Respiratory Distress Management

Initial Assessment and Oxygen Therapy

For a patient with tachypnea, immediately assess for respiratory distress and provide supplemental oxygen to maintain SpO2 >94% (unless the patient is at risk for hypercapnic respiratory failure), while simultaneously investigating the underlying cause, as recommended by the British Thoracic Society 1
If hypoxemic (SpO2 <94%): Start with nasal cannulae at 2-6 L/min or simple face mask at 5-10 L/min, according to the British Thoracic Society 1
If at risk for hypercapnic respiratory failure (COPD, neuromuscular disease): Target SpO2 88-92%, as suggested by the British Thoracic Society 1
Administer supplemental oxygen to maintain SpO2 >94% (unless at risk for hypercapnia) and position patient in head-up/upright position 1, 2, 3

Assess for signs of respiratory distress, including accessory muscle use, paradoxical breathing, nasal flaring, fearful facial expression, and increasing respiratory rate (>50% from baseline), as indicated by the European Society of Intensive Care Medicine 4
Implement continuous pulse oximetry and use Early Warning Score (EWS) system alongside pulse oximetry, and assess for signs of airway compromise 1, 3

Consider High-Flow Nasal Cannula (HFNC) for hypoxemic respiratory failure, as recommended by the European Society of Intensive Care Medicine and the American Thoracic Society 5, 6
Consider Non-Invasive Ventilation (NIV) if there is persistent hypoxemia despite oxygen therapy, signs of increased work of breathing, or hypercapnia, according to the British Thoracic Society 7
For acute heart failure, administer oxygen with target saturation >94%, consider sublingual/IV nitrates and IV diuretics, and initiate non-invasive ventilation (CPAP) for respiratory distress 8

For COPD patients: Target SpO2 88-92% to prevent hypercapnic respiratory failure, as recommended by the British Thoracic Society 1
For patients with neuromuscular disease: Monitor closely for rapid deterioration and need for ventilatory support, as suggested by the American Thoracic Society and the British Thoracic Society 1, 9

Obtain arterial or arterialised capillary blood gases to assess oxygen level, carbon dioxide level, and acid-base status, and establish venous access and increase frequency of observations 1, 2, 8
Perform a 12-lead ECG during symptoms if possible to identify arrhythmia pattern, pre-excitation patterns suggesting accessory pathways, and document rate, regularity, and P wave morphology 10, 11
Blood tests, including complete blood count, basic metabolic panel, cardiac troponin, thyroid function tests, and glycemic status, are recommended to detect underlying conditions such as anemia, electrolyte imbalances, myocardial injury, thyroid dysfunction, and abnormal glucose levels, according to the European Society of Cardiology and the American College of Cardiology 12, 13, 14, 15

For pulmonary edema/congestion, position upright, administer oxygen, and consider diuretics 8
For anxiety/pain-induced tachypnea, provide appropriate analgesia and consider non-pharmacological measures 3
For ventricular tachycardia, amiodarone 150 mg IV over 10 minutes, followed by a maintenance infusion of 1 mg/min for 6 hours, is recommended 16, 17
The American College of Cardiology recommends initial management with vagal maneuvers, followed by adenosine 6 mg IV rapid bolus if no response, and if still no response, adenosine 12 mg IV rapid bolus (may repeat once) 14

Misattributing tachypnea to anxiety without adequate evaluation of cardiopulmonary causes should be avoided, as indicated by the American Thoracic Society 18
Focusing only on respiratory rate and missing other signs of respiratory distress should be avoided, as indicated by the American Thoracic Society 18
Administering high-concentration oxygen to patients with COPD or other conditions at risk for hypercapnic respiratory failure should be avoided, as recommended by the British Thoracic Society 1
Using AV nodal blockers in pre-excited atrial fibrillation can accelerate ventricular rate and cause ventricular fibrillation, and ignoring underlying causes can lead to recurrence of tachycardia 17