Analysis of invasive diagnostic techniques for pathological confirmation of pleural mesothelioma.

BACKGROUND AND OBJECTIVES: Mesothelioma is an infrequent neoplasm with a poor prognosis that is related to exposure to asbestos and whose peak incidence in Europe is estimated from 2020. Its diagnosis is complex; imaging techniques and the performance of invasive pleural techniques being essential for pathological confirmation. The different diagnostic yields of these invasive techniques are collected in the medical literature. The present work consisted of reviewing how the definitive diagnosis of mesothelioma cases in our centre was reached to check if there was concordance with the data in the bibliography. MATERIALS AND METHODS: Retrospective review of patients with a diagnosis of pleural mesothelioma in the period 2019-2021, analysing demographic data and exposure to asbestos, the semiology of the radiological findings and the invasive techniques performed to reach the diagnosis. RESULTS: Twenty-six mesothelioma cases were reviewed. 22 men and 4 women. Median age 74 years. 9 patients had a history of asbestos exposure. Moderate-severe pleural effusion was the most frequent radiological finding (23/26). The sensitivity of the invasive techniques was as follows: Cytology 13%, biopsy without image guidance 11%, image-guided biopsy 93%, surgical biopsy 67%. CONCLUSIONS: In our review, pleural biopsy performed with image guidance was the test that had the highest diagnostic yield, so it should be considered as the initial invasive test for the study of mesothelioma.

Quilotórax con características de trasudado en paciente con cirrosis hepática avanzada / [Chylothorax with characteristics of transudate in a patient with advanced liver cirrhosis]

El quilotórax es una patología infrecuente e infradiagnosticada en la cirrosis hepática, que se caracteriza por la determinación de >110 mg/dl de triglicéridos o presencia de quilomicrones en el líquido pleural. Fisiopatológicamente aparece por cambios en el sistema linfático secundarios a la hipertensión portal. El tratamiento es principalmente conservador, aunque el TIPS podría ser una opción segura y útil en estos pacientes al actuar sobre la hemodinámica portal. Presentamos el caso de una paciente con esta entidad y que se manejó de forma conjunta entre Digestivo y Neumología. (AU)

Chylothorax is an infrequent and underdiagnosed pathology in liver cirrhosis, characterized by the determination of >110 mg/dl of triglycerides or the presence of chylomicrons in the pleural fluid. Pathophysiologically, it appears due to changes in the lymphatic system secondary to portal hypertension. Treatment is mainly conservative, although TIPS could be a safe and useful option in these patients by acting on portal haemodynamics. We present the case of a patient with this entity and that was managed jointly between Digestive and Pulmonology. (AU)

¿Cuál es el rol actual de la toracocentesis en el hidrotórax fetal severo? Presentación de caso

Se llama hidrotórax a una efusión pleural primaria que ocurre durante la vida prenatal (denominado 'quilotórax primario' después del nacimiento). En ciertos casos, esta efusión es severa y produce compresión pulmonar y cardiaca, por lo cual, la mortalidad perinatal sigue siendo alta. Los recién nacidos con hidrotórax requieren, muchas veces, de drenaje, nutrición parenteral total y medicación específica para su recuperación. Sin embargo, las intervenciones prenatales, principalmente con derivaciones toraco-amnióticas, pueden mejorar estos resultados. Reportamos el caso de un feto con hidrotórax severo a quien se le realizó una toracocentesis y revisamos la literatura acerca de su rol en el tratamiento prenatal actual.

Hydrothorax is a primary pleural effusion that occurs during prenatal life (called "primary chylothorax" after birth). In certain cases, this effusion is severe and produces pulmonary and cardiac compression, and perinatal mortality remains high. Newborns with hydrothorax often require drainage, total parenteral nutrition and specific medication for their recovery. However, prenatal interventions, mainly with thoraco-amniotic shunts, can improve these results. We report the case of a fetus with severe hydrothorax who underwent thoracentesis and review the literature on its role in current prenatal management.

Ultrasound-guided interventional radiology procedures in the chest.

Ultrasonography is a very good tool for guiding different interventional procedures in the chest. It is the ideal technique for managing conditions involving the pleural space, and it makes it possible to carry out procedures such as thoracocentesis, biopsies, or drainage. In the lungs, only lesions in contact with the costal pleura are accessible to ultrasound-guided interventions. In this type of lung lesions, ultrasound is as effective as computed tomography to guide interventional procedures, but the rate of complications and time required for the intervention are lower for ultrasound-guided procedures.

Claves diagnósticas en el paciente adulto con derrame pleural: revisión narrativa / Diagnostic pitfalls of the adult patient with pleural effusion: narrative review

RESUMEN El derrame pleural se define como la acumulación anormal de líquido en el espacio pleural, que se produce por el aumento en la producción o disminución en su drenaje. Es una entidad frecuente en la práctica clínica y obedece a múltiples causas, las cuales varían de acuerdo con la epidemiología local, los antecedentes y el contexto clínico. Es determinante el análisis del líquido pleural, cuando esté indicado, así como otras ayudas diagnósticas teniendo en cuenta la presentación clínica con énfasis en las condiciones comórbidas y las infecciones. De estas últimas, se destaca la tuberculosis y la neumonía, entidades bastante frecuentes en nuestro medio. El tratamiento va dirigido a la causa de base, aunque hasta en el 25 % de los pacientes no se identifica una causa evidente.

SUMMARY Pleural effusion is defined as the abnormal accumulation of fluid in the pleural space that is caused by its increased production or decreased drainage. It is a frequent entity in clinical practice, due to multiple causes, which vary according to local epidemiology, personal history and clinical context. The analysis of pleural fluid will be decisive when indicated, as well as another diagnostic tool taking into account the clinical presentation, emphasizing comorbid conditions and infections, including tuberculosis and pneumonia; quite frequent entities in our environment. The treatment is aimed at the underlying cause, although up to 25% of patients do not identify an obvious cause.

[Thoracentesis in Primary Care]. / Toracocentesis en Atención Primaria.

Thoracentesis is a simple test with few complications that provides relevant information in the diagnosis of a pleural effusion, through a correct interpretation of the pleural fluid analysis. An interesting initiative would be to incorporate this technique by those Primary Care teams that treat serious and complex patients, with difficulties in moving to specialised centres far from their homes. In this context, a good knowledge of the diagnostic possibilities offered by the pleural fluid analysis could be very useful in the hands of well trained staff to establish the aetiology of a pleural effusion and be able to initiate, as quickly as possible, its treatment. This article aims to contribute to this, by suggesting guidelines on how a simple technique can provide relevant information in order to determine the aetiology of pleural effusion, and which could be implemented within a given Primary Care framework.

Generalidades del quilotórax en el paciente adulto / Generalities of the chylothorax in the adult patient

Resumen El quilotórax se produce ante la ruptura, desgarro u obstrucción del conducto torácico o sus afluentes principales, lo que resulta en la liberación de quilo al espacio pleural. Ocurre más frecuentemente asociado a trauma o a lesiones malignas; pero han sido descritas otras causas. El diagnóstico se obtiene mediante toracocentesis y la determinación de las concentraciones de triglicéridos y colesterol en el líquido pleural. Las complicaciones incluyen la desnutrición, inmunosupresión y compromiso respiratorio. El tratamiento puede ser conservador o agresivo en función de la situación clínica.

Abstract Chylothorax occurs when there is rupture, laceration or obstruction of the thoracic duct or its main tributaries, resulting in the release of chyle into the pleural space. It most commonly occurs from trauma or malignancy, but other causes have been described. Diagnosis involves thoracocentesis and cholesterol and triglyceride measurement in the pleural fluid. Complications include malnutrition, immunosuppression and respiratory distress. Treatment may be either conservative or aggressive depending on the clinical scenario.

Detection of Pleural Fluid Biochemistry Changes in Two Consecutive Thoracenteses for Differentiating Malignant from Benign Effusions. / Cambios en los parámetros bioquímicos del líquido pleural entre 2 toracocentesis consecutivas para diferenciar derrames malignos de benignos.

OBJECTIVE: To assess whether changes in pleural fluid (PF) biochemistries between two consecutive thoracenteses enable clinicians to predict malignant or benign pleural effusions (PE). METHODS: Retrospective study of patients with lymphocytic exudates and negative PF cytology, who underwent a second thoracentesis in our center in the last 15 years in whom a final diagnosis was reached (derivation sample). Absolute (Δa) and percentage differences (Δp) in PF biochemistries which predicted a malignant or benign PE in the derivation sample were evaluated in an independent population (validation sample). RESULTS: The derivation sample included 214 PE patients (70 malignant and 144 benign PE). Δp lactate dehydrogenase (LDH) >0%, Δp neutrophils >-10% (any increase or less than 10% decrease) and Δa protein <0.1g/dL (any increase or less than 0.1g/dL decrease) between the second and the first thoracentesis had an odds ratio of 6.4, 3.9 and 2.1, respectively, to discriminate malignant from benign PE. The presence of the three conditions together had a positive likelihood ratio of 5.6, whereas the absence of any of the 3 parameters had a likelihood ratio of 0.04 for predicting malignancy. These results were reproduced in the validation sample. CONCLUSION: An increase in LDH and neutrophils along with a decrease in protein in a second thoracentesis increase the probability of malignant PE, while the opposite reduces it significantly.

Diagnóstico y tratamiento del derrame pleural paraneumónico / Diagnosis and treatment of parapneumonic pleural effusion

El derrame paraneumónico ocurre como complicación de una neumonía y en nuestro medio corresponde al 2% de las hospitalizaciones de causa respiratoria. Se debe sospechar en pacientes con neumonía presentan evolución desfavorable y debe confirmarse por exámenes de imágenes. El estudio y drenaje del líquido pleural es fundamental para un manejo adecuado y evolución satisfactoria, por lo que la toracocentesis y la instalación de drenaje pleural no deben retrasarse. El tratamiento debe ser hospitalizado, con antibióticos endovenosos y en la mayoría de los casos la evolución es satisfactoria y sin secuelas para el paciente.

Paraneumonic effusion occurs as a complication of pneumonia and in our case corresponds to 2% of respiratory hospitalizations. It should be suspected in patients with pneumonia presenting unfavorable evolution and must be confirmed by imaging tests. The study and drainage of pleural fluid is essential for adequate management and satisfactory evolution, so that thoracentesis and pleural drainage installation should not be delayed. The treatment should be hospitalized with intravenous antibiotics and in most cases the evolution is satisfactory and without sequelae for the patient.

A survey to medical residents on the performance of diagnostic and therapeutic thoracenteses: a training gap? / Una encuesta a médicos residentes sobre la realización de toracocentesis diagnósticas y terapéuticas: ¿una laguna en la formación?

OBJECTIVE: Pleural fluid aspiration is a routine procedure for pulmonologists and internists. Our aim was to evaluate technical and methodological aspects of diagnostic and therapeutic thoracenteses performed by last two-year residents of Pulmonology and Internal Medicine. METHODS: An online 24-item questionnaire was sent to participants, and responses were evaluated according to the medical specialty. RESULTS: The survey was completed by 139 (17.1%) residents (71 internists and 68 pulmonologists). 29.5% and 41% performed one or no diagnostic or therapeutic thoracenteses monthly, respectively. Only 44% used ultrasonography to guide pleural procedures. Less than half of respondents used local anesthesia for diagnostic aspirations. Contrary to current recommendations, 25% of residents employed intramuscular needles for therapeutic aspirations. More than 80% of residents routinely ordered pleural fluid cultures and cytological studies, regardless of the clinical suspicion. About 40% requested imaging studies after a diagnostic thoracentesis. Half or more of the respondents were unaware of pH measurement methodologies, culture type for mycobacteria, and performance of cell blocks. Pulmonologists were more experienced than internists, and also made use of ultrasonography more frequently. CONCLUSION: This survey highlights gaps of knowledge and skills in conducting diagnostic and therapeutic thoracenteses.

Pleural ultrasound for clinicians. / Ecografía pleural para clínicos.

Pleural ultrasonography is useful for identifying and characterising pleural effusions, solid pleural lesions (nodules, masses, swellings) and pneumothorax. Pleural ultrasonography is also considered the standard care for guiding interventionist procedures on the pleura at the patient's bedside (thoracentesis, drainage tubes, pleural biopsies and pleuroscopy). Hospitals should promote the acquisition of portable ultrasound equipment to increase the patient's safety.

Interventional procedures in the chest. / Intervencionismo no vascular en tórax.

Many thoracic conditions will require an interventional procedure for diagnosis and/or treatment. For this reason, radiologists need to know the indications and the technique for each procedure. In this article, we review the various interventional procedures that radiologists should know and the indications for each procedure. We place special emphasis on the potential differences in the diagnostic results and complications between fine-needle aspiration and biopsy. We also discuss the indications for radiofrequency ablation of lung tumors and review the concepts related to the drainage of pulmonary abscesses. We devote special attention to the management of pleural effusion, covering the indications for thoracocentesis and when to use imaging guidance, and to the protocol for pleural drainage. We also discuss the indications for percutaneous treatment of pericardial effusion and the possible complications of this treatment. Finally, we discuss the interventional management of mediastinal lesions and provide practical advice about how to approach these lesions to avoid serious complications.

Unilateral or Bilateral Thoracocentesis for Bilateral Pleural Effusion. A Prospective Study.

INTRODUCTION: In the absence of firm recommendations, we analyzed whether unilateral thoracic puncture is sufficient for bilateral pleural effusion (PE), or if the procedure needs to be performed in both sides. MATERIALS AND METHODS: Prospective study of patients seen consecutively for bilateral PE during a period of 3 years and 9 months. All patients underwent simultaneous bilateral thoracocentesis. The standard protocol variables collected in our hospital served as study parameters. Size of PE, presence of chest pain or fever, or accompanying lung abnormalities, different attenuation values on chest computed tomography, presence of loculated pleural fluid, and radiological resolution in a single side were also evaluated. RESULTS: A total of 36 patients (19 men; mean age 68.5 ± 16.5 years) were included. The etiology of the effusion was different in each side in only 2 patients (5.6%). In 6/32 cases (18.8%), the biological analysis of the pleural fluid (in terms of transudate/exudate) from both sides did not correspond with the etiological diagnosis of the effusion. Correlation between biochemical parameters analyzed in the fluid from both sides (Pearson's correlation coefficient) ranged between 0.74 (LDH) and 0.998 (NT-proBNP). As different diagnoses in each side were found in only 2 patients, the circumstances in which bilateral diagnostic thoracocentesis would be necessary could not be determined. CONCLUSIONS: Simultaneous bilateral thoracocentesis does not appear to be recommendable. Larger series are needed to establish which factors might suggest the need for simultaneous puncture of both PE.

Hidrotórax fetal primario: manejo antenatal / Fetal hydrothorax primary: handling antenatal

Hidrotórax fetal (HF) es la presencia de líquido en la cavidad pleural del tórax. Puede ser aislado o asociado con Hídrops y ascitis fetal. La incidencia 1:15.000 embarazos. Si es aislado, la causa más frecuente es quilotórax congénito, anomalía primaria del sistema linfático. En recién nacido (RN) es frecuente en el sexo masculino, primario y generalmente bilateral. En el feto, el secundario con prevalencia 1:1500 nacidos vivos y generalmente causado por isoinmunización, infecciones, cardiopatías, cromosomopatías, malformaciones de placenta y cordón umbilical. La edad promedio del diagnóstico son 27 semanas, reconociéndose ultrasonográficamente como un área anecoica alrededor de los pulmones. Su pronóstico depende fundamentalmente de la causa y secundariamente de su magnitud, lateralidad y presencia de hídrops. La mortalidad se estima en 25%, variando de 15% cuando es aislado y 95% asociado a hídrops. La mayoría, empeoran con el embarazo, haciéndose bilateral, puede genera compresión esofágica en Hidrotórax fetal primario (HFP) asociados a polihidramnios 72%. Se reporta caso de HFP, en paciente de 20 años con 25 semanas de gestación, cuyo hallazgo ultrasonográfico documenta derrame pleural derecho, se realiza toracocentesis intrauterina, obteniendo 25cc de líquido amarillento, posteriormente hay disminución del derrame pleural. Se obtuvo en cesárea segmentaria electiva a las 37 semanas + 6 días; RN femenino en estables condiciones generales, no requirió intubación ni soporte ventilatorio artificial. La evacuación intrauterina alivió la presión intratorácica, permitiendo una expansión satisfactoria de ambos pulmones y evitando la insuficiencia respiratoria del R.

Fetal hydrothorax (FH) is the presence of fluid in the pleural cavity of the chest. It may be isolated or associated with fetal hydrops and ascites. The incidence 1: 15,000 pregnancies If it is isolated, the most common cause is congenital chylothorax primary abnormality of the lymphatic system. In Newborn (RN) is common in males, usually bilateral primary and sex. In the fetus is secondary with prevalence 1: 1500 live births caused by isoimmunization, infections, heart disease, chromosomal abnormalities, malformations of placenta and umbilical cord. The average age of diagnosis is 27 weeks, ultrasonographically recognized as an anechoic area around the lungs. His prognosis mainly depends on the cause and secondarily of its size, laterality and presence of hydrops. The mortality is estimated at 25%, varying from 15% when it is isolated and 95% associated with hydrops. Most worsen bilateral becoming pregnancy can generate esophageal compression in primary fetal Hydrothorax (HFP) associated with polyhydramnios 72%. HFP case is reported, a patient of 20 years with 25 weeks of gestation, whose ultrasonographic finding documents right pleural effusion, intrauterine thoracentesis is done, obtaining 25cc yellowish liquid, then no decrease in the pleural effusion. It was obtained segmental elective Caesarean at 37 weeks + 6 days; Female RN in stable conditions did not require intubation or artificial ventilatory support. Intrauterine evacuation intrathoracic pressure relieved, allowing a satisfactory expansion of both lungs and respiratory distress avoiding RN.

Enfoque diagnóstico en el paciente con derrame pleural / Diagnostic approach in pleural effusion

En el estudio diagnóstico del paciente con derrame pleural se deben considerar la historia clínica y el análisis de las imágenes para acotar el diagnóstico diferencial. El uso adecuado de las técnicas de imágenes contribuye a realizar procedimientos en forma segura. Se debe realizar una toracocentesis diagnóstica y/o evacuadora y se debe analizar completamente el líquido pleural. A veces es necesario realizar biopsia pleural para lo cual existen diversas técnicas disponibles. En los pacientes con pleuritis crónica inespecífica se debe hacer seguimiento por dos años para evaluar el desarrollo de malignidad.

The diagnostic approach in patients with pleural effusion must begin considering clinical aspects and image interpretation. Different imaging techniques can safely guide invasive procedures. Diagnostic or therapeutic thoracentesis must be performed and pleural fluid must be completely analyzed. Some patient will require pleural biopsy, and different techniques are available. Patients with chronic unspecific pleuritis histological diagnosis after pleural biopsy, must be followed for two years long to be sure no malignancy is developed.

Tratamiento paliativo de los derrames pleurales malignos mediante abrasión química / Palliative treatment of malignant pleural effusions with chemical abrasion

Introducción: el tratamiento del derrame pleural maligno constituye un reto para los cirujanos. Su erradicación permanente ha constituido un largo bregar, y para ello se ha utilizado un numeroso grupo de sustancias. Objetivo: mostrar los resultados del uso de diferentes sustancias químicas para conseguir la fusión de las pleuras en el derrame pleural maligno. Métodos: fueron estudiados 116 pacientes con derrames malignos de pleura tratados mediante toracocentesis y escleroterapia química en el Hospital Universitario Comandante Manuel Fajardo entre enero de 2001 y el 2013. El diagnóstico del 100 por ciento de los pacientes fue clínico e imaginológico, con estudio del líquido pleural. Después de la toma de muestra se evacuó todo el contenido mediante un catéter colector y la instilación de la solución esclerosante. Como agentes irritantes se utilizó bleomicina, tetraciclina, amoxicilina y povidona yodada. Resultados: la causa más frecuente de derrame pleural resultó ser el cáncer de mama, seguido por el de pulmón y el ovario. En el hombre fue más frecuente el cáncer de pulmón y en la mujer el cáncer de mama. Predominó el sexo femenino y, específicamente, la sexta década de la vida. El 52,4 por ciento de los pacientes necesitó dos sesiones terapéuticas y el 15,6 por ciento no presentó recidiva después de la primera sesión. Conclusiones: los resultados fueron similares con todas las sustancias utilizadas. La intervención paliativa logró mejorar la calidad de vida al aliviar los síntomas de los pacientes y disminuir la hospitalización(AU)

Introduction: the treatment of the malignant pleural effusion poses a challenge for the surgeons, its permanent eradication has been a long struggle based on the use of a number of substances. Objective: To show the results of the use of different chemical substances to fuse the pleuras in malignant pleural effusion. Methods: one hundred and sixteen patients with malignant pleural effusions, who were treated with thoracentesis and chemical sclerotherapy at Comandante Manuel Fajardo university hospital from January 2001 through January 2013, participated in the study. Their diagnosis was based on clinical examination and imaging, with additional pleural fluid study. After the sample-taking, a collecting catheter and an instilled sclerosing solution were used to remove the whole pleural content, whereas bleomycin, tetracycline, amoxicillin and povidone iodine acted as irritating agents. Results: the most frequent cause of pleural effusion was breast cancer, followed by lung and ovary cancers. The lung cancer was commonest in men and breast cancer in females. Females and the age of 60 years prevailed. In this group, 52.4 por ciento required two therapeutic sessions and 15.6 por ciento showed no relapse after the first session. Conclusions: the results were similar with all the used substances. The palliative intervention succeeded in improving the quality of life, releasing symptoms and reducing hospitalization(AU)

Tratamiento paliativo de los derrames pleurales malignos mediante abrasión química / Palliative treatment of malignant pleural effusions with chemical abrasion

Introducción: el tratamiento del derrame pleural maligno constituye un reto para los cirujanos. Su erradicación permanente ha constituido un largo bregar, y para ello se ha utilizado un numeroso grupo de sustancias. Objetivo: mostrar los resultados del uso de diferentes sustancias químicas para conseguir la fusión de las pleuras en el derrame pleural maligno. Métodos: fueron estudiados 116 pacientes con derrames malignos de pleura tratados mediante toracocentesis y escleroterapia química en el Hospital Universitario Comandante Manuel Fajardo entre enero de 2001 y el 2013. El diagnóstico del 100 por ciento de los pacientes fue clínico e imaginológico, con estudio del líquido pleural. Después de la toma de muestra se evacuó todo el contenido mediante un catéter colector y la instilación de la solución esclerosante. Como agentes irritantes se utilizó bleomicina, tetraciclina, amoxicilina y povidona yodada. Resultados: la causa más frecuente de derrame pleural resultó ser el cáncer de mama, seguido por el de pulmón y el ovario. En el hombre fue más frecuente el cáncer de pulmón y en la mujer el cáncer de mama. Predominó el sexo femenino y, específicamente, la sexta década de la vida. El 52,4 por ciento de los pacientes necesitó dos sesiones terapéuticas y el 15,6 por ciento no presentó recidiva después de la primera sesión. Conclusiones: los resultados fueron similares con todas las sustancias utilizadas. La intervención paliativa logró mejorar la calidad de vida al aliviar los síntomas de los pacientes y disminuir la hospitalización(AU)

Introduction: the treatment of the malignant pleural effusion poses a challenge for the surgeons, its permanent eradication has been a long struggle based on the use of a number of substances. Objective: To show the results of the use of different chemical substances to fuse the pleuras in malignant pleural effusion. Methods: one hundred and sixteen patients with malignant pleural effusions, who were treated with thoracentesis and chemical sclerotherapy at Comandante Manuel Fajardo university hospital from January 2001 through January 2013, participated in the study. Their diagnosis was based on clinical examination and imaging, with additional pleural fluid study. After the sample-taking, a collecting catheter and an instilled sclerosing solution were used to remove the whole pleural content, whereas bleomycin, tetracycline, amoxicillin and povidone iodine acted as irritating agents. Results: the most frequent cause of pleural effusion was breast cancer, followed by lung and ovary cancers. The lung cancer was commonest in men and breast cancer in females. Females and the age of 60 years prevailed. In this group, 52.4 percent required two therapeutic sessions and 15.6 percent showed no relapse after the first session. Conclusions: the results were similar with all the used substances. The palliative intervention succeeded in improving the quality of life, releasing symptoms and reducing hospitalization(AU)

Etiology of pleural effusions: analysis of more than 3,000 consecutive thoracenteses.

OBJECTIVE: To investigate the etiology of pleural effusions (PE) in adults and the accuracy of pleural fluid (PF) cytology and cultures in malignant and infectious PE, respectively. PATIENTS AND METHODS: Retrospective analysis of all consecutive patients with PE undergoing diagnostic thoracentesis during the last 19 years in a university hospital. RESULTS: The leading causes of PE among the 3,077 patients were: cancer (27%), heart failure (21%), pneumonia (19%), tuberculosis (9%), abdominal surgery (4%), pericardial diseases (4%) and cirrhosis (3%). Tuberculosis was the most common etiology in patients <34 years of age (52%), whereas heart failure predominated in octogenarians (45%). The most common primary tumors in malignant PE were lung (37%) and breast (16%). The overall accuracy of PF cytology was 59%, although it was significantly lower in mesotheliomas (27%) and squamous cell lung cancer (25%). In infectious PE, only 30% of cultures yielded positive results, a percentage which increased two-fold (66%) in purulent fluids (empyemas). Viridans streptococci were the most commonly isolated pathogens (25.5%). The sensitivity of solid media cultures of PF for Mycobacterium tuberculosis was low (18.5%). CONCLUSIONS: Three-quarters of patients with PE in whom a diagnostic thoracentesis was indicated had cancer, heart failure, pneumonia or tuberculosis. PF cytology and cultures give false negative results in a significant number of cases.

Derrame pleural: [revisión] / Pleural effusion: [review]

El derrame pleural se define como la acumulación anormal de líquido en el espacio pleural; no es una enfermedad, es el resultado del desequilibrio entre la formación y la reabsorción del líquido como manifestación de alguna condición que incluso puede amenazar la vida del paciente. Es una entidad a la cual el clínico se ve enfrentado con frecuencia, la mayoría de las veces es secundaria a enfermedad pleural o pulmonar, pero puede también ser causada por enfermedades extrapulmonares, sistémicas o neoplásicas (bien sea primarias o metastásicas)...