Management of Acute Bronchial Asthma Attack

Initial Assessment and Recognition

The American College of Physicians recommends recognizing acute severe asthma by the following clinical features: inability to speak in complete sentences, respiratory rate >25 breaths/min, heart rate >110 beats/min, and peak expiratory flow (PEF) <50% of predicted or personal best 1
Life-threatening features requiring immediate ICU consideration include PEF <33% predicted, silent chest on auscultation, cyanosis or weak respiratory effort, altered mental status or confusion, and PaCO₂ ≥42 mmHg 1, 2

The American Thoracic Society recommends administering high-flow oxygen (40-60%) via face mask to maintain SaO₂ >92% (>95% in pregnant patients or those with cardiac disease) 1, 2
The European Respiratory Society suggests using nebulized beta-agonist as the cornerstone of acute treatment, with salbutamol 5 mg via oxygen-driven nebulizer as the first-line option 1, 3
The American Academy of Pediatrics recommends administering corticosteroids immediately, with prednisolone 30-60 mg orally (or hydrocortisone 200 mg IV if unable to take oral medication) for adults, and prednisolone 1-2 mg/kg body weight orally (maximum 40 mg) for children 1, 3, 4, 5

The British Thoracic Society recommends measuring PEF and reassessing clinical status after initial treatment, and escalating treatment immediately if the patient does not improve 3
The American College of Chest Physicians suggests considering IV magnesium sulfate 2 g over 20 minutes for life-threatening exacerbations or severe exacerbations remaining after 1 hour of intensive treatment 2

The American Academy of Emergency Medicine recommends never administering sedatives of any kind during an acute asthma exacerbation, as this can precipitate respiratory failure 1, 3
The European Respiratory Society advises against underestimating severity based on initial presentation, as patients can deteriorate rapidly 3, 6

The American Thoracic Society recommends continuous monitoring of pulse oximetry to maintain SaO₂ >92%, PEF measurement before and after each nebulization, and respiratory rate and heart rate every 15-30 minutes initially 1, 3
The American College of Physicians suggests monitoring arterial blood gas if PEF <25% predicted, severe distress, or suspected hypoventilation 3

The American Academy of Pediatrics recommends admitting to hospital if life-threatening characteristics are present, severe exacerbation persists after initial treatment, PEF <33% after treatment, recent nocturnal symptoms or previous severe attacks, or inability to assess own condition 3

The British Thoracic Society recommends recognizing signs requiring immediate intubation consideration, including inability to speak, worsening confusion or altered mental status, intercostal retraction with worsening fatigue, rising PaCO₂ ≥42 mmHg, and exhaustion despite maximal therapy 2, 6
The American College of Emergency Medicine advises that when intubation becomes necessary, it should not be attempted until the most expert available physician (ideally an anesthetist) is present 6, 4

Asthma exacerbations are characterized by progressive dyspnea, wheezing, chest tightness, and cough that improve with bronchodilator therapy and show objective airflow obstruction on peak expiratory flow measurement. 7, 8

The first step in any acute dyspneic episode is to exclude severe asthma; life‑threatening features include peak expiratory flow < 33 % predicted, silent chest, cyanosis, altered mental status, or a normal/elevated PaCO₂ ≥ 42 mm Hg. 7, 8

In confirmed asthma exacerbations, high‑dose inhaled β‑agonist (e.g., albuterol) plus systemic corticosteroids should be administered immediately; sedatives or benzodiazepines are contraindicated because they may precipitate respiratory failure. 7, 8

Benzodiazepines should be avoided or used only as a short‑term bridge in panic disorder due to the risk of respiratory depression during asthma exacerbations. 7, 8

Dyspnea must not be assumed to be “just anxiety” without objective lung function testing (PEF or FEV₁); failure to measure can lead to preventable asthma deaths. 7, 8
Sedative agents should not be given during acute presentations until severe asthma has been definitively ruled out with objective testing. 7, 8