramos que niveles más altos de ácido úrico se correlacionaban con bajo peso del recién nacido. También vimos que las gestantes con antecedentes familiares de hipertensión eran más propensas a desarrollar esta condición. Por otro lado, no observamos una relación directa ni con el sexo fetal ni con el tiempo de aparición de los síntomas clínicos. Estos hallazgos sugieren que los cambios en las concentraciones de ácido úrico se deberían a alteraciones en los estadios iniciales de la preeclampsia. Por ello, la monitorización de los niveles del mismo durante el embarazo podría contribuir al abordaje precoz de este desorden gestacional.

It is well known that preeclampsia is associated to high uric acid levels, but the clinical assessment of this relationship is still under consideration. Our research was to evaluate if periodic doses of uric acid during pregnancy might help to identify a high risk group prior to the onset of preeclampsia. We conducted a retrospective investigation in 79 primary gestates with normal blood pressure and 79 women with preeclampsia who were assisted at Hospital Nacional Posadas during 2010. Serum uric acid levels, creatininemia, uremia, and proteinuria data from the clinical records of the pregnant women were considered. Uric acid levels were similar in both groups during the first half of gestation. However, as of the 20th week, uric acid increased 1.5-times in preeclamptic women with no changes in creatinine and urea, confirming that these patients had no renal complications. Furthermore, we noted that higher levels of uric acid correlated with low birth weight. We also observed that pregnant women with a family history of hypertension were more likely to develop this condition. Moreover, we did not find a direct relationship with the fetal sex or the appearance of clinical symptoms. The analytical evidence suggests that changes in uric acid concentrations may be due to metabolic alterations at the initial stages of preeclampsia. Therefore, we propose that monitoring levels of uric acid during pregnancy might contribute to the early control of this condition.

Correlación de tres métodos para el dosaje de proteína C reactiva sérica: sus complicaciones clínicas / Three methods for detection of serum C reactive protein: a correlation study

Durante el año 2000 se empleban en este laboratorio tres métodos para el dosaje de proteína C reactiva (PCR) en suero: turbidimetría, nefelometría y aglutinación de partículas de látex. Ante la necesidad de normatizar las metodologías empleadas, el objetivo del presente estudio fue: a) Evaluar la correlación existente entre los métodos turbidimétrico y nefelométrico; b) Evaluar el valor de corte del método semicuantitativo de aglutinación y su correlación con los métodos cuantitativos; c) Evaluar las implicancias clínicas que surgen a partir del empleo de los mismos. Para la correlación entre los métodos cuantitativos fueron empleadas cincuenta y cinco muestras de suero y se tomó la nefelometría como referente. Sesenta y seis muestras fueron además procesadas por la prueba del látex. Se empleó el método de correlación lineal según Pearson y el test de Bland & Altaman para el análisis de distribución de las diferencias. El coeficiente de correlación resultó ser r=0,9689 e y=1,11 x+1,69 donde y=turbidimetría y x=nefelometría. Ambos métodos cuantitativos correlacionan bien, no obstante, existe entre ellos una diferencia no sistemática con valores más elevados para la turbidimetría. La prueba de aglutinación, para un valor de corte de 1 mg por ciento posee alto valor predictivo positivo con respecto a la turbidimetría