ARDS (Acute Respiratory Distress Syndrome)

Sudden, severe lung failure that requires emergency intensive care

Table of Contents

Quick Facts

  • Type: Critical respiratory illness
  • What happens: Fluid fills the lungs' air sacs
  • Common triggers: Severe infection, pneumonia, injury, sepsis
  • Care setting: Intensive care unit

Overview

Acute respiratory distress syndrome (ARDS) is a serious condition in which the tiny air sacs of the lungs (alveoli) become inflamed and fill with fluid. This prevents the lungs from properly transferring oxygen into the blood, so the body's organs do not get enough oxygen to work normally.

ARDS is a medical emergency that usually develops in people who are already seriously ill or injured. It comes on quickly, often within hours to a few days, and requires treatment in an intensive care unit, frequently with a breathing machine. While ARDS is life-threatening, many people who receive prompt, intensive care recover, though recovery can be prolonged.

Symptoms

Symptoms typically appear and worsen rapidly. They include:

  • Severe shortness of breath and rapid, labored breathing
  • A feeling of not being able to get enough air
  • Low oxygen levels, sometimes causing a bluish tinge to the lips or skin
  • Fast heartbeat
  • Confusion, extreme tiredness, or reduced alertness as oxygen falls

Severe difficulty breathing is an emergency. Because ARDS usually develops in people who are already hospitalized for another illness, the breathing trouble often appears on top of an existing serious condition.

Causes

ARDS develops when an injury or illness triggers widespread inflammation that damages the lungs and allows fluid to leak into the air sacs. Common triggers include:

  • Severe lung infection (pneumonia): Including from bacteria and viruses.
  • Sepsis: A dangerous, body-wide response to infection.
  • Serious injury or trauma: Including major accidents and chest injuries.
  • Inhaling harmful substances: Such as smoke or near-drowning.
  • Other causes: Severe inflammation of the pancreas, major blood transfusions, and certain drug reactions.

Risk Factors

  • Serious infections, especially pneumonia and sepsis
  • Major trauma or chest injury
  • Inhalation of smoke or toxic substances, or near-drowning
  • Severe inflammation of the pancreas
  • Chronic lung disease or heavy alcohol use
  • Being critically ill for another reason

Diagnosis

ARDS is diagnosed in the hospital based on the rapid onset of severe breathing trouble and low oxygen, along with tests:

  • Chest imaging: A chest X-ray or CT scan shows fluid in both lungs.
  • Blood oxygen testing: Measures how low oxygen levels have fallen.
  • Tests to find the cause: Such as blood and sputum cultures for infection.
  • Heart tests: To make sure the fluid in the lungs is not coming from heart failure, which can look similar.

Treatment

Treatment is provided in an intensive care unit and focuses on supporting the lungs and other organs while the underlying cause is treated.

  • Oxygen and ventilator support: Most people need a breathing machine to deliver oxygen and rest the lungs; settings are carefully managed to protect the lungs.
  • Treating the cause: For example, antibiotics for infection or surgery for injuries.
  • Careful fluid management: To avoid adding fluid to the lungs.
  • Positioning: Lying face-down (prone positioning) can improve oxygen levels in some patients.
  • Supportive care: Nutrition, prevention of complications, and treatment of other failing organs.

Recovery may take weeks to months, and some people have lingering breathing problems, weakness, or fatigue.

Prevention

ARDS cannot always be prevented, but the risk can be lowered by preventing and promptly treating its triggers:

  • Seek early treatment for serious infections such as pneumonia and sepsis
  • Stay up to date on recommended vaccinations against respiratory infections
  • Avoid smoking and limit heavy alcohol use, which can worsen lung injury
  • Take precautions to prevent injuries and inhalation of harmful substances
  • Follow medical advice closely when critically ill

When to See a Doctor

Call emergency services immediately for severe shortness of breath, gasping, a feeling of not getting enough air, or bluish lips or skin. These are emergency warning signs.

ARDS usually arises in people already hospitalized with a serious illness, and worsening breathing in that setting needs urgent attention from the medical team. If you are recovering at home from a serious infection or injury and develop rapidly worsening breathlessness, treat it as an emergency.

Related Topics

Acute Respiratory Distress Syndrome

Detailed overview of ARDS.

 Pneumonia

A common infection that can trigger ARDS.

 Sepsis

A body-wide infection response that often leads to ARDS.

 Pulmonary Edema

Fluid in the lungs from other causes, which can resemble ARDS.

Frequently Asked Questions

Is ARDS the same as pneumonia?

No, though they are related. Pneumonia is an infection of the lungs and is one of the common triggers of ARDS. ARDS is a more severe, widespread reaction in which fluid floods the air sacs of both lungs, causing dangerously low oxygen and usually requiring intensive care.

Can you recover from ARDS?

Yes, many people recover with prompt intensive care, though it is a serious, life-threatening condition. Recovery can take weeks to months, and some people are left with lingering breathlessness, muscle weakness, or fatigue that improves over time with rehabilitation.

What causes ARDS?

ARDS is triggered by conditions that cause severe lung inflammation, most often serious infections like pneumonia and sepsis, major trauma, inhaling smoke or harmful substances, near-drowning, and severe pancreatitis. The trigger leads to fluid leaking into the lungs' air sacs.

Why do people with ARDS need a ventilator?

Because the lungs cannot transfer enough oxygen into the blood, most people with ARDS need a breathing machine to deliver oxygen and support breathing while the lungs heal. The ventilator settings are carefully adjusted to protect the already-injured lungs.

When should I get emergency help for breathing problems?

Severe shortness of breath, gasping for air, a feeling of suffocating, or bluish lips or skin are emergencies. Call emergency services right away, especially if you are recovering from a serious infection or injury, since these can be signs of ARDS or other dangerous lung problems.

Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions about a medical condition.

References

  1. National Heart, Lung, and Blood Institute (NHLBI). ARDS (Acute Respiratory Distress Syndrome).
  2. Mayo Clinic. ARDS — Symptoms and causes.
  3. MedlinePlus, U.S. National Library of Medicine. Acute respiratory distress syndrome.
  4. American Lung Association. Learn About ARDS.