Asthma management: How the guidelines compare

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doi:doi: 10.12788/jfp.0501

Applied Evidence

Asthma management: How the guidelines compare

J Fam Pract. 2022 November;71(9):392-397 | doi: 10.12788/jfp.0501

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References

1. CDC. Most recent national asthma data. Accessed October 24, 2022. www.cdc.gov/asthma/most_recent_national_asthma_data.htm

2. Akinbami LJ, Santo L, Williams S, et al. Characteristics of asthma visits to physician offices in the United States: 2012–2015 National Ambulatory Medical Care Survey. Natl Health Stat Report. 2019;128:1-20.

3. NHLBI. National Asthma Education and Prevention Program expert panel report 3: guidelines for the diagnosis and management of asthma. NIH Publication 07-4051. 2007. Accessed October 24, 2022. www.nhlbi.nih.gov/sites/default/files/media/docs/EPR-3_Asthma_Full_Report_2007.pdf

4. Global Initiative for Asthma (GINA). Global strategy for asthma management and prevention. 2022. Accessed October 24, 2022. https://ginasthma.org/wp-content/uploads/2022/07/GINA-Main-Report-2022-FINAL-22-07-01-WMS.pdf

5. NHLBI. 2020 Focused updates to the asthma management guidelines. Accessed October 24, 2022. www.nhlbi.nih.gov/health-topics/all-publications-and-resources/2020-focused-updates-asthma-management-guidelines

6. Lazarus SC, Krishnan JA, King TS, et al. Mometasone or tiotropium in mild asthma with a low sputum eosinophil level. N Engl J Med. 2019;380:2009-2019. doi: 10.1056/NEJMoa1814917

7. Suissa S, Ernst P, Benayoun S, et al. Low-dose inhaled corticosteroids and the prevention of death from asthma. N Engl J Med. 2000;343:332-336. doi: 10.1056/NEJM200008033430504

8. Suissa S, Ernst P, Kezouh A. Regular use of inhaled corticosteroids and the long term prevention of hospitalisation for asthma. Thorax. 2002;57:880-884. doi: 10.1136/thorax.57.10.880

9. Szefler SJ, Mitchell H, Sorkness CA, et al. Management of asthma based on exhaled nitric oxide in addition to guideline-based treatment for inner-city adolescents and young adults: a randomised controlled trial. Lancet. 2008;372:1065-1072. doi: 10.1016/S0140-6736(08)61448-8

10. Calhoun WJ, Ameredes BT, King TS, et al. Comparison of physician-, biomarker-, and symptom-based strategies for adjustment of inhaled corticosteroid therapy in adults with asthma: the BASALT randomized controlled trial. JAMA. 2012;308:987-997. doi: 10.1001/2012.jama.10893

11. Garg Y, Kakria N, Katoch CDS, et al. Exhaled nitric oxide as a guiding tool for bronchial asthma: a randomised controlled trial. Med J Armed Forces India. 2020;76:17-22. doi: 10.1016/j.mjafi.2018.02.001

12. Honkoop PJ, Loijmans RJ, Termeer EH, et al. Symptom- and fraction of exhaled nitric oxide-driven strategies for asthma control: a cluster-randomized trial in primary care. J Allergy Clin Immunol. 2015;135:682-8.e11. doi: 10.1016/j.jaci.2014.07.016

13. Peirsman EJ, Carvelli TJ, Hage PY, et al. Exhaled nitric oxide in childhood allergic asthma management: a randomised controlled trial. Pediatr Pulmonol. 2014;49:624-631. doi: 10.1002/ppul.22873

14. Powell H, Murphy VE, Taylor DR, et al. Management of asthma in pregnancy guided by measurement of fraction of exhaled nitric oxide: a double-blind, randomised controlled trial. Lancet. 2011;378:983-990. doi: 10.1016/S0140-6736(11)60971-9

15. Shaw DE, Berry MA, Thomas M, et al. The use of exhaled nitric oxide to guide asthma management: a randomized controlled trial. Am J Respir Crit Care Med. 2007;176:231-237. doi: 10.1164/rccm.200610-1427OC

16. Stam J, Souren M, Zweers P. The onset of action of formoterol, a new beta 2 adrenoceptor agonist. Int J Clin Pharmacol Ther Toxicol. 1993;31:23-26.

17. Evgenov OV, Liang Y, Jiang Y, et al. Pulmonary pharmacology and inhaled anesthetics. In: Gropper MA, Miller RD, Evgenov O, et al, eds. Miller’s Anesthesia. 8th ed. Elsevier; 2020:540-571.

18. Rodrigo GJ, Neffen H. Efficacy and safety of tiotropium in school-age children with moderate-to-severe symptomatic asthma: a systematic review. Pediatr Allergy Immunol. 2017;28:573-578. doi: 10.1111/pai.12759

19. Global Initiative for Asthma (GINA). Asthma, COPD, and asthma-COPD overlap syndrome (ACOS). 2015. Accessed October 24, 2022. https://goldcopd.org/wp-content/uploads/2016/04/GOLD_ACOS_2015.pdf

The airflow limitation in asthma occurs through both airway hyperresponsiveness to external stimuli and chronic airway inflammation. Airway constriction is regulated by nerves to the smooth muscles of the airway. Beta-2 nerve receptors have long been the target of asthma therapy with both short-acting beta-2 agonists (SABAs) as rescue treatment and long-acting beta-2 agonists (LABAs) as maintenance therapy.^3,4 However, there is increasing evidence that cholinergic nerves also have a role in airway regulation in asthma, and long-acting muscarinic antagonists (LAMAs) have recently shown benefit as add-on therapy in some types of asthma.^4-6 Inhaled corticosteroids (ICSs) have long held an important role in reducing airway inflammation, especially in the setting of allergic or eosinophilic inflammation.^3-5

Spirometry is essential to asthma Dx—but what about FeNO?

The mainstay of asthma diagnosis is confirming both a history of variable respiratory symptoms and variable expiratory airflow limitation exhibited by spirometry. Obstruction is defined as a reduced forced expiratory volume in 1 second (FEV₁) and as a decreased ratio of FEV₁ over forced vital capacity (FVC) based on predicted values. An increase of at least 12% in FEV₁ post bronchodilator use indicates asthma for adolescents and adults.

A fractional exhaled nitric oxide level > 50 ppb makes eosinophilic inflammation and treatment response to an inhaled corticosteroid more likely.

More recently, studies have examined the role of fractional exhaled nitric oxide (FeNO) in the diagnosis of asthma. The 2020 Focused Updates report states that FeNO may be useful when the diagnosis of asthma is uncertain using initial history, physical exam, and spirometry findings, or when spirometry cannot be performed reliably.⁵ Levels of FeNO > 50 ppb make eosinophilic inflammation and treatment response to an ICS more likely. FeNO levels < 25 ppb make inflammatory asthma less likely and should prompt a search for an alternate diagnosis.⁵ For patients with FeNO of 25 to 50 ppb, more detailed clinical context is needed. In contrast, the 2022 GINA updates conclude that FeNO is not yet an established diagnostic tool for asthma.⁴

Management

When to start and adjust an ICS

ICSs continue to be the primary controller treatment for patients with asthma. However, the NAEPP and GINA have provided different guidance on how to initiate step therapy (TABLE^3-5). NAEPP focuses on severity classification, while GINA recommends treatment initiation based on presenting symptoms. Since both guidelines recommend early follow-up and adjustment of therapy according to level of control, this difference becomes less apparent in ongoing care.

A more fundamental difference is seen in the recommended therapies for each step (TABLE^3-5). Whereas the 2020 Focused Updates prefers a SABA as needed in step 1, GINA favors a low-dose combination of ICS-formoterol as needed. The GINA recommendation is driven by supportive evidence for early initiation of low-dose ICS in any patient with asthma for greater improvement in lung function. This also addresses concerns that overuse of as-needed SABAs may increase the risk for severe exacerbations. Evidence also indicates that the risk for asthma-related death and urgent asthma-related health care increases when a patient takes a SABA as needed as monotherapy compared with ICS therapy, even with good symptom control.^7,8

Continue to: Dosing of an ICS