Keeping asthma at bay

If yu’ve never seen a patient struggling for air during an acute asthma attack, chances
are you will. Asthma prevalence is rising. About 22 million Americans have the disorder—
6 million of them children. Every year, asthma puts nearly half a million people in the
hospital and kills an estimated 4,000.

But thanks in part to better diagnosis and management, the big picture is improving.
Asthma has been causing fewer deaths than before, and the overall hospitalization rate
has been relatively stable in the last decade. Also, fewer patients say the disease limits
their activities, and more are getting formal asthma education.

New clinical practice guidelines

In August 2007, the National Asthma Education and Prevention Program (part of the
National Heart, Lung, and Blood Institute) issued a comprehensive update of clinical
guidelines for asthma diagnosis and management. (The first guidelines were issued in
1991 and updated in 1997; a 2002 update addressed selected topics.)

Known as the Expert Panel Report 3 (EPR-3), the 2007 guidelines stress the need to
control asthma, describe new approaches for asthma monitoring, and add a new age-
group to childhood asthma management. They also offer new recommendations on drug
therapy, patient teaching in myriad settings, and control of environmental factors that
trigger asthma symptoms.

Recognizing that asthma can change over time and varies among individuals and by age-
groups, EPR-3 underscores the importance of regularly monitoring the patient’s level of
asthma control. Like earlier guidelines, it recommends inhaled corticosteroids as the best
long-term control treatment for patients of all ages, based on the emergence of even
stronger evidence that these drugs reduce inflammation safely and effectively. This article
discusses key points of EPR-3.

Main components of asthma care

EPR-3 organizes asthma care around four components:

 assessment and monitoring measures

 education for a partnership in asthma care
 control of environmental factors and comorbid conditions that affect asthma
 drug therapy.

Assessment and monitoring measures

In a new approach, EPR-3 uses multiple measures of the patient’s level of current
impairment and future risk for asthma assessment and monitoring. (Some patients can
be at high risk for frequent exacerbations despite having few day-to-day effects of
asthma.)

 Impairment refers to symptom frequency and intensity, as well as the patient’s

current or recent functional limitations.
 Risk is the likelihood that the patient will experience asthma exacerbations,
progressive decline in lung function (or in children, lung growth), or adverse drug
effects.

Impairment and risk represent different manifestations of asthma. They may not correlate
with each other and may respond differently to treatment.

Goal of asthma therapy

According to EPR-3, monitoring the patient’s asthma control is the goal of therapy. The
new guidelines refine the key elements of assessment and monitoring to include the
separate but related concepts of severity, control, and responsiveness to treatment.

 Severity refers to the intrinsic intensity of the disease. Clinicians should assess
severity to guide the patient’s initial therapy. Measuring severity is easiest in a
patient not on long-term control therapy.
 Control is the degree to which therapeutic interventions minimize asthma and the
goals of therapy are met. Clinicians should use the level of control to assess and
monitor a patient’s asthma control and guide decisions to maintain or adjust
therapy.
 Responsiveness refers to the ease with which therapy achieves asthma control.

Other key changes from previous guidelines

In classifying asthma severity, EPR-3 has changed the mild intermittent category to
intermittent—underscoring the reality that severe exacerbations can occur in patients who
have any severity level. With any category of persistent asthma, acute exacerbations may
be mild, moderate, or severe.

In another change from earlier guidelines, EPR-3 stresses use of the ratio of forced
expiratory volume in 1 second (FEV1) to forced vital capacity to classify severity in
children—because this ratio may be a more sensitive measure than FEV1 alone.

Education for a partnership in asthma care

EPR-3 identifies the following goals of patient education:

 Increase the patient’s understanding of asthma.

 Improve self-treatment skills.
  Enhance patient satisfaction.
 Boost patient confidence.
 Increase the patient’s and family’s adherence with the treatment program.

Providing asthma self-management education allows patients to gain the skills they need
to control asthma and improve outcomes. EPR-3 advises clinicians to integrate asthma
self-management teaching into all aspects of asthma care.

It also emphasizes the many points of care outside the physician’s office, clinic, or hospital
setting in which patients can receive asthma education. Increasing evidence shows the
benefits of patient education programs delivered in a wide range of points of care;

educating patients at these points promotes a network of support outside the clinician’s
office.

Essential self-management teaching

Asthma self-management education should include:

 asthma information and training in asthma management skills

 self-monitoring (based on either symptoms or peak flow)
 a written asthma action plan that addresses daily management as well as
recognition and handling of worsening asthma
 regular assessment by a consistent clinician.

A review of 22 studies found that self-management training led to significant benefits

(reduced morbidity and decreased use of healthcare services) and that these benefits
were greatest when written self-management asthma action plans were used.

Nurse’s role in education

Effective patient education calls for a partnership between the patient and healthcare
provider. Nurses play a major role in asthma education. Recent studies showed that
patients taught by nurses had significantly lower symptom scores and fewer physician
visits and urgent care visits for asthma after 6 months. When teaching patients, be sure
to use simple language.

Control of environmental factors and comorbid conditions

To manage asthma successfully long-term, EPR-3 urges clinicians to help patients

identify and reduce exposure to known allergens and irritants and to control comorbid
conditions and other factors that worsen symptoms or trigger exacerbations.

 To control allergen-induced asthma, patients should reduce exposure to indoor

and outdoor allergens to which they’re sensitive.
  When asthma can’t be well-controlled, clinicians should evaluate patients for
chronic comorbid conditions, such as allergic bronchopulmonary aspergillosis,
gastroesophageal reflux, obesity, obstructive sleep apnea, rhinitis, sinusitis, and
chronic stress or depression. These conditions can impede asthma management;
evidence suggests that treating them can improve asthma control.

Drug therapy

Drug therapy is used to prevent and control asthma symptoms, improve quality of life,
decrease frequency and severity of exacerbations, and reverse airflow obstruction.
Regarding drug therapy, EPR-3 diverges from earlier recommendations in several
important areas.

Drugs used to treat asthma fall into two general classes:

 long-term controller medications used daily to achieve and maintain control of

persistent asthma
 quick-relief medications that promptly reverse acute airflow obstruction caused by
bronchoconstriction.

Long-term controller medications

The most effective drugs for long-term therapy are those with anti-inflammatory effects.
Long-term medications include corticosteroids (inhaled and systemic), cromolyn sodium
and nedocromil, immunomodulators, leukotriene modifiers, long-acting beta2-agonists
(LABAs), and methylxanthines (theophylline).

Corticosteroids. These are the most potent anti-inflammatory drugs. Asthma patients may
receive inhaled or systemic forms.

Inhaled corticosteroids (ICSs) are the most effective long-term control drugs for persistent
asthma. At recommended dosages, they’re generally safe and well-tolerated.

ICSs inhibit both airway microvascular leakage and increased mucus secretion in the
airways. They also augment expression of beta receptors on smooth-muscle cells, which
magnifies beta-adrenergic bronchodilator responsiveness. In both children and adults,
ICSs improve asthma control more effectively than any other single long-term control
drug, reducing both impairment and the exacerbation risk. However, they don’t influence
disease progression or severity in children.

At doses of 400 mcg/day or lower, adverse effects are rare. Although ICSs may inhibit
linear growth in children, such inhibition hasn’t been reported with daily doses of 100 to
200 mcg. At 400 mcg/day, reduced growth velocity may occur—but this effect arises early
in the course of therapy and by the end of 1 year, growth velocity usually returns to
normal. Higher doses may cause dermal thinning and suppression of the hypothalamic-
pituitary-adrenal axis. However, ICSs rarely cause adrenal insufficiency.
Systemic corticosteroids. EPR-3 recommends chronic systemic (oral) corticosteroids as
long-term controller medications only for the most severe, hard-to-control asthma,
because of the risk of adverse effects. Alternate-day regimens (a single early-morning
dose every 48 hours) have proven effective and cause substantially fewer adverse effects
than daily dosing. These drugs also play a role in acute asthma.

Cromolyn sodium and nedocromil sodium. These agents stabilize mast cells and impede
chloride channel function. Taken by inhalation, they have modest anti-inflammatory
effects. They’re used as alternative (not preferred) therapy for mild persistent asthma,
and to prevent attacks before exercise or unavoidable allergen exposure. Both drugs
have excellent safety profiles.

Immunomodulators. Omalizumab is a humanized monoclonal anti–immunoglobulin (Ig) E

antibody that binds to IgE on mast cells and basophils. Given monthly by injection, it’s
intended for patients with moderate to severe asthma who don’t respond to other
treatments. The drug reduces exacerbations and the need for rescue medication,
decreases use of emergency departments (EDs) and other resources, and lowers
symptom scores in the few patients who require it.

High cost is a major deterrent to omalizumab use. Also, the drug may cause anaphylaxis.
In clinical trials, it caused bruising and injection-site pain in up to 20% of patients.

Leukotriene modifiers. Cysteinyl leukotrienes derive from cell membrane phospholipids

perturbed by allergic reactions and certain other factors. Potent bronchoconstrictors,
leukotrienes increase microvascular permeability, causing edema. They also increase
mucus secretion and reduce mucus transport.

Leukotriene modifiers include two categories:

 leukotriene-receptor antagonists (LTRAs)—namely, montelukast and zafirlukast

 zileuton, a 5-lipoxygenase inhibitor.

EPR-3 classifies leukotriene modifiers as alternative but not preferred therapy for patients
with mild persistent asthma. LTRAs also can be used as adjunctive therapy along with
ICSs; however, for patients age 12 and older, adding LABAs is preferred to LTRAs.
Patients concerned about taking ICSs also may be LTRA candidates. LTRAs aren’t
recommended as monotherapy; their main indication is as add-on therapy in patients who
continue to have significant asthma despite moderate- to high-dose ICS therapy.

Montelukast is approved for asthma treatment in children as young as age 2; it has an

excellent safety profile. Zafirlukast, approved for asthma treatment in children age 7 and
older, requires twice-daily dosing; drug interactions are a potential problem, as the drug
is metabolized in the liver and inhibits hepatic CYP450 activity.
Zileuton hasn’t been studied in children younger than age 12. It may increase hepatic
enzyme levels, so liver function monitoring is essential during therapy.
LABAs. Inhaled LABAs (such as salmeterol and formoterol) relax airway smooth muscle
by stimulating beta2-receptors, which in turn increases cyclic adenosine monophosphate
and antagonizes bronchoconstriction. LABAs are the preferred adjunctive therapy to
combine with ICSs for long-term symptom control and prevention in patients age 12 and
older who have moderate or
severe persistent asthma.

LABAs provide bronchodilation for at least 12 hours after a single dose; formoterol has a
faster onset than salmeterol. Neither drug provides significant anti-inflammatory effects
and shouldn’t be used as monotherapy for long-term control. EPR-3 doesn’t recommend
them for treating acute symptoms or exacerbations.

Generally, daily doses shouldn’t exceed 100 mcg salmeterol or 24 mcg formoterol. A fixed
salmeterol-fluticasone combination (Advair) may be used when fluticasone alone doesn’t
provide optimal therapeutic effect. Salmeterol and the salmeterol-fluticasone combination
carry a black-box warning about an increased risk of asthma-related death.

Methylxanthines. Theophylline, a bronchodilator that may have mild anti-inflammatory

effects, is no longer widely used to treat asthma. It has a narrow therapeutic index and
may cause many drug interactions. EPR-3 recommends sustained-release theophylline
as alternative (not preferred) therapy for mild persistent asthma or as adjunctive therapy
with ICSs in patients age 5 and older. During therapy, serum theophylline levels must be
measured.

Quick-relief medications

Drugs used to relieve acute asthma symptoms and exacerbations include short-acting
beta2-agonists (SABAs), anticholinergics, and systemic corticosteroids.

SABAs. Inhaled bronchodilators, such as albuterol, levalbuterol, and pirbuterol, relax

smooth muscle. EPR-3 recommends these agents as the preferred therapy to relieve
acute symptoms and prevent exercise-induced bronchoconstriction (EIB).

SABAs are best used as rescue drugs on an as-needed basis. Suspect inadequate
asthma control and the need to begin or step up anti-inflammatory therapy in patients
who need to increase their SABA use or take these drugs more than 2 days weekly to
prevent symptoms (but not to prevent EIB). EPR-3 advises against prolonged regular
daily use.

SABAs cause few adverse cardiovascular effects. Usually, they’re prescribed in a

metered-dose inhaler. Stimulation of skeletal-muscle beta2-receptors can cause an
annoying hand tremor—but this typically disappears over several weeks.
Anticholinergics. These drugs (such as ipratropium bromide) block acetylcholine released
by airway cholinergic receptors and reduce the airway’s intrinsic vagal tone. According to
EPR-3, ipratropium confers added benefits when given in multiple doses along with
SABAs in ED patients with moderate or severe exacerbations. Patients with more severe
airway obstruction seem to benefit the most.

Patients who can’t tolerate SABAs may use ipratropium as an alternative bronchodilator.
The drug has a short duration (6 hours, at most) and isn’t indicated for day-to-day asthma
management. As a class, anticholinergics are safe, although they can cause adverse
effects.

Systemic (oral) corticosteroids. These drugs suppress, control, and reverse airway
inflammation, speeding resolution of airflow obstruction. For asthma therapy, they’re used
almost exclusively as rescue medications in acute asthma (given in conjunction with
SABAs) to speed recovery and prevent recurrence of exacerbations.

A short course, preferably using prednisone or prednisolone, can halt progression of an

acute asthma attack and prevent hospitalization. For an acute exacerbation, oral
prednisone has proven to be superior to high-dose ICSs. If a patient needs multiple
courses of these drugs (especially more than three per year), the clinician should
reevaluate the asthma management plan.

Unlike long-term use, which can cause a host of serious problems, short-term use (less
than 10 days) rarely causes severe effects. The risk of such effects varies with dosage
and duration.

Stepwise approach to drug therapy

EPR-3 recommends a stepwise approach to long-term asthma management, in which

medications are increased (stepped up) as needed and decreased (stepped down), if
possible, to achieve and maintain asthma control. This approach applies to all patients,
although it must be tailored to the needs of individuals or patient groups. Clinicians must
consider the patient’s age because the disease course may change over time. Also, the
relevance of various assessment measures and the potential short- and long-term impact
of drugs may be age-related.

New age-group classifications

Unlike earlier guidelines, EPR-3 presents recommendations for three age-groups:

 children up to age 4
 children ages 5 to 11 (previously combined with adults)
 children age 12 or older and adults.

Be aware that certain EPR-3 recommendations for agents and dosages vary slightly for
each age-group. For details, see the full report (available at
www.nhlbi.nih.gov/guidelines/asthma/). Medication choices and dosages hinge on both
daytime and nighttime symptom frequency, FEV1 or peak expiratory flow (PEF), and
diurnal PEF variation.

New expansion of the stepwise approach

EPR-3 has expanded the stepwise approach from four steps to six to simplify the actions
within each step, and has revised treatment options within the steps. For example, in
children up to age 4 who aren’t well-controlled on low-dose ICSs, EPR-3 recommends
increasing the ICS dosage to medium before adding adjunctive therapy. For the other
age-groups, increasing the ICS dosage to medium or adding adjunctive therapy to a low-
dose ICS are now considered equal options.

New severity classifications

EPR-3 classifies asthma in terms of severity—intermittent to mild persistent, moderate

persistent, and severe persistent. It has eliminated the mild intermittent category.

 Intermittent asthma requires no daily medication. Occasional flare-ups can be

treated symptomatically with a short course of systemic corticosteroids and
albuterol. Mild persistent asthma is best treated with low-dose (400 mcg or less)
ICSs. Alternative treatments include cromolyn, nedocromil, an LTRA, or extended-
release theophylline.
 Moderate persistent asthma calls for stepped-up treatment, such as a low- to
medium-dose ICS combined with a LABA. For some patients, a medium-dose ICS

may be an alternative.

 Severe persistent asthma requires a high-dose ICS, a LABA, and, if needed, oral
corticosteroids (preferably in an alternate-day regimen).

Once asthma is controlled, clinicians should make periodic attempts to step therapy down
by reducing the dosage or dosing frequency. They should consider stepping therapy up
after assessing therapeutic adherence, environmental control, and comorbid conditions.
Based on the same considerations, they should make step-down decisions when asthma
has been well-controlled for at least 3 months.

Managing moderate or severe asthma exacerbations

The main goals of treating asthma exacerbations are to:

 correct significant hypoxemia by administering oxygen

 rapidly reverse airflow obstruction
  decrease the risk of relapse or recurrence of severe airflow obstruction by
intensifying therapy.

Meeting these goals calls for careful assessment and monitoring. Compared to earlier
guidelines, EPR-3 simplifies classification of exacerbation severity. Also, it acknowledges
the limited value of pulmonary function measures in managing very severe exacerbations.
Repeated measurements of lung function can be useful in assessing adults for
exacerbation severity; however, in children, no single assessment tool appears to be best
for evaluating exacerbation severity or monitoring response to treatment.

Therapeutic recommendations

The best way to manage moderate to severe asthma exacerbations is to ensure early
treatment. For ED patients, EPR-3 recommends administering oxygen to relieve
hypoxemia, along with a SABA (plus inhaled ipratropium for severe exacerbations) and
systemic corticosteroids if the patient doesn’t respond completely to the SABA. Clinicians
should monitor response to therapy with serial lung function measurements. For
exacerbations, EPR-3 has added levalbuterol as SABA therapy.

Teaching patients how to manage exacerbations at home

EPR-3 recommends that patients start treatment at home to avoid treatment delays and
prevent exacerbations from getting severe. To prepare patients for home management,
clinicians should:

 teach patients how to monitor symptoms so they can promptly recognize

deterioration (such as inability to speak, use of accessory chest muscles, and PEF
of 40% or less of personal best)
 consider teaching selected patients how to monitor lung function
 give patients a written asthma action plan and encourage them to follow it
 urge patients with moderate or severe persistent asthma or a history of severe
exacerbations to keep required medication and equipment at home to treat
exacerbations.

Promoting a full, active life despite asthma

EPR-3 reflects the latest scientific evidence on asthma. Using it as a resource in your
nursing practice can help you ensure that patients benefit from the best available data
and achieve the ultimate goal of therapy—controlling asthma to help them lead full, active
lives.