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The pulmonary artery is the main vessel that carries blood from the heart to the lungs. For a person at rest, blood pressure in a normal pulmonary artery is about 15 millimeters of mercury (mm Hg). In an individual with pulmonary hypertension, the average pressure in the pulmonary artery can be more than 25 mm Hg. This increase in pulmonary artery pressure occurs when the small arteries of the lungs become abnormally narrow. This condition can eventually lead to heart failure and death. Pulmonary hypertension can be idiopathic (unknown cause), familial (runs in families and is often linked to a genetic cause), or associated with other medical conditions. The October 7, 2009, issue of JAMA includes an article about the effects of iron supplementation on pulmonary hypertension due to low oxygen levels at high altitudes. This Patient Page is based on one published in the January 23, 2008, issue of JAMA.
Low oxygen levels due to high altitude or heart or lung disorders
Connective tissue diseases (autoimmune diseases such as scleroderma, sarcoidosis, or lupus)
Portal hypertension (resulting from liver disease)
Drugs and toxins (appetite suppressants, cocaine, amphetamines)
Myeloproliferative disorders (overproduction of red or white blood cells)
Hemoglobinopathies (abnormal oxygen-carrying proteins in red blood cells, such as found in sickle cell anemia)
Blood clots in pulmonary arteries
Initial symptoms may be minor and diagnosis may be delayed for several years until symptoms worsen. Typical symptoms may include
Shortness of breath following exertion
Dizziness and fainting
Bluish lips and skin
There is not one specific way to diagnose pulmonary hypertension. A doctor usually runs a series of tests to measure blood pressure in the pulmonary arteries, determine how well the heart and lungs are working, and rule out other diseases.
Pulmonary Hypertension Associationhttp://www.phassociation.org
American Lung Associationhttp://www.lungusa.org
National Heart, Lung, and Blood Institutehttp://www.nhlbi.nih.gov
To find this and previous JAMA Patient Pages, go to the Patient Page link on JAMA's Web site at http://www.jama.com. Many are available in English and Spanish. A previous Patient Page on the evaluation of lung function was published in the May 16, 2007, issue.
Sources: American Lung Association; National Heart, Lung, and Blood Institute; Pulmonary Hypertension Association
The JAMA Patient Page is a public service of JAMA. The information and recommendations appearing on this page are appropriate in most instances, but they are not a substitute for medical diagnosis. For specific information concerning your personal medical condition, JAMA suggests that you consult your physician. This page may be photocopied noncommercially by physicians and other health care professionals to share with patients. To purchase bulk reprints, call 312/464-0776.
TOPIC: LUNG DISEASE
Zeller JL, Burke AE, Glass RM. Pulmonary Hypertension. JAMA. 2009;302(13):1490. doi:10.1001/jama.302.13.1490
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