Acute respiratory distress syndrome is a severe, rapidly developing form of respiratory failure in which the lungs become widely inflamed and fill with fluid, so oxygen can no longer cross into the blood. It is a medical emergency treated in intensive care. ARDS treatment requires experienced critical care, and Dr. Ajit Yadav's training in critical care covers both the ventilatory management of these patients and the lung follow-up that recovery requires.
What ARDS is
ARDS is not a disease in itself but a response of the lungs to a severe insult, either within the lungs or elsewhere in the body. The membrane between the air sacs and the blood vessels becomes leaky. Fluid and inflammatory cells flood into the air sacs, the lungs become stiff, and areas collapse. Oxygen levels fall despite high concentrations of supplemental oxygen, and the work of breathing rises steeply.
Because the lungs become stiff and unevenly affected, the way a ventilator is set matters enormously — the wrong settings can worsen the injury.
What causes it
Direct lung injury: severe pneumonia — bacterial, viral including influenza and COVID-19, or fungal; aspiration of stomach contents; inhalation of smoke or toxic gases; near-drowning; chest trauma or lung contusion.
Indirect injury: sepsis from any source, which is the commonest cause overall; severe trauma; acute pancreatitis; major surgery; massive blood transfusion; severe burns; and some drug reactions.
Symptoms and recognition
ARDS develops rapidly, usually within a week of the triggering event and often within twenty-four to forty-eight hours:
- Severe breathlessness and very rapid breathing
- Oxygen levels that stay low despite high-flow oxygen
- Rapid heart rate, agitation, and later confusion or drowsiness
- Widespread crackles on examination
- Chest imaging showing changes in both lungs that are not explained by heart failure or fluid overload alone
Diagnosis rests on the timing of onset, bilateral changes on imaging, a measured degree of impaired oxygenation, and exclusion of cardiac failure as the sole explanation. Severity is graded as mild, moderate or severe on that oxygenation measure, and grading guides treatment.
Treatment
ARDS is managed in an intensive care unit. The two aims are supporting the lungs while limiting further injury, and treating whatever caused it.
- Lung-protective ventilation is the single most important intervention. Small tidal volumes and controlled airway pressures reduce further damage and improve survival. Careful use of PEEP keeps collapsed lung units open.
- Prone positioning — nursing the patient face-down for extended periods — improves oxygenation and survival in moderate to severe ARDS.
- Treating the underlying cause — antibiotics for sepsis, source control, antivirals where appropriate. Without this, lung support alone will not succeed.
- Careful fluid management, since excess fluid worsens lung oedema.
- Sedation, and neuromuscular blockade in selected severe cases, to allow ventilation without the patient fighting it.
- Non-invasive ventilation or high-flow nasal oxygen in milder cases, with close monitoring for the need to escalate.
- ECMO in specialist centres for the most severe cases unresponsive to conventional support.
- Supportive care — nutrition, prevention of blood clots, stress ulcer prophylaxis, and prevention of ventilator-associated infection.
Recovery and what follows
Survivors of ARDS often face a long recovery. Breathlessness and reduced exercise capacity are common for months. Muscle weakness after prolonged ICU care is frequent and improves with rehabilitation. Lung function usually improves over six to twelve months and may return close to normal, though some patients retain a degree of scarring. Fatigue, low mood, anxiety and difficulties with memory and concentration are common and are a recognised part of post-intensive-care syndrome rather than a personal failing.
Follow-up after discharge matters: repeat lung function testing and imaging track recovery, breathlessness and exercise capacity are assessed, oxygen needs are reviewed, and pulmonary rehabilitation is arranged where it will help.
When to seek help
ARDS itself is an emergency — severe breathlessness, blue lips, confusion or drowsiness require immediate hospital care, not a clinic appointment.
Book a consultation at Vaayu Care if you are recovering after ARDS or a prolonged ICU stay and remain breathless, if your exercise capacity has not returned, if you need oxygen at home and want it reassessed, or if a scan taken during your illness showed changes that need following up. Book an appointment.
Frequently asked questions
Is ARDS the same as pneumonia?
No, although severe pneumonia is one of the commonest causes of ARDS. Pneumonia is an infection of lung tissue, usually affecting part of the lung. ARDS is a widespread inflammatory reaction affecting both lungs, in which the lungs become stiff and leaky and oxygen cannot cross into the blood. ARDS can also follow sepsis, trauma, pancreatitis or major surgery with no lung infection at all.
Can someone fully recover from ARDS?
Many do. Lung function typically improves over six to twelve months and can return close to normal, though some patients retain scarring and reduced exercise capacity. Muscle weakness, fatigue and difficulties with memory and mood after prolonged intensive care are common and improve with rehabilitation and time.
Why is prone positioning used?
Lying face-down redistributes air and blood flow within the lungs more evenly, opens collapsed areas at the back of the lung, and reduces the pressure the heart and abdomen place on lung tissue. In moderate to severe ARDS, extended prone positioning improves oxygenation and has been shown to improve survival.
How long does a patient stay on a ventilator with ARDS?
It varies widely with cause and severity — from a few days in mild cases to several weeks in severe ones. Weaning begins as soon as oxygenation improves and the underlying cause is controlled. Some patients need a tracheostomy to allow gradual weaning and better comfort during a prolonged stay.
Will I need long-term oxygen after ARDS?
Most survivors do not. Some need oxygen for weeks to months while the lungs heal, and it is reduced as recovery progresses. A small number with significant residual scarring need it long term. Requirements are reassessed with formal testing rather than continued indefinitely by default.