Pulmonary Edema

What is Pulmonary Edema?

Human lungs contain microscopic air sacs called alveoli, which are responsible for absorbing oxygen and releasing carbon dioxide during breathing. Under normal conditions, a careful balance keeps these air sacs free of fluid, allowing oxygen to pass easily into the bloodstream.

When this balance is disrupted, fluid accumulates abnormally in and around these air sacs. This accumulation can happen due to several reasons, including heart failure, pneumonia, liver disease, high altitude, etc. This accumulation is called pulmonary edema.

What are the Types of Pulmonary Edema?

Pulmonary edema can be classified as acute or chronic depending on whether it has a sudden onset or develops slowly. Let us understand both types.

How Common is Pulmonary Edema in India?

Dedicated national-level data on pulmonary edema in India is limited, and much of what is available comes from smaller, localised studies. In high-altitude regions of India, pulmonary edema was found to be the most common serious illness requiring hospital admission, accounting for 5 to 10% of all medical ward admissions. Notably, almost half of the patients affected were aged 21-30.

In a separate study of patients admitted to an emergency department with pulmonary edema, men accounted for 64% of cases and women for 36%. The condition was most prevalent in patients aged 51 to 70, who accounted for over half of all cases. Among the 100 patients studied, 63 were found to have congestive heart failure as the underlying cause, while 37 had chronic kidney disease. The mortality rate in this group was 3%, underscoring that the condition can be life-threatening.

What are the Symptoms of Pulmonary Edema?

Symptoms of pulmonary edema can vary significantly depending on whether the condition develops suddenly or over time. Here are the symptoms to look for in each case:

What Causes Pulmonary Edema?

The causes of pulmonary edema are generally divided into heart-related (cardiogenic) and non-heart-related (non-cardiogenic) conditions.

Risk Factors of Pulmonary Edema

Several medical conditions, lifestyle factors, and environmental exposures can increase the chances of developing pulmonary edema. These include:

• Having Heart Conditions: Diseases that affect the heart are the most common risk factors. These include heart failure, coronary artery disease, high blood pressure, heart valve disease, irregular heart rhythms (arrhythmias), congenital heart defects, and cardiomyopathy.

• Diabetes: Diabetes increases the possibility of developing heart disease, which is a common cause of pulmonary edema.

• Sleep Apnea: This condition leads to abrupt pauses in breathing during sleep. This can strain the heart and contribute to fluid buildup in the lungs.

• Excessive Alcohol Consumption: Heavy alcohol use over time can weaken the heart and increase the chances of heart failure. Cardiomyopathy and heart failure are common causes of pulmonary edema.

• Lung Injury or Severe Illness: Conditions such as pneumonia, severe infections, smoke inhalation, near drowning, blood clots in the lungs, certain viral illnesses, or drug use can damage the lungs and cause pulmonary edema.

• High-Altitude Travel: Travelling quickly to places above 2,400 metres (8,000 feet) without allowing enough time to acclimatise can trigger high-altitude pulmonary edema (HAPE).

• Pulmonary Hypertension or Congenital Heart Defects in Children: Children with these underlying conditions have a greater risk of developing HAPE at high altitudes.

What are the Complications of Pulmonary Edema?

If pulmonary edema is not treated promptly, the reduced oxygen supply and ongoing fluid buildup can lead to several serious complications. These include:

• Severe Breathing Problems: As more fluid collects in the lungs, breathing becomes increasingly difficult, and blood oxygen levels may drop dangerously low.

• Respiratory Failure: In severe cases, the lungs may no longer be able to supply enough oxygen to the body, making mechanical ventilation necessary.

• Pulmonary Hypertension: Persistent fluid buildup can increase pressure in the blood vessels of the lungs, making it difficult for the heart to pump blood through them.

• Heart Failure: Increased pressure in the lungs places extra strain on the heart, which can weaken its pumping ability over time and worsen heart failure.

• Swelling in the Body: Fluid may also accumulate in the legs, feet, ankles, or abdomen as heart function declines.

• Pleural Effusion: Excess fluid can collect in the space surrounding the lungs, further affecting breathing.

• Liver Congestion and Swelling: Heart failure disrupts blood flow to the liver, which may cause fluid buildup and enlargement, impairing liver function.

When Should I See My Healthcare Provider?

Pulmonary edema is a medical emergency and can even be life-threatening, especially if it occurs suddenly or is due to a heart condition. If you experience any of the following, seek emergency medical help:

• Sudden shortness of breath

• Severe difficulty breathing

• A feeling of suffocation

• Wheezing or gasping while breathing

• Coughing up pink, frothy, or blood-tinged mucus.

Emergency care is also needed if you develop bluish or greyish skin, excessive sweating, confusion, dizziness, faintness, or a sudden drop in blood pressure. If you have already been diagnosed with pulmonary edema, any rapid worsening of your symptoms should also be treated as an emergency. Do not drive yourself to the hospital; call emergency medical services immediately.

How is Pulmonary Edema Diagnosed?

Pulmonary edema is diagnosed through physical examination, blood tests, imaging studies, and heart function tests. Here is the complete process:

How is Pulmonary Edema Treated?

The treatment of pulmonary edema focuses on improving oxygen levels, removing excess fluid from the lungs, and treating the underlying cause. Since acute pulmonary edema is a medical emergency, treatment usually begins immediately in a hospital.

• Oxygen Therapy: Supplemental oxygen is usually the first treatment to improve blood oxygen levels. It may be given through a face mask or nasal tubes.

• Breathing Support: If oxygen alone is not enough, non-invasive ventilation or a mechanical ventilator may be used to help the person breathe.

• Diuretics: Medicines such as furosemide help the body remove excess fluid through urine, reducing pressure in the heart and lungs.

• Medicines for Heart Function and Blood Pressure: Depending on the underlying cause, doctors may prescribe medicines to lower blood pressure or strengthen the heart's pumping ability.

• Treatment of the Underlying Cause: Managing the condition responsible for pulmonary edema is essential. This may include treating heart failure, infections, nervous system disorders, or other medical conditions with appropriate medicines such as antibiotics, corticosteroids, or other disease-specific treatments.

• Treatment for High-Altitude Pulmonary Edema (HAPE): People with HAPE should descend to a lower altitude as quickly as possible. Oxygen therapy, keeping warm, avoiding physical activity, and medicines such as acetazolamide or nifedipine may also be recommended in selected cases.

Can Pulmonary Edema be Prevented?

Pulmonary edema cannot always be prevented, as it often develops due to underlying heart or lung diseases. But here are a few things you can do to reduce the risk:

• Manage Heart and Lung Conditions: Take your prescribed medicines regularly, attend routine medical check-ups, and seek medical attention promptly if you notice worsening breathing problems.

• Control Blood Pressure and Cholesterol: Maintaining your cholesterol levels within the recommended range and keeping your blood pressure normal lowers the risk of heart disease, a major cause of pulmonary edema.

• Maintain a Healthy Weight: Achieving and maintaining a healthy body weight helps improve heart function and reduces the strain on the cardiovascular system.

• Exercise Regularly: Living an active lifestyle is good for heart health. It reduces the risk of heart conditions that can lead to pulmonary edema.

• Quit Smoking and Limit Alcohol: Staying away from tobacco and reducing alcohol intake can protect both your heart and lungs.

• Stay Up to Date with Vaccinations: Routine vaccinations can help reduce the risk of infections that may trigger pulmonary edema in susceptible individuals.

• Altitude Adjustment: If travelling to high altitudes, ascend gradually, avoid strenuous physical activity during the ascent, and speak to your doctor about preventive medicines if you are at increased risk.

What is the Prognosis of Pulmonary Edema?

Pulmonary edema is a serious condition. If you have acute (sudden) pulmonary edema, you need immediate treatment. You may be treated in the emergency room (ER) or intensive care unit (ICU). In acute pulmonary edema, time is critical. The condition can deteriorate rapidly, and immediate treatment is required. This offers better chances of recovery.

Chronic pulmonary edema is not as immediately life-threatening, but it still needs to be medically managed properly and, depending on the stage of the disease, may need hospitalisation as well.

Does Health Insurance Cover Pulmonary Edema?

Yes, health insurance generally covers the treatment of pulmonary edema. Most standard health insurance plans cover hospitalisation expenses, including eligible pre- and post-hospitalisation costs, diagnostic tests, prescribed medicines, surgery charges (if required), ICU expenses, ambulance charges, and other in-patient treatment costs. Some insurers also offer outpatient (OPD) consultations and diagnostic tests through optional add-on covers.

Since coverage, waiting periods, exclusions, and claim conditions vary between insurers, it is important to read the policy documents carefully before purchasing a health insurance plan.

How Much Health Insurance is Required for Pulmonary Edema?

Pulmonary edema often requires emergency treatment, and in severe cases, the cost of hospitalisation, ICU care, surgery, ventilator support, and treatment of the underlying condition can be substantial. Therefore, it is generally recommended to have a health insurance cover of at least ₹10 lakh to ₹15 lakh.

If you are older or have conditions that increase your risk of pulmonary edema, such as heart disease, high blood pressure, diabetes, a higher sum insured can be a wise idea.