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Haemosiderin-Laden Macrophages in the Bronchoalveolar Lavage Fluid of Patients with Diffuse Alveolar Damage

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Haemosiderin-Laden Macrophages in the Bronchoalveolar Lavage Fluid of Patients with Diffuse Alveolar Damage Eur Respir J 2009; 33: 1361–1366 DOI: 10.1183/09031936.00119108 CopyrightßERS Journals Ltd 2009 Haemosiderin-laden macrophages in the bronchoalveolar lavage fluid of patients with diffuse alveolar damage F. Maldonado*, J.G. Parambil*, E.S. Yi#, P.A. Decker" and J.H. Ryu* ABSTRACT: Quantification of haemosiderin-laden macrophages in bronchoalveolar lavage fluid AFFILIATIONS (BALF) has been used to diagnose diffuse alveolar haemorrhage (DAH) but has not been *Divisions of Pulmonary and Critical Care Medicine and, assessed in patients with diffuse alveolar damage (DAD). "Biostatistics. The present study analysed BALF obtained from 21 patients with DAD diagnosed by surgical #Dept of Laboratory Medicine and lung biopsy. Pathology The median age of 21 patients with DAD was 68 yrs (range 18–79 yrs); 14 (67%) were male and Mayo Clinic, Rochester, MN, USA. 12 (57%) were immunocompromised. The median proportion of haemosiderin-laden macro- CORRESPONDENCE phages in BALF was 5% (range 0–90%), but was o20% in seven (33%) patients, fulfilling the J.H. Ryu commonly used BALF criterion for DAH. There was a trend toward a positive correlation between Division of Pulmonary and Critical the percentage of haemosiderin-laden macrophages in BALF and parenchymal haemorrhage Care Medicine, Gonda 18 South Mayo Clinic assessed semiquantitatively by histopathological analysis. Patients with o20% haemosiderin- 200 1st St SW laden macrophages in BALF showed a significantly increased mortality rate (p50.047) compared Rochester to those with ,20%. MN 55905 In patients with an acute onset of diffuse lung infiltrates and respiratory distress, o20% USA Fax: 1 5072664372 haemosiderin-laden macrophages in BALF can occur with DAD, and is not necessarily diagnostic E-mail: [email protected] of DAH. The finding of o20% haemosiderin-laden macrophages in BALF is associated with a worse prognosis in patients with DAD. Received: August 03 2008 Accepted after revision: KEYWORDS: Acute lung injury, alveolar macrophages, bronchoalveolar lavage, haemosiderin December 02 2008 iffuse alveolar haemorrhage (DAH) is a This percentage of haemosiderin-laden macro- STATEMENT OF INTEREST potentially life-threatening syndrome phages correlates well with the traditional Golde None declared. D defined by diffuse alveolar bleeding score [8, 9], a semiquantitative method of asses- resulting from injury to the pulmonary micro- sing the haemosiderin content of alveolar macro- circulation, such as an immune-mediated capil- phages, and has been used as the diagnostic laritis [1–7]. DAH can be associated with various criterion of DAH in recent studies [12–14]. underlying disorders, including connective tissue Diffuse alveolar damage (DAD) is a histopatholo- disorders, systemic vasculitides, drugs, infec- gical pattern of lung injury, and is the pathological tions, and bone marrow or solid organ trans- correlate in most patients with acute respiratory plantation [1–7]. Patients with DAH usually distress syndrome (ARDS) [15–18]. Early DAD present with dyspnoea and diffuse lung infil- manifests an acute exudative phase that is trates, but overt indication of bleeding, i.e. characterised by interstitial oedema, epithelial haemoptysis, is not always present [4, 6]. necrosis and sloughing, the presence of fibrinous Since DAH is clinically occult in some patients, exudates in alveolar air spaces and hyaline bronchoalveolar lavage (BAL) has been used in membrane formation. In the later organising phase, resorption of hyaline membranes and diagnosing this condition, particularly in patients intra-alveolar exudates occurs, accompanied by at excessive risk in surgical lung biopsy, e.g. proliferation of type II pneumocytes along the thrombocytopenic or unstable patients. Several alveolar walls and proliferation of fibroblasts in criteria based on BAL data have been proposed the interstitium, as well as in the airspaces [18, 19]. for diagnosing alveolar haemorrhage [8–12]. Perhaps the most commonly employed BAL In the present study, the issue of whether European Respiratory Journal criterion is the presence of o20% haemosiderin- increased numbers of haemosiderin-laden Print ISSN 0903-1936 c laden macrophages in BAL fluid (BALF) [12]. macrophages can be found in the BALF of Online ISSN 1399-3003 EUROPEAN RESPIRATORY JOURNAL VOLUME 33 NUMBER 6 1361 DIFFUSE ALVEOLAR DAMAGE F. MALDONADO ET AL. patients with DAD was examined, and this finding correlated Statistical analysis with clinicopathological features. Data are summarised using median, range or mean¡SD for continuous variables, and number or percentage for categorical MATERIAL AND METHODS variables. Comparisons were performed using Fisher’s exact Study subjects test for categorical variables, and the two-sample rank-sum test Using a computer-assisted search, 58 patients were found who for continuous variables. Correlation between continuous had had DAD identified on surgical lung biopsy and been seen variables was assessed using Pearson’s correlation coefficient. at the Mayo Clinic (Rochester, MN, USA) over a 7-yr period, In all cases, two-tailed p-values of f0.05 were considered January 1, 1996 to December 31, 2002. This cohort of 58 patients significant. had been described in a previous publication [20]. Of these patients, 21 (36%) had undergone BAL pre-operatively and the RESULTS BALF had been analysed for haemosiderin-laden macro- phages. This subset of patients formed the present study Demographic and clinical features group. The Mayo Foundation Institutional Review Board The median age of the 21 patients was 66 yrs (range 18–79 yrs); approved the study. 14 (67%) were male (table 1). Of these, 11 (52%) had a smoking history and 12 (57%) were immunocompromised. The causes Lung biopsy of the immunocompromised state were haematopoietic stem Surgical lung biopsy specimens were obtained by limited cell (n54) or solid organ transplantation (n51), chemotherapy thoracotomy in 13 (62%) cases and video-assisted thoraco- for malignancy (n52) and immunosuppressive therapy for scopic surgery in eight (38%). All biopsy slides were reviewed connective tissue disorders (n54), or chronic hypersensitivity by one of the present authors (E.S. Yi), an experienced pneumonitis (n51). pulmonary pathologist, to confirm the diagnosis of DAD and All of the patients presented acutely with dyspnoea, and were quantify the amount of parenchymal haemorrhage and admitted to the hospital. Other symptoms at presentation haemosiderosis, without knowledge of correlative clinical or included cough (57%), fever (29%) and haemoptysis (14%). radiological information. Parenchymal haemorrhage was Inspiratory crackles were heard in 19 (90%) patients; clubbing histologically graded 0–3 (0: absence of intra-alveolar red blood cells; 1: questionable DAH, presence of red blood cells, was absent. At the time of surgical lung biopsy, 16 (76%) but little or no fibrin; 2: intra-alveolar red blood cells and fibrin patients were on invasive mechanical ventilation with lung present; 3: intra-alveolar red blood cells and fibrin present in protective strategies; the remaining five (24%) were on large amounts). Haemosiderosis was assessed and graded 0–3 noninvasive positive-pressure ventilation. in a similar fashion (0: no haemosiderin present; 1: question- All of the patients had peripheral blood analysed for complete able haemosiderosis without definite haemosiderin present; blood cell counts and coagulation parameters at initial 2: haemosiderin present; 3: haemosiderin present in large presentation and serially during the course of their hospitalisa- amounts). tion. The mean¡SD haemoglobin concentration on initial evaluation was 10.6¡1.6 g?dL-1, leukocyte count 11.16103¡ Bronchoscopy 3 -1 3 7.3610 cells?mL and platelet count 177610 ¡966 Fibreoptic bronchoscopy was performed as previously 103 cells?mL-1. described [21]. Sequential infusions of 20-mL aliquots of 0.9% sodium chloride solution at 37uC were promptly aspirated On the day of surgical lung biopsy, the mean arterial oxygen with suction set at 80 mmHg, and collected until a total tension/inspiratory oxygen fraction ratio was 143.2¡64.7. volume of 40 mL BAL effluent was obtained. A sample of fluid Mean arterial carbon dioxide tension was 38.2¡9.2 mmHg was used for bacteriological, virological and fungal studies. and mean arterial pH 7.43¡0.07. The remaining fluid was used for cell counts and cytological examination. Transbronchoscopic lung biopsy was performed in four (19%) patients. TABLE 1 Epidemiological aspects of 21 subjects with Detection of haemosiderin-laden macrophages in diffuse alveolar damage bronchoalveolar lavage fluid Examination of BALF for haemosiderin-laden macrophages Age yrs ¡ ¡ was performed as follows. After centrifugation (Cytospin; Mean SD 60.9 14.9 Shandon Southern Instruments, Runcorn, UK) for 10 min at Median 66 226g, a cell pellet was obtained. Perls’ Prussian blue stain was Range 18–79 used to detect haemosiderin-laden macrophages. For this Sex n (%) purpose, air-dried slides were incubated for 10 min in a stain Female 7 (33) containing hydrochloric acid and potassium ferricyanide, and Male 14 (67) then counterstained with eosin and Mayer’s haemalum. At a Smoking history n (%) magnification of 5006, o200 alveolar macrophages were Current 10 (48) examined for the number of cells that stained with Perls’ Previous 1 (5) Prussian blue stain, and a percentage score was established by Never 10 (48) dividing the number of Prussian-blue-positive cells by the total Immunocompromised hosts n (%) 12 (57) number of cells
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