Benign Stridor Often Mistaken for Laryngospasm

Laryngospasm causes a high-pitched squeak or wheezing sound when a person is trying to breath due to abnormal vocal cord movement. Watch video regarding this condition.

Larygnospasm (the most severe form of vocal cord dysfunction) is commonly misdiagnosed as asthma and patients may go for years labelled as asthmatic even though they may not have it at all.

However, though laryngospasm is often the victim of misdiagnosis, there is a condition known as non-organic stridor which is often misdiagnosed as laryngospasm (culprit as well as victim of misdiagnosis).

Here is a video example (watch the movie clip all the way to the end) of a patient with non-organic stridor who was initially misdiagnosed with asthma, than misdiagnosed as having vocal cord dysfunction/laryngospasm before being finally correctly diagnosed with having non-organic stridor.

As you can see, the vocal cords remain apart which immediately rules out the diagnosis of laryngospasm.

What is also apparent is the wheeze or stridor noise is due to vocal cord vibration while they are apart.

The fast moving inhalation/exhalation literally rattles the vocal cord membranes just like a strong wind flaps around an American flag resulting in "noise". No need for the vocal cords to come together to create the noise. The fast moving air does it all by itself.

The existence of non-organic stridor is one of the main reasons why laryngoscopy during a "breathing attack" suspected to be due laryngospasm is so important.

It's also why I have my patients run around my office until they become symptomatic before I perform this exam. Why do an exam when breathing is completely normal???

What is the treatment? Just reassurance... Given it is the fast-moving air that is causing the noise, one simply has to slow the breathing down. No inhalers, no epinephrine, no medications are needed.

For whatever reason, by far the most common patient who suffers from non-organic stridor is a female high school athlete.

Laryngospasm in a Child

Washington Post published a story July 23, 2012 regarding a child who suffered from laryngospasm attack that was erroneously diagnosed as asthma.

Laryngospasm is when the true vocal cords (TVC) come together rather than apart when breathing. Normally, only when talking do the vocal cords come together (or adduct) and vibrate to create a voice. When breathing, the vocal cords separate (or abduct) to allow air to pass between the vocal cords and into the lungs. Watch video.

What the story portrayed is not uncommon and patients who suffer from laryngospasm may go for years without the correct diagnosis.

The voice therapy that was recommended is also appropriate to help him cope when an attack occurs.

However, that's also the point where I start to disagree with the article.

It is all fine and dandy to learn breathing coping strategies, but that only deals with WHEN an attack occurs. What about what causes an attack to happen in the first place? Would it not be better to prevent an attack from happening at all and thereby coping strategies don't even need to be initiated?

As such, I do feel it important to start an aggressive workup to evaluate all the known triggers that may initiate a laryngospasm attack. Such triggers include allergy, post-nasal drainage, and reflux.

As long as the trigger is not addressed, a patient can continue to suffer recurrent attacks.

Once the triggers are found and fixed... the laryngospasm attacks can be "cured."

Watch the video below depicting larygnospasm as well as less severe forms of the same (vocal cord dysfunction or paradoxical vocal cords).

Source:
Long-ago asthma diagnosis didn’t explain boy’s difficulty breathing. Washington Post 7/23/12

Video of Exercise Induced Vocal Cord Dysfunction

Vocal cord dysfunction (also known as paradoxical vocal cord movement) is a condition where the true vocal cords (TVC) do not move the way they are supposed to. Normally, the vocal cords move apart (abduct) when breathing and come together (adduct) when talking.

Vocal cord dysfunction is when the vocal cords adduct (come together) when breathing resulting in shortness of breath and at its worst, complete airway obstruction resulting in stridor known as laryngospasm.

The video shown here shows a patient with exercise induced vocal cord dysfunction (her breathing attacks occur only with exercise). The first part of the video shows this patient at rest breathing normally. The latter half of the video shows the patient after exercising and suffering from a mild case of vocal cord dysfunction.

Note how the vocal cords come together briefly with inhalation causing the patient to perceive inadequate breathing.

Treatment depends on finding the trigger and addressing the trigger whether it be allergy, reflux, etc. If all possible triggers have been ruled-out, neuropathic medications like neurontin and elavil can be tried. If the side effects are unacceptable or the medications just do not work, botox injections to the vocal cords can be performed.

Speech therapy can also be pursued in order to learn coping mechanisms to help a patient deal with an attack when it happens.