COPD vs. Emphysema

COPD is a general term that includes emphysema.

The COPD acronym means chronic obstructive pulmonary disease. COPD is a general term that now includes emphysema, chronic bronchitis, certain types of bronchiectasis and by some doctors and researchers, asthma. Consequently, emphysema is a type of COPD. Not all doctors agree with this evolving terminology.

The signs and symptoms are the same for COPD and emphysema because emphysema is a type of late-stage COPD. These symptoms mainly affect the respiratory tract and include:

• Shortness of breath (dyspnea)
• Cough (usually in the AM) with some sputum
• Wheezing
• Increasing exercise intolerance

People often have other types of COPD, for example, asthma, chronic bronchitis, and bronchiectasis, before they develop emphysema. Each of these types have their own characteristic symptoms and severity of symptoms, but because COPD generally progresses and worsens over time, these symptoms worsen as well.

There is quite a bit of overlap of symptoms between all of the types of COPD. Doctors consider emphysema the "end-stage" of COPD, where respiratory symptoms and shortness of breath can be so severe you require constant oxygen, and it becomes debilitating.

There are no differences between COPD and emphysema if you consider emphysema to be a type of end-stage of COPD. However, emphysema (or end-stage, type 3-4 COPD) has permanent destructive tissue changes seen on biopsy samples that are different from the earlier stages or types of COPD.

If you consider COPD and emphysema as the same disease, there are no differences in the causes, for example, smoking, secondhand smoke, immune-mediated tissue changes, inhaling toxic substances, and/or alpha-1-antitrypsin deficiency. However, by far, the number one cause of COPD (and emphysema) is cigarette smoking.

Things that make symptoms worse for all types of COPD, and especially emphysema are the same. COPD and emphysema are slowly progressive diseases that worsen over time (sometimes even with treatment).

• If you inhale irritants, for example, noxious chemicals or particle debris (lung tissue toxins), and/or allergens your breathing will worsen.
• If you continue smoking, it will cause a more rapid deterioration in your lung function and cause more severe COPD symptoms.
• Bacterial, fungal, or viral upper respiratory infections also will make COPD worse.
• If you have other health problems in addition to COPD and emphysema, for example, cardiomyopathy, obesity, congestive heart failure, pneumonia, or lung cancer, your COPD and emphysema symptoms will worsen.

There are two common staging systems for COPD, the GOLD system, and the BODE index.

The GOLD system measures your breathing air volume (FEV₁) as compared to normal predicted breathing and designates your breathing into one of four COPD stages are:

• Stage 1 or Mild (80% of normal)
• Stage 2 or Moderate (50-80%)
• Stage 3 or Severe (30-50%) emphysema
• Stage 4 or Very severe, (less than 30%), end-stage, severe or end-stage emphysema

The BODE index attempts to place your COPD into one of four survival stages based on body mass, airflow obstruction, shortness of breath, and exercise capacity by a point system.

Talk to your doctor to discuss these staging systems and how they may relate tour individual problem and treatment.

Using the GOLD system (as used in COPD), doctors classify COPD and emphysema as stages 1-4 with 4 being the worst or most severe stage.

Doctors use the same tests to diagnose COPD and/or emphysema. The tests may include:

• Your history, family history, and physical exam
• Arterial blood gas
• Hematocrit
• Serum bicarbonate
• Alpha-1-antitrypsin level
• Sputum exam
• Chest x-ray
• Chest CT
• Pulmonary function tests (FEV₁) and staging

The treatments for both COPD and emphysema are the same:

• Stop smoking
• Bronchodilators (short and long acting)
• Long acting beta agonists
• Long acting muscarinic agonists
• Phosphodiesterase inhibitors
• Anti-inflammatory drugs
• Antibiotics (as needed)
• Mucolytic agents
• Oxygen therapy

Other medications or treatments may be helpful or needed in special circumstances, for example, alpha-1-antitrypsin replacement, or mechanical assisted breathing for a short time).

Your doctor may recommend surgery to reduce your symptoms and/or to help restore some of your lung function. Surgical procedures your doctor may discuss with you include removing the nonfunctional air sacs in your lungs (large bullae) to decompress lung tissue, lung volume reduction to decrease lung hyperinflation, endobronchial valve placement, and lung transplant.

You and your medical team (primary care, pulmonologist, and surgeon) will discuss what treatments would be best for your health care.

It is possible to slow the progression of COPD/emphysema by quitting smoking, medical and/or other surgical treatments, and physical therapy. However, even with aggressive and appropriate treatment often COPD will progress.

Symptoms and complications can be treated and managed, however, here is no cure for COPD/emphysema.

The life expectancy can be estimated for COPD/emphysema by the BODE index previously mentioned. However, it is not possible to determine accurate life expectancy for these patients because of so many variables that may change. Nonetheless, types 3- 4 COPD/emphysema puts you at risk for many serious or fatal complications like pneumonia or heart failure. For this reason, some doctors consider types 3-4 COPD/emphysema to be a life threatening disease.