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Pulmonary edema facts Pulmonary edema is typically caused by filling of alveoli in the
lungs by fluid leaking out of the blood.
Pulmonary edema may be caused by a number of cardiac or
non-cardiac conditions.
Breathing difficulty is the main manifestation of pulmonary
edema.
Treatment of the underlying cause of pulmonary edema is an
essential step in the management of pulmonary edema.
What is pulmonary edema?Comment on thisRead 11 Comments Share Your Story
Edema, in general, means swelling. This typically occurs when fluid
from inside blood vessels seeps outside the blood vessel into the
surrounding tissues, causing swelling. This can happen either
because of too much pressure in the blood vessels or not enough
proteins in the bloodstream to hold on to the fluid in the plasma (the
part of the blood that does not contain any blood cells).
Pulmonary edema is the term used when edema happens in the
lungs. The immediate area outside of the small blood vessels in the
lungs is occupied by very tiny air sacs called the alveoli. This is
where oxygen from the air is picked up by the blood passing by, and
carbon dioxide in the blood is passed into the alveoli to be exhaled
out. Alveoli normally have a thin wall that allows for this air
exchange, and fluids are usually kept out of the alveoli unless these
walls lose their integrity.
Picture of the alveoli and lung
Pulmonary edema occurs when the alveoli fill up with excess fluid
seeped out of the blood vessels in the lung instead of air. This can
cause problems with the exchange of gas (oxygen and carbon
dioxide), resulting in breathing difficulty and poor oxygenation of
blood. Sometimes, this can be referred to as "water in the lungs"
when describing the condition to patients.
Pulmonary edema can be caused by many different factors. It can
be related to heart failure, called cardiogenic pulmonary edema, or
related to other causes, referred to as non-cardiogenic pulmonary
edema.
What causes pulmonary edema?Comment on thisShare Your Story
As mentioned earlier, pulmonary edema can be broadly divided into cardiogenic
and non-cardiogenic causes. Some of the common causes are listed below.
Cardiogenic causes of pulmonary edemaCardiogenic causes of pulmonary edema results from high pressure in the blood
vessels of the lung due to poor heart function. Congestive heart failure due to poor
heart pumping function (arising from various causes such as arrhythmias and
diseases or weakness of the heart muscle), heart attacks, or abnormal heart valves
can lead to accumulation of more than the usual amount of blood in the blood
vessels of the lungs. This can, in turn, cause the fluid from the blood vessels to be
pushed out to the alveoli as the pressure builds up.
Non-cardiogenic pulmonary edemaNon-cardiogenic pulmonary edema can be commonly caused by the following:
Acute respiratory distress syndrome (ARDS), a potentially serious condition caused by severe infections, trauma, lung injury, inhalation of toxins, lung infections, cocaine smoking, or radiation to the lungs. In ARDS, the integrity of the alveoli become compromised as a result of underlying inflammatory response, and this leads to leaky alveoli that can fill up with fluid from the blood vessels.
Kidney failure and inability to excrete fluid from the body can cause fluid build-up in the blood vessels, resulting in pulmonary edema. In people with advanced kidney disease, dialysis may be necessary to remove the excess body fluid.
High altitude pulmonary edema, which can happen due to rapid ascent to high altitudes of more than 10,000 feet.
Brain trauma, bleeding in the brain (intracranial hemorrhage), severe seizures, or brain surgery can sometimes result in fluid accumulation in the lungs, causing neurogenic pulmonary edema.
A rapidly expanding lung can sometimes cause re-expansion pulmonary edema. This may happen in cases when the lung collapses (pneumothorax) or a large amount of fluid around the lung (pleural effusion) is removed, resulting in rapid expansion of the lung. This can result in pulmonary edema on the affected side only (unilateral pulmonary edema).
Rarely, an overdose on heroin or methadone can lead to pulmonary edema.
Aspirin overdose or chronic high dose use of aspirin can lead to aspirin intoxication, especially in the elderly, which may cause pulmonary edema.
Other more rare causes of non-cardiogenic pulmonary edema may include pulmonary embolism (blood clot which has traveled to the lungs), transfusion-related acute lung injury (TRALI), some viral infections, or eclampsia in pregnant women.
Medically Reviewed by a Doctor on 1/8/2014
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information.
What are the risk factors for pulmonary edema?The risk factors for pulmonary edema are essentially the underlying
causes of the condition. There isn't any specific risk factor for
pulmonary edema other than risk factors for the causative
conditions.
What are the symptoms of pulmonary edema?Comment on thisRead 3 Comments Share Your Story
The most common symptom of pulmonary edema isshortness of
breathor breathlessness. This may be of gradual onset if the
process slowly develops, or it can have a sudden onset in the case
of acute pulmonary edema.
Other common symptoms may include easy fatigue, more rapidly
developing shortness of breath than normal with usual activity
(dyspnea on exertion), rapid breathing (tachypnea), dizziness, or
weakness.
Low blood oxygen level (hypoxia) may be detected in patients with
pulmonary edema. Furthermore, upon examination of the lungs with
a stethoscope, the doctor may listen for abnormal lung sounds,
such as rales or crackles (discontinuous short bubbling sounds
corresponding to the splashing of the fluid in the alveoli during
breathing).
When should I seek medical care for pulmonary edema?Medical attention should be sought for anyone who is diagnosed
with pulmonary edema of any cause. Many causes of pulmonary
edema require hospitalization, especially if they are caused acutely.
In some cases of chronic (long term) pulmonary edema, for
example, with congestive heart failure, routine follow-up visits with
the treating doctor may be recommended.
Most cases of pulmonary edema are treated by internal medicine
doctors (internists), heart specialists (cardiologists), or lung doctors
(pulmonologists).
