Chemical Pleurodesis in the Treatment of Recurrent Chylothorax Due to Renal Cell Carcinoma.

Chylothorax is defined as a pleural effusion with triglyceride levels greater than 110 mg/dL and/or chylomicrons present in the pleural fluid. A chylothorax may be classified as traumatic or nontraumatic, with malignancy being the most common cause of atraumatic chylothoraces. Herein, we present the case of a 63-year-old woman with a past medical history of a mediastinal teratoma and stage III colon adenocarcinoma who presented to the emergency room with new-onset shortness of breath. A week prior to presentation, she was diagnosed with metastatic renal cell carcinoma after a retrocrural lymph node was biopsied. In the emergency department, a chest X-ray revealed a large right-sided pleural effusion, which was later diagnosed as a chylothorax based on pleural fluid analysis. Thoracentesis was performed and the patient was sent home. Three days later, the patient returned after experiencing palpitations and shortness of breath. The patient was diagnosed with recurrent chylothorax after a repeat chest X-ray and thoracentesis. The patient was ultimately treated with chemical pleurodesis. To the best of our knowledge, this case is the only reported chylothorax due to renal cell carcinoma metastasis reported in the literature. It describes the presentation and subsequent successful treatment of this rare condition with chemical pleurodesis.

Evaluation and management of persistent air leak.

INTRODUCTION: Persistent air leaks (PAL) represent a challenging clinical problem for which there is not a clear consensus to guide optimal management. PAL is associated with significant morbidity, mortality, and increased length of hospital stay. There are a variety of surgical and non-surgical management options available. AREAS COVERED: This narrative review describes the current evidence for PAL management including surgical approach, autologous blood patch pleurodesis, chemical pleurodesis, endobronchial valves, and one-way valves. Additionally, emerging topics such as drainage-dependent air leak and intensive care unit management are described. EXPERT OPINION: There has been considerable progress in understanding the pathophysiology of PAL and growing evidence to support the various non-surgical treatment modalities. Increased recognition of drainage-dependent persistent air leaks offers the opportunity to decrease the number of patients requiring additional invasive treatment. Randomized control trials are needed to guide optimal management.

Hypertonic glucose pleurodesis for preterm neonates with chylothorax.

Chylothorax is a known complication of postcardiac surgery and the most common cause of pleural effusion in neonates. Conservative management is usually adopted, including Nil-per-Oral (NPO), treatment of underlying etiology of infection, and use of octreotide. Chylothorax resistant to medical therapy and drainage is often treated by chemical pleurodesis. Previously used pleurodesis agents have included talc, minocycline, OK-432, bleomycin, and povidone-iodine. 50% Dextrose (D50) has been reported to be useful for pleurodesis in adults. We successfully managed two cases of prematurely born infants with D50 as an alternative chemical sclerosant for chemical pleurodesis in a resistant chylothorax and discussed evidence of its use in the literature.

Intraoperative OK-432 pleurodesis for preventing recurrence of primary spontaneous pneumothorax in children and adolescents: a single-center experience.

BACKGROUND: Primary spontaneous pneumothorax (PSP) commonly occurs in lean, tall, male children and adolescents. To reduce recurrence rates of PSP, chemical pleurodesis could be helpful for patients undergoing video-assisted thoracoscopic surgery (VATS) wedge bullectomy. The efficacy and safety of intraoperative OK-432 (Picibanil) pleurodesis on preventing the recurrence of PSP in pediatric patients remain unclear. METHODS: It is a retrospective observational study in a single center, between 2014 and 2020, enrolled 48 (8 females) pediatric PSP patients with persistent air leakage at the mean age of 16.3 ± 1.1 years to receive VATS wedge bullectomy and pleural abrasion. Twenty patients received additional intraoperative OK-432 pleurodesis. The clinical characteristics of patients, surgical outcomes, and recurrence rates were analyzed. RESULTS: The OK-432 group had longer operation time (118.6 ± 35.6 vs. 96.5 ± 23.3 min; p < 0.05) and higher proportion of postoperative fever (75.0% vs. 28.5%; p = 0.015) than the standard group. No serious adverse events were noted and other surgical outcomes in the two groups were comparable. After a mean follow-up period of 18.1 ± 19.1 months, the OK-432 group had a lower recurrence rate compared with the standard group (5% vs. 28.6%; p < 0.05, odds ratio 0.13, 95% confidence interval: 0.01-1.15), but it had no significant difference in statistics on the Kaplan-Meier curves (log-rank p = 0.105). CONCLUSION: It was the first study that focused on the addition of intraoperative OK-432 pleurodesis for PSP with persistent air leakage in children and adolescents receiving VATS. It demonstrated the efficacy with a low recurrence rate and short-term safety as a single-center experience. LEVEL OF EVIDENCE: Retrospective review, therapeutic study, Level III.

Chylothorax After Schwannoma Resection.

Schwannomas are tumors derived from Schwann cells of the peripheral nerve sheath that are usually benign; nonetheless, they can cause significant morbidity. When indicated, surgical resection is the gold standard of treatment for schwannomas. However, chylothorax is a rare postoperative complication of thoracic surgery. We present a case of chylothorax after thoracic schwannoma resection. A 61-year-old woman underwent a computed tomography (CT) scan for suspected nephrolithiasis, which instead found a right mediastinal mass that was confirmed to have features consistent with a schwannoma on thoracic spine magnetic resonance imaging (MRI). Right thoracotomy and schwannoma resection were performed, resulting in the complete removal of the schwannoma without capsular invasion. Two chest tubes were also inserted. On postoperative day 1 (POD1), the patient presented with a chylothorax that was initially treated with chest tube suctioning and total parenteral nutrition (TPN). However, a repeat right thoracotomy with thoracic duct ligation and dry talc chemical pleurodesis was subsequently performed on POD15 due to a lack of clinical improvement, which saw the resolution of the chylothorax without recurrence. Chylothorax is a rare but severe postoperative complication of thoracic surgeries, including those that involve tumor resections. We present a case of chylothorax after thoracic schwannoma resection that initially failed conservative management but eventually resolved after thoracic duct ligation and chemical pleurodesis. This case highlights the need for effective non-surgical treatments for chylothorax, the importance of remaining vigilant for rare postoperative complications, and the need for randomized controlled trials (RCTs) to develop a standardized chylothorax management algorithm.

Successful ventricular tachycardia radioablation in a patient with previous chemical pleurodesis: A case report.

Introduction: Stereotactic arrhythmia radioablation (STAR) is a novel technique for the ablation of ventricular tachycardia in patients with contraindications to standard procedures, i.e., radiofrequency ablation. Case presentation: We report the case of a 73-year-old man with non-ischemic dilated cardiomyopathy and recurrent VT episodes. Electroanatomic mapping showed VT prevalently of epicardial origin, but direct epicardial access through subxyphoid puncture could not be performed due to pleuropericardial adhesions from a past history of chemical pleurodesis. STAR was performed, with no VT recurrence at 6 months follow-up. Conclusions: Previous experiences with STAR have demonstrated its importance in the management of patients with refractory VT in whom other ablation strategies were not successful. Our case report highlights the use of STAR as a second choice in a patient with an unfavorable VT anatomical location and technical limitations to an optimal radiofrequency ablation. Moreover, it confirms STAR's effectiveness in the ablation of complex transmural lesions, which are more often associated with non-ischemic structural heart disease.

Effect of Minocycline Pleurodesis in Infants With Refractory Chylothorax After Palliative Surgery for Complex Congenital Heart Disease.

Chylothorax is a critical complication after surgery for congenital heart disease, which markedly compromises the postoperative course with increased mortality. As the cardiovascular load additively causes stagnation of the thoracic duct, chylothorax after palliative cardiac surgery can be highly refractory to the therapies. Here we report a case of two patients with refractory chylothorax attributed to hemodynamic load which was successfully treated with minocycline pleurodesis. In combination with congenital heart disease, extremely low birth weight coupled with prematurity in case 1 and venous obstruction with excessive volume load due to additional aortopulmonary shunt in case 2 additively increased resistance to the therapies, including fasting with total parenteral nutrition (TPN), XIII factor supplementation, octreotide infusion, as well as the use of steroids. As pleural effusion was sustained at more than 50 ml/kg/day, the condition of both patients deteriorated severely; pleurodesis using minocycline was urgently introduced. Pleural effusion declined at every session and both cases were in remission in a few sessions without unfavorable acute reaction. No symptoms suspecting chronic adverse effects were observed during follow-up, including respiratory dysfunction, pulmonary hypertension, tooth staining, or abnormal bone mineralization. Although the application of minocycline for children should be minimized, minocycline pleurodesis can be an option for patients with refractory and life-threatening chylothorax.

Risk factors for recurrent spontaneous pneumothorax: A population level analysis.

BACKGROUND: We sought to determine the rate and risk factors of recurrent spontaneous pneumothorax in a diverse population. METHODS: Cohort study using the California Public Discharge Data file (1995-2010). We identified patients with first-time spontaneous pneumothorax. The primary outcome was recurrent pneumothorax. Associations with clinical, patient, and hospital characteristics were assessed using Cox regression analysis. RESULTS: Among 14,609 patients with a first-time episode of spontaneous pneumothorax, 26.2% developed a recurrence. Risk factors included age <35 (Hazard Ratio [HR] 1.24 95%-Confidence Interval [CI] 1.14-1.36), Asian race (HR 1.24, CI 1.13-1.37), and tube thoracostomy (HR 1.2, CI 1.15-1.31). Mechancial pleurodesis (HR 0.37 CI 0.31-0.45) was superior to chemical pleurodesis (HR 0.71 CI 0.58-0.86) in reducing recurrence risk. CONCLUSIONS: The risk of recurrent pneumothorax is greatest in patients age <35, Asians, and those requiring a tube thoracostomy. The risks of operative intervention should be balanced against patient risk for recurrence.

A multidirectional two-tube method for chemical pleurodesis could improve distribution of the sclerosing agent within the pleural cavity - A pilot study.

INTRODUCTION: Malignant pleural effusion (MPE) affects approximately 200,000 people in the United States per annum. Chemical pleurodesis is a recommended first line treatment in the management of MPE, however, success rates as low as 43% has been reported. A bedside chemical pleurodesis can cost up to $11,224 and an estimated inpatient annual expenditure of more than $5 billion in the US alone. This study aims to assess the distribution of the talc slurry within the pleural space using human cadaveric models and to determine the force required to push the talc slurry though a 14 Fr chest tube. MATERIALS AND METHODS: The force required to administer the talc slurry through a 14 Fr chest tube was tested using a Zwick/Roelle Z005 mechanical tester, using a porcine thoracic biomodel. Talc slurry distribution within the pleural cavity was assessed by direct visualisation following administration to the human cadaveric models using single and multidirectional two-tube methods. RESULTS: Maximum force required to push the talc slurry through a 14 Fr chest tube was 11.36 N ± 2.79 N. Distribution of the talc slurry within the pleural cavity was found to be poor with a single tube method. Multidirectional two-tube method of administration showed more even distribution. CONCLUSION: The experimental multidirectional two-tube method results in wider distribution of the talc slurry within the pleural cavity and could further improve success rate of the talc pleurodesis.

The comparison of pleurodesis effects of iodopovidone at different concentrations and magnesium silicate: An experimental study.

BACKGROUND: This experimental study aims to investigate the pleurodesis effects of iodopovidone at different concentrations (2% and 4%) and sterile talc in a rat model. METHODS: Forty male Wistar Albino rats were randomly divided into four equal groups including 10 rats in each group. Groups 1, 2, and 3 were designed as the study, and Group 4 as the control group. In Group 1, 4 g sterile talc was given in the slurry form at 20 mL 0.9% saline solution, in Group 2 and Group 3 10% iodopovidone solution were given at 4% and 2% concentrations, respectively, and in Group 4, 0.9% saline was only administrated as 3 mL into the pleural space. All rats were sacrificed on Day 30 and evaluated for macroscopic and microscopic examination. Microscopic evaluation was performed for alveolar collapse, alveolar hemorrhage, alveolar infiltration and fibrosis. Brain, liver, and kidney tissues were also examined. RESULTS: Iodopovidone macroscopically caused a significant adhesion similar to sterile talc at a concentration of 4%. The pleurodesis effect of iodopovidone at a concentration of 4% was significantly similar to talc, when microscopic parameters were evaluated. Granulomas due to sterile talc were observed in the opposite hemithorax. Brain, liver, and kidney examinations revealed no systemic distribution for both agents. CONCLUSION: Iodopovidone is a powerful alternative to sterile talc with its easy accessibility and low cost. In this study, 4% iodopovidone was found to provide effective and safe pleurodesis in rats. We believe that the use of this concentration in clinical studies would provide more effective results.

Talc pleurodesis in malignant pleural effusion: a systematic review and meta-analysis.

OBJECTIVE: Malignant pleural effusion is a severe and common complication in patients with primary or metastatic malignancies of the pleura. Although talc pleurodesis is widely used for managing malignant pleural effusions, there is still controversy in the literature regarding its superiority compared to other approaches. We conducted this meta-analysis to further investigate its efficacy compared to alternative interventions. METHODS: We systematically reviewed the PubMed, Cochrane, and Scopus databases to identify studies that fulfilled our inclusion criteria. Study quality was evaluated using validated tools and the pooled Risk Ratio (RR) and confidence interval (CI) were calculated. We performed sensitivity analyses based on the meta-analysis method and type of study. RESULTS: Twenty-four studies were included in the current systematic review meta-analysis. Talc pleurodesis was associated with statistically significant higher successful pleurodesis rates when compared with all controls [RR (95% CI) 1.15 (1.00, 1.31); Pz = 0.04], only chemical controls [RR (95% CI) 1.26 (1.13, 1.40); Pz < 0.0001], and bleomycin [RR (95% CI) 1.22 (1.05, 1.42); Pz = 0.008]. The comparison between talc pleurodesis and controls at the > 1-month follow-up time point favored talc pleurodesis [RR (95% CI): 1.62 (1.15, 2.27); Pz = 0.005]. Finally, talc poudrage was associated with a statistically significant higher successful pleurodesis rate when compared with all controls. Sensitivity analyses verified the robustness of our results. CONCLUSION: Talc pleurodesis is an effective MPE management approach presenting borderline statistically significant superiority compared to control methods especially compared to bleomycin as well as when pleurodesis success is evaluated later than 1 month postoperatively.

Uso de bleomicina en el manejo del derrame pleural recidivante maligno / Bleomycin in the management of malignant recurrent pleural effusion

Introducción: El derrame pleural recidivante maligno se reproduce en breve tiempo y requiere el diagnóstico etiológico positivo de malignidad, la etiología más frecuente es el cáncer de pulmón. La pleurodesis química es el tratamiento de elección con la aplicación intrapleural de sustancias sinfisiantes. Objetivo: Describir la respuesta clínica y radiológica de los enfermos con derrame pleural recidivante maligno con el uso de bleomicina. Método: Estudio observacional comparativo en 30 pacientes con derrame pleural recidivante maligno divididos en dos grupos, en uno se aplicó la bleomicina intrapleural y al otro yodo povidona. Resultado: El 33,3 por ciento fueron del sexo masculino, 60 por ciento perteneció al grupo de edades de 60-69 años. El grupo tratado con bleomicina presentó una respuesta clínica favorable en los síntomas, p<0,005 después de la pleurodesis. En la evaluación de la respuesta radiológica, 66,6 por ciento pacientes tratados con la bleomicina tuvieron una resolución completa. Conclusiones: Se logró una buena respuesta clínica-radiológica con la pleurodesis química similar entre ambas modalidades de tratamiento. Se obtuvieron mejores resultados y menos reacciones adversas con la bleomicina intrapleural(AU)

Introduction: The malignant recurrent pleural effusion reproduces in short time and it requires a positive etiological diagnosis of malignancy, the most frequent etiology is lung cancer. Chemical pleurodesis is the treatment of choice with the intrapleural application of symphysiating substances. Objective: To describe the clinical and radiological response of patients with malignant recurrent pleural effusion with the use of bleomycin. Method: A comparative observational study in 30 patients with recurrent malignant pleural effusion was carried out. They were divided into two groups, one used intrapleural bleomycin and the other group used povidone iodine. Result: 33.3 percent were male, 60 percent belonged to the 60-69 age group. The group treated with bleomycin presented favorable clinical response in symptoms, p <0.005 after pleurodesis. At the evaluation of the radiological response, 66.6 percent patients treated with bleomycin had a complete resolution. Conclusions: Good clinical-radiological response was achieved with similar chemical pleurodesis between both treatment modalities. Better results and fewer adverse reactions were obtained with intrapleural bleomycin(AU)

Viscum pleurodesis is as effective as talc pleurodesis and tends to have less adverse effect.

PURPOSE: Many patients diagnosed with advanced cancer have malignant pleural effusion that does not respond to chemotherapy or radiation therapy. These patients often have respiratory symptoms, especially dyspnea. In order to relieve these symptoms, various procedures including chemical pleurodesis have been performed. Although talc is the most widely used and effective sclerosing agent, there it has various adverse effects. The objective of this study was to determine whether Viscum (ABNOVA Viscum® Fraxini Injection, manufactured by ABNOVA GmbH, Germany) could be used as an agent to replace talc in clinical practice. METHODS: Data of 56 patients with malignant pleural effusion who received chemical pleurodesis after tube thoracostomy from January 2003 to December 2017 were retrospectively reviewed to analyze clinical course and response after pleurodesis with each agent. RESULTS: After pleurodesis, changes in numeric rating scale (NRS) was 1.4 ± 1.6 in the talc group and 0.5 ± 1.5 in the Viscum group (p = 0.108). Changes in white blood cell counts after pleurodesis were 4154.8 ± 6710.7 in the talc group and 3487.3 ± 6067.7 in the Viscum group (p = 0.702). Changes in C-reactive protein (CRP) were 9.03 ± 6.86 in the talc group and 6.3 ± 7.5 in the Viscum group (p = 0.366). The success rate of pleurodesis was 93.3% in the talc group and 96% in the Viscum group (p = 0.225). CONCLUSION: Viscum pleurodesis showed comparable treatment results with talc pleurodesis while its adverse effects such as chest pain and fever tended to be relatively weak.

First successful case of chemical pleurodesis with oxytetracycline through Rocket® Pleural Vent™: ambulatory pneumothorax device for pneumothorax.

A 79-year-old woman with asthma and idiopathic pulmonary fibrosis was admitted for a first episode right apical secondary spontaneous pneumothorax. Due to a lack of pleural separation inside the safety triangle, Rocket® Pleural Vent™ was inserted in the second intercostal space, mid-clavicular line, as guided by thoracic ultrasound. Although the lung fully re-expanded the next day, there was persistent air leak and so chemical pleurodesis with oxytetracycline was performed with success. There was no recurrence of pneumothorax and the patient was discharged two days afterwards, and a follow-up X-ray taken eight months later did not reveal any recurrence of the right-sided pneumothorax. This is the first reported case of successful chemical pleurodesis through Rocket® Pleural Vent™ for pneumothorax, which may serve to provide additional alternatives to the management of secondary spontaneous pneumothorax that is indicated for pleurodesis after lung re-expansion.

Chemical pleurodesis with autologous blood and freeze-dried concentrated human thrombin improved spontaneous pneumothorax and thoracic endometriosis: The first case involving a pregnant woman.

OBJECTIVE: Spontaneous pneumothorax combined with thoracic endometriosis is a rare condition during pregnancy. We present a case of chemical pleurodesis with autologous blood and freeze-dried concentrated human thrombin during pregnancy. CASE REPORT: This report presents a case of spontaneous pneumothorax combined with thoracic endometriosis that arose at 22 weeks' gestation in a 35-year-old female. The initial chest drainage was unsuccessful. At 25 weeks' gestation, video-assisted thoracoscopic surgery was performed and revealed endometriosis in the thoracic cavity. Since the leak persisted, chemical pleurodesis was performed with autologous blood and freeze-dried concentrated human thrombin at 28 weeks' gestation. The leak improved markedly and did not recur. CONCLUSION: This is the first case report about chemical pleurodesis with autologous blood and freeze-dried concentrated human thrombin during pregnancy. This procedure might contribute to the management of pneumothorax in pregnant women.

The management of chemical pleurodesis with viscum album in patients with persistent air leakage.

BACKGROUND: Persistent air leak (PAL) after major pulmonary resection or involved with secondary lung disease is prevalent and associated with significant morbidity. Chemical pleurodesis is a practical therapeutic tool to manage the patients with PAL. Among various sclerosing substances, viscum album (fraxini) is considered effective and safe. The aim of this study was to evaluate the efficacy and safety of viscum album pleurodesis in patients with intractable prolonged air leakage. METHODS: Between February 2013 and February 2015, 73 consecutive patients who underwent pleurodesis due to PAL were enrolled in this study. Pleurodesis was performed using 100 mg of viscum album (fraxini) at 1 time through the indwelling chest tube. Main studied outcomes were focused on success rate of pleurodesis assessed on chest radiography and cessation of the air leak after procedure. RESULTS: The study population was predominantly male (n=64, 87.7%). The overall success rate was 90.4%. One patient died of pneumonia not related to the viscum album pleurodesis. The mean length of stoppage to air leakage was 28.00±22.19 hours. The mean duration of chest tube drainage after pleurodesis was 2.78±1.35 days. The mean number of pleurodesis was 1.38±0.75. Thirty-six patients (49.3%) complained of chest pain requiring a prescription for pain control. There were no major relevant complications or mortalities. CONCLUSIONS: Air leaks remain an important cause of morbidity. This viscum album pleurodesis could be considered as an option for the treatment of prolonged air leak patients, associated with acceptable side effects.

Outcome of pleurodesis using different agents in management prolonged air leakage following lung resection.

BACKGROUND AND AIMS: Prolonged air leaks (PAL) are a common problem after pulmonary resection. PAL can be a source of significant complications. One of the treatment options is chemical pleurodesis. MATERIAL AND METHODS: The efficiency of three methods of treatment of PAL after lung resection was evaluated. In Iodine_ group aqueous iodine solution (lat.Tinctura Jodi) was applied intrapleurally (30 patients); in Doxycycline_group (34 patients) 200 mg of Doxycyclin was given and in Drainage_group 35 patients were applied Lidocaine solution only. RESULTS: The group investigated was similar with regard to age [F = 0.04, P = 0.96] and the amount of air leakage (approx. 462 mL/min). The shortest drainage time and hospital stay was observed in the Iodine_group [10.57, P < 0.001]. However, this therapy was connected with strongly perceptible chest pain (P < 0.0001]). The number of case of pneumothorax recurrence was low and it was the same was seen in other methods of treatment [F = 0.87, P = 0.42]. Allergic reactions were not observed. The number of episodes of tachycardia, hypotension, dyspnea, pneumonia, subcutaneus empyema, fluid collection, emphysema, pneumothorax recurrence and number of re-thoracotomies were statistically similar in all three methods of treatment. CONCLUSION: Iodine pleurodesis can be considered as one of possible treatment methods of PAL after lung resection as it showed favorable results compared with Doxycycline pleurodesis or drainage alone regarding duration of air leakage, hospitalization and pneumothorax recurrence with only slightly increased pleural pain.

Is it possible to standardize the treatment of primary spontaneous pneumothorax? Part 1: etiology, symptoms, diagnostics, minimally invasive treatment.

The authors of this report present the history of primary spontaneous pneumothorax (PSP) treatment, its etiology, clinical symptoms, and diagnostic methodology. Further, they discuss minimally invasive methods of treating PSP such as thoracentesis and chemical pleurodesis. They discuss the pros and cons of each method, emphasizing that, according to the international recommendations, they should be used as the first line of treatment for PSP.

Pleurodesis with povidone-iodine for refractory chylothorax in newborns: Personal experience and literature review.

INTRODUCTION: Refractory chylothorax is a severe clinical issue, particularly in neonates. Conventional primary approach is based on diet with medium-chain fatty acids and/or total parenteral nutrition. In nonresponders, proposed second line treatments include chemical or surgical pleurodesis, thoracic duct ligation, pleuroperitoneal shunting and pleurectomy but none of these have been shown to be superior to other in terms of resolution rate and safety. Our aim is to report our experience on povidone-iodine use for chemical pleurodesis in newborn infants with chylothorax unresponsive to conservative treatment. Our aim is to report our experience on povidone-iodine use for chemical pleurodesis in newborn infants with chylothorax unresponsive to conservative treatment. METHODS: Since 2013, povidone-iodine pleurodesis was attempted in all patients with persistent chylothorax who failed conservative treatment (no response to at least 10 days of total parenteral nutrition and maximum dosage of intravenous octreotide). Pleurodesis consisted in the injection of 2 ml/kg of a 4% povidone-iodine solution inside the pleural space, leaving the pleural tube clamped for the subsequent 4 hours. RESULTS: Five patients were treated with chemical pleurodesis of persistent chylothorax. Four of 5 patients had their pleural effusion treated by one single povidone-iodine infusion. Median time for resolution was 4 days. A patient with massive superior vena cava thrombosis did not benefit from pleurodesis. None of the patients experienced long term side effects of the treatment. CONCLUSION: Our data suggest that povidone-iodine pleurodesis may be considered a safe and effective option to treat refractory chylothorax in newborns.

Efficacy of mistletoe for chemical pleurodesis in rats without malignancy.

Chemical pleurodesis is an effective treatment modality to reduce recurrence of malignant effusion. Several agents have been used in chemical pleurodesis but, it is not yet clear which is better. Eighteen Sprague-Dawley rats were used and classified into three groups: a group intrapleurally injected normal saline (group A, n=6), 400mg/kg talc (group B, n=6), and 9mg/kg mistletoe extraction (ME) (group C, n=6). Autopsy was performed to evaluate the pleural adhesion, pathologic examination of pleura and lung and bronchoalveolar lavage fluid analysis 4 weeks after pleurodesis. Both group B and C showed an obvious pleural adhesion and there was no significant difference in grade of pleural adhesion between two groups (p=0.58). The parietal pleural thickness in talc group than ME group was significantly thicker (p=0.002) and the visceral pleura of talc group showed marked foreign body reaction with fibrosis and many multinucleated giant cells associated with talc crystal. This study suggests that pleurodesis using ME in condition without malignancy has comparable effect to pleurodesis using talc. However, additional experimental study in large animal or clinical trials would be required to prove a safety and an efficacy of pleurodesis using ME.