Increased mortality in elderly patients with acute respiratory distress syndrome is not explained by host response

Laura R A Schouten, Lieuwe D J Bos, A Serpa Neto, Lonneke A van Vught, Maryse A Wiewel, Arie J Hoogendijk, Marc J M Bonten, Olaf L Cremer, Janneke Horn, Tom van der Poll, Marcus J Schultz, Roelie M Wösten-van Asperen, MARS consortium, F M de Beer, L D Bos, G J Glas, J Horn, A J Hoogendijk, R T van Hooijdonk, M A Huson, T van der Poll, B P Scicluna, L R A Schouten, M J Schultz, M Straat, L A van Vught, L Wieske, M A Wiewel, E Witteveen, M J M Bonten, O L Cremer, J F Frencken, K van de Groep, P M Klein Klouwenberg, M E Koster-Brouwer, D S Ong, D M Verboom, Laura R A Schouten, Lieuwe D J Bos, A Serpa Neto, Lonneke A van Vught, Maryse A Wiewel, Arie J Hoogendijk, Marc J M Bonten, Olaf L Cremer, Janneke Horn, Tom van der Poll, Marcus J Schultz, Roelie M Wösten-van Asperen, MARS consortium, F M de Beer, L D Bos, G J Glas, J Horn, A J Hoogendijk, R T van Hooijdonk, M A Huson, T van der Poll, B P Scicluna, L R A Schouten, M J Schultz, M Straat, L A van Vught, L Wieske, M A Wiewel, E Witteveen, M J M Bonten, O L Cremer, J F Frencken, K van de Groep, P M Klein Klouwenberg, M E Koster-Brouwer, D S Ong, D M Verboom

Abstract

Background: Advanced age is associated with increased mortality in acute respiratory distress syndrome (ARDS) patients. Preclinical studies suggest that the host response to an injurious challenge is age-dependent. In ARDS patients, we investigated whether the association between age and mortality is mediated through age-related differences in the host response.

Methods: This was a prospective longitudinal observational cohort study, performed in the ICUs of two university-affiliated hospitals. The systemic host response was characterized in three predefined age-groups, based on the age-tertiles of the studied population: young (18 to 54 years, N = 209), middle-aged (55 to 67 years, N = 213), and elderly (67 years and older, N = 196). Biomarkers of inflammation, endothelial activation, and coagulation were determined in plasma obtained at the onset of ARDS. The primary outcome was 90-day mortality. A mediation analysis was performed to examine whether age-related differences in biomarker levels serve as potential causal pathways mediating the association between age and mortality.

Results: Ninety-day mortality rates were 30% (63/209) in young, 37% (78/213) in middle-aged, and 43% (84/196) in elderly patients. Middle-aged and elderly patients had a higher risk of death compared to young patients (adjusted odds ratio, 1.5 [95% confidence interval 1.0 to 2.3] and 2.1 [1.4 to 3.4], respectively). Relative to young patients, the elderly had significantly lower systemic levels of biomarkers of inflammation and endothelial activation. Tissue plasminogen activator, a marker of coagulation, was the only biomarker that showed partial mediation (proportion of mediation, 10 [1 to 28] %).

Conclusion: Little evidence was found that the association between age and mortality in ARDS patients is mediated through age-dependent differences in host response pathways. Only tissue plasminogen activator was identified as a possible mediator of interest.

Trial registration: This trial was registered at ClinicalTrials.gov (identifier NCT01905033 , date of registration July 23, 2013).

Keywords: Aging; Biomarker; Critical care, intensive care, ARDS, host response; Mediation; Outcome.

Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Pathway analysis: stepwise mediation analysis assessing whether the association between age and mortality is mediated by age-dependent differences in biomarker levels. *Adjusted for ethnic background, gender, admission type, readmission, direct hit for ARDS, Charlson Comorbidity Index, APACHE-IV score adjusted for age, immunodeficiency, tidal volume per predicted body weight, positive end-expiratory pressure. C = average direct effect (ADE); A*B = average causal mediation effect (ACME). A’, B’, and C’—adjusted for confounders
Fig. 2
Fig. 2
Patient flow chart
Fig. 3
Fig. 3
Systemic levels of biomarker in ARDS patients stratified by age group. Systemic levels of a interleukin (IL)-6, b IL-8, c IL-10, d Fractalkine, e intracellular adhesion molecule (ICAM)-1, f angiopoetin 2:angiopoetin 1 (ANG2:ANG1), g platelet factor (PF) 4, h tissue plasminogen activator (tPA), i protein C, at onset of ARDS. Young adults, middle-aged adults, and elderly. Box and whisker diagrams depict the median and lower quartile, upper quartile, and their respective 1.5 IQR as whiskers—as specified by Tukey. Group differences between young adults and middle-aged adults, and young adults and elderly were tested by a Mann-Whitney U test. A p value < 0.05 was considered as statistical significant
Fig. 4
Fig. 4
Mediation analysis. a, b Tissue plasminogen activator is a mediator which partially explains the association between age and mortality. *Adjusted for ethnic background, gender, admission type, readmission, direct hit for ARDS, Charlson Comorbidity Index, APACHE-IV score adjusted for age, immunodeficiency, tidal volume per predicted body weight, and positive end-expiratory pressure. ADE, average direct effect; ACME, average causal mediation effect. A p value < 0.05 was considered as statistical significant

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