Difficulty Breathing: Clinical Approach and Management

Anatomical and Physiological Framework

Upper airway patency depends on pharyngeal muscle tone, tongue position, and laryngeal structures—obstruction here causes inspiratory stridor and suprasternal retractions, as noted by the British Journal of Anaesthesia 1, 2
Chest wall compliance and respiratory muscle strength determine ventilatory capacity—neuromuscular weakness or chest wall restriction leads to shallow, rapid breathing, according to Circulation 3

Immediately assess for life-threatening airway compromise, inadequate ventilation, or circulatory collapse using the ABCDE approach before pursuing detailed differential diagnosis, as recommended by the American Heart Association, published in Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4
Unilateral absent breath sounds with hemodynamic instability mandates immediate consideration of tension pneumothorax requiring needle decompression before imaging, as suggested by the American College of Surgeons, published in Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4
Oxygen saturation below 90% despite supplemental oxygen suggests severe gas exchange impairment or shunt physiology, according to the American Thoracic Society, published in Circulation 3 and Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4

Pneumothorax progression to tension physiology occurs when one-way valve mechanism increases intrapleural pressure, compressing mediastinal structures and impairing venous return, as described by the American College of Chest Physicians, published in Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4
Laryngeal edema develops progressively with repeated intubation attempts or airway manipulation, potentially converting "can intubate" to "can't intubate, can't ventilate" scenario, as noted by the British Journal of Anaesthesia 1
Post-extubation stridor occurs in 12-37% of mechanically ventilated patients due to laryngeal edema, according to the British Journal of Anaesthesia 2, 5

If unresponsive with no breathing or only gasping: Begin CPR immediately with 30 compressions:2 ventilations, minimize interruptions, as recommended by the American Heart Association, published in Circulation 3 and Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4
If unilateral absent breath sounds with instability: Perform needle decompression for presumed tension pneumothorax without waiting for imaging, as suggested by the American College of Surgeons, published in Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4
For patients with pulse but inadequate breathing: Provide rescue breaths at 1 breath every 5-6 seconds (10-12/minute) with visible chest rise, according to the American Heart Association, published in Circulation 3 and Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4

Delaying needle decompression in unstable patients to obtain imaging when tension pneumothorax is clinically suspected—clinical diagnosis is sufficient for life-saving intervention, as emphasized by the American College of Surgeons, published in Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4
Multiple repeated intubation attempts cause progressive laryngeal edema and hemorrhage, potentially losing ability to mask ventilate—limit to 2-3 attempts before calling for help, as recommended by the British Journal of Anaesthesia 1 and Anaesthesia 7
Excessive ventilation during CPR (too many breaths or too large volume) impairs venous return and worsens outcomes, according to the American Heart Association, published in Circulation 3 and Praxis Medical Insights: Practical Summaries of Clinical Guidelines 4