Pulmonary edema is usually caused by heart failure that results in increased pressure in the pulmonary (lung) veins. However, problems within the lungs themselves can also result in fluid accumulation.

Pulmonary edema can be a complication of a myocardial infarction (heart attack), leaking or narrowed heart valves (mitral or aortic valves), or any disease of the heart that either results in weakening and/or stiffening of the heart muscle (cardiomyopathy). The failing heart transmits its increased pressure to the lung veins. As pressure in the lung veins rises, fluid is pushed into the air spaces (alveoli). This fluid then becomes a barrier to normal oxygen exchange, resulting in shortness of breath.

Pulmonary edema can also be caused by direct lung injury from toxins including heat and poisonous gas, severe infection, or an excess of body fluid as seen in kidney failure.

• Shortness of breath
• Difficulty breathing
• Feeling of "air hunger" or "drowning"
• Grunting or gurgling sounds with breathing
• Wheezing
• Shortness of breath with lying down, causing the patient to sleep with head propped up or using extra pillows
• Cough
• Anxiety
• Restlessness
• Excessive sweating
• Pale skin

• Nasal flaring
• Coughing up blood
• Inability to speak from air hunger
• Decrease in level of awareness

Signs:

• Rapid breathing and increased heart rate
• Listening to the chest with a stethoscope (auscultation) may reveal the following:
  • Crackles (rales) in the lungs
  • Abnormal heart sounds (murmurs, extra heart sounds)
• pale or blue skin color

Tests:

• Blood oxygen levels (low)
• A chest X-ray may reveal the following:
  • Fluid in or around the lung space
  • Enlarged heart
• An ultrasound of the heart (echocardiogram) may reveal the following:
  • Weak heart muscle
  • Leaking or narrow heart valves
  • Fluid surrounding the heart

Oxygen is given via nasal prongs or face mask. Intubation (breathing tube placed into the windpipe) and use of a breathing machine (ventilator) may be needed.

Underly causes must be rapidly identified and treated. For example, if a heart attack has caused the condition, the heart must be treated and stabilized. Medications to accelerate water excretion from the body via the urine (diuretics) are given. One common diuretic is lasix (furosemide). Other medications to strengthen the heart muscle or to relieve the pressure on the heart may also be given as needed.

Long-term dependence on a breathing machine (ventilator)

Go to the emergency room or call the local emergency number (such as 911) if conditions suggesting pulmonary edema occur, particularly if breathing is difficult.