Asthma Emergencies: Assessment, Acute Treatment and EMT Management

1. Learning objectives

• Define asthma, exacerbation, status asthmaticus and life-threatening asthma.
• Explain airway inflammation, bronchoconstriction, mucus plugging and dynamic hyperinflation.
• Perform an immediate ABCDE assessment and classify an attack by clinical severity.
• Describe first aid, inhaler/spacer use, nebulised bronchodilators, corticosteroids, oxygen and escalation.
• Recognise impending respiratory failure, silent chest, fatigue, altered consciousness and dangerous mimics.
• Adapt care for children, pregnancy, older adults and patients with cardiac or other comorbid disease.
• Plan observation, discharge, inhaler technique, controller therapy, trigger reduction and a written action plan.

2. What is asthma?

Asthma is a chronic condition with variable respiratory symptoms and variable expiratory airflow limitation. Symptoms include wheeze, breathlessness, chest tightness and cough that change over time and intensity. Triggers may include viral infection, allergens, smoke, air pollution, occupational exposures, exercise, cold air, strong odours, stress and medicines such as aspirin/NSAIDs or beta-blockers in susceptible people.

3. Why severe asthma causes respiratory failure

Expiratory airflow becomes limited, so the patient cannot empty the lungs before the next breath. Air trapping and dynamic hyperinflation increase the work of breathing, flatten the diaphragm and reduce venous return. Early in an attack, the patient may hyperventilate and have a low carbon dioxide level. A normal or rising PaCO₂ in a patient who is still struggling is ominous because it suggests fatigue and failing ventilation. Severe hypoxaemia, acidosis, dehydration, mucus plugging and barotrauma can follow.

• Increased work: accessory muscle use, prolonged expiration, inability to speak full sentences and exhaustion.
• Ventilation mismatch: wheeze, reduced air entry and hypoxaemia from unevenly obstructed airways.
• Cardiovascular effects: tachycardia, pulsus paradoxus, hypotension and reduced venous return from hyperinflation.
• Terminal signs: confusion, drowsiness, bradycardia, cyanosis, silent chest, poor respiratory effort or arrest.

4. Focused history

1. Symptoms and time course: onset, speed of worsening, wheeze, cough, chest tightness, nocturnal symptoms, fever, sputum and chest pain.
2. Previous risk: prior ICU/intubation, hospital admissions, recent emergency visits, previous near-fatal attack, frequent reliever use or poor response to the home plan.
3. Current treatment: controller inhaler, reliever, adherence, last dose, spacer use, oral steroids, nebuliser access and recent antibiotic/NSAID/beta-blocker exposure.
4. Trigger and exposure: viral illness, allergen, smoke, occupational dust/chemicals, exercise, cold air, new food/medicine, emotional stress and pregnancy.
5. Comorbidity/mimics: heart disease, COPD, pneumonia, tuberculosis, anaphylaxis, foreign body, pulmonary embolism, pneumothorax, sickle cell disease and metabolic disease.
6. Impact: ability to speak, walk, drink, sleep, lie flat and perform usual activities; ask about prior peak-flow values if available.

5. Severity assessment: never grade by wheeze alone

6. Differential diagnosis and red flags

• Anaphylaxis: wheeze plus urticaria, facial/tongue swelling, stridor, hypotension, vomiting or sudden exposure—give IM adrenaline promptly according to protocol.
• Foreign-body obstruction: sudden onset during eating/play, unilateral signs, choking or absent wheeze; use choking algorithm and urgent airway support.
• Pneumothorax: sudden pleuritic pain, unilateral absent breath sounds, tracheal deviation, hypotension or severe distress.
• Pneumonia/TB: fever, focal crackles, pleuritic pain, haemoptysis, weight loss or exposure; use appropriate infection precautions.
• Cardiac failure/pulmonary oedema: orthopnoea, oedema, hypertension, crackles, cardiac history and frothy sputum.
• Pulmonary embolism: pleuritic pain, syncope, risk factors, disproportionate tachycardia or hypoxaemia.
• Metabolic/toxic causes: diabetic ketoacidosis, salicylate toxicity, panic, severe anaemia or sepsis can mimic breathlessness.

7. First contact and ABCDE actions

8. Immediate treatment of an acute attack

8.1 Position, reassurance and oxygen

• Place the patient upright, leaning forward if comfortable; do not force them to lie flat.
• Use calm, short explanations. Anxiety increases ventilatory demand, but do not label severe dyspnoea as “just anxiety.”
• Give controlled oxygen for hypoxaemia or severe distress, targeting the saturation range in the local protocol. Avoid withholding oxygen from a critically ill patient.
• Monitor SpO₂, respiratory rate, pulse, BP, speech, effort and mental status continuously or at very short intervals according to severity.

8.2 Inhaled bronchodilator

• Use salbutamol/albuterol by a metered-dose inhaler with spacer for a patient who can cooperate, or a nebuliser for severe distress, poor coordination or inability to use a spacer.
• Repeat doses according to the emergency protocol and response. Oxygen-driven nebulisation is preferred for severe hypoxaemia where available.
• Add nebulised ipratropium for severe or life-threatening attacks as directed; it can improve bronchodilation when combined with salbutamol.
• Check technique: shake inhaler, attach spacer, one puff at a time, slow inhalation and several breaths through the spacer. A mask may be needed for a small child.
• Watch for tremor, tachycardia, hypokalaemia, lactic acidosis and arrhythmia, especially after repeated high-dose therapy.

8.3 Corticosteroid early

Systemic corticosteroid reduces airway inflammation and relapse risk; it should be given early in moderate, severe or poorly responsive exacerbations under prescription/protocol. Oral prednisolone is usually effective when the patient can swallow; IV hydrocortisone or another approved preparation is used when vomiting, reduced consciousness or absorption concerns exist. Dose and duration depend on age, weight and the current Uganda/facility guideline.

8.4 Escalation therapies

• Urgent senior review for repeated bronchodilator need, persistent hypoxaemia, severe PEF reduction, exhaustion, altered consciousness, silent chest or rising CO₂.
• IV magnesium sulfate may be considered for severe, refractory bronchospasm under clinician direction and monitoring.
• Prepare non-invasive or invasive ventilatory support when respiratory failure develops. Intubation is high risk because dynamic hyperinflation can cause hypotension and barotrauma.
• Use ketamine or other induction/analgesia only by an experienced airway team with full monitoring; do not sedate an unprotected patient merely to make them quiet.
• Antibiotics are not routine for an uncomplicated asthma attack; use them only when bacterial infection is clinically suspected or proven.

9. Reassessment after each treatment cycle

1. Ask whether speech, chest tightness and breathlessness are improving.
2. Recheck respiratory rate, pulse, BP, SpO₂, air entry, accessory muscle use, mental state and ability to drink.
3. Repeat PEF/FEV₁ only when the patient can perform it safely; never delay treatment or exhaust a severely breathless patient for a number.
4. Look for paradoxical deterioration: less wheeze with poorer air entry, rising fatigue, agitation turning to drowsiness, or a normalising/rising CO₂.
5. Document time, medicine, route, dose, response and escalation. If improvement is incomplete or short-lived, transfer/admit rather than repeatedly discharging.

10. Investigations

• Peak expiratory flow: compare with personal best or predicted value when safe; trend is more useful than one isolated reading.
• Blood gas: consider in severe or life-threatening disease, exhaustion, altered mental status, hypoxaemia or suspected hypercapnia.
• Chest radiograph: not routine for a typical attack; use for focal signs, fever, chest pain, suspected pneumothorax, pneumonia, foreign body or poor response.
• ECG/electrolytes: useful with severe tachycardia, repeated beta-agonist doses, chest pain, arrhythmia or cardiac disease.
• Blood tests: target them to the clinical question. Eosinophils, infection markers or allergy tests do not replace immediate clinical treatment.
• Pregnancy test: consider where imaging or teratogenic medicine decisions may be affected.

11. Severe and life-threatening asthma pathway

• Use continuous ECG/SpO₂ monitoring and frequent BP/mental-state checks.
• Keep the patient upright if conscious; prepare suction, bag-mask, airway adjuncts and a difficult-airway plan.
• Do not allow a deteriorating patient to walk to radiology or wait unobserved for a bed.
• Secure IV access, take targeted investigations without delaying treatment and maintain careful fluid balance.
• Discuss transfer to a facility with mechanical ventilation if the present setting cannot provide it.
• After intubation, use a strategy that allows long expiration, low respiratory rate/pressures and permissive hypercapnia under critical-care supervision; squeezing the bag too rapidly can cause auto-PEEP and hypotension.

12. Paediatric asthma emergency care

• Assess interaction, feeding, crying/speech, retractions, nasal flaring, respiratory rate, SpO₂, air entry and exhaustion. A child can deteriorate quickly.
• Use a spacer with a mask or age-appropriate mouthpiece whenever possible; involve the caregiver and demonstrate technique.
• Use weight/age-based salbutamol, ipratropium and steroid regimens from the current paediatric protocol; do not copy adult doses.
• Consider bronchiolitis, croup, foreign body, pneumonia, anaphylaxis, congenital heart disease and metabolic illness in a first-ever wheeze.
• Admit or refer a child with persistent oxygen need, poor feeding, exhaustion, altered consciousness, previous ICU attack or inadequate home supervision.

13. Pregnancy and comorbidity

• Untreated maternal hypoxaemia is dangerous; treat acute asthma promptly and involve obstetric services for severe attacks.
• Check medication history, anaemia, cardiac disease, HIV, tuberculosis exposure and sickle cell disease where relevant.
• Older adults may have asthma-COPD overlap or heart failure; listen for crackles, assess oedema and review smoking/occupational history.
• Diabetes may worsen with systemic steroids; monitor glucose and coordinate adjustment with the clinician.
• Do not withhold indicated inhaled corticosteroids or bronchodilators solely because the patient is pregnant; use current specialist guidance.

14. Nursing and EMT care plan

15. Observation, admission and discharge

Consider admission/transfer when

• Life-threatening features, persistent hypoxaemia, rising CO₂, poor response or repeated reliever therapy.
• Previous ICU/intubation, recent hospitalisation, severe comorbidity, pregnancy, frailty or unreliable access to follow-up.
• Need for frequent nebulisers, IV therapy, systemic steroids, ventilatory support or treatment of pneumonia/anaphylaxis.

Before safe discharge

• Symptoms and observations are stable after an appropriate observation period and reliever need is decreasing.
• Patient can walk, speak and eat/drink without distress; oxygenation is acceptable without new support.
• Provide an ICS-containing controller plan when indicated, a reliever plan, correct inhaler/spacer technique and an action plan.
• Check adherence, affordability, triggers, smoking exposure, vaccination and follow-up within the recommended interval.
• Give written red flags: inability to speak, blue lips, drowsiness, silent chest, worsening despite reliever or need for reliever more often than advised.

16. Long-term prevention of future emergencies

• Use an inhaled corticosteroid-containing controller as recommended; reliever-only treatment leaves airway inflammation and exacerbation risk inadequately addressed.
• Check technique at every opportunity: device preparation, seal, slow inhalation, breath hold, spacer cleaning and mouth rinsing after steroid inhalation.
• Identify and reduce smoke, biomass fuel, occupational dust, mould, allergens, cold air and medication triggers.
• Manage rhinitis, reflux, obesity, sleep problems, anxiety, depression and other comorbidity that worsens control.
• Encourage vaccination, exercise within control, nutrition, an asthma diary/peak-flow plan and early action at the first deterioration.
• Review every exacerbation: Was the trigger recognised? Was the controller used? Was access to medicines interrupted? Is referral needed?

17. Clinical scenarios

18. Common errors to avoid

• Judging severity by wheeze volume rather than speech, effort, air entry, fatigue and mental state.
• Delaying bronchodilator or steroid while waiting for PEF, imaging or laboratory results.
• Using sedatives, opioids or cough suppressants that depress ventilation in an exhausted patient.
• Giving antibiotics for every exacerbation without evidence of bacterial infection.
• Forgetting ipratropium, magnesium/critical-care referral or transfer planning in refractory severe disease.
• Discharging without checking inhaler technique, controller therapy, access to medication and return precautions.
• Ventilating an intubated asthmatic too fast, causing air trapping, hypotension and barotrauma.

19. Revision questions

1. Explain the three main airway changes during an acute asthma attack.
2. List six findings that indicate severe or life-threatening asthma.
3. Why can a silent chest be more dangerous than loud wheeze?
4. Describe the first five minutes of care for a patient with severe asthma.
5. When are ipratropium, systemic corticosteroids and magnesium considered?
6. List five differentials for sudden wheeze and one clue for each.
7. What must be checked before discharging a patient after an exacerbation?
8. How does an EMT reduce future asthma emergencies through education?

20. Key take-home points

• Asthma severity is a clinical judgement; a quiet chest in a tiring patient is an emergency.
• Position upright, assess ABCDE, provide oxygen when indicated and deliver inhaled bronchodilator without delay.
• Systemic corticosteroids should be given early in moderate/severe exacerbations under protocol.
• Look actively for anaphylaxis, foreign body, pneumothorax, pneumonia, cardiac disease and pulmonary embolism.
• Repeated reassessment and early critical-care referral save lives; treatment response must be documented.
• Controller therapy, inhaler technique and a written action plan prevent future attacks.

References for further study

• Global Initiative for Asthma (GINA): current strategy and summary guides
• WHO: Asthma fact sheet
• NHS: Asthma and hospital treatment of attacks
• Uganda Ministry of Health: current asthma, emergency-care and essential-medicines guidelines.