What is the recommended approach to assess and manage a patient presenting with breathlessness?

Approach to Breathlessness

Begin by immediately assessing for life-threatening causes while measuring oxygen saturation with pulse oximetry and vital signs, then tailor oxygen therapy to target 94-98% for most patients or 88-92% for those at risk of hypercapnic respiratory failure, while simultaneously positioning the patient upright and implementing non-pharmacological measures. 1

Immediate Assessment and Stabilization

Life-Threatening Evaluation

• Tap the patient's shoulder and shout "Are you all right?" to assess responsiveness, while simultaneously checking for absent or abnormal breathing (gasping does not count as normal breathing). 1
• If unresponsive with no breathing or only gasping, activate emergency response and begin CPR immediately—healthcare providers should check for a pulse taking no more than 10 seconds, and if no definite pulse is felt, start chest compressions. 1
• Ensure scene safety before approaching the patient. 1

Vital Signs and Oxygen Saturation

• Measure oxygen saturation using pulse oximetry immediately in all patients presenting with breathlessness. 1, 2
• Check respiratory rate, heart rate, and blood pressure to assess severity. 1, 2
• Record oxygen saturation, delivery system, and flow rate on patient monitoring charts. 2

Common Pitfall: Pulse oximetry has limitations—in stable COPD patients undergoing long-term oxygen therapy assessment, SpO2 >88% missed 10% of patients with severe hypoxemia (PaO2 ≤55 mm Hg), including 2.5% with SpO2 >92% (occult hypoxemia). 3 This rate increases to 13% false negatives and 5% occult hypoxemia in active smokers. 3 Consider arterial blood gas measurement if the patient appears more unwell than the SpO2 suggests or if there is clinical concern about hypercapnia. 2

Risk Stratification for Oxygen Therapy

Patients WITHOUT Risk of Hypercapnic Respiratory Failure

• Target oxygen saturation: 94-98% 4, 1, 2
• Start oxygen via nasal cannula (1-4 L/min) or simple face mask (5-10 L/min). 1

Patients WITH Risk of Hypercapnic Respiratory Failure

• Target oxygen saturation: 88-92% 4, 1, 2
• Use controlled oxygen via Venturi mask (24-28%). 1

Risk factors for hypercapnic respiratory failure include: 4, 2

• COPD (especially patients >50 years, long-term smokers with chronic breathlessness on minor exertion) 4
• Patients already on long-term oxygen therapy 4
• Morbid obesity (BMI >40 kg/m²) 4
• Neuromuscular disorders (especially if wheelchair-bound) 4
• Severe kyphoscoliosis or ankylosing spondylitis 4
• Cystic fibrosis 2
• Chest wall deformities 2
• Bronchiectasis with fixed airflow obstruction 4
• Home mechanical ventilation 4
• Overdose of opioids, benzodiazepines, or respiratory depressants 4

Critical Warning: If a patient with COPD is found to have respiratory acidosis due to excessive oxygen therapy (PO2 >10 kPa or 75 mm Hg), do NOT discontinue oxygen immediately—oxygen levels will fall significantly over 1-2 minutes while carbon dioxide takes much longer to correct. 4 Instead, step down to 28% or 35% oxygen from a Venturi mask, or 1-2 L/min from nasal cannulae, targeting 88-92% saturation. 4

Non-Pharmacological Interventions

Positioning

• Sit the patient upright to increase peak ventilation and reduce airway obstruction. 1
• Have the patient lean forward with arms bracing a chair or knees with upper body supported to improve ventilatory capacity. 1
• For pregnant women >20 weeks gestation, use left lateral positioning to avoid aortocaval compression. 2

Breathing Techniques

• Teach pursed-lip breathing: inhale through nose for several seconds with mouth closed, then exhale slowly through pursed lips for 4-6 seconds. 1
• Instruct patient to relax and drop shoulders to reduce the hunched posture associated with anxiety. 1
• Consider early involvement of physiotherapists for breathing techniques. 2

Hand-Held Fan

• A hand-held fan should be tried as first-line treatment for breathlessness when oxygen saturation is normal (SpO2 ≥94%). 4, 2
• This simple intervention should be attempted before oxygen therapy in non-hypoxemic patients. 4

Airway Management (If Needed)

• Open airway using head tilt-chin lift maneuver: place hand on forehead and gently tilt head back while lifting chin with fingertips. 1
• Avoid head tilt if trauma to the neck is suspected. 1
• Give 2 effective rescue breaths after ensuring head tilt and chin lift, pinching nose closed, and creating a good seal around the mouth—each breath should take 1.5-2 seconds and make the chest rise. 1

Pharmacological Management

Opioids for Refractory Breathlessness

• Low-dose opioids should be considered for relief of breathlessness, particularly when chronic breathlessness persists despite optimal treatment of underlying pathophysiology. 4, 2
• Oral low-dose sustained release morphine is licensed for chronic breathlessness due to COPD, heart failure, or cancer in Australia—start at 10 mg per day (2.5 mg immediate release four times daily, 5 mg modified release twice daily, or 10 mg modified release once daily). 4
• In dose increment studies, 63% of participants achieved clinically important improvement, with 67% of responders benefiting at 10 mg per day, 25% requiring escalation to 20 mg, and 8% requiring 30 mg per day. 4

Evidence Note: Data on opioids in heart failure are conflicting for short-term use but promising for longer-term use. 4 Most evidence for opioid efficacy comes from stable COPD populations. 4

Anxiety Management

• Treat anxiety which may contribute to the sensation of breathlessness. 2

Special Populations

Palliative Care Patients

• Oxygen therapy should be restricted to patients with SpO2 consistently <90% or those reporting significant relief from oxygen. 4, 2
• In non-hypoxemic patients, try opioids and non-pharmacological measures (including hand-held fan) before oxygen. 4, 2
• Oxygen therapy should not be continued in the absence of patient benefit or where disadvantages (discomfort of masks/cannulae, drying of mucous membranes) outweigh symptomatic benefit. 4
• In the last few days of life with comfort-focused care, there is no role for monitoring oxygen saturation—if the patient appears comfortable, oxygen levels are irrelevant. 4

Pregnant Patients

• For women >20 weeks pregnant with hypoxemia and reduced consciousness or requiring respiratory/cardiovascular support, manage with left lateral tilt or manual uterine displacement to improve cardiac output and oxygen delivery. 4
• Oxygen during labor is only required when there is maternal hypoxemia (SpO2 <94%)—routine supplemental oxygen during uncomplicated labor has weak evidence of fetal harm. 4

Monitoring and Reassessment

• Reassess frequently if breathlessness persists despite interventions. 1, 2
• Seek urgent medical advice if: patient appears to need increasing oxygen therapy, there is a rising National Early Warning Score (NEWS), or signs of respiratory deterioration are present. 1, 2
• For chronically hypoxemic patients with a clinical exacerbation associated with a ≥3% fall in oxygen saturation on their usual oxygen therapy, assess in hospital with blood gas estimations. 4
• Consider arterial blood gas if SpO2 ≤94% to warrant evaluation for severe hypoxemia, especially in active smokers where SpO2 overestimates oxygenation. 3