{ "schemaVersion": 2, "eyebrow": "Pulmonology", "title": "Parapneumonic Effusion Drainage Criteria", "summary": "Drain parapneumonic effusions when pleural fluid is purulent, microbiologically positive, markedly acidotic, or anatomically large or loculated. Use immediate blood-gas pH measurement after diagnostic thoracentesis to distinguish patients likely to resolve with antibiotics from those requiring image-guided tube drainage and escalation.", "seoDescription": "Pleural fluid pH, glucose, microbiology, and imaging criteria that determine when parapneumonic effusions require chest tube drainage.", "clinicalQuestion": "Which clinical, imaging, and pleural fluid findings require drainage of a parapneumonic effusion?", "specialty": "Pulmonary and Critical Care Medicine", "audience": "U.S. physicians and medical trainees", "tags": [ "parapneumonic effusion", "complicated parapneumonic effusion", "empyema", "pleural fluid pH", "chest tube drainage", "intrapleural tPA DNase" ], "keyTakeaways": [ "Frank pus or organisms on pleural-fluid Gram stain or culture establishes pleural infection and requires formal pleural drainage. [11]", "If aspiration is not purulent, measure pleural-fluid pH immediately; pH ≤7.15 indicates high risk of complicated parapneumonic effusion and supports intercostal drainage. [2]", "For pleural-fluid pH 7.16-7.38, drainage risk declines as pH rises, particularly above 7.22; integrate glucose, LDH, imaging, and the clinical course rather than using one borderline result alone. [2]", "Loculation on ultrasound or chest radiography and a large collection increase the likelihood of drainage failure and support early tube drainage. [10][12]", "After inadequate tube drainage with residual infected collection, combined intrapleural alteplase 10 mg plus DNase 5 mg twice daily for 3 days is an evidence-based rescue approach; persistent sepsis or inadequate source control requires procedural escalation. [22][23][24]" ], "sections": [ { "id": "drain-now", "eyebrow": "Immediate decision", "heading": "Findings that mandate pleural drainage", "intro": "Treat pneumonia and achieve pleural source control in parallel.", "paragraphs": [ "Proceed to image-guided intercostal drainage when diagnostic thoracentesis yields frankly purulent fluid or when pleural-fluid Gram stain or culture identifies organisms. These findings define infected pleural fluid that is not expected to resolve with antibiotics alone. [11]", "Drain a nonpurulent parapneumonic effusion when pleural-fluid pH is <7.20 in an appropriate infectious presentation. A pleural glucose <60 mg/dL and LDH >1,000 IU/L are corroborating markers of complicated infection, but pH is the preferred initial biochemical discriminator. [11][12][18]", "Do not rely on biochemical thresholds to defer drainage when imaging shows a large effusion or loculations, or when the patient has ongoing sepsis with a pleural collection. Radiographic size and loculation are guideline-recognized features of complicated parapneumonic effusion and are associated with poorer outcomes after tube thoracostomy. [10][12]" ], "bullets": [ "Frank pus: insert a pleural drain; do not await culture results. [11]", "Positive Gram stain or culture: drain the pleural space even if fluid is not grossly purulent. [11]", "pH <7.20: manage as a complicated parapneumonic effusion and drain, provided the clinical context is pleural infection. [11][12]", "Loculated or large effusion: favor early image-guided tube drainage, especially with persistent fever, inflammatory markers, or respiratory compromise. [10][12]" ], "subsections": [], "table": { "caption": "Drainage triggers in suspected parapneumonic pleural infection. [2][10][11][12]", "columns": [ "Finding at aspiration or imaging", "Interpretation", "Next action" ], "rows": [ [ "Frankly purulent pleural fluid [11]", "Empyema / infected pleural space [11]", "Insert image-guided intercostal drain. [11]" ], [ "Positive Gram stain or pleural-fluid culture [11]", "Microbiologically proven pleural infection [11]", "Drain the infected collection. [11]" ], [ "Pleural-fluid pH ≤7.15 [2]", "High likelihood of complicated course [2]", "Intercostal drainage is indicated. [2]" ], [ "Pleural-fluid pH 7.16-7.21 [2]", "Meaningful risk of complicated pleural infection [2]", "Use glucose, LDH, imaging, and clinical trajectory to determine drainage; favor drainage when additional adverse features are present. [2][12]" ], [ "Pleural-fluid pH 7.22-7.38 [2]", "Risk decreases as pH rises, especially above 7.22 [2]", "Do not drain solely for pH; assess for loculation, size, microbiology, and clinical deterioration. [2][12]" ], [ "Pleural-fluid pH >7.38 [2]", "Very low risk of complicated parapneumonic effusion [2]", "Antibiotics and clinical-radiographic follow-up are generally appropriate unless another drainage trigger is present. [2]" ], [ "Loculation or a large pleural collection [10][12]", "Impaired spontaneous or catheter drainage; increased risk of poor outcome [10]", "Arrange image-guided chest drainage early. [10][12]" ] ] } }, { "id": "diagnostic-aspiration", "eyebrow": "Thoracentesis", "heading": "Obtain pleural-fluid results that change the drainage decision", "intro": "Sample pleural fluid promptly when pneumonia is accompanied by a clinically significant effusion.", "paragraphs": [ "Use thoracic ultrasonography before aspiration or drain placement to confirm fluid, estimate volume, distinguish free-flowing from loculated fluid, assess echogenicity, and select a safe drainage site. Ultrasound is particularly useful when chest radiography shows hemithorax opacification and can be performed at the bedside. [1]", "If fluid is not pus, collect pleural fluid for immediate pH measurement in an appropriate blood-gas syringe without air contamination and analyze it promptly on a point-of-care blood-gas analyzer. Delayed analysis or air exposure can make pH unreliable and can misclassify a patient near the drainage threshold. [2][9]", "Send Gram stain and culture with pH, glucose, and LDH. Culture sensitivity is limited: standard microbiologic practice identified plausible organisms in only 16% to 19% of pleural infections in reported cohorts, so a negative culture does not override purulence, low pH, loculation, or a deteriorating clinical course. [9]" ], "bullets": [ "Use pH as the primary biochemical drainage test when fluid is not purulent. [2][18]", "If an immediate accurate pH is unavailable, pleural glucose 4.0 mmol/L or lower in a nondiabetic patient indicates a moderate-to-high likelihood of complicated parapneumonic effusion. [2]", "Interpret glucose cautiously in diabetes because severe hyperglycemia can leave pleural-fluid glucose above usual drainage cutoffs despite pleural infection. [12]", "A normal pH does not categorically exclude infection; rare Proteus mirabilis empyema may have an elevated pleural-fluid pH. [11]" ], "subsections": [ { "heading": "How to interpret borderline biochemistry", "paragraphs": [ "For pH 7.16-7.38, do not use a single cutoff mechanically. The probability of complicated parapneumonic effusion falls with increasing pH, especially once pH exceeds 7.22, while pleural glucose and LDH are less accurate than pH as independent initial predictors. [2]" ], "bullets": [ "Pleural glucose <35 mg/dL and LDH >1,000 IU/L support complicated infection when pH is unavailable, questionable, or borderline. [11]", "Pleural CRP >100 mg/L or serum CRP >200 mg/L may improve prediction when combined with pH or glucose, but other proposed pleural biomarkers remain investigational. [12]" ] } ], "table": { "caption": "Pleural-fluid testing and interpretation for drainage decisions. [2][9][11][12]", "columns": [ "Test", "Actionable result", "Clinical use" ], "rows": [ [ "Gross appearance [11]", "Frank pus [11]", "Diagnostic of empyema; drain immediately. [11]" ], [ "Gram stain or culture [11]", "Any organism detected [11]", "Confirms pleural infection and mandates drainage. [11]" ], [ "pH, measured immediately [2][9]", "≤7.15: high risk; >7.38: very low risk [2]", "Primary biochemical discriminator for intercostal drainage. [2]" ], [ "Glucose [2][11]", "≤4.0 mmol/L in nondiabetic patient; <35 mg/dL strongly supportive [2][11]", "Use when pH cannot be obtained accurately or as corroboration for a borderline pH. [2]" ], [ "LDH [11][12]", ">1,000 IU/L [11]", "Supports complicated infection but should not independently determine drainage. [12][18]" ] ] } }, { "id": "imaging-and-catheter", "eyebrow": "Procedure planning", "heading": "Use ultrasound to select drainage and CT to investigate failure or alternative pathology", "intro": "Imaging determines access, complexity, and the need to look beyond uncomplicated pleural infection.", "paragraphs": [ "Use thoracic ultrasound to map septations and locules and to guide thoracentesis or chest-drain insertion. Ultrasound identifies free versus loculated fluid and pleural thickening, but it does not reliably stage pleural infection; do not withhold drainage because ultrasound cannot distinguish fibrinopurulent from organizing disease. [1]", "Contrast-enhanced chest CT is most useful when initial aspiration fails, tube drainage is inadequate, medical management is failing, or an endobronchial obstruction, lung abscess, mediastinal process, or other parenchymal abnormality must be assessed. CT can delineate loculated fluid and pleural contrast enhancement may improve detection of complicated parapneumonic effusion. [1][2]", "A small-bore 10-14 F catheter is considered adequate for most complicated pleural infections in BTS guidance. If using a small-bore flexible catheter, flush with 20-30 mL saline every 6 hours to reduce obstruction risk. [5]" ], "bullets": [ "Choose the drain target with ultrasound rather than relying on chest radiography alone. [1]", "Obtain contrast-enhanced CT when persistent residual fluid or failure to improve raises concern for an undrained locule, abscess, or obstructing lesion. [1]", "Recognize that collections occupying >40% of the hemithorax may be more likely to require surgery. [10]" ], "subsections": [], "table": { "caption": "Imaging findings that alter drainage management. [1][2][10]", "columns": [ "Imaging result", "What it changes", "Action" ], "rows": [ [ "Free pleural fluid on ultrasound [1]", "Identifies an accessible target for aspiration or catheter placement [1]", "Perform ultrasound-guided diagnostic aspiration; drain if fluid or clinical criteria are met. [1][2][11]" ], [ "Septated or loculated fluid [1][10]", "Signals impaired drainage and poorer tube-thoracostomy outcome [10]", "Place image-guided drain; reassess promptly for residual locules and escalation. [1][10]" ], [ "Pleural contrast enhancement on CT [2]", "May improve detection of complicated parapneumonic effusion [2]", "Integrate with pleural-fluid findings and clinical sepsis when deciding to drain. [2]" ], [ "Failure of aspiration or medical management [1]", "Raises concern for inaccessible locule, abscess, obstruction, or alternative pathology [1]", "Obtain contrast-enhanced CT and plan additional drainage or procedural management. [1]" ] ] } }, { "id": "after-drain-placement", "eyebrow": "Source-control escalation", "heading": "Escalate when tube drainage leaves an infected residual collection", "intro": "A drain is not definitive source control unless the collection resolves and the patient improves.", "paragraphs": [ "After catheter placement, reassess drainage output, residual pleural collection on imaging, and clinical response. Persistent infected fluid due to loculations, septations, or viscous pus is a drainage failure pattern; approximately 30% of cases may be difficult to evacuate for these anatomic reasons. [21]", "When initial chest-tube drainage has ceased but an infected residual collection remains, consider combined intrapleural alteplase and DNase. The MIST-2 regimen was alteplase 10 mg plus DNase 5 mg, administered intrapleurally twice daily for 3 days, for 12 total instillations. Combination therapy improved drainage and has been used as rescue treatment after antibiotics and thoracostomy drainage fail to achieve adequate clearance. [22][23][24]", "Do not substitute single-agent fibrinolytic therapy for the combination regimen on the basis of the available comparative evidence. Combination tPA/DNase has a recognized bleeding risk, including pleural hemorrhage and hemoptysis; weigh this risk before use and involve procedural teams early when a patient has a persistent collection or cannot tolerate intrapleural therapy. [22]" ], "bullets": [ "Residual loculated collection after drain output stops: evaluate for intrapleural tPA/DNase or procedural clearance rather than simply leaving an ineffective catheter in place. [22][24]", "Persistent inadequate clearance despite drainage-based therapy: obtain surgical assessment for VATS drainage or decortication. [4][21]", "A large collection, multiloculation, or persistent sepsis should lower the threshold for early procedural escalation. [10][21]" ], "subsections": [ { "heading": "Role of surgery", "paragraphs": [ "VATS is an alternative source-control strategy for complex parapneumonic effusion and empyema, particularly when tube drainage with or without intrapleural therapy does not achieve clearance. Direct comparisons of first-line VATS with ultrasound-guided catheter drainage plus alteplase/DNase remain an active area of study, so the practical decision should prioritize timely clearance of persistent infected pleural space. [4][21]" ], "bullets": [ "Consider surgery early for inadequately drained multiloculated empyema; space deloculation is described at 1-2 weeks in this setting. [20]", "Decortication may be required for unresolved empyema or organizing pleural restriction; procedure-related harms include pain, recurrence, prolonged hospitalization, chest-organ injury, diaphragmatic paralysis, and rib fracture. [17][20]" ] } ], "table": { "caption": "Escalation after initial chest-tube drainage. [4][20][21][22][23][24]", "columns": [ "Post-drain finding", "Likely problem", "Escalation" ], "rows": [ [ "Output ceases with residual infected collection [22]", "Loculation, septation, or viscous fluid prevents evacuation [21]", "Consider intrapleural alteplase 10 mg plus DNase 5 mg twice daily for 3 days. [22][23]" ], [ "Persistent collection or clinical nonresponse after drainage-based therapy [4][21]", "Inadequate source control [21]", "Obtain thoracic surgical assessment for VATS drainage or decortication. [4][20]" ], [ "Large collection occupying >40% of hemithorax [10]", "Higher likelihood of needing surgery [10]", "Plan close reassessment and early procedural escalation if drainage is incomplete. [10]" ] ] } }, { "id": "avoid-misclassification", "eyebrow": "Exceptions", "heading": "Avoid common errors in deciding against drainage", "intro": "Low-risk biochemistry is reassuring only when the broader infectious assessment is concordant.", "paragraphs": [ "Do not classify every pneumonia-associated effusion as requiring a drain. Most sterile simple parapneumonic effusions resolve with antibiotic treatment alone; the drainage decision depends on evidence of pleural infection, adverse pleural-fluid chemistry, large volume, loculation, or failure to improve. [8][12]", "Do not use a negative culture to label a patient uncomplicated, and do not use a single low glucose value without context. Pleural cultures are frequently negative, glucose is affected by diabetes-related hyperglycemia, and pH remains the more accurate independent initial predictor of complicated parapneumonic effusion. [2][9][12][18]", "When pH is high but clinical concern remains substantial, re-evaluate sampling quality, ultrasound anatomy, and alternative explanations for the collection. Rare Proteus empyema can produce an elevated pH, while loculated fluid may require direct targeting of the relevant pocket for representative sampling and drainage planning. [1][11]" ], "bullets": [ "Antibiotics alone are reasonable only when there is no purulence, no microbiologic proof of pleural infection, no adverse biochemical or anatomic feature, and the patient improves clinically. [8][11][12]", "A pH >7.38 indicates very low risk of complicated parapneumonic effusion, not an absolute exclusion of pleural infection. [2][11]", "Use CT selectively for failed aspiration or failing medical management, not as a routine substitute for ultrasound-guided fluid sampling. [1]" ], "subsections": [], "table": { "caption": "Results that should not falsely reassure against drainage. [1][2][9][11][12]", "columns": [ "Potentially reassuring finding", "Why it can mislead", "Correct next step" ], "rows": [ [ "Negative pleural-fluid culture [9]", "Standard culture often fails to identify an organism in pleural infection. [9]", "Follow pH, appearance, imaging, and clinical course; drain if other criteria are met. [9][11][12]" ], [ "Pleural glucose above 60 mg/dL in diabetes [12]", "Hyperglycemia can elevate pleural glucose despite infection. [12]", "Prioritize immediate pH measurement and imaging findings. [2][12]" ], [ "Normal or elevated pH [11]", "Rare Proteus empyema may have elevated pH. [11]", "If purulence, microbiology, loculation, or sepsis persists, pursue drainage and source control. [11][12]" ], [ "CT unable to stage infection [1]", "CT and ultrasound do not reliably distinguish empyema from parapneumonic effusion stage. [1]", "Base drainage on fluid findings, loculation, collection size, and clinical trajectory. 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PMC", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11742517", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov" }, { "number": 23, "title": "Rethinking the Doses of Tissue Plasminogen Activator and Deoxyribonuclease Administrated Concurrently for Intrapleural Therapy for Complicated Pleural Effusion and Empyema", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6368361", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov" }, { "number": 24, "title": "Intrapleural Tissue Plasminogen Activator and Deoxyribonuclease for Pleural Infection. An Effective and Safe Alternative to Surgery", "detail": "www.atsjournals.org", "url": "https://www.atsjournals.org/doi/10.1513/AnnalsATS.201407-329OC", "authors": "www.atsjournals.org", "host": "www.atsjournals.org" } ], "editorialNote": "Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.", "citations": [ { "number": 1, "title": "BTS guidelines for the management of pleural infection in children", "detail": "thorax.bmj.com", "url": "https://thorax.bmj.com/content/60/suppl_1/i1", "authors": "thorax.bmj.com", "host": "thorax.bmj.com", "snippet": "Title: BTS guidelines for the management of pleural infection in children\nChest ultrasonography can detect the presence of fluid in the pleural space, so is particularly useful when there is a “white out” on the chest radiograph.6 Although ultrasound cannot reliably establish the stage of pleural in", "score": 0.586926 }, { "number": 2, "title": "Online Appendix C2 BTS Guideline for Pleural Disease ... - Thorax", "detail": "thorax.bmj.com", "url": "https://thorax.bmj.com/content/thoraxjnl/78/Suppl_3/s1/DC15/embed/inline-supplementary-material-15.pdf?download=true", "authors": "thorax.bmj.com", "host": "thorax.bmj.com", "snippet": "Evidence statements Pleural fluid pH appears to have a high specificity and high sensitivity for identifying patients who will undergo a complicated clinical course (complicated parapneumonic effusion (CPPE)) and thus require intercostal drainage (Ungraded) In the context of clinically suspected ple", "score": 0.7116118 }, { "number": 3, "title": "Improving patient pathways for the investigation of pleural effusions", "detail": "thorax.bmj.com", "url": "https://thorax.bmj.com/content/thoraxjnl/early/2020/03/26/thoraxjnl-2019-214309/DC1/embed/inline-supplementary-material-1.pdf?download=true", "authors": "thorax.bmj.com", "host": "thorax.bmj.com", "snippet": "Standardised Diagnostic criteria for pleural effusions (North Bristol Pleural Investigation Study (08/H0102/11). Malignant pleural fluid cytology or biopsy or b/. Radiological changes meeting Leung’s criteria [1] which have progressed in keeping with malignancy on interval CT scan in the correct cli", "score": 0.6580885 }, { "number": 4, "title": "Intrapleural fibrinolysis and DNase versus video-assisted thoracic surgery (VATS) for the treatment of pleural empyema (FIVERVATS): protocol for a randomised, controlled trial – surgery as first-line treatment", "detail": "bmjopen.bmj.com", "url": "https://bmjopen.bmj.com/content/12/3/e054236", "authors": "bmjopen.bmj.com", "host": "bmjopen.bmj.com", "snippet": "Title: Intrapleural fibrinolysis and DNase versus video-assisted thoracic surgery (VATS) for the treatment of pleural empyema (FIVERVATS): protocol for a randomised, controlled trial – surgery as first-line treatment\nImage 1Image 2Image 3# Intrapleural fibrinolysis and DNase versus video-assisted th", "score": 0.7089592 }, { "number": 5, "title": "Management of parapneumonic effusion and empyema : The Journal of Association of Chest Physicians", "detail": "journals.lww.com", "url": "https://journals.lww.com/ascp/Fulltext/2019/07020/Management_of_parapneumonic_effusion_and_empyema.1.aspx", "authors": "journals.lww.com", "host": "journals.lww.com", "snippet": "The initial management of most patients with complicated parapneumonic effusions has been intercostal chest tube drainage. Large (28–36 F) tubes have been recommended because of the belief that smaller tubes would become obstructed with the thick fluid. The British Thoracic Society (BTS) guidelines ", "score": 0.7451949 }, { "number": 6, "title": "Management of parapneumonic pleural effusion in adults - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S1579212915003158", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "### Chest\n\n### Intra-pleural fibrinolytic therapy for treatment of adult parapneumonic effusions and empyemas: a systematic review and meta-analysis\n\n### Chest\n\n### Video-assistedthoracoscopic surgery in the treatment of complicated parapneumonic effusions or empyemas: outcome of 234 patients\n\n### C", "score": 0.5863576 }, { "number": 7, "title": "Pharmacotherapy in complicated parapneumonic pleural effusions and thoracic empyema - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S1094553904001609", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "### Chest\n\n### Video-assisted evacuation of empyema is the preferred procedure for the management of pleural space infections\n\n### Am J Surg\n\n### Serial pleural fluid analysis in a new experimental model of empyema\n\n### Chest\n\n### Effects of streptokinase and deoxyribonuclease on viscosity of human ", "score": 0.5530473 }, { "number": 8, "title": "Parapneumonic Effusion - an overview | ScienceDirect Topics", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/topics/veterinary-science-and-veterinary-medicine/parapneumonic-effusion", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "Development of a sterile, exudative pleural effusion (simple parapneumonic effusion) is a common complication of bacterial pneumonia, and the majority of cases resolve with antibiotic treatment alone. A minority become secondarily infected (complex parapneumonic effusions), and require chest drainag", "score": 0.5052006 }, { "number": 9, "title": "Role of interventional pulmonology in the management of complicated parapneumonic pleural effusions and empyema - Breen - 2014 - Respirology - Wiley Online Library", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/10.1111/resp.12339", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "The presence of pleural fluid in the context of pneumonia occurs in approximately 40% of patients;16 however, from prospective studies of hospital admissions with community-acquired pneumonia, 5.5–7.2% have or will have developed complicated parapneumonic effusions or empyema.17, 18 The terms compli", "score": 0.45348024 }, { "number": 10, "title": "Predicting Factors for Outcome of Tube Thoracostomy in Complicated Parapneumonic Effusion or Empyema - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S001236921635646X", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "### Improved survival in management of empyema thoracis\n\n### J Thorac Cardiovasc Surg\n\n### Empyema\n\n### J Thorac Cardiovasc Surg\n\n### Current diagnostic methods and medical management of thoracic empyemas\n\n### Chest Surg Clin North Am\n\n### Aerobic and anaerobic microbiology of empyema: a retrospecti", "score": 0.4424684 }, { "number": 11, "title": "The management of pleural space infections - Chapman - 2004 - Respirology - Wiley Online Library", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/10.1111/j.1440-1843.2003.00535.x", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "This review discusses the clinical aspects of pleural infection, focusing on the presentation and management of complicated parapneumonic effusion, empyema, and tuberculous pleural effusion. In some cases this initial effusion may progress to a ‘complicated parapneumonic effusion’, which is characte", "score": 0.7610953 }, { "number": 12, "title": "Distinguishing complicated from uncomplicated... : Current Opinion in Pulmonary Medicine", "detail": "journals.lww.com", "url": "https://journals.lww.com/co-pulmonarymedicine/fulltext/2015/07000/distinguishing_complicated_from_uncomplicated.8.aspx?Ppt=Article%7Cco-pulmonarymedicine%3A2015%3A07000%3A00008%7C10.1097%2Fmcp.0000000000000164%7C", "authors": "journals.lww.com", "host": "journals.lww.com", "snippet": "Clinical guidelines advocate the evaluation of radiological (large effusion or loculation), bacteriological (Gram-positive stain or culture), biochemical (pH < 7.20 or glucose <60 mg/dl), and macroscopic (pus) characteristics of the pleural fluid to assist in the identification of complicated PPEs. ", "score": 0.7482976 }, { "number": 13, "title": "TSANZ Abstract - 2025 - Internal Medicine Journal - Wiley Online Library", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/10.1111/imj.70003", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "Results: Between May 2022 and January 2024, 43 patients were diagnosed with PI. Median age was 61 years (IQR 49–76), 59% were male, and the median Charlson Comorbidity Index was 3 (IQR 1–5). PI effusions were more right-sided (59%) and most frequently 25%–50% of hemithorax size on presentation. Mean", "score": 0.64746445 }, { "number": 14, "title": "Intrapleural Fibrinolytic Therapy : Chest - Ovid", "detail": "journals.lww.com", "url": "https://journals.lww.com/00002953-202602000-00012", "authors": "journals.lww.com", "host": "journals.lww.com", "snippet": "Complicated parapneumonic effusion (CPE) refers to accumulation of pleural fluid adjacent to pneumonia that cannot be cleared by simple aspiration. If this", "score": 0.61251885 }, { "number": 15, "title": "1268 : Critical Care Medicine", "detail": "journals.lww.com", "url": "https://journals.lww.com/ccmjournal/abstract/2012/12001/1268__treatment_of_complicated_parapneumonic.1226.aspx", "authors": "journals.lww.com", "host": "journals.lww.com", "snippet": "Complicated parapneumonic effusions (PPEs) have a mortality rate of 15%. Patients often require tube thoracostomy followed by video assisted thoracostomy or thoracotomy for definitive management. The administration of intrapleural (IPL) fibrinolytics paired with an enzymatic debridement agent may be", "score": 0.60077465 }, { "number": 16, "title": "Intrapleural therapy in management of complicated parapneumonic effusions and empyema - PubMed", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/pubmed/22291507", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "Title: Intrapleural therapy in management of complicated parapneumonic effusions and empyema - PubMed\nAn official website of the United States government. Federal government websites often end in .gov or .mil. official website and that any information you provide is encrypted. ## Save citation to fi", "score": 0.67885995 }, { "number": 17, "title": "Parapneumonic Pleural Effusions and Empyema Thoracis - StatPearls", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK534297", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "Dykes JKB, Lawton A, Burchett S, Gupta A. Arch Dis Child Educ Pract Ed. 2023 Apr; 108(2):86-90. Epub 2021 Nov 12.\n [Review [From pneumonic infiltration to parapneumonic effusion--from effusion to pleural empyema: internal medicine aspects of parapneumonic effusion development and pleural empyema].](", "score": 0.5050542 }, { "number": 18, "title": "Pleural fluid chemical analysis in parapneumonic effusions: a meta-analysis - Database of Abstracts of Reviews of Effects (DARE): Quality-assessed Reviews - NCBI Bookshelf", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK66368", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "## Implications of the review for practice and research\n\nPractice: The authors stated that current evidence suggests that decisions regarding chest tube placement should derive from pleural fluid pH rather than glucose or LDH results. A pH value of 7.29 should be considered the decision threshold fo", "score": 0.7539928 }, { "number": 19, "title": "Conservative and Surgical Modalities in the Management of Pediatric Parapneumonic Effusion and Empyema", "detail": "journal.chestnet.org", "url": "https://journal.chestnet.org/article/S0012-3692(23)00811-5/abstract", "authors": "journal.chestnet.org", "host": "journal.chestnet.org", "snippet": "Conservative and Surgical Modalities in the Management of Pediatric Parapneumonic Effusion and Empyema - CHEST. Conservative and Surgical Modalities in the Management of Pediatric Parapneumonic Effusion and Empyema. Division of Respiratory Medicine, Department of Pediatrics, British Columbia Childre", "score": 0.5798055 }, { "number": 20, "title": "Lung Decortication - StatPearls - NCBI Bookshelf", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK564375", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "Postoperative Care\n\nPostoperative care includes adequate analgesia, antibiotic therapy, hydration, and nutritional support. Sick patients often require mechanical ventilation, so intensive monitoring must be ensured during the initial postoperative period. Adequate care of the chest tubes must also ", "score": 0.5052006 }, { "number": 21, "title": "[PDF] Fibrinolytic Therapy versus Medical Thoracoscopy for Treatment of ...", "detail": "cdn.clinicaltrials.gov", "url": "https://cdn.clinicaltrials.gov/large-docs/34/NCT03213834/Prot_SAP_003.pdf", "authors": "cdn.clinicaltrials.gov", "host": "cdn.clinicaltrials.gov", "snippet": "Trial (MIST2).9 However, this approach is expensive, with a substantial hospital stay (around 12 days), and had a no significant decrease in the rate of surgery referral as compared to placebo.9 Although two randomized studies have shown that around 80% of patients with pleural infection can be succ", "score": 0.7823471 }, { "number": 22, "title": "Medical thoracoscopy combined with intrapleural injection of urokinase for treatment of pleural infection-a multicenter, prospective, randomized controlled study: study protocol - PMC", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11742517", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov", "snippet": "In 2011, a prospective multicenter randomized controlled study (MIST-2) indicated that administering fibrinolytic agents (tPA combined with DNase) within the pleural cavity can significantly enhance pleural drainage, facilitating the expulsion of pleural effusions and the absorption of lesions . Ano", "score": 0.752468 }, { "number": 23, "title": "Rethinking the Doses of Tissue Plasminogen Activator and Deoxyribonuclease Administrated Concurrently for Intrapleural Therapy for Complicated Pleural Effusion and Empyema", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6368361", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov", "snippet": "The MIST 2 study consisted of 210 patients with pleural infection who were randomized to one of the four treatment arms: tPA and placebo, tPA and DNase, DNase and placebo, and double placebo. The dose of DNase given was 5 mg, and the dose of tPA was 10 mg. Medications were instilled intrapleurally u", "score": 0.68798697 }, { "number": 24, "title": "Intrapleural Tissue Plasminogen Activator and Deoxyribonuclease for Pleural Infection. An Effective and Safe Alternative to Surgery", "detail": "www.atsjournals.org", "url": "https://www.atsjournals.org/doi/10.1513/AnnalsATS.201407-329OC", "authors": "www.atsjournals.org", "host": "www.atsjournals.org", "snippet": "**Rationale:** Intrapleural tissue plasminogen activator (tPA)/deoxyribonuclease (DNase) therapy for pleural infection given at the time of diagnosis has been shown to significantly improve radiological outcomes. **Objectives:** Multinational observation series to evaluate the pragmatic “real-life” ", "score": 0.68697983 } ], "publishedAt": "2026-09-15T18:12:51.168009+00:00", "updatedAt": "2026-09-15T18:12:51.168009+00:00", "readingMinutes": 6, "slug": "parapneumonic-effusion-drainage-criteria" }