The effectiveness of inhaled corticosteroids in the emergency department treatment of acute asthma: a meta-analysis

Nebulized Budesonide vs. Placebo in Adults with Asthma Attack; a Double Blind Randomized Placebo-Controlled Clinical Trial

Introduction:

Asthma is one of acute respiratory diseases leading to emergency department (ED) referral. Management of acute attack plays an important role in its outcome.

Objective:

This trial was designed to evaluate the effectiveness of nebulized budesonide versus placebo in moderate to severe acute asthma attack in adults in the ED.

Method:

In this clinical trial, we enrolled patients with acute exacerbation of asthma and standard treatment of acute asthma attack was administered to all of them. 41 patients in our study were randomly entered into 2 groups. In one group, we prescribed nebulized budesonide and in the other group nebulized placebo (normal saline) was administered. Patients’ demographic data, vital signs, symptoms’ acuity and the time of symptom relief, patient and physician satisfaction were all recorded and compared between the 2 groups. All cases were followed and disease outcome, readmission, mortality and morbidity rates were documented.

Results:

In this study, 20 patients were entered the budesonide group and 19 patients were enrolled in the placebo group. The mean age ranges were 55.70±15.30 and 60.32±18.41 years old respectively. Heart rate, respiratory rate and O2 saturation in the first group were improved significantly after the treatment in comparison to the second group (p<0.05). The mean time of recovery and length of hospital stay were better in the first group than the second group but this difference was not significant (p>0.05).

Conclusion:

The addition of nebulized budesonide to standard asthma treatment might result in more improvement in O2 saturation and less patient’s distress.

Pneumologie

Die Pneumologie und Beatmungsmedizin gehört zur Basis der Intensivmedizin. Die Abklärung der Dyspnoe, das Management des Asthma bronchiale, der akuten COPD-Exazerbation und des akuten Lungenversagens (ARDS) bilden die Säulen dieses Kapitels. Im Rahmen der bettseitigen Abklärung der Dyspnoe gewinnt die Lungen- bzw. Thoraxsonographie zunehmend an Bedeutung.

Acute asthma exacerbations in childhood: risk factors, prevention and treatment

Asthma is a heterogeneous disease more appropriately seen as a syndrome rather than a single pathologic entity. Although it can remain quiescent for extended time periods, the inflammatory and remodeling processes affect the bronchial milieu and predispose to acute and occasionally severe clinical manifestations. The complexity underlying these episodes is enhanced during childhood, an era of ongoing alterations and maturation of key biological systems. In this review, the authors focus on such sudden-onset events, emphasizing on their diversity on the basis of the numerous asthma phenotypes.

Early use of inhaled corticosteroids in the emergency department treatment of acute asthma

BACKGROUND

Systemic corticosteroid therapy is central to the management of acute asthma. The use of inhaled corticosteroids (ICS) may also be beneficial in this setting.

OBJECTIVES

To determine the benefit of ICS for the treatment of patients with acute asthma managed in the emergency department (ED).

SEARCH METHODS

We identified controlled clinical trials from the Cochrane Airways Group specialised register of controlled trials. Bibliographies from included studies, known reviews, and texts also were searched. The latest search was September 2012.

SELECTION CRITERIA

We included randomised controlled trials (RCTs) and quasi-RCTs. Studies were included if patients presented to the ED or its equivalent with acute asthma, and were treated with ICS or placebo, in addition to standard therapy. Two review authors independently selected potentially relevant articles, and then independently selected articles for inclusion. Methodological quality was independently assessed by two review authors. There were three different types of studies that were included in this review: 1) studies comparing ICS vs. placebo, with no systemic corticosteroids given to either treatment group, 2) studies comparing ICS vs. placebo, with systemic corticosteroids given to both treatment groups, and 3) studies comparing ICS alone versus systemic corticosteroids. For the analysis, the first two types of studies were included as separate subgroups in the primary analysis (ICS vs. placebo), while the third type of study was included in the secondary analysis (ICS vs. systemic corticosteroid).

DATA COLLECTION AND ANALYSIS

Data were extracted independently by two review authors if the authors were unable to verify the validity of extracted information. Missing data were obtained from the authors or calculated from other data presented in the paper. Where appropriate, individual and pooled dichotomous outcomes were reported as odds ratios (OR) with 95% confidence intervals (CIs). Where appropriate, individual and pooled continuous outcomes were reported as mean differences (MD) or standardized mean differences (SMD) with 95% CIs. The primary analysis employed a fixed-effect model and a random-effects model was used for sensitivity analysis. Heterogeneity is reported using I-squared (I(2)) statistics.

MAIN RESULTS

Twenty trials were selected for inclusion in the primary analysis (13 paediatric, seven adult), with a total number of 1403 patients. Patients treated with ICS were less likely to be admitted to hospital (OR 0.44; 95% CI 0.31 to 0.62; 12 studies; 960 patients) and heterogeneity (I(2) = 27%) was modest. This represents a reduction from 32 to 17 hospital admissions per 100 patients treated with ICS in comparison with placebo. Subgroup analysis of hospital admissions based on concomitant systemic corticosteroid use revealed that both subgroups indicated benefit from ICS in reducing hospital admissions (ICS and systemic corticosteroid versus systemic corticosteroid: OR 0.54; 95% CI 0.36 to 0.81; 5 studies; N = 433; ICS versus placebo: OR 0.27; 95% CI 0.14 to 0.52; 7 studies; N = 527). However, there was moderate heterogeneity in the subgroup using ICS in addition to systemic steroids (I(2) = 52%). Patients receiving ICS demonstrated small, significant improvements in peak expiratory flow (PEF: MD 7%; 95% CI 3% to 11%) and forced expiratory volume in one second (FEV(1): MD 6%; 95% CI 2% to 10%) at three to four hours post treatment). Only a small number of studies reported these outcomes such that they could be included in the meta-analysis and most of the studies in this comparison did not administer systemic corticosteroids to either treatment group. There was no evidence of significant adverse effects from ICS treatment with regard to tremor or nausea and vomiting. In the secondary analysis of studies comparing ICS alone versus systemic corticosteroid alone, heterogeneity among the studies complicated pooling of data or drawing reliable conclusions.

AUTHORS' CONCLUSIONS

ICS therapy reduces hospital admissions in patients with acute asthma who are not treated with oral or intravenous corticosteroids. They may also reduce admissions when they are used in addition to systemic corticosteroids; however, the most recent evidence is conflicting. There is insufficient evidence that ICS therapy results in clinically important changes in pulmonary function or clinical scores when used in acute asthma in addition to systemic corticosteroids. Also, there is insufficient evidence that ICS therapy can be used in place of systemic corticosteroid therapy when treating acute asthma. Further research is needed to clarify the most appropriate drug dosage and delivery device, and to define which patients are most likely to benefit from ICS therapy. Use of similar measures and reporting methods of lung function, and a common, validated, clinical score would be helpful in future versions of this meta-analysis.

Critical care in the ED: potentially fatal asthma and acute lung injury syndrome

Emergency department clinicians are frequently called upon to assess, diagnose, and stabilize patients who present with acute respiratory failure. This review describes a rapid initial approach to acute respiratory failure in adults, illustrated by two common examples: (1) an airway disease – acute potentially fatal asthma, and (2) a pulmonary parenchymal disease – acute lung injury/acute respiratory distress syndrome. As such patients are usually admitted to hospital, discussion will be focused on those initial management aspects most relevant to the emergency department clinician.

Differentiating chronic obstructive pulmonary disease from asthma

PURPOSE

Chronic obstructive pulmonary disease (COPD) and asthma are chronic diseases that are increasing worldwide in incidence, prevalence, and burden. The purpose of this article is to provide nurse practitioners (NPs) with the information necessary to make a differential diagnosis and to understand the different treatment approaches to these two diseases.

DATA SOURCES

Peer-reviewed journal articles, book chapters, and evidence-based Internet sources.

CONCLUSIONS

NPs who are familiar with the pathophysiology that differentiates COPD from asthma can make an appropriate diagnosis and initiate effective pharmacologic and nonpharmacologic interventions, which may lead to a reduced incidence of exacerbations.

IMPLICATIONS FOR PRACTICE

A misdiagnosis of COPD or asthma leads to inadequate management of patients and to escalating healthcare costs. An early and accurate diagnosis can help to ensure optimal and cost-effective management of patient care.

Nebulized racemic epinephrine used in the treatment of severe asthmatic exacerbation: a case report and literature review

Acute asthma is a common emergency department (ED) problem that is typically treated with bronchodilators and anti-inflammatories. Nebulized selective, short-acting beta-agonists, such as salbutamol, are the bronchodilators of choice in most Canadian EDs. Other important treatments in moderate-to-severe cases include systemic corticosteroids and in severe cases may include the addition of ipratropium bromide and magnesium sulfate. Despite aggressive management, some patients do not respond adequately to nebulized salbutamol. Treatment options in these patients are limited to interventions such as parenteral epinephrine, and non-invasive and mechanical ventilation (or both). Both parenteral epinephrine and mechanical ventilation have associated risks, so alternative treatments with a lower risk profile would be useful for the treatment of life-threatening asthma. The following case report describes a patient in whom nebulized racemic epinephrine was used successfully to treat severe acute asthma following failure of standard first-line therapies.

Impact of allocation concealment on conclusions drawn from meta-analyses of randomized trials

BACKGROUND

Randomized trials without reported adequate allocation concealment have been shown to overestimate the benefit of experimental interventions. We investigated the robustness of conclusions drawn from meta-analyses to exclusion of such trials.

MATERIAL

Random sample of 38 reviews from The Cochrane Library 2003, issue 2 and 32 other reviews from PubMed accessed in 2002. Eligible reviews presented a binary effect estimate from a meta-analysis of randomized controlled trials as the first statistically significant result that supported a conclusion in favour of one of the interventions.

METHODS

We assessed the methods sections of the trials in each included meta-analysis for adequacy of allocation concealment. We replicated each meta-analysis using the authors' methods but included only trials that had adequate allocation concealment. Conclusions were defined as not supported if our result was not statistically significant.

RESULTS

Thirty-four of the 70 meta-analyses contained a mixture of trials with unclear or inadequate concealment as well as trials with adequate allocation concealment. Four meta-analyses only contained trials with adequate concealment, and 32, only trials with unclear or inadequate concealment. When only trials with adequate concealment were included, 48 of 70 conclusions (69%; 95% confidence interval: 56-79%) lost support. The loss of support mainly reflected loss of power (the total number of patients was reduced by 49%) but also a shift in the point estimate towards a less beneficial effect.

CONCLUSION

Two-thirds of conclusions in favour of one of the interventions were no longer supported if only trials with adequate allocation concealment were included.

Treatment strategies for reducing asthma-related emergency department visits

Acute asthma exacerbations reflect inadequate long-term disease control. Treatment to control acute asthma exacerbations includes: 1) rapid reversal of airflow obstruction with bronchodilators and systemic corticosteroids and reversing hypoxemia with oxygen in the emergency department (ED); 2) preventing early relapse by prescribing beta(2) agonists and oral corticosteroids at discharge and ensuring patients have an adequate supply of their other asthma medications; and 3) preventing future asthma exacerbations and ED visits through effective treatment in primary care. This article discusses each treatment and reviews the role of emergency physicians in treating patients to reverse airflow obstruction and prevent early relapse, future exacerbations, and ED visits by communicating the need for additional asthma control to patients' primary care physicians.

High-dose inhaled fluticasone does not replace oral prednisolone in children with mild to moderate acute asthma

BACKGROUND

Inhaled corticosteroids are not as effective as oral corticosteroids in school-aged children with severe acute asthma. It is uncertain how inhaled corticosteroids compare with oral corticosteroids in mild to moderate exacerbations.

PRIMARY OBJECTIVE

The purpose of this work was to determine whether there is a significant difference in the percentage of predicted forced expiratory volume in 1 second in children with mild to moderate acute asthma treated with either inhaled fluticasone or oral prednisolone.

METHODS

This was a randomized, double-blind controlled trial conducted between 2001 and 2004 in a tertiary care pediatric emergency department. We studied a convenience sample of 69 previously healthy children 5 to 17 years of age with acute asthma and forced expiratory volume in 1 second at 50% to 79% predicted value; 41 families refused participation. Albuterol was given in the emergency department and salmeterol was given after discharge to all patients, as well as either 2 mg of fluticasone via metered dose inhaler and valved holding chamber in the emergency department plus 500 microg twice daily via Diskus for 10 doses after discharge (fluticasone group, N = 35) or 2 mg/kg of oral prednisolone in the emergency department plus 5 daily doses of 1 mg/kg of prednisolone after discharge (prednisolone group, N = 34). We measured a priori defined absolute change in percent predicted forced expiratory volume in 1 second from baseline to 4 and 48 hours in the 2 groups. RESULTS. At 240 minutes, the forced expiratory volume in 1 second increased by 19.1% +/- 12.7% in the fluticasone group and 29.8% +/- 15.5% in the prednisolone group. At 48 hours, this difference was no longer significant (estimated difference: 4.0 +/- 3.4; P = .14). The relapse rates by 48 hours were 12.5% and 0% in the fluticasone group and prednisolone group, respectively.

CONCLUSION

Airway obstruction in children with mild to moderate acute asthma in the emergency department improves faster on oral than inhaled corticosteroids.

Acute asthma during pregnancy

In addition to preventing maternal and fetal hypoxia, the goals of treating acute asthma exacerbation during pregnancy mirror those in the nongravid patient: rapid reversal of airflow obstruction with aerosolized bronchodilators,reduction of likelihood of recurrence by the addition of corticosteroids, and ongoing assessment of mother and fetus. Disposition decisions are multifaceted and must take into account the health and well-being of the pregnant patient and that of her fetus. Discharge planning includes prescription of scheduled 3-2 agonist treatments until symptoms resolve, intensification of daily treatment as needed, prescriptions for systemic and ICSs, as well provision of patient education, a personalized action plan, and close follow-up.

Short-term clinical outcomes of acute treatment of childhood asthma

PURPOSE OF REVIEW

Acute exacerbations of asthma are the leading cause of emergency department visits in the pediatric patient. The present review is focused on the identification of those factors that may contribute to improving the short-term outcome of children after discharge from an emergency department visit for acute asthma.

RECENT FINDINGS

Several recent studies have documented that children treated at the emergency department because of an asthma-related event present a high morbidity at 7 and 15 days after discharge, mainly associated with symptom persistence, need for rescue bronchodilator medication, and absenteeism from school or day nursery. A better control of the disease, particularly adequate outpatient follow-up and maintenance treatment with inhaled steroids, could improve short-term clinical outcomes.

SUMMARY

All efforts of emergency room management of children with asthma, identification of severity of the current exacerbation episode, and intensive treatment of the acute asthma attack have usually been directed at reducing the rates of hospitalization and the return for medical care. However, according to reported data on short-term morbidity, it is necessary to define therapeutic and follow-up strategies after treatment for acute asthma and emergency department discharge. Besides standard treatment for an acute asthma exacerbation in a pediatric emergency department, action plans should include a review of the maintenance treatment of asthma to improve underlying disease control and a strong recommendation for close follow-up by the primary care pediatrician.

Comparison of inhaled fluticasone with intravenous hydrocortisone in the treatment of adult acute asthma

RATIONALE

Several studies published in the second half of the 1990s have shown a therapeutic early effect of inhaled corticosteroids in acute asthma. However, systemic corticosteroids are considered the standard of care.

OBJECTIVES

To compare the effect of repeated doses of inhaled fluticasone with the standard treatment of systemic corticosteroids in adult patients with severe acute asthma.

METHODS

One hundred six patients (mean age, 33.5 +/- 8.8 years) were randomly assigned to receive fluticasone (3,000 microg/hour) administered through a metered-dose inhaler and spacer at 10-minute intervals for 3 hours, or 500 mg of intravenous hydrocortisone. In addition, all patients received inhaled albuterol and ipratropium bromide.

MAIN RESULTS

Subjects treated with fluticasone showed 30.5 and 46.4% greater improvements in PEF and FEV1, respectively, compared with the hydrocortisone group. The fluticasone group had better PEF and FEV1 at 120, 150, and 180 minutes (p < 0.05). Also, the fluticasone group showed higher rates of patients who obtained the discharge threshold at 90, 120, and 150 minutes. This therapeutic benefit was particularly evident in those patients with the most severe obstruction. Subjects with a baseline FEV1 of less than 1 L treated with fluticasone showed a significant increase in pulmonary function (p = 0.001) and a significant decrease in hospitalization rate (p = 0.05).

CONCLUSIONS

The use of repeated doses of inhaled fluticasone was more effective than intravenous hydrocortisone and was associated with an early improvement. This therapeutic benefit was particularly evident in those patients with the most severe obstruction.

Do the residents in the emergency department appropriately manage patients with acute asthma attack? A study of self-criticism

The objective of this study was to investigate the management of patients with asthma attack admitted to the emergency department (ED) in terms of compliance with international guidelines. The records of patients with asthma who were admitted to a university-based ED between December 2001 and December 2002 were evaluated. A total of 72 cases with available data were evaluated retrospectively. Twenty-six patients (36.1%) were admitted more than once during the study period. The number of multiple admissions ranged from 2 (15 patients, 20.0%) to 11 (2 patients, 2.8%). Peak expiratory flow (PEF) measurements were recorded in 17 patients (23.6%) on presentation. Pulse and respiratory rates were recorded in 70 (97.0%) and 67 patients (93.0%), respectively. Thirty-four patients (47.2%) underwent chest x-ray; results were normal in most patients. Salbutamol was the most commonly used drug as first-line therapy. Ipratropium bromide (inhaled) and systemic corticosteroids were added to the salbutamol in 47 (65.2%), 42 (58.4%), and 32 patients (44%), respectively. Pulmonologists were consulted in only 7 cases (9.7%). Thirty patients (43.4%) were prescribed corticosteroids on discharge. The role of functional parameters in determining asthma severity and monitoring treatment effects should be emphasized in clinical practice. Finally, more prevalent use of management guidelines will help determine their usefulness.

Oral corticosteroid-sparing effects of inhaled corticosteroids in the treatment of persistent and acute asthma

OBJECTIVE

To review the efficacy and safety of inhaled corticosteroids (ICSs) when used to reduce daily oral corticosteroid (OCS) requirements in patients with severe persistent asthma and periodic requirements in patients with acute asthma exacerbations.

DATA SOURCES

Clinical studies of the OCS-sparing effects of ICSs were located by searching MEDLINE databases from 1966 onward using the terms oral, steroid, and asthma in combination with the generic names for each marketed ICS.

STUDY SELECTION

Studies reporting on the use of ICSs to reduce OCS requirements in patients with persistent and acute asthma are included.

RESULTS

Clinical study results consistently show that ICSs significantly improve asthma control and reduce OCS requirements among adults, children, and infants with persistent asthma. A dose reduction or complete discontinuation of use of OCSs is possible in most patients without loss of asthma control. ICSs also can control asthma during acute asthma exacerbations and reduce the need for short courses of OCSs. With many ICSs, the reductions in OCS use are accompanied by recovery of hypothalamic-pituitary-adrenal axis function, indicating that the safety of asthma therapy is improved when OCS requirements are decreased with ICSs. Of the available ICSs that may reduce OCS needs, budesonide appears to be the most intensively studied.

CONCLUSIONS

ICSs can reduce OCS requirements in adults and children with persistent asthma and during acute asthma exacerbations. The reduced systemic corticosteroid activity associated with ICS treatment improves the overall safety of asthma therapy.

Acute asthma in adults: a review

All patients with asthma are at risk of having exacerbations. Hospitalizations and emergency department (ED) visits account for a large proportion of the health-care cost burden of asthma, and avoidance or proper management of acute asthma (AA) episodes represent an area with the potential for large reductions in health-care costs. The severity of exacerbations may range from mild to life threatening, and mortality is most often associated with failure to appreciate the severity of the exacerbation, resulting in inadequate emergency treatment and delay in referring to hospital. This review describes the epidemiology, costs, pathophysiology, mortality, and management of adult AA in the ED and in the ICU.

Treating exacerbations of asthma in children: the role of systemic corticosteroids

OBJECTIVE

To review the use of systemic corticosteroids to treat recurrent, acute asthma episodes in children, with a focus on the role of oral corticosteroids.

METHODS

A comprehensive review of the literature was performed using the Medline database (January 1966-October 2002) and the Embase database (January 1980-August 2002).

RESULTS

The significant findings of 17 selected, controlled clinical trials of oral corticosteroids (OCSs) for acute exacerbations of asthma in children, compared with placebo or with other formulations of corticosteroids, can be summarized as follows: 1) OCSs are effective for the outpatient treatment of acute asthma, 2) pulmonary function tests may not be the best means of assessing the efficacy of OCSs for acute asthma, 3) early administration of OCSs for acute asthma reduces hospitalizations, 4) the critical factor for a positive outcome is early administration of the corticosteroid, and 5) OCSs are preferred for the outpatient treatment of acute asthma.

CONCLUSIONS

Early treatment of acute asthma symptoms with OCSs in children with a pattern of recurrent acute asthma may decrease the severity of acute asthma episodes and reduce the likelihood of subsequent relapses. Attention should be given to identifying these children and standardizing a treatment approach based on accepted, consistent definitions of what constitutes an asthma exacerbation and recurrence. A suggested protocol is described.

Inhaled therapy for acute adult asthma

PURPOSE OF REVIEW

To evaluate recent developments on emergency department inhalotherapy in non-intubated acute adult asthma patients.

RECENT FINDINGS

There is evidence that high-flow oxygen can be associated with hypercarbia, and that full humidification of the inspired gases should be recommended. On the contrary, there is a lack of evidence to support the role of heliox in the initial treatment of acute asthma. Specific short-acting inhaled beta(2)-agonists are the drugs of choice. A more rapid and profound bronchodilatation with fewer side effects and less time of treatment can be achieved when sufficient doses are given using pressurized meter dose inhalers and large-volume valved-spacers, particularly in patients with the most severe obstruction. Findings argue against the routine use of continuous nebulization. High and repetitive doses of ipratropium bromide in combination with beta(2)-agonists are indicated as first line treatment of severe acute asthma. There is insufficient evidence that inhaled corticosteroids alone are as effective as systemic corticosteroids. Finally, the combination of nebulized magnesium and albuterol provides no benefit in addition to that provided by therapy with albuterol in patients with mild-to-moderate asthma exacerbations.

SUMMARY

According to the latest evidence, the goals of treatment may be summarized as follows: maintenance of adequate arterial oxygen saturation with supplemental oxygen, relief of airflow obstruction by administration of inhaled beta-agonists and anticholinergics, and reduction of airway inflammation and prevention of future relapses by using early administration of systemic corticosteroids.

Triple inhaled drug protocol for the treatment of acute severe asthma

STUDY OBJECTIVE

This study tests the hypothesis that the administration of multiple doses of inhaled albuterol (A), ipratropium bromide (IB), and flunisolide (F) provides an additional benefit to adults with acute severe asthma compared with the administration of A plus IB (A/IB) or A plus F (A/F).

DESIGN

Randomized, double-blind, prospective trial.

PATIENTS AND INTERVENTIONS

One hundred seventy-two patients who presented to an emergency department were assigned to receive A, IB, and F (ie, triple drug treatment [TDG]; 56 patients), A/IB (60 patients), or A/F (56 patients). All drugs were administered through a metered-dose inhaler and spacer at 10-min intervals for 3 h.

RESULTS

Patients who received TDG had an overall 64% greater improvement (95% confidence interval [CI], 24 to 103%; p = 0.002) in FEV(1) (mean [+/- SD], 2.1 +/- 0.6 L) than those who received A/F (mean, 1.7 +/- 0.6 L), and a 41% greater improvement (95% CI, 1 to 80%; p = 0.04) than those who received A/IB (mean, 1.8 +/- 0.6 L). Differences between groups increased with time (p = 0.001). At 3 h, there was a trend toward a reduction in hospital admission rates (A/IB group, 25%; A/F group, 20%; and TDG group, 11%). The patients who were the most likely to benefit (ie, those with a greater improvement in pulmonary function and a significant reduction in the hospitalization rate) from TDG were those with more severe obstruction (ie, FEV(1), < 30% of predicted). The benefit of TDG was equally evident independent of the patient's previous use of corticosteroids.

CONCLUSIONS

The data suggest that there was a therapeutic benefit from the addition of IB and F to A administered in high doses, particularly in those patients in whom the FEV(1) was < 30% of the predicted value.