Asthma


Article Author:
William Gossman
Maryam Tariq


Article Editor:
Mary Cataletto


Editors In Chief:
Casey Ciresi


Managing Editors:
Avais Raja
Orawan Chaigasame
Khalid Alsayouri
Kyle Blair
Radia Jamil
Erin Hughes
Patrick Le
Anoosh Zafar Gondal
Saad Nazir
William Gossman
Hassam Zulfiqar
Navid Mahabadi
Hussain Sajjad
Steve Bhimji
Muhammad Hashmi
John Shell
Matthew Varacallo
Heba Mahdy
Ahmad Malik
Abbey Smiley
Sarosh Vaqar
Mark Pellegrini
James Hughes
Beenish Sohail
Hajira Basit
Phillip Hynes
Sandeep Sekhon


Updated:
8/22/2019 9:23:48 PM

Introduction

Asthma is a common disease and has a range of severity, from a very mild, occasional wheeze to an acute, life-threatening airway closure. It usually presents in childhood and is associated with other features of atopy, such as eczema and hayfever.[1][2][3]

Asthma is a very common childhood illness leading to multiple hospital admissions and increased healthcare costs. The key feature is the airway hyper-responsiveness which can be triggered by many factors. If not treated promptly, asthma has high mortality.

Etiology

Asthma comprises a range of diseases and has a variety of heterogeneous phenotypes. The recognized factors that are associated with asthma are a genetic predisposition, specifically a personal or family history of atopy (propensity to allergy, usually seen as eczema, hay fever, and asthma).[4][5]

Asthma also is associated with exposure to tobacco smoke and other inflammatory gases or particulate matter.

The overall etiology is complex and still not fully understood, especially when it comes to being able to say which children with pediatric asthma will carry on to have asthma as adults (up to 40% of children have a wheeze, only 1% of adults have asthma), but it is agreed that it is a multifactorial pathology, influenced by both genetics and environmental exposure.

Triggers for asthma include:

  • Viral infections
  • Exercise
  • GERD
  • Chronic sinusitis
  • Environmental allergens
  • Use of aspirin, beta blockers
  • Tobacco smoke
  • Insects, plants, chemical fumes

Epidemiology

Asthma is a common pathology, affecting around 15% to 20% of people in developed countries and around 2% to 4% in less developed countries. It is significantly more common in children. Up to 40% of children will have a wheeze at some point, which, if reversible by beta-2 agonists, is termed asthma, regardless of lung function tests. Asthma is associated with exposure to tobacco smoke and inhaled particulates and is thus more common in groups with these environmental exposures.[6][7]

Pathophysiology

Asthma is a condition of acute, fully reversible airway inflammation, often following exposure to an environmental trigger. The pathological process begins with the inhalation of an irritant (e.g., cold air) or an allergen (e.g., pollen), which then, due to bronchial hypersensitivity, leads to airway inflammation and an increase in mucus production. This leads to a significant increase in airway resistance, which is most pronounced on expiration.

If not corrected rapidly, asthma may become more difficult to treat, as the mucus production prevents the inhaled medication from reaching the mucosa. The inflammation also becomes more edematous. This process is resolved (in theory complete resolution is required in asthma, but in practice this is not checked or tested) with beta-2 agonists (e.g., salbutamol, salmeterol, albuterol) and can be aided by muscarinic receptor antagonists (e.g., ipratropium bromide), which act to reduce the inflammation and relax the bronchial musculature, as well as reducing mucus production.[8]

Toxicokinetics

The only relevant toxicokinetics in asthma relate to its management as the absorption and systemic side effects of the beta-2 agonists must be monitored. Typically these will be removed from the body in 2 to 4 hours if salbutamol and albuterol, 18 to 24 hours if salmeterol, or 48 to 72 hours if clenbuterol, which is no longer used in the management of asthma.

The side effects of the beta-2 agonists include tachycardia, flushing, sweating, and other signs of sympathetic system overdrive. There is also the chance of iatrogenic hypokalaemia, which must be monitored.

History and Physical

Patients will usually give a history of a wheeze or a cough, exacerbated by allergies, exercise, and cold. There is often diurnal variation, with symptoms being worse at night. Patients may give a history of other forms of atopy, such as eczema and hay fever. There may be some mild chest pain associated with acute exacerbations. Many asthmatics have nocturnal coughing spells but appear normal in the day time

Physical exam findings will depend on whether the patient is currently experiencing an acute exacerbation.

During an acute exacerbation, there may be a fine tremor in the hands due to salbutamol use, and mild tachycardia. Patients will show some respiratory distress, often sitting forwards to splint open their airways. On auscultation, a bilateral, expiratory wheeze will be heard. In life-threatening asthma, the chest may be silent, as air cannot enter or leave the lungs, and there may be signs of systemic hypoxia.

Children with imminent arrest may appear drowsy, unresponsive, cyanotic and confused. Wheezing may be absent and bradycardia may occur, indicating severe respiratory muscle fatigue.

Evaluation

Bedside

Pulse oximetry can be useful in assessing the severity of an asthma attack or monitoring for deterioration. Note that pulse oximetry lag, and the physiological reserve of many patients means that a falling pO2 on pulse oximetry is a late finding, indicating a severely unwell or peri-arrest patient.

Peak flow measures also can be used to assess asthma and should always be checked against a nomogram as well as the individual patient's normal baseline function. The different severities of acute asthma attacks have an associated peak flow measurement, recorded as a certain percentage of expected peak flow.

Laboratory

Urea and electrolytes (kidney function) should be taken if the patient has a high dose or repeat salbutamol, as one of the side effects of salbutamol is to cause potassium to shift into the intracellular space transiently, which can induce a transient, iatrogenic hypokalaemia. Eosinophilia is common but is not specific for asthma. Recent studies show that levels of sputum eosinophils may guide therapy. In addition, some patients may have an elevation of serum IgE.

The arterial blood gas may reveal hypoxemia and respiratory acidosis. Studies indicate that periostin may be a marker for asthma but its clinical role remains unsettled.

An ECG will reveal sinus tachycardia; which may be due to asthma, albuterol or theophylline.

Imaging

A chest x-ray is an important test, especially if patients have a history of risk of the potential foreign body or possible infection. Chest CT scan is done in patients with recurrent symptoms who do not respond to therapy.

Special Tests

Spirometry is the diagnostic method of choice and will show an obstructive pattern that is partially or completely resolved by salbutamol. Spirometry should be done before treatment to determine the severity of the disorder A reduced ratio of FEV1 to FVS is indicative of airway obstruction, which is reversible with treatment. Peak expiratory flow measurement is common today and allows one to document response to therapy. A limitation of this test is that it is effort dependent.

In some patients, a methacholine/histamine challenge may be required to determine if airway hyper-reactivity is present. This test should only be done by trained individuals.

Exercise spirometry may help identify patients with exercise-induced bronchoconstriction.

Treatment / Management

Conservative Measures

Measures to take include calming the patient to get them to relax, moving outside or away from the likely source of allergen, and cooling the person. Removing clothing and washing the face and mouth to remove allergens is sometimes done, but it is not evidence-based.[9][10][11]

Environmental control is vital if one wants to avoid recurrent attacks. Allergen avoidance can significantly improve the quality of life. This means avoiding tobacco, dust mites, animals and pollen.

Allergen immunotherapy remains controversial. Large studies have not shown any significant benefit and the technique is prohibitively expensive.

Monoclonal antibody therapy is indicated for patients with moderate to severe asthma who have a positive skin test. The treatment can lower IgE levels, which in turn decreases histamine production. However, the cost of the injections is high.

Bronchial thermoplasty is a relatively new technique that delivers thermal energy to the airway wall and reduces the narrowing of the airways. Several studies show that it can reduce emergency visits and days missed from school.

Medical

Medical management includes bronchodilators like beta-2 agonists and muscarinic antagonists (salbutamol and ipratropium bromide respectively) and anti-inflammatories such as inhaled steroids (usually beclometasone but steroids via any route will be helpful).

Indications for admission

If a patient has received 3 doses of an inhaled bronchodilator and shows no response, the following factors should be used to determine admission:

  • The severity of airflow obstruction
  • Duration of asthma
  • Response to medications
  • Adequacy of home support
  • Any mental illness

Surgical

There is no surgical input into the management of typical asthma.

Other/Long Term

Weight loss, smoking cessation, occupational change, and self-monitoring are all important in preventing disease progression and reducing the number of acute attacks.

Differential Diagnosis

The main differential for an acute, life-threatening asthma attack is an anaphylactic reaction. In this case, the patient may also present with orofacial swelling, a rash, and itching. The patient will partially respond to salbutamol and steroids, but intramuscular adrenaline is the lifesaving medication needed to manage these patients.

Staging

The severity of asthma is usually classified as follows:

  • Intermittent
  • Mild persistent
  • Moderate persistent
  • Severe persistent

Prognosis

Asthma is not a benign illness and accounts for 1 death per 100,000 people in some countries. The mortality is related to lung function and is exacerbated by smoking. Asthma leads to loss of time from work and school; it also leads to multiple hospital admissions increasing the cost of healthcare. Poorly controlled asthma can be disabling and leads to a poor quality of life.

Postoperative and Rehabilitation Care

Patients with asthma need life-long follow up for monitoring of the disease, quality of life and functional status. At each visit, compliance with medications should be emphasized.

Asthma is not a curable disorder and patients need life long monitoring. Patients should be educated about the need for monitoring of the disease and compliance with medications.

Deterrence and Patient Education

Patient education about the disease and modifying behavior is vital. The patient should also be encouraged to change lifestyle and control the environmental trigger factors.

Patients should be asked to maintain a healthy body weight as evidence reveals that the disorder is more difficult to control in overweight individuals.

Patients should avoid tobacco and use of beta blockers, aspirin, and sulfites.

Pearls and Other Issues

Disposition

If the patient requires nebulized salbutamol and is not ordinarily on home nebulizers, he or she should be admitted. Anyone who has presented with severe or life-threatening asthma should usually be monitored to ensure that the disease does not return when the medication has worn off.

Pitfalls

Issues include forgetting to remove the nebulizer mask once the nebulizer is done (thus leaving the patient on only 6L of 02/min, rather than changing them to 15 L/min via a non-rebreather mask), not assessing inhaler technique, and neglecting to stress the importance of maintenance therapy with inhaled steroids even when the patient is well.

Enhancing Healthcare Team Outcomes

In many countries, including the US, asthma kills one out of every 100,000 persons. The worse the lung function, the higher the mortality. In addition, mortality has also been linked to poor management and lack of medication compliance, especially in young people. Other factors that increase the risk of death include smoking and use of illicit drugs.

Asthma also results in millions of school and workdays lost. In the US alone, close to 2 million asthmatics seek regular care in the emergency department, which also increases the costs of healthcare.

Even though asthma is a reversible disorder, poor lifestyle and lack of management can lead to airway remodeling that leads to chronic symptoms, which are disabling.[12]

The disorder has no cure and thus life long monitoring is necessary. For best outcomes, an interprofessional approach is recommended.

Evidence-based Medicine

Many guidelines have been published for the diagnosis and management of asthma, but the most critical feature is patient education. The nurses are the last professionals to see the patient before discharge from the emergency department or the floors. Similarly, since most asthmatics are treated as outpatients, pharmacists encounter them regularly. Evidence shows that teaching patients about this disorder and the importance of compliance are critical for good outcomes. The patient should be taught about monitoring technique, inhaler use, and modifying the environment. A social worker should be involved in the care to ensure that the patient has adequate home support and facilities.

Many evidence-based asthma plans are available for the management of asthma and should be handed out to patients. Finally, nurses also play a vital role in school-based asthma education programs that can help improve self-esteem, knowledge, and self-management behaviors.[13][14][15] (Level II)

Management of asthma requires an interdisciplinary approach. Nurses work with the clinician in providing patient and family education regarding avoiding triggers, regular use of medications, and being prepared with rescue inhalers. The pharmacist should assist with appropriate use of inhalers and encouraging daily medication administration. The pharmacist should carefully examine the current medications and make sure the patient is not taking any medications that may trigger an attack, working with the prescriber to modify the treatment. An interdisciplinary approach will result in the best outcomes. [Level V]

Outcomes

Despite great awareness of the disease, asthma still results in high morbidity and even mortality. There are universal guidelines on managing the disorder, but patient compliance with medications remains a big problem. Hence, all healthcare workers have a responsibility in encouraging medication compliance and close follow up with the primary care physician.[16][17](Level V)


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Asthma - Questions

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A decrease in the forced expiratory volume in one second (FEV1) to forced vital capacity (FVC) ratio is most likely to be seen in a patient with which of the following?



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Which of the following is the cardinal physiologic hallmark of asthma?



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In asthma which of the following is said to be chiefly responsible for the airway inflammation?



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What is the drug of choice for patients with asthma who have a continual need for beta agonists?



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Which of the following is an indication of a severe asthma attack?



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In a patient with an acute asthmatic attack, which of the following would least likely be present upon a physical exam?



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Which of the following tests can be used to make a diagnosis of asthma?



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For an individual who has breakthrough asthma attacks once a week, what is the best treatment?



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What is the most important, initial instruction to provide a parent of a child with asthma?



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During an asthmatic attack, one is most likely to see a narrowing of which of the following?



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Which of the following is most appropriate for a patient with asthma exacerbation?



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Which of the following medications is primarily used to manage airway reactivity- induced asthma in singers?



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A patient with dyspnea is seen in the ER. Examination of the sputum reveals the presence of creola bodies. Which diagnosis is likely?



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Which of the following findings is consistent with a diagnosis of asthma?



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What is the drug of choice for the treatment of acute asthma?



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Asthmatic reactions most likely occur when a person is exposed to which animal species?



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A 17-year-old patient's history and presentation is suggestive of asthma. Which of the following diagnostic tools can be used to confirm asthma?



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A patient with asthma presents with symptoms requiring multiple albuterol doses throughout the day. Pulmonary function tests reveal an FEV1 of 50 percent of predicted. How would this patient's level of asthma control be classified?



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A patient with mild, persistent asthma has been well controlled with low-dose inhaled corticosteroids. He presents for follow up complaining of some limitation with normal activities and needing albuterol for symptom relief 3 to 4 days per week over the past month. Which of the following is the preferred next step?



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A patient reports that he is using a high dose inhaled steroid along with a short acting beta-agonist for asthma, but continues to experience shortness of breath and wheezing. Which of the following should be added to this patient's treatment regimen?



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Which of the following causes NSAID-induced asthma?



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In patients with asthma, wheezing is characterized by which of the following?



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Which of the following is a worrisome finding in a patient with an asthma exacerbation?



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Which of the following spirometry measurements are expected to decrease with asthma?



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If a patient with asthma fails to respond to inhaled bronchodilators what is the next step?



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Which obstructive lung disorder in adults is characterized by bronchospasm, excessive bronchial secretions, and bronchial swelling?



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A patient has daily symptoms of asthma and needs to use a short-acting beta-2 agonist inhaler daily. Now he has been experiencing twice weekly exacerbations once during the day and once during the night. How is the patient classified?



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A patient with asthma presents with agitation and significant bilateral wheezing. His oxygen saturation is 88% on room air after administration of a beta agonist. What is the appropriate action?



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Status asthmaticus in patients with intrinsic asthma may be precipitated by which of the following?



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Which of the following findings on complete blood count is most likely in a patient with allergic asthma?



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Which medication should be avoided when treating a patient with asthma who presents with hypertension?



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A 17-year old states that he has been experiencing asthma symptoms daily, with exacerbations three times a week, and nocturnal symptoms more than 7 times per month. What does he need besides a short acting bronchodilator?



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A patient experiences dyspnea, wheezing, and chest tightness while exercising about twice a week. Which of the following medications is appropriate for this patient?



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Which test is most useful in a 17-year-old patient with asthma who is experiencing an uncomplicated exacerbation?



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Which of the following is the most appropriate initial management of mild asthmatic attack?



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Which of the following symptoms does not go along with the diagnosis of moderate persistent asthma?



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Which of the following is unlikely in a patient with severe persistent asthma?



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Which of the following is the most common cause of an asthma exacerbation?



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What percentage of asthma cases are caused by exposure to workplace chemicals?



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Which of the following is one of the three components of asthma diagnosis?



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What is the preferred treatment for individuals with mild persistent asthma?



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Which of the following occurs initially secondary to an uncontrolled asthma exacerbation?



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At what point should hospitalization for an acute asthma exacerbation occur if there is no significant improvement?



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How is an individual with asthma classified with a peak expiratory flow of less than 60% of predicted on more than one occasion?



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Which description of asthma is the most accurate?



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Which of the following is true about severe persistent asthma?



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Which of the following spirometric findings is most consistent with asthma?



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An 8-year-old patient with asthma is brought in for follow-up. He needs to use albuterol daily and awakens secondary to a cough three times a week. Which of the following would be most appropriate?



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Which of the following is the best initial medication in the treatment of mild persistent asthma?



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A 17 year old male presents with acute onset wheezing and shortness of breath. He has had several admissions in the past, including one intensive care unit admission requiring intubation and ventilation 4 years ago. He is normally controlled on daily inhaled steroids and as needed inhaled beta-2 agonists at home. He is normally athletic, and has not suffered an acute attack for the last nine months. What in this patient's history would imply a poor prognosis?



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Which of the following is not associate with intrinsic bronchial asthma?



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Which of the following is the characteristic physical finding of bronchial asthma?



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Many patients with asthma experience bronchospasm when administered aspirin, and are deemed to be aspirin sensitive or even sufferers of "aspirin-induced asthma." What mechanism accounts for the provocative respiratory action of aspirin in these patients?



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A nurse is educating a client on care related to an asthma diagnosis. What are essential aspects of care to include in the teaching session? Select all that apply.



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Asthma - References

References

Lee J,McDonald C, Review: Immunotherapy improves some symptoms and reduces long-term medication use in mild to moderate asthma. Annals of internal medicine. 2018 Aug 21     [PubMed]
Tesfaye ZT,Gebreselase NT,Horsa BA, Appropriateness of chronic asthma management and medication adherence in patients visiting ambulatory clinic of Gondar University Hospital: a cross-sectional study. The World Allergy Organization journal. 2018     [PubMed]
Salo PM,Cohn RD,Zeldin DC, Bedroom Allergen Exposure Beyond House Dust Mites. Current allergy and asthma reports. 2018 Aug 20     [PubMed]
Piloni D,Tirelli C,Domenica RD,Conio V,Grosso A,Ronzoni V,Antonacci F,Totaro P,Corsico AG, Asthma-like symptoms: is it always a pulmonary issue? Multidisciplinary respiratory medicine. 2018     [PubMed]
Aggarwal B,Mulgirigama A,Berend N, Exercise-induced bronchoconstriction: prevalence, pathophysiology, patient impact, diagnosis and management. NPJ primary care respiratory medicine. 2018 Aug 14     [PubMed]
Yii AC,Soh AZ,Chee CBE,Wang YT,Yuan JM,Koh WP, Asthma, sinonasal disease, and the risk of active tuberculosis. The journal of allergy and clinical immunology. In practice. 2018 Aug 18     [PubMed]
D'Amato M,Molino A,Calabrese G,Cecchi L,Annesi-Maesano I,D'Amato G, The impact of cold on the respiratory tract and its consequences to respiratory health. Clinical and translational allergy. 2018     [PubMed]
Southworth T,Kaur M,Hodgson L,Facchinetti F,Villetti G,Civelli M,Singh D, Anti-inflammatory effects of the phosphodiesterase type 4 inhibitor CHF6001 on bronchoalveolar lavage lymphocytes from asthma patients. Cytokine. 2018 Jun 19     [PubMed]
Gosens R,Gross N, The mode of action of anticholinergics in asthma. The European respiratory journal. 2018 Aug 16     [PubMed]
Almadhoun K,Sharma S, Bronchodilators null. 2018 Jan     [PubMed]
Jilani TN,Sharma S, Theophylline null. 2018 Jan     [PubMed]
Melgarejo González-Conde V,Pérez-Fernández V,Ruiz-Esteban C,Valverde-Molina J, Impact of Self-Efficacy on The Quality of Life of Children With Asthma and Their Caregivers. Archivos de bronconeumologia. 2018 Aug 14     [PubMed]
Banasiak NC, Implementation of the Asthma Control Test in Primary Care to Improve Patient Outcomes. Journal of pediatric health care : official publication of National Association of Pediatric Nurse Associates     [PubMed]
Konstantakopoulou O,Kaitelidou D,Economou C,Charalambous G, Barriers in Access to Pharmaceutical Care in Greece: The Case Study of the Out-of-Hospital Management of Patients With Acute Asthma. Frontiers in public health. 2018     [PubMed]
Piñera Salmerón P,Delgado Romero J,Domínguez Ortega J,Labrador Horrillo M,Álvarez Gutiérrez FJ,Martínez Moragón E,Plaza Moral V,Álvarez Rodríguez C,Miguel Franco J, Management of asthma in the emergency department: a consensus statement. Emergencias : revista de la Sociedad Espanola de Medicina de Emergencias. 2018 Ago     [PubMed]
Chen S,Golam S,Myers J,Bly C,Smolen H,Xu X, Systematic literature review of the clinical, humanistic, and economic burden associated with asthma uncontrolled by GINA Steps 4 or 5 treatment. Current medical research and opinion. 2018 Aug 16     [PubMed]
Bernstein JA,Mansfield L, Step-up and step-down treatments for optimal asthma control in children and adolescents. The Journal of asthma : official journal of the Association for the Care of Asthma. 2018 Jul 4     [PubMed]

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