Supplements Improving Asthma Care: An Update for Managed Care [CME/CPE]
Managed Care Opportunities for Improving Asthma Care
Uncontrolled asthma is an enormous burden in terms of the propensity to reach asthma control in the future, direct and indirect costs, and health-related quality of life. The complex pathophysiology, treatment, and triggers of asthma warrant a unified, yet targeted, approach to care. No single factor is fully responsible for poor control. Complicating the problem of asthma control is adherence to long-term controller medications. The National Asthma Education and Prevention Program (NAEPP) established several key points for asthma control, and developed classifications for asthma control and recommended actions for treatment. All parties involved in the management of asthma, including physicians, pharmacists, nurses, patients, family members, and insurance companies, need to be aware of the NAEPP guidelines. To determine if the goals of asthma therapy are being met, assessment of asthma outcomes is necessary. Unfortunately, some measures may get overlooked, and patient-reported outcomes (as assessed by the validated control instruments) are not often collected during routine examinations. The Healthcare Effectiveness Data and Information Set measure for asthma may be used to quantify asthma care, but there is evidence that it does not fully capture the goals of asthma management. Most well-designed, education-based interventions are considered good value for money, but it can be difficult to put into practice such policy interventions. An optimal managed care plan will adhere to known evidence-based guidelines, can measure outcomes, is targeted to the patient’s risk and impairment, and can adapt to changes in our understanding of asthma and its treatment.
(Am J Manag Care. 2011;17:S90-S96)
The National Asthma Education and Prevention Program (NAEPP) established several key points for asthma control (Table 1).1 They have also established classifications for asthma control and recommended actions for treatment (Table 2).1 All parties involved in the management of asthma, including physicians, pharmacists, nurses, patients, family members, and insurance companies, need to be aware of these key points.
The complex pathophysiology, treatment, and triggers of asthma further warrant a unified, yet targeted, approach to care. Obtaining and maintaining good asthma control is difficult because of these complexities, and no single factor is fully responsible for poor control. For example, Schatz et al noted that several factors independently influenced poor asthma control (eg, lower income, comorbidities, asthma severity) while other factors did not (regular inhaled steroid use, a written asthma management plan, and regular specialty care).2 In another study, Bahadori et al noted that the large variation in asthma control can be partly explained by variations in guideline adherence to medication use and deficits in patients’ management.3
Whatever factors play a role in poor asthma control, it is clear that uncontrolled asthma is an enormous burden in terms of the propensity to reach asthma control in the future, direct and indirect costs, and health-related quality of life.4,5
Complicating the problem of asthma control is adherence to long-term controller (LTC) medication treatment. It is well known that asthma is associated with poor LTC treatment adherence, and this is linked with suboptimal asthma control.6 Therefore, a key to asthma management is improved treatment adherence. Poor compliance, however, is not limited to a patient forgetting their inhaler. As noted in the first article of this supplement,7 poor adherence to treatment can include: missing follow-up appointments, not removing known allergy trigger factors, neglecting to record symptoms, not having regular reviews, clinicians not following guidelines, insurance companies not providing or reimbursing for time to educate patients, and families not providing the needed support. All of these factors also impact asthma control.
The purpose of this article is to examine some of the ways that asthma care can be quantified and explain how managed care programs can improve asthma control.
Measuring Improvements in Asthma Care
To determine if the goals of asthma therapy are being met, assessment of asthma outcomes is necessary. The NAEPP guidelines state that periodic monitoring of asthma control should include (at a minimum): (1) signs and symptoms of asthma; (2) pulmonary function; (3) quality of life/functional status; (4) history of asthma exacerbations; (5) pharmacotherapy (checking for adherence to therapy and potential side effects from medication); and (6) patient-provider communication and patient satisfaction.1 In terms of asthma control, the NAEPP guidelines categorize patients into levels of impairment and levels of risk, and classify patients’ asthma control level based on the most severe impairment or risk component (Table 2). The guidelines are flexible on how impairment is assessed because individual components of impairment can be measured directly or alternatively, using 1 of 3 validated control instruments: Asthma Control Questionnaire, Asthma Control Test, or the Asthma Therapy Assessment Questionnaire.
Unfortunately, some of these measures may get overlooked, and patient-reported outcomes (as assessed by the validated control instruments) are not often collected during routine examinations. Clinicians may instinctively focus on the patient’s asthma symptoms and downplay other measures. Outcomes, however, such as those related to quality-of-life measures, are important. Generic instruments, such as the Short Form (36) Health Survey,8 and asthma-specific measures, such as the Asthma Quality of Life Questionnaire,9 have been used in the adult asthma population. Important components of the assessment of adult asthma-related quality of life should include missed work days, reductions in activities, and disturbances in sleep. In addition to quality-of-life metrics, patient satisfaction with asthma care and management is positively correlated to treatment adherence.10 It is advised that patient perception of asthma control and quality of care be evaluated.
The Healthcare Effectiveness Data and Information Set
(HEDIS) measure for asthma (ie, appropriate controller medication prescription for patients with persistent asthma) may also be used to quantify asthma care, but recent studies have criticized its value. Lim et al conducted a mail survey of adults with asthma and combined it with an evaluation of 12-month medical and pharmacy claims.11 Asthma control was the most useful patient outcome quality indicator and compliance with the HEDIS asthma measure was not associated with a better patient-oriented outcome. Although this study has limitations, it provides evidence that the HEDIS measure for asthma does not fully capture the goals of asthma management.
HEDIS definitions may help us categorize patients. A retrospective cohort study examined medical records of 8634 patients with HEDIS-defined persistent asthma and determined that one method to predict emergency visits was the number of canisters of short-acting beta agonists (SABAs) dispensed.12
In summary, there are numerous methods available to measure outcomes in asthma. No one measure appears fully comprehensive in predicting asthma care. The NAEPP guidelines suggest directly measuring all components of asthma control or measuring the impairment component using 1 of the 3 validated control instruments. In lieu of this, the HEDIS asthma measure may provide some information in categorizing patients into risk and impairment groups.
The Economics of Improving Asthma Care
Numerous studies have attempted to evaluate the clinical and economic aspects of various asthma interventions and policies. The results of these studies are mixed, and drawing conclusions is difficult given the lack of consistency defining asthma control.13 With that caveat, the cost-effectiveness of inhaled corticosteroid (ICS) therapy is widely accepted for those in whom treatment with an ICS is appropriate. Further, the published literature indicates that the combination of an ICS plus a long-acting beta agonist (LABA) offers favorable value for money.14-16 However, a comparative effectiveness research study of a high-dose ICS plus a LABA suggested limited clinical benefit.17 In this latter study, low-dose ICS therapy plus a LABA (100 or 250 μg fluticasone plus 50 μg salmeterol) and high-dose ICS therapy plus a LABA (500 μg fluticasone plus 50 μg salmeterol) was compared with the next best alternative treatment. Patients receiving the lower dose had better asthma control, while patients given the higher dose did not fare much better than patients in a control group who received other medications.
One alternative to high-dose ICS therapy plus a LABA that may provide clinical and economic value is omalizumab. The National Institute for Health and Clinical Excellence in the United Kingdom recently published a health technology assessment of omalizumab, and suggested that omalizumab may be cost-effective for patients with certain characteristics including severe, unstable allergic asthma and past severe asthma exacerbations.18 Although evidence in the literature on the cost-effectiveness of omalizumab is inconclusive, it may be good value for money in responders with severe, but uncontrolled, allergic disease.19,20
The full extent to which poor treatment adherence impacts overall asthma burden and costs has yet to be determined. Navaratnam et al looked at claims for patients withmild asthma for 1 year and categorized them as being high control/high adherence patients (no exacerbations/>60% days of recorded ICS use; n = 483) or low control/low adherence patients (exacerbations reported/<60 days of recorded ICS use; n = 258).6 Compared with the low control/low adherence group, the high control/high adherence group had fewer asthma treatment days (3.9 vs 2.9, respectively; P<.0001) and lower overall asthma charges ($3345 vs $2655, respectively; P <.0001) in the post-index period. The high control/high adherence group had higher pharmaceutical-related charges, but overall charges were smaller due to the reduced need for inpatient and outpatient care (Figure).6
Disease Management Programs and Improving Asthma Care
Most well-designed, education-based interventions are considered good value for money by their authors, but it can be difficult to put into practice such policy interventions. To illustrate how they can impact asthma control, below are a few recent studies worth noting.
Zeiger et al examined whether following the NAEPP-recommended step-up treatment program in a managed care program would be effective.21 The records of 7694 patients with uncontrolled asthma were reviewed to determine if they were placed in a step-up program. Among 7177 patients who could be classified, 2160 patients (30.1%) were subsequently enrolled in a step-up program (5017 patients did not receive step-up care). Using a Poisson regression analysis, the authors determined that patients in the step-up program had a significant reduction in impairment (ie, fewer SABA canisters needed) over the course of a year compared with those patients who were not in a step-up program (adjusted RR, 0.84; 95% CI, 0.78-0.90). Analysis of risk over the course of the year (ie, number of emergency department/hospital visits) was not different among the 2 groups. Limitations of this study included nonrandom allocation of what the authors describe as the step-up program. Also, patients in the step-up program had more mild disease at baseline compared with those in the control group. Measurable or immeasurable differences between groups may have affected their ability to detect a difference in risk.
In the randomized, double-blind, GOAL (Gaining Optimal Asthma ControL) study by Bateman et al, step-up treatment with ICS/LABA therapy achieved guideline-derived asthma control in a majority of patients.22 The GOAL trial step-up intervention was also found to be cost-effective.23 The question remains as to how managed care organizations could replicate the GOAL trial intervention or others at the patient level, and whether or not similar effectiveness and cost-effectiveness would be observed in the real world.