New Therapies for ARDS
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Abstract
The therapy for the acute respiratory distress syndrome (ARDS) is complex. It consists of supportive therapy for the acute respiratory failure, but this occurs in a context of treatment of the underlying condition(s) in critically ill or injured patients, often with comorbid conditions and with significant interactions between therapies. Therapy can be divided into that which is supportive, ie, which supports the physiologic abnormalities and returns them toward normal but which has no fundamental effect on the underlying mechanisms of the organ injury, and that which is definitive, ie, which affects the mechanisms of injury. Many new therapies have been proposed in the last several years in both the supportive and definitive aspects of treatment. Virtually none of these has been shown to unequivocally improve mortality in a randomized controlled clinical trial. Despite this, changes in therapy have occurred and the high mortality rates associated with ARDS appear to be decreasing. We recently reported a significant lowering of mortality for patients with ARDS in our institution from greater than 60% to approximately 40% over a 10-year period, using the same definition of ARDS and controlling for important variables known to affect outcome. 1 Milberg JA Davis DR Steinberg KP et al. Improved survival of patients with acute respiratory distress syndrome (ARDS): 1983-93.. JAMA. 1995; 273: 306-309 Crossref PubMed Google Scholar This appears to be true in other institutions as well, as suggested by fatality rates of control groups in controlled trials that are lower than those of historic controls. 2 Morris AH Wallace CJ Meniove RL et al. Randomized clinical trial of pressure-controlled inverse ratio ventilation and extracorporeal CO2 removal for adult respiratory distress syndrome.. Am J Respir Crit Care Med. 1994; 149: 295-305 Crossref PubMed Google Scholar , 3 Suchyta MR Clemmer TP Orme JF et al. Increased survival of ARDS patients with severe hypoxemia (ECMO criteria).. Chest. 1991; 99: 951-955 Abstract Full Text Full Text PDF PubMed Google Scholar
