1	Part 2A: Bronchioloalveolar lavage, volume 1 Bronchoscopy International
2	History BAL Originally described in the 1970s Originally referred to as a “Liquid lung biopsy” A BAL samples the contents of millions of alveoli Yield is therefore greatest for alveolar filling processes
3	BAL today Performed routinely in patients with pulmonary infiltrates of presumed infectious etiology. Performed also in patients with history or suspicion of neoplasm. Performed for other alveolar filling processes Alveolar proteinosis Alveolar hemorrhage Fat embolism and lipoid pneumonia
4	Training is essential in order to Learn proper techniques and indications Avoid procedure-related complications. Learn to protect the equipment and the patient To maximize fluid return To avoid scope-related trauma To avoid excess patient discomfort (cough, anxiety, shortness of breath).
5	Greatest yield for BAL in patients with Peripheral Malignancy Infection (Pneumocystis in HIV 96-98%) Alveolar proteinosis, alveolar hemorrhage Fat embolism and Lipoid pneumonia Silicosis/berylliosis/asbestos Eosinophilic lung disease
6	Indications for BAL Research applications Characteristic cellular patterns in numerous diseases (asthma, ARDS) Several ILD have distinct findings on BAL Well-defined cellular patterns for smokers, former smokers, and nonsmokers
7	Contraindications to BAL No contraindications, but BAL-induced hypoxemia may last several hours And may exacerbate respiratory insufficiency Caution also in ventilated patients (minimize time in the airway) In unstable patients with severe hypoxemia, large volume BAL may be enough to prompt need for intubation.
8	BAL Techniques vary Location should be recorded in procedure note Increased yield in gravity dependent areas Target involved segment in focal disease RML and lingula are also preferred sites Wedge the scope in the target segment Suction channel should be in the airway lumen, not against the wall Confirmed by slight airway wall collapse with gentle suction Fluid instillation gently dilates segmental airway
9	Bronchoalveolar lavage Bronchioloalveolar lavage
10	BAL technique Saline instillation (room temperature) Small aliquots (20-60 each) via syringe More than 100 cc total per segment sampled Usually done after biopsy or brushing to increase cellular content of BAL sample for diagnosis of infection or malignancy In ILD, changes in cell population of recovered fluid occurred only after at least 120 cc is instilled.
11	Example of gravity bag technique for BAL
12	BAL Techniques Fluid recovery via suction channel Hand suction into syringe, Gravity flow into a dependent container, or Gentle wall suction into a specimen container Optimal dwell time unknown Some use slow deep inspiration with instillation and slow exhalation with recovery Recovery better with larger instilled volumes First aliquot often recover < 20% of volume Subsequent aliquots recover 40-70% of volume Aliquots are usually pooled together often excluding the first aliquot (may contain mostly bronchial cells)
13	Q9: Bronchoalveolar Lavage Fluid return is usually greatest in smokers
14	FALSE. In smokers, BAL fluid return is less than in nonsmokers (in whom one might expect to retrieve about 40-60 percent of the fluid instilled). Techniques that help maximize fluid return include Instructing the patient to breathe deeply during fluid instillation and during suctioning Wedging the bronchoscope deep inside the segmental bronchus Using suction pressures less than 120 cm H₂O (using manual suction rather than wall suction for example)
15	BAL fluid return is also enhanced by Targeting the middle lobe or the lingula in case of diffuse disease Preferential selection of nondependent abnormal areas in case of localized disease
16	Diagnostic yield for BAL Characteristic cellular patterns in numerous diseases Several ILD have distinct findings on BAL Well-defined cellular patterns for smokers, former smokers, and nonsmokers More specific yields in: Malignancy Infection (Pneumocystis in HIV 96-98%) Hemorrhage Alveolar proteinosis Fat embolism Lipoid pneumonia Silicosis/berylliosis/asbestos Eosinophilic lung disease Others
17	Q9: Bronchoscopy with BAL is superior to sputum induction to rule out Tuberculosis
18	FALSE. Induced sputum is equivalent to bronchoscopy with BAL for routine evaluation of suspected TB. Anderson et al Patients unable to expectorate or sputum negative. 3% saline followed by bronchoscopy. 26 had TB, 20 cases positive on sputum, 19 cases positive on bronchoscopy. Sensitivity: 73% bronchoscopy, 77% sputum. Conde et al 143 patients with confirmed TB. Diagnosis based on Single sputum induction in 66%, BAL 72%. This was Regardless of HIV status. Saglam et al HIV negative patients with suspected TB. Initially smear negative. Sputum induction smear positive 47%, culture positive 63%. Bronchoscopy smear positive in 53% and culture positive in 67%. McWilliams et al Prospective study. Patients initially smear negative, 3 sputum inductions, if negative then bronchoscopy with BAL. 42 cases of TB. 27 TB patients went through all phases. 96% were positive on induced sputum. 52% positive on bronchoscopy with BAL. Only 1 positive using bronchoscopy alone. 13 positive with sputum induction alone and 13 were positive using both modalities.
19	Induced sputum versus BAL for detection of Acid Fast Bacilli Smear
20	Induced Sputum vs BAL *Induced sputum vs BAL sensitivity 34% vs 38% specificity 100% vs 100% positive predictive value 100% vs 100% negative predictive value 53% vs 55% These patients were able to participate in sputum induction. Multiple (up to 3) induced sputum samples should be obtained
21	Induced Sputum vs BAL Bronchoscopy should only be done after induced sputum x 3 are negative, or in patients unable to provide inducible sputum: Risks to pt/staff limited availability of bronchoscopy in developing countries
22	BAL in Lung Cancer BAL: performed in setting of peripheral, endoscopically nonvisible lesions Cytology positive in about 25% with peripheral lesions Increases to 70% in patients with endoscopically visible lesions Higher yield with infiltrates as opposed to nodules Bronchoalveolar cell carcinoma: most readily identified primary lung cancer Positive cytology approaching 90% Can also detect metastatic malignancy Melanoma, soft tissue sarcoma, and malignancies of breast, GI, and pancreas.
23	BAL in immuno-suppressed patients
24	BAL – related complications and adverse events Hypoxemia Fever in 25-50 % Usually resolves in a few hours and after administration of antipyretics. Increased density on chest radiograph or CT Crackles and alveolar infiltrates may last up to 24 hours Decrease in spirometry Pneumothorax Increased mean airway pressures (in ventilated patients)
25	Other complications of BAL BAL specific bleeding 0.7%¹ Complication rates similar to those of inspection flexible bronchoscopy Mortality 0.01 -0.04% Major complications < 1% Fever, bleeding, infection, arrhythmia, respiratory depression, vagal reactions, pneumothorax, bronchospasm, bacteremia Decrease in pa02 is common and worse when larger BAL volumes are used. Small series of critically ill pneumonia patients experienced high fever with decreased MAP and pa02^*
26	Safety of BAL Can usually be done safely in patients with asthma Numerous older studies showing safety in AIDS, ARDS, mechanical ventilation, thrombocytopenia.
27	Helpful Hints for performing BAL Avoid rapid “trumpet playing” Instead, suction gently and slowly Keep scope in the midline Avoid cough Decreased recovery in COPD (correlates with worsening FEV1/FVC) Advanced age, smokers versus nonsmokers Mechanical ventilation When scope is over-wedged Acknowledge an inadequate sample Less than 10% of instilled volume Greater than 2% columnar epithelial cells
28	More helpful hints for performing BAL Ask the patient to inhale, and even to hold one’s breath during fluid instillation. Use conscious sedation to improve patient comfort. Carefully examine airway-computed tomography correlations to plan the procedure. Inform bronchoscopy assistants of procedure plan. Use instructions such as “traps on”, “traps off” , to communicate about when to retrieve BAL specimen and communicate with assistants. Inform cytologist and microbiologists of indications for the procedure.
29	This presentation is part of a comprehensive curriculum for Flexible Bronchoscopy. Our goals are to help health care workers become better at what they do, and to decrease the burden of procedure-related training on patients.
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31	All efforts are made by Bronchoscopy International to maintain currency of online information. All published multimedia slide shows, streaming videos, and essays can be cited for reference as: Bronchoscopy International: Art of Bronchoscopy, an Electronic On-Line Multimedia Slide Presentation. http://www.Bronchoscopy.org/Art of Bronchoscopy/htm. Published 2007 (Please add “Date Accessed”).
32	Prepared with the expert assistance of Udaya Prakash M.D. (Mayo Clinic, USA), and Atul Mehta M.D. (Cleveland Clinic, USA), and Wes Shepherd M.D. (Virginia Commonwealth University, USA)