Vocal Cord Dysfunction (VCD) means that your vocal cords do not act normally. With VCD, instead of your vocal cords opening up when you breathe in and out, your vocal cords close. This closing of your vocal cords makes it harder to get air into or out of your lungs.
An attack of VCD can be sudden and may be severe. Without treatment, a severe attack may require emergency room treatment. Even if an attack is severe, the oxygen level in your blood is usually normal. VCD symptoms do not usually occur during sleep.
There are many different possible causes of VCD. Often no cause can be found. VCD may be caused by:
VCD can be very hard to detect. Often people with VCD are thought to have asthma because the symptoms and triggers for VCD and asthma can be similar. The difference between VCD and asthma is that if you have asthma, medicines that open your breathing tubes (bronchodilators like albuterol) will improve your breathing. If you have VCD alone, the bronchodilator will not work. To make it even more confusing, you may have both VCD and asthma.
Your healthcare provider can find out if you have VCD by testing your breathing and looking at your vocal cords. The breathing test is called spirometry and must include a flow-volume loop. This test shows how well air moves in and out of your lungs. If you are having VCD symptoms during the test, the test will usually, but not always, show blockage mainly of the air flowing into the lungs. Breathing test results can be normal if your VCD is not active at the time of testing. This is one reason why it can be hard to determine if you have VCD.
The best way to tell if you have VCD is for your healthcare provider to look at your vocal cords when you are having difficulty breathing. To look at your vocal cords, a small, flexible fiberoptic tube (laryngoscope) is passed through your nose to the back of your throat where your vocal cords can be seen. Before the tube is put into your nose, medicine to numb your nose and throat is used. The test is usually done as an outpatient so you do not need to stay in the hospital. During the test, you are awake, and you may be asked to talk to see if your vocal cords are working normally.
You may be asked to exercise on a treadmill or cycle with the breathing testing or may inhale a medicine called methacholine during testing to try to bring on the VCD symptoms. If symptoms develop, a breathing test or laryngoscopy will be done to confirm the abnormal closure of the vocal cords.
VCD is different than many other breathing problems because medicines are not the main treatment to control or prevent VCD.
Authors: Brugman, S, Craven, D, Fahy, B, Hewitt, H, Sockrider, M.
Am J Respir Crit Care Med Vol. 174, P9-P10, 2006.
ATS Patient Education Series © 2006 American Thoracic Society
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