My son has a moderate allergy condition. His doctor has given him two inhalers
to use. The first is called Intal and he is to use it three times daily. The
other is Proventil. I believe that this is to be used on an as-needed basis.
However, there is some confusion within the family as to when this medication
should be used. I have found that on occasion, the Proventil has been used
when it may not have been needed. Is the Proventil dangerous when used in this
manner? Thank you in advance.
Kevin Destefino -- Greensburg, Pennsylvania
DR. ALAN GREENE:
Asthma is one of the most common disorders affecting children. As many as
10% of children have some degree of asthma, and the number has been rising
steadily since about 1980. Thankfully, advances in the diagnosis and treatment
of asthma have dramatically improved life for these children. Today most children
with properly managed asthma can lead a life unhindered by their disease. It
shouldn't hold them back from even the highest levels of athletic competition,
as recent Olympic gold medalists have shown.
Having said that, the death rate from asthma increased 46% in the last decade
in spite of these treatment advances. A major cause of this increase in mortality
is improper use of inhalers. Often children are handed several inhalers and
never really understand the different functions and uses of each one.
Asthma is a chronic lung disease characterized by tight airways -- a result
of airway hyper-responsiveness. Our airways are designed to be responsive to
harmful substances in the air. If we walk through clouds of smoke, our airways
will shrink, protecting our delicate lung tissues from the noxious ingredients
in the smoke. They should return to normal when we begin to breathe fresh air.
People with asthma have an exaggerated tightening response.
Different people with asthma respond to different "triggers" such as smoke,
allergens, air pollution, irritating fumes, viral infections, or cold air.
When we exercise, we breathe rapidly and are unable to bring air temperature
all the way up to 98.6° F -- particularly if we breathe through the mouth.
Thus asthmatics who are sensitive to cold air will often wheeze with exercise.
(Wheezing, the classic asthma symptom, is the noise made by air moving through
these tight airways.) Because asthmatics respond differently to different triggers,
their airways are tighter at some times than at others. Reducing exposure to
triggers can be a powerful way to improve asthma and reduce the need for medications.
Hyper-responsive airways tighten in three ways in response to triggers. First
and most immediately, smooth muscle surrounding the airways constricts, narrowing
the caliber of the airways. Second, the airways are narrowed by inflammation
and swelling of the airway lining. This leads to the third component of airway
narrowing, which is the accumulation of mucus and other fluids, which can plug
The goal of asthma therapy is for children to maintain their normal activity
levels while free from symptoms such as wheezing, coughing, or breathlessness.
The different inhalers that you mentioned, albuterol (Proventil or Ventolin)
and cromolyn (Intal) belong to two different classes of asthma medications
that work entirely differently. Albuterol (Ventolin or Proventil) works almost
instantly to relax the smooth muscles surrounding the airways. It quickly opens
the airways and reduces symptoms.
Unfortunately its success is its greatest danger. All too often, children
with wheezing will use a Proventil inhaler alone to treat the symptoms. Each
time they use a puff of the inhaler they feel better, but all the while the
airway lining is swelling and filling with mucus and fluid. Finally the symptoms
come back, but the Proventil inhaler is no longer effective since the airway
muscles are already as relaxed as they can get. At that point it is too late
to relieve the swelling and inflammation -- and the child suffocates.
Cromolyn (Intal) is an anti-inflammatory agent that works slowly to prevent
inflammation and swelling. It helps blunt the airways' hyper-responsiveness.
It is not useful as an emergency drug.
More recently, the use of medications called "inhaled corticosteroids" has
been emphasized. Like Cromolyn, these medications work by preventing inflammation
and decreasing the sensitivity of the lungs to inciting agents.
The National Asthma Education and Prevention Program convened an expert panel
to propose guidelines for the stepwise management of asthma. Asthma severity
is divided into four categories based on frequency of symptoms, including wheezing,
cough, shortness of breath, or chest tightness. For older children, pulmonary
(lung) function tests can also be used to differentiate the categories.
- Severe persistent: Continual symptoms including frequent night symptoms.
- Moderate persistent: Symptoms daily and night symptoms greater than 1 night
- Mild persistent: Symptoms greater than 2 days a week and night symptoms
greater than 2 nights a month.
- Mild intermittent: Symptoms less than or equal to 2 times a week with night
symptoms less than or equal to 2 times a month.
Those who fall into the mild intermittent category do not require any preventative
treatments. Those in any of the persistent categories will benefit from preventative
therapy such as inhaled steroids.
Regardless of the category of asthma, children should be given a relief medicine,
such as albuterol, to treat immediate asthma symptoms. There is no virtue to
holding off treatment with albuterol if your child has symptoms. It is better
to go ahead and use the Proventil. If the use becomes frequent, an additional
anti-inflammatory medicine is needed. For some children, a home peak-flow meter
is used to assess the amount of airway obstruction and the amount and type
of medications needed. I would recommend this for anyone who is old enough
to use a peak flow meter.
I applaud you for recognizing that your son's inhalers serve different functions.
All too many families are left with the mistaken understanding that the inhalers
are interchangeable. The more you and your son understand about asthma and
its treatment the less it will impact his life.
Alan Greene, M.D., earned a bachelor's degree from Princeton University
and graduated from medical school at University of California at San Francisco.
Upon completion of his pediatric residency program at Children's Hospital
Medical Center of Northern California in 1993, he served as Chief Resident.
During his Chief year, Dr. Greene passed the pediatric boards in the top
5% of the nation.
Dr. Greene entered primary care pediatrics in January 1993. He is on the
Clinical Faculty at Stanford University School of Medicine where he sees
patients and teaches Residents. He serves as the Chief Medical Officer of
A.D.A.M., Inc., a leading provider of consumer health information, and helps
direct A.D.A.M.'s editorial process. As A.D.A.M.'s CMO, he served as a founding
member of Hi-Ethics (Health Internet Ethics) and helped URAC develop its
standards for eHealth accreditation. He is also the Founder & CEO of
DrGreene.com. Dr. Greene was also named Intel's Internet Health Hero for
children's health. He is an author, medical expert, and a media personality.
Dr. Greene is the author of Raising Baby Green (Wiley Books,
2007), From First Kicks to First Steps (McGraw-Hill, 2004), and The
Parent’s Complete Guide to Ear Infections (Avon Books, 1997). He
is also a co-author of The A.D.A.M. Illustrated Family Health Guide (A.D.A.M.,
Inc., 2004).Dr. Greene has appeared in numerous publications including the Wall
Street Journal, Parenting, Parent, Child, American Baby, Baby Talk, Working
Mother, Better Home's & Gardens, and Reader's Digest. He
also appears frequently on television and radio shows as a medical expert.
Review Date: 5/16/2007
Reviewed By: Alan Greene, M.D., F.A.A.P., Department of Pediatrics, Packard Children's Hospital, Stanford University School of Medicine; Chief Medical Officer, A.D.A.M., Inc.
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