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Emergency And Acute Medicine – Respiratory Distress
Respiratory distress, shortness of breath, or dyspnea is a frequent and potentially life-threatening emergency department presentation. It represents a symptom rather than a diagnosis and may arise from airway, pulmonary, cardiac, neuromuscular, metabolic, toxic, traumatic, or psychogenic causes. Rapid identification of life-threatening conditions and early airway management are critical to prevent respiratory failure and cardiac arrest.
Etiologies include upper airway obstruction such as epiglottitis, croup, foreign body, angioedema, or retropharyngeal abscess. Cardiovascular causes include congestive heart failure with pulmonary edema, dysrhythmias, myocardial ischemia, pulmonary embolism, pericarditis, tamponade, and air embolism. Pulmonary causes include asthma, chronic obstructive pulmonary disease (COPD), pneumonia, influenza, bronchiolitis, aspiration, acute respiratory distress syndrome (ARDS), pleural effusion, toxic inhalation, and trauma such as pneumothorax or pulmonary contusion. Neuromuscular disorders such as Guillain–Barré syndrome or myasthenia gravis may impair ventilation. Metabolic and systemic causes include anaphylaxis, anemia, acidosis, sepsis, salicylate toxicity, stimulant overdose, and severe obesity. Anxiety and hyperventilation syndrome may mimic organic disease but should be diagnoses of exclusion.
Patients commonly present with tachypnea, dyspnea, tachycardia, anxiety, diaphoresis, cough, stridor, wheezing, crackles, increased work of breathing, accessory muscle use, hypoxemia, or cyanosis. Severe cases may show respiratory acidosis, altered mental status, lethargy, or obtundation. History should focus on prior lung or cardiac disease, recent infection, trauma, toxic exposure, chest pain, fever, or foreign-body aspiration. Intravenous drug use and indwelling catheters raise suspicion for septic emboli. Physical examination should assess mental status, work of breathing, jugular venous distention, heart sounds, lung sounds, chest wall movement, peripheral edema, and signs of trauma.
Initial evaluation includes pulse oximetry, cardiac and blood pressure monitoring, and electrocardiography when cardiac causes are suspected. Arterial blood gas may help determine severity and acid–base status. Laboratory studies may include CBC, metabolic panel, blood cultures if febrile, BNP for suspected heart failure, toxicology testing, and D-dimer or other evaluation for pulmonary embolism when appropriate. Chest radiography is often essential to identify pneumonia, pneumothorax, hyperinflation, pulmonary edema, or effusion. Bedside ultrasound can rapidly assess pneumothorax, pleural effusion, cardiac tamponade, right ventricular strain, or heart failure. CT angiography is indicated when pulmonary embolism is strongly suspected.
Prehospital management prioritizes airway positioning, high-flow oxygen, and assisted ventilation with bag-valve mask if needed. Needle decompression should be performed immediately if tension pneumothorax is suspected. In the emergency department, airway, breathing, and circulation are addressed first. Oxygen is administered, with caution in patients with chronic CO₂ retention. Intubation is indicated for severe respiratory distress, hypoxia refractory to oxygen, or altered mental status. Intravenous fluids are given for hypotension, and advanced cardiac life support protocols are followed for dysrhythmias or arrest.
Definitive treatment targets the underlying cause. Heart failure and pulmonary edema are managed with diuretics, nitrates, noninvasive positive-pressure ventilation, and vasodilators when hypertensive. Asthma and COPD exacerbations require bronchodilators, systemic corticosteroids, oxygen, and antibiotics if infection is suspected. Severe cases may require noninvasive ventilation or intubation. Pneumonia is treated with appropriate antibiotics and respiratory isolation when tuberculosis is suspected. Pneumothorax requires immediate decompression if tension is present, followed by tube thoracostomy. Anaphylaxis and angioedema require epinephrine, antihistamines, corticosteroids, and early airway protection. Epiglottitis requires urgent airway stabilization in a controlled setting and intravenous antibiotics. Pulmonary embolism requires anticoagulation and, in select cases, thrombolysis. Neuromuscular causes require ventilatory support and disease-specific therapy.
Patients require admission if they have persistent oxygen requirements, airway instability, hemodynamic compromise, significant comorbid conditions, or need for repeated treatments or monitoring. Discharge is appropriate only when the underlying cause has been addressed, oxygen is no longer required, and the airway is stable.
Early recognition, aggressive supportive care, and prompt treatment of the underlying etiology are essential. Immunocompromised states, emerging viral infections, and early administration of antibiotics in suspected bacterial pneumonia are important considerations. Respiratory distress can deteriorate rapidly, and continuous reassessment is vital to prevent progression to respiratory failure.
Respiratory distress, shortness of breath, or dyspnea is a frequent and potentially life-threatening emergency department presentation. It represents a symptom rather than a diagnosis and may arise from airway, pulmonary, cardiac, neuromuscular, metabolic, toxic, traumatic, or psychogenic causes. Rapid identification of life-threatening conditions and early airway management are critical to prevent respiratory failure and cardiac arrest.
Etiologies include upper airway obstruction such as epiglottitis, croup, foreign body, angioedema, or retropharyngeal abscess. Cardiovascular causes include congestive heart failure with pulmonary edema, dysrhythmias, myocardial ischemia, pulmonary embolism, pericarditis, tamponade, and air embolism. Pulmonary causes include asthma, chronic obstructive pulmonary disease (COPD), pneumonia, influenza, bronchiolitis, aspiration, acute respiratory distress syndrome (ARDS), pleural effusion, toxic inhalation, and trauma such as pneumothorax or pulmonary contusion. Neuromuscular disorders such as Guillain–Barré syndrome or myasthenia gravis may impair ventilation. Metabolic and systemic causes include anaphylaxis, anemia, acidosis, sepsis, salicylate toxicity, stimulant overdose, and severe obesity. Anxiety and hyperventilation syndrome may mimic organic disease but should be diagnoses of exclusion.
Patients commonly present with tachypnea, dyspnea, tachycardia, anxiety, diaphoresis, cough, stridor, wheezing, crackles, increased work of breathing, accessory muscle use, hypoxemia, or cyanosis. Severe cases may show respiratory acidosis, altered mental status, lethargy, or obtundation. History should focus on prior lung or cardiac disease, recent infection, trauma, toxic exposure, chest pain, fever, or foreign-body aspiration. Intravenous drug use and indwelling catheters raise suspicion for septic emboli. Physical examination should assess mental status, work of breathing, jugular venous distention, heart sounds, lung sounds, chest wall movement, peripheral edema, and signs of trauma.
Initial evaluation includes pulse oximetry, cardiac and blood pressure monitoring, and electrocardiography when cardiac causes are suspected. Arterial blood gas may help determine severity and acid–base status. Laboratory studies may include CBC, metabolic panel, blood cultures if febrile, BNP for suspected heart failure, toxicology testing, and D-dimer or other evaluation for pulmonary embolism when appropriate. Chest radiography is often essential to identify pneumonia, pneumothorax, hyperinflation, pulmonary edema, or effusion. Bedside ultrasound can rapidly assess pneumothorax, pleural effusion, cardiac tamponade, right ventricular strain, or heart failure. CT angiography is indicated when pulmonary embolism is strongly suspected.
Prehospital management prioritizes airway positioning, high-flow oxygen, and assisted ventilation with bag-valve mask if needed. Needle decompression should be performed immediately if tension pneumothorax is suspected. In the emergency department, airway, breathing, and circulation are addressed first. Oxygen is administered, with caution in patients with chronic CO₂ retention. Intubation is indicated for severe respiratory distress, hypoxia refractory to oxygen, or altered mental status. Intravenous fluids are given for hypotension, and advanced cardiac life support protocols are followed for dysrhythmias or arrest.
Definitive treatment targets the underlying cause. Heart failure and pulmonary edema are managed with diuretics, nitrates, noninvasive positive-pressure ventilation, and vasodilators when hypertensive. Asthma and COPD exacerbations require bronchodilators, systemic corticosteroids, oxygen, and antibiotics if infection is suspected. Severe cases may require noninvasive ventilation or intubation. Pneumonia is treated with appropriate antibiotics and respiratory isolation when tuberculosis is suspected. Pneumothorax requires immediate decompression if tension is present, followed by tube thoracostomy. Anaphylaxis and angioedema require epinephrine, antihistamines, corticosteroids, and early airway protection. Epiglottitis requires urgent airway stabilization in a controlled setting and intravenous antibiotics. Pulmonary embolism requires anticoagulation and, in select cases, thrombolysis. Neuromuscular causes require ventilatory support and disease-specific therapy.
Patients require admission if they have persistent oxygen requirements, airway instability, hemodynamic compromise, significant comorbid conditions, or need for repeated treatments or monitoring. Discharge is appropriate only when the underlying cause has been addressed, oxygen is no longer required, and the airway is stable.
Early recognition, aggressive supportive care, and prompt treatment of the underlying etiology are essential. Immunocompromised states, emerging viral infections, and early administration of antibiotics in suspected bacterial pneumonia are important considerations. Respiratory distress can deteriorate rapidly, and continuous reassessment is vital to prevent progression to respiratory failure.
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