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The clinical significance of serum and bronchoalveolar lavage inflammatory cytokines in patients at risk for Acute Respiratory Distress Syndrome

Abstract

Background

The predictive role of many cytokines has not been well defined in Acute Respiratory Distress Syndrome (ARDS).

Methods

We measured prospectively IL-4, IL-6, IL-6 receptor, IL-8, and IL-10, in the serum and bronchoalveolar lavage fluid (BALF) in 59 patients who were admitted to ICU in order to identify predictive factors for the course and outcome of ARDS. The patients were divided into three groups: those fulfilling the criteria for ARDS (n = 20, group A), those at risk for ARDS and developed ARDS within 48 hours (n = 12, group B), and those at risk for ARDS but never developed ARDS (n = 27, group C).

Results

An excellent negative predictive value for ARDS development was found for IL-6 in BALF and serum (100% and 95%, respectively). IL-8 in BALF and IL-8 and IL-10 serum levels were higher in non-survivors in all studied groups, and were associated with a high negative predictive value. A significant correlation was found between IL-8 and APACHE score (r = 0.60, p < 0.0001). Similarly, IL-6 and IL-6r were highly correlated with PaO2/FiO2 (r = -0.27, p < 0.05 and r = -0.55, p < 0.0001, respectively).

Conclusions

BALF and serum levels of the studied cytokines on admission may provide valuable information for ARDS development in patients at risk, and outcome in patients either in ARDS or in at risk for ARDS.

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Background

Acute respiratory distress syndrome (ARDS) is characterized by respiratory failure of acute onset as a result of acute lung injury (ALI) either directly or indirectly via the blood. The main characteristics of the syndrome are diffuse inflammation and increased microvascular permeability that cause diffuses interstitial and alveolar oedema and persistent refractory hypoxemia [1]. Although a variety of insults may lead to ARDS, a common pathway may probably result in the lung damage [2–4]. A complex series of inflammatory events have been recognized during the development of ARDS but the exact sequence of the events remains unclear. Leukocyte activation and free radical release, proteases, arachidonic acid metabolites, inflammatory and anti-inflammatory cytokines results in the increased alveolar-capillary membrane permeability [5–7].

Cytokines are produced in the lung by local resident cells such as alveolar macrophages, lung epithelial cells, and fibroblasts or by cells such as neutrophils, lymphocytes, monocytes and platelets as a response to local or systemic injury [8–12]. Cytokines involved in the early phase of inflammatory response, such as IL-1, IL-2, IL-6, IL-8, [8, 13, 14] are secreted in response to injurious agents.

Inflammatory cytokines are of critical importance in the pathophysiology of septic shock, a condition frequently leading to ARDS [15]. It has been hypothesized that the inability of lung to repair after ALI is due to a persisted inflammatory stimulus [16].

Predictive levels of inflammatory cytokines (IL-1, IL-2, IL-6, IL-8) for ARDS development in at risk patients have been reported with controversial results [5, 7, 11, 15, 16]. Cut-off values above which ARDS development occurs in at risk patients have been also reported for IL-4 and IL-10 [16]. Schutte et al [17] compared ARDS to pneumonia and cardiogenic pulmonary oedema patients and found higher IL-6 and IL-8 values in ARDS compared to remaining populations. A systematic study of the role of all main inflammatory cytokines at the same time in the pathogenesis and development of the ARDS has not been undertaken.

The purpose of this study is to evaluate the role of inflammatory cytokines IL-4, IL-6, IL-6r, IL-8, and IL-10 in serum and bronchoalveolar lavage (BALF) as possible prognostic indicators for the development, severity, and outcome of patients with ARDS or at risk for ARDS.

Methods

Patients

We studied prospectively 59 consecutive patients who were admitted in our Intensive Care Units (ICU) (Table 1). The first group (group A) included 20 patients fulfilling the criteria of ARDS [1]. All these patients were supported mechanically for their respiratory failure. The second group (group B) included 12 patients on mechanical respiratory support who had at least one condition from those suggested by Fowler et al [2] as risk factors for ARDS development. All patients in this group developed ARDS within 48 hours. The third group (group C) included 27 patients on high risk for ARDS development who never developed ARDS (Table 1).

Table 1 Clinical features of the studied population on admission.

For patients' classification, the following criteria were employed: 1. The ARDS criteria of the American-European Consensus Conference on ARDS (1): a. acute onset, b. bilateral chest radiographic infiltrates, c. pulmonary artery occlusion pressure of ≤18 mm Hg, or no evidence of left atrial hypertension, and d. impaired oxygenation regardless of the PEEP concentration, with a PaO2/FiO2 ratio of ≤ 300 torr for ALI and ≤ 200 torr for ARDS. 2. The high-risk criteria for ARDS development according to Fowler et al [2]). 3. The criteria for pneumonia according to EPIC study [18], and 4. The criteria for septic syndrome according to Bone et al [19]. Acute Physiology and Chronic Health Evaluation-II (APACHE II) scoring system was used for grading the disease severity [20]).

The main clinical features of the patients are shown in Table 1. The protocol was approved by the Ethics Committee of our institutions.

After admission to the ICU blood samples were obtained from a central venous line within 2 hours. APACHE II score and PaO2/FiO2 values were obtained at the time of sample collection. The blood was collected in a heparinized vacutainer tube and kept immediately at 4°C. After centrifugation at 1500 g at 4°C, the plasma was kept at -80°C until the measurement. Immediately after blood collection BALF was obtained by fiberoptic bronchoscopy. The fluid was filtered through nylon net to remove the mucous secretions, and centrifuged at 500 g for 10 min to remove cells. The supernatant was kept in cryotubes at -80°C in aliquots of 0.5 ml. The method of micro-lavage was used as described previously [21]. The following criteria were used for an acceptable sample: a. The procedure should be shorter than 1 min, while the time of saline staying into the lungs should be less than 20 sec, b. recovery of more than 50% of the saline used for the lavage, c. absence of obvious blood contamination in the BALF, and d. the level of urea in the BALF should be more than 0.4 mmol. The urea level was used as an index of BALF dilution [21]. To check the accuracy of the method, two subsequent lavages were taken in 8 patients and all the studied parameters in the two samples did not differ significantly.

Measurement of the plasma cytokines

The assay method for cytokine measurement was the same for blood and BALF samples. Determination of plasma cytokines was done with solid phase enzyme-linked immunosorbent assay (ELISA) methodology based on the quantitative immunometric sandwich enzyme immunoassay technique [22]. Reagents for the studied cytokines were obtained from several sources (kits of R&D systems, Inc. Minneapolis, MN, USA, for IL-6R, kits of Genzyme Diagnostics, Cambridge, MA, USA for IL-8, IL-10, and RIA kits of Amersham, Buckinghamshire, UK, for IL-4, IL-6) were used according to manufacturer's instructions. Intra-assay and inter-assay reproducibility was checked and found more than 90%. To calculate the dilution factor of the BALF, urea values in the plasma and BALF were used because this low molecular weight substance is found to be in the body fluids at the same concentration as in the blood.

Statistical analysis

Data analysis was carried out using SPSS 8.0 statistical software (SPSS Inc., Chicago, IL). Results are expressed as mean ± 1SD, or median (range), unless otherwise indicated. The Mann-Whitney non-parametric test was used to compare the mean values of the cytokines in the blood and BALF in the various groups. Receiver-operating characteristic (ROC) correlation was used to find the optimal cut-off values of the studied cytokines for ARDS development in patient at risk and survival of the patient population [23]. For tests of association, we calculated Spearman's correlation coefficient. A p value <0.05 was considered to be statistically significant.

Results

There was no significant difference in the mean age of the patients among the three studied groups. Using APACHE-II score to determine the severity of the disease, significant difference between group A and group C (p = 0.04) and group B and C (p = 0.045) was found, and not between groups A and B (p = 0.06). The mean time of staying in the ICU did not differ among the three groups.

Predictive capabilities of BALF mediators for onset of ARDS

The mean values (+/- SD) of the measured cytokines in BALF and serum in the three studied patient groups are shown in Table 2. A significant difference was found for BALF IL-6r, which was higher in group A than in groups B and C (p < 0.0001). Similarly, BALF IL-6 was higher in groups A and B compared to C (p < 0.01).

Table 2 Mean (+/-SD) BALF and serum levels of studied cytokines in the three groups of patients.

Predictive capabilities of serum mediators for onset of ARDS

Serum levels of IL-4 were higher in group A compared to groups B and C (p < 0.0001). Serum IL-6 was higher in group B compared to group A and C (p < 0.05). Serum levels of IL-8 was higher in group A and group B compared to group C (p < 0.0001) (Table 2). Predictive values for ARDS development in at risk patients (groups B and C) for BALF and serum IL-6 are shown in Table 3. IL-6 negative predictive values for ARDS development were 100% and 95% for BALF cut off value of 195 pg/ml and serum cut off value of 255 pg/ml, respectively.

Table 3 BALF and serum IL-6 predictive values for ARDS development in patients at risk (n = 39, groups B+C).

Predictive capabilities of BALF mediators for survival of ARDS

Mean (SEM) values in BALF and serum of the studied mediators in the survivors and non-survivors (groups A+B+C) are shown in Table 4. BALF levels of IL-6, IL-6r and IL-8 were significantly higher in those who did not survive (p < 0.05, p < 0.05 and p < 0.0001, respectively).

Table 4 Mean (SEM) BALF and serum levels of the measured cytokines in all patients (Groups A+B+C) according to survival.

Patients with ARDS (group A) who did not survive had significantly higher BALF levels of IL-8 (p < 0.0001) and significantly lower BALF levels of IL-10 (p < 0.001) (Table 5). Patients at risk (groups B and C) who did not survive had significantly higher BALF levels of IL-8 (p < 0.0001) (Table 6). IL-6, IL6-r and IL-8 BALF concentration cut off predictive values for surviving patients are shown in Table 7. BALF IL-8 was also elevated in patients of group C who died (p < 0.0001) (Table 8).

Table 5 Mean (SEM) BALF and serum levels of cytokines in ARDS patients according to survival (group A).
Table 6 Mean (SEM) BALF and serum levels of cytokines in at risk patients who developed or not ARDS according to survival (Groups B and C).
Table 7 Predictive BALF and serum levels (pg/ml) for surviving patients of all groups (n = 59)
Table 8 Mean (SEM) BALF and serum levels of cytokines in at risk patients who did not develop ARDS (group C)

Predictive capabilities of serum mediators for survival of ARDS

Cytokine concentration cut off predictive values for surviving patients are shown in Table 7. All studied mediators were found at higher levels in the serum of non-survivors (p < 0.001 to p < 0.0001). In patients at risk (groups B and C) who did not survive all serum mediators were significantly elevated (p < 0.001 to p < 0.0001) (Table 6). Serum levels of all the studied molecules were increased in all patients that did not survive (p < 0.05 to p < 0.0001) (Table 8).

In survivors BALF/serum ratios were significantly higher for IL-4, IL-8, IL-10 (p < 0.0001, p < 0.001 and p < 0.0001, respectively), due to lower serum levels and not to higher BALF levels.

Correlations of the studied cytokines

Furthermore, the serum levels of all studied mediators were significantly correlated to APACHE II score. Serum IL-8 exhibited the strongest correlation with APACHE II score (Figure 1). The level of IL-8 in the BALF were found to be significantly correlated to APACHE II score (r = 0.60, p < 0.0001).

Figure 1
figure 1

Positive strong correlation of serum levels of IL-8 to APACHE II score (Spearman's rank order correlation coefficient).

PaO2/FiO2 ratio was significantly correlated to the BALF levels of IL-6 and IL-6r (r = -0.27, p < 0.05; r = -0.55, p < 0.0001; respectively) (Figure 2) and to serum levels of IL-4 (r = -0.36, p < 0.05).

Figure 2
figure 2

Negative correlation of BALF levels of IL-6, and IL6 receptor to PaO2/FiO2 ratio (Spearman's rank order correlation coefficient).

Discussion

We designed this study in order to explore factors that could have prognostic value for the development, the severity, and the outcome of patients with ARDS and at risk for ARDS.

Prediction of ARDS development

We observed that BALF levels of IL-6r were significantly higher in group A than in groups B and C (p < 0.0001), while no difference was observed in serum levels among the three groups of patients. Interestingly, the BALF and serum levels of cytokine IL-6 were significantly higher in patients at risk who developed ARDS (group B) compared to the other two groups. This observation differs from previous studies [24, 25], probably reflecting the different patient population from our study. However, our results are in agreement with previous reports regarding the luck of its prediction capacity for ARDS onset [25, 26], since both BALF and serum IL-6 levels, showed a low positive predictive value according to the ROC analysis.

Patients of group A and group B had higher serum levels of the inflammatory cytokine IL-8 compared to the patients of group C, but neither serum nor BALF IL-8 levels were predictive for ARDS development. In two studies, Miller et al, [27] found that IL-8 in BAL at the beginning of ARDS was highest in patients who died, and Donnelly et al [28] found that IL-8 was highest in patients at risk for ARDS who later developed ARDS. Unfortunately, subsequent studies have found that IL-8 does not predict outcome either at the outset or during the course of ARDS [5]). Meduri et al [16] found that all cytokines measured remained high during the course of ARDS in patients who died. The importance of considering anti-inflammatory constituents of BALF is shown by Donnelly et al [28] who found that patients with ARDS who died had significantly lower initial concentrations of IL-10 in BAL than patients who lived. Parson et al [29]) studied serial levels of IL-1ra and IL-10 in patients who were identified as being at risk for the development of ARDS. Initial IL-1ra levels were significantly higher (p < 0.0001) in the patients than in normal control subjects. Similarly, IL-10 levels were increased in patients compared with normal control subjects but did not predict the development of ARDS. Like IL-1ra levels, initial IL-10 levels were significantly higher (p = 0.005) in patients who died compared with survivors.

However, in other studies increased levels of IL-4, and IL-10 in serum and/or BALF were found to have beneficial effect in pre-ARDS patients [13, 14]. Thus, the heterogeneity of patients in the various studies may be a reason for the contradictive results reported earlier.

Prediction of outcome

Patients who died had significantly higher levels of IL-6, IL-6r and IL-8 in BALF than those who finally survived, while all mediators studied were significantly higher in the serum of non-survivors. The rationale for analysis of cytokine concentrations in BAL fluid is that inflammatory cytokines, like IL-6 and IL-8 are known to be produced by airway epithelial cells and activated pulmonary macrophages in response to a variety of infectious agents and other triggers of airway inflammation [30]. During ARDS, the alveolar epithelial-endothelial barrier is disrupted, and cytokines produced in the lung are released into the systemic circulation. This is believed to be a potential mechanism for the development of systemic inflammatory response syndrome [31, 32]. The relationship between circulatory and pulmonary cytokines levels and outcome provides support to the hypothesis that poor outcome in ARDS is related to a persistent inflammatory process [30–33]. In addition, in agreement with our findings, bronchoalveolar concentrations of the above cytokines have been reported to be increased in patients with or at risk for ARDS [33]. As demonstrated by Meduri and co-workers, BAL fluid concentrations of IL-8 and IL-6 were significantly higher in nonsurvivors than in survivors [31]. Increased BAL levels most likely indicate intrapulmonary overproduction and not increased permeability [33]. Therefore, determination of these selected inflammatory cytokines in BAL fluid in ARDS could be of prognostic relevance [33, 34]. Regarding serum levels, patients at risk (groups B and C) who died had all molecules significantly increased (Table 6), suggesting that systemic inflammatory over-response in critically ill patients may be destructive leading to multiple organ dysfunction and poor outcome. Serum levels of all the studied molecules were increased taking all patients together (groups A+B+C, Table 4) or separate (Tables 5, 6, and 8) that did not survive, suggesting that cytokinemia might reflect the severity and extension of inflammation but is not the only factor related to ARDS development. Interestingly, only IL-8 and IL-10 both in BALF and serum were higher in ARDS patients who died. These results are consistent with those of Donnelly and coworkers, who found elevated concentrations of IL-10 in BALF of 28 patients with ARDS [35]. However, our results differ from those of Armstrong and Millar, who found significantly lower concentrations of IL-10 in a small number group of patients at risk for ARDS [36]. In addition, low concentrations of IL-10 in BALF from patients with ARDS were found to be associated with increased mortality [35, 37]. In contrast, all cytokines were elevated in those who died taking together all the patients at risk (groups B and C). Regarding the survival prediction, IL-8 and IL-10 showed the higher serum positive predictive value (92 and 96%, respectively), while IL-4 had the higher serum negative predictive value and sensitivity, taking together all patients.

Relation to severity of lung injury

Regarding the relation of the studied molecules and the severity of lung injury, a negative correlation was found between BALF IL-6, and IL-6r and PaO2/FiO2. The same was true for serum IL-4 and PaO2/FiO2. All the studied molecules in the serum were positively correlated with the APACHE II score, as was BALF IL-8. It is probable that this cytokine is closely related to the extension of tissue damage and organ failure.

Conclusions

In conclusion, our data show that the predictive role of most of the studied molecules both in serum and BALF for ARDS development is valuable. In addition, almost all of them are good predictors of outcome in these patients. Further studies with greater number of patients with various subgroups of ARDS as well as stricter grouping criteria should be designed to investigate the complex network of these molecules and their receptors in ARDS and their value as predictive factors in these patients.

References

  1. Bernard GR, Artigas A, Brigham KL, Carlet J, Falke K, Hudson L, Lamy M, Legall JR, Morris A, Spragg R: The American-European Consensus Conference onARDS Definitions, Mechanisms, Relevant Outcomes, and Clinical Trial Coordination. Am J Respir Crit Care Med. 1994, 149: 818-824.

    Article  CAS  PubMed  Google Scholar 

  2. Fowler AA, Hamman RF, Good JT, Benson KN, Baird M, Eberle DJ, Petty TL, Hyers TM: Adult respiratory distress syndrome risk with common predispositions. Ann Intern Med. 1983, 98: 593-597.

    Article  CAS  PubMed  Google Scholar 

  3. Rinaldo JE., Christman JW: Mechanisms and Mediators of the adult respiratory distress syndrome. Clin Chest Med. 1990, 11: 621-629.

    CAS  PubMed  Google Scholar 

  4. Pepe PE, Potkin RT, Reus DH, Hudson LD, Carrico CJ: Clinical predictors of the adult respiratory distress syndrome. Am J Surg. 1982, 144: 124-128. 10.1016/0002-9610(82)90612-2.

    Article  CAS  PubMed  Google Scholar 

  5. Goodman RB, Strieter RM, Martin DP, Steinberg KP, Milberg JA, Maunder RJ, Kunkel SL, Walz A, Hudson LD, Martin TR: Inflammatory cytokines in patients with persistence of the acute respiratory distress syndrome. Am J Respir Crit Care Med. 1996, 154: 602-611.

    Article  CAS  PubMed  Google Scholar 

  6. Bellingan GJ: The pathogenesis of ALI/ARDS. Thorax. 2002, 57: 540-6. 10.1136/thorax.57.6.540.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  7. Tomashefski JF: Pulmonary pathology of acute respiratory distress syndrome. Clin Chest Med. 2000, 21: 435-466.

    Article  PubMed  Google Scholar 

  8. Meduri GU, Kanangat S, Stefan J, Tolley E, Schaberg D: Cytokines IL-1beta, IL-6, and TNF-alpha enhance in vitro growth of bacteria. Am J Respir Crit Care Med. 1999, 160: 961-967.

    Article  CAS  PubMed  Google Scholar 

  9. Park WY, Goodman RB, Steinberg KP, Ruzinski JT, Radella F, Park DR, Pugin J, Skerrett SJ, Hudson LD, Martin TR: Cytokine balance in the lungs of patients with acute respiratory distress syndrome. Am J Respir Crit Care Med. 2001, 164: 1896-1903.

    Article  CAS  PubMed  Google Scholar 

  10. Tamura DY, Moore EE, Partrick DA, Johnson JL, Zallen G, Silliman CC: IL-6 augments neutrophil cytotoxic potential via selective enhancement of elastase release. J Surg Res. 1998, 76: 91-94. 10.1006/jsre.1998.5295.

    Article  PubMed  Google Scholar 

  11. Kiehl MG, Ostermann H, Thomas M, Muller C, Cassens U, Kienast J: Inflammatory mediators in bronchoalveolar lavage fluid and plasma in leukocytopenic patients with septic shock-induced acute respiratory distress syndrome. Crit Care Med. 1998, 26: 1194-1199. 10.1097/00003246-199807000-00019.

    Article  CAS  PubMed  Google Scholar 

  12. Martin TR: Lung cytokines and ARDS: Roger S. Mitchell Lecture. Chest. 1999, 116: 2S-8S. 10.1378/chest.116.suppl_1.2S.

    Article  CAS  PubMed  Google Scholar 

  13. Mulligan SM, Jones ML, Vaporciyan AA, Maureen CH, Ward PA: Protective effects of IL-4 and IL-10 against immune complex-induced lung injury. J Immunol. 1993, 151: 5666-5674.

    CAS  PubMed  Google Scholar 

  14. Van Laetherm JL, Eskinazi R, Louis H, Rickaert F, Robberecht P, Devieve J: Multisystem production of interleukin 10 limits the severity of acute pancreatitis in mice. Gut. 1998, 43: 408-413.

    Article  Google Scholar 

  15. Headley AS, Tolley E, Meduri GU: Infections and the inflammatory response in acute respiratory distress syndrome. Chest. 1997, 111: 1306-21.

    Article  CAS  PubMed  Google Scholar 

  16. Meduri GU, Kohler G, Headley S, Tolley E, Stentz F, Postlethwaite A: Inflammatory cytokines in the BAL of patients with ARDS. Persistent elevation over time predicts poor outcome. Chest. 1995, 108: 1303-14.

    Article  CAS  PubMed  Google Scholar 

  17. Schutte H, Lohmeyer J, Rosseau S, Ziegler S, Siebert C, Kielisch H, Pralle H, Grimminger F, Morr H, Seeger W: Bronchoalveolar and systemic cytokine profiles in patients with ARDS, severe pneumonia and cardiogenic pulmonary oedema. Eur Respir J. 1996, 9: 1858-67. 10.1183/09031936.96.09091858.

    Article  CAS  PubMed  Google Scholar 

  18. Vincent JL, Bihari DJ, Suter PM, Bruining HA, White J, Nicolas-Chanoin MH, Wolff M, Spencer RC, Hemmer M: Prevalence of nosocomial infection in intensive care units in Europe. Results of the European Prevalence of Infection in Intensive Care (EPIC) study. EPIC International Advisory Committee. JAMA. 1995, 274: 639-644. 10.1001/jama.274.8.639.

    Article  CAS  PubMed  Google Scholar 

  19. Bone RC, Balk RA, Cerra FB, Dellinger RP, Fein AM, Knaus WA, Schein RM, Sibbald WJ: The ACCP/SCCM Consensus Conference Committee: American College of Chest Physicians/Society of Critical Care Medicine Consensus Conference:Definitions for sepsis and organ failure and guidelines for the use of innovative therapies in sepsis. Chest. 1992, 101: 1644-1655.

    Article  CAS  PubMed  Google Scholar 

  20. Knaus WA, Draper EA, Wagner DP, Zimmerman JE: APACHE II: a severity of disease classification system. Crit Care Med. 1985, 13: 818-29.

    Article  CAS  PubMed  Google Scholar 

  21. Baldwin DR, Wise R, Andrews JM, Honeybourne D: Microlavage: a technique for determining the volume of epithelial lining fluid. Thorax. 1991, 46: 658-662.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  22. Grassi J, Frobert Y, Pradelles P, Chercuitte F, Gruaz D, Dayer JM, Poubelle PE: Production of monoclonal antibodies against IL-1a and IL-1b: development of the two-enzyme immunometric assays (EIA) using acetylcholinesterase and their application to biological media. J Immunol Meth. 1989, 123: 193-210. 10.1016/0022-1759(89)90223-8.

    Article  CAS  Google Scholar 

  23. Zweig MH, Campbell G: Receiver-operating characteristic (ROC) plots: a fundamental evaluation tool in clinical medicine. Clin Chem. 1993, 39: 561-77.

    CAS  PubMed  Google Scholar 

  24. Mitchell RS: Lung cytokines and ARDS. Chest. 1999, 116: 2S-8S. 10.1378/chest.116.suppl_1.2S.

    Article  Google Scholar 

  25. Meduri GU, Headley S, Kohler G, Stentz F, Tolley E, Umberger R, Leeper K: Persistent elevation of inflammatory cytokines predicts a poor outcome in ARDS. Plasma IL-1 beta and IL-6 levels are consistent and efficient predictors of outcome over time. Chest. 1995, 107: 1062-1073.

    Article  CAS  PubMed  Google Scholar 

  26. Calandra T, Gerain J, Heumann D, Baumgartner JD, Glauser MP: High circulating levels of interleukin-6 in patients with septic shock: evolution during sepsis, prognostic value, and interplay with other cytokines. The Swiss-Dutch J5 Immunoglobulin Study Group. Am J Med. 1991, 91: 23-29. 10.1016/0002-9343(91)90069-A.

    Article  CAS  PubMed  Google Scholar 

  27. Miller EJ, Cohen AB, Nagao S, Griffith D, Maunder RJ, Martin TR, Weiner-Kronish JP, Sticherling M, Christophers E, Matthay MA: Elevated levels of NAP-1/interleukin-8 are present in the airspaces of patients with the adult respiratory distress syndrome and are associated with increased mortality. Am Rev Respir Dis. 1992, 146: 427-432.

    Article  CAS  PubMed  Google Scholar 

  28. Donnelly SC, Strieter RM, Reid PT, Kunkel SL, Burdick MD, Armstrong I, Mackenzie A, Haslett C: The association between mortality rates and decreased concentrations of interleukin-10 and interleukin-1 receptor antagonist in the lung fluids of patients with the adult respiratory distress syndrome. Ann Intern Med. 1996, 125: 191-196.

    Article  CAS  PubMed  Google Scholar 

  29. Parsons PE, Moss M, Vannice JL, Moore EE, Moore FA, Repine JE: Circulating IL-1ra and IL-10 levels are increased but do not predict the development of acute respiratory distress syndrome in at risk patients. Am J Respir Crit Care Med. 1997, 155: 1469-1473.

    Article  CAS  PubMed  Google Scholar 

  30. Shelhamer JH, Levine SJ, Wu T, Jacoby DB, Kaliner MA, Rennard SI: Airway inflammation. Ann Intern Med. 1995, 123: 288-304.

    Article  CAS  PubMed  Google Scholar 

  31. Agouridakis P, Kyriakou D, Alexandrakis MG, Prekates A, Perisinakis K, Karkavitsas N, Bouros D: The predictive role of serum and bronchoalveolar lavage cytokines and adhesion molecules for acute respiratory distress syndrome development and outcome. Respir Res. 2002, 23 (3(1)): 25-10.1186/rr193.

    Article  Google Scholar 

  32. Agouridakis P, Kyriakou D, Alexandrakis MG, Persinakis K, Karkavitsas N, Bouros D: Association between increased levels of IL-2 and IL-15 and outcome in patients with early acute respiratory distress syndrome. Eur J Clin Invest. 2002, 32: 862-867. 10.1046/j.1365-2362.2002.01081.x.

    Article  CAS  PubMed  Google Scholar 

  33. Meduri GU, Kohler G, Headley S, Tolley E, Stentz F, Postlethwaite A: Inflammatory cytokines in the BAL of patients with ARDS. Chest. 1995, 108: 1303-1314.

    Article  CAS  PubMed  Google Scholar 

  34. Kiehl MG, Ostermann H, Thomas M, Muller T, Cassens U, Kienast J: Inflammatory mediators in bronchoalveolar lavage fluid and plasma in leukocytopenic patients with septic shock-induced acite respiratory distress syndrome. Crit Care Med. 1998, 26: 1194-1198. 10.1097/00003246-199807000-00019.

    Article  CAS  PubMed  Google Scholar 

  35. Donnelly SC, Strieter RM, Reid PT, Kunkel SL, Burdick MD, Armstrong I, Mackenzie A, Haslett C: The association between mortality rates and decreased concentrations of IL-10 and interleukin-1 receptor antagonist in the lung fluids of patients with the adult respiratory distress syndrome. Ann Intern Med. 1996, 125: 191-196.

    Article  CAS  PubMed  Google Scholar 

  36. Armstrong L, Millar AB: Relative production of tumour necrosis factor alpha and interleukin in adult respiratory distress syndrome. Thorax. 1997, 52: 442-446.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  37. Park WY, Goodman RB, Steinberg KP, Ruzinski JT, Radella F, Park DR, Pugin J, Skerrett SJ, Hudson LD, Martin TR: Cytokine balance in the lungs of patients with acute respiratory distress syndrome. Am J Respir Crit Care Med. 2001, 164: 1896-1903.

    Article  CAS  PubMed  Google Scholar 

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Acknowledgments

We thank Konstantinos Perisynakis for assisting in statistical analysis.

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Correspondence to Demosthenes Bouros.

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Authors' contributions

DB conceived of the study, and participated in its design and coordination and drafted the manuscript

MGA participated in the design of the study, carried out immunoassays and drafted the manuscript

KMA carried out immunoassays and drafted the manuscript

PA patients data and samples collection

IP patients data and samples collection

SA patients data and samples collection

GP Performed statistical analysis

AP patients data and samples collection

NK carried out RIA measurements

DP KMA carried out immunoassays and drafted the manuscript

All authors read and approved the final manuscript

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Bouros, D., Alexandrakis, M.G., Antoniou, K.M. et al. The clinical significance of serum and bronchoalveolar lavage inflammatory cytokines in patients at risk for Acute Respiratory Distress Syndrome. BMC Pulm Med 4, 6 (2004). https://doi.org/10.1186/1471-2466-4-6

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