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Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)
Published on: April 7, 2021
Acute lung injury and acute respiratory distress syndrome
Anil Vasudevan1, Rakesh Lodha, S K Kabra
1Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India.
Insights
Acute lung injury and acute respiratory distress syndrome (ALI/ARDS) affect children in pediatric intensive care units, presenting significant challenges. Advances in supportive care have reduced mortality rates for these critical lung conditions.
Area of Science:
- Pediatric Critical Care Medicine
- Pulmonology
- Intensive Care Medicine
Background:
- Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) are critical conditions in pediatric intensive care units (PICUs).
- These syndromes involve severe lung inflammation and edema, affecting alveolar barriers.
- Incidence rates in children range from 8.5 to 16 per 1000 PICU admissions.
Purpose of the Study:
- To review the characteristics, treatment, and outcomes of ALI/ARDS in pediatric populations.
- To highlight current management strategies and their impact on patient outcomes.
- To discuss emerging therapeutic approaches for non-resolving cases.
Main Methods:
- Review of pathological phases of ARDS: inflammatory, proliferative, and fibrotic.
- Discussion of ventilatory strategies including optimal PEEP, low tidal volume, and FiO2.
- Evaluation of adjunctive therapies like prone positioning and potential roles for corticosteroids.
Main Results:
- Supportive care and control of the initiating cause are the cornerstones of ARDS treatment.
- Ventilator management aims to balance gas exchange with minimizing ventilator-induced lung injury.
- Prone positioning improves oxygenation; high-frequency ventilation's impact on outcomes is debated.
- Pharmacological interventions have shown limited impact, though corticosteroids show promise in specific cases.
Conclusions:
- Mortality rates for pediatric ALI/ARDS have decreased due to improved critical care support.
- Optimized supportive care, particularly mechanical ventilation strategies, is crucial.
- Further research into pharmacological treatments, including corticosteroids, may benefit non-resolving ARDS.
Abstract:
Acute lung injury and acute respiratory distress syndrome are an important challenge for pediatric intensive care units. These disorders are characterized by a significant inflammatory response to a local (pulmonary) or remote (systemic) insult resulting in injury to alveolar epithelial and endothelial barriers of the lung, acute inflammation and protein rich pulmonary edema. The reported rates in children vary from 8.5 to 16 cases / 1000 pediatric intensive care unit (PICU) admissions. The pathological features of ARDS are described as passing through three overlapping phases - an inflammatory or exudative phase (0-7 days), a proliferative phase (7-21 days) and lastly a fibrotic phase (from day 10). The treatment of ARDS rests on good supportive care and control of initiating cause. The goal of ventilating patients with ALI/ARDS should be to maintain adequate gas exchange with minimal ventilator induced lung injury. This can be achieved by use of optimum PEEP, low tidal volume and appropriate FiO2. High frequency ventilation can improve oxygenation but does affect the outcomes. Prone positioning is a useful strategy to improve oxygenation. Pharmacological strategies have not made any significant impact on the outcomes. Preliminary data suggests some role for use of corticosteroids in non-resolving ARDS. The mortality rates have declined over the last decade chiefly due to the advances in supporting critically ill patients.
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