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KembaraXtra-Medicine – Atelectasis
Atelectasis refers to the collapse of part or all of the lung, resulting in loss of lung volume. It is broadly classified into two major types. Obstructive atelectasis, the most common form, occurs when an airway is blocked, such as by a mucus plug, foreign body, or tumor, leading to resorption of air in the alveoli beyond the obstruction. Nonobstructive atelectasis occurs without airway blockage and may result from external compression (for example, pleural effusion), surfactant abnormalities, lung scarring, or reduced ventilation of part of the lung.
Atelectasis is frequently seen in postoperative patients, individuals with lung or chest wall injury, and those receiving mechanical ventilation. Dependent regions of the lung are particularly prone to collapse. Prior asbestos exposure is associated with a characteristic form known as rounded atelectasis. There is no clear racial or sex predilection.
Clinical presentation varies widely. Some patients are asymptomatic, while others develop cough, dyspnea, and hypoxemia. On physical examination, findings over the affected area may include decreased or absent breath sounds, dullness to percussion, reduced tactile fremitus, and diminished vocal resonance.
The causes of atelectasis are diverse and include airway obstruction (such as tumors, mucus plugs, or foreign bodies), extrinsic bronchial compression from masses or enlarged cardiac structures, pleural disease (including pleural effusion, pneumothorax, mesothelioma, or rounded atelectasis), and alveolar injury from aspiration, toxic inhalation, infection, or acute respiratory distress syndrome. Additional contributors include chest wall abnormalities, impaired respiratory mechanics due to pain or neuromuscular disease, and repetitive shear injury during positive-pressure ventilation.
The differential diagnosis includes bronchogenic carcinoma, pneumonia, pulmonary infarction, and pleural effusion. Diagnostic evaluation typically begins with a chest x-ray, which often suggests volume loss. Thoracic ultrasonography can help distinguish atelectasis from pleural effusion or consolidation. Chest CT scanning is useful when endobronchial obstruction or external compression is suspected, and prone positioning may help differentiate dependent atelectasis from true consolidation. Bronchoscopy is reserved for selected cases to evaluate or relieve airway obstruction.
Management focuses on re-expanding the lung and addressing the underlying cause. Nonpharmacologic measures include deep breathing exercises, early mobilization and ambulation, incentive spirometry, and airway clearance techniques such as positive expiratory pressure devices, cough-assist devices, and chest physiotherapy. In selected patients, tracheal suctioning or bronchoscopy may be required to remove mucus plugs or foreign bodies.
Acute management may include supplemental oxygen, positive-pressure ventilation (such as CPAP or PEEP), mucolytic therapy for mucus plugging, bronchodilators when indicated, and adequate pain control, especially in postoperative or trauma patients to allow effective ventilation. Large pleural effusions, hemothorax, or empyema should be drained when contributing to lung collapse.
Chronic management depends on the cause and may involve ongoing airway clearance therapies, treatment of underlying lung disease, debulking or stenting of obstructing endobronchial lesions, or removal of sources of external compression such as effusions or masses. Prognosis varies and is largely determined by the underlying etiology and the patient’s overall clinical condition.
Patients benefit from education emphasizing frequent position changes, sitting upright when possible, early mobilization, and adherence to breathing exercises. Referral to pulmonology or interventional pulmonology is appropriate when bronchoscopy, tumor management, or specialized airway interventions are required.
Atelectasis refers to the collapse of part or all of the lung, resulting in loss of lung volume. It is broadly classified into two major types. Obstructive atelectasis, the most common form, occurs when an airway is blocked, such as by a mucus plug, foreign body, or tumor, leading to resorption of air in the alveoli beyond the obstruction. Nonobstructive atelectasis occurs without airway blockage and may result from external compression (for example, pleural effusion), surfactant abnormalities, lung scarring, or reduced ventilation of part of the lung.
Atelectasis is frequently seen in postoperative patients, individuals with lung or chest wall injury, and those receiving mechanical ventilation. Dependent regions of the lung are particularly prone to collapse. Prior asbestos exposure is associated with a characteristic form known as rounded atelectasis. There is no clear racial or sex predilection.
Clinical presentation varies widely. Some patients are asymptomatic, while others develop cough, dyspnea, and hypoxemia. On physical examination, findings over the affected area may include decreased or absent breath sounds, dullness to percussion, reduced tactile fremitus, and diminished vocal resonance.
The causes of atelectasis are diverse and include airway obstruction (such as tumors, mucus plugs, or foreign bodies), extrinsic bronchial compression from masses or enlarged cardiac structures, pleural disease (including pleural effusion, pneumothorax, mesothelioma, or rounded atelectasis), and alveolar injury from aspiration, toxic inhalation, infection, or acute respiratory distress syndrome. Additional contributors include chest wall abnormalities, impaired respiratory mechanics due to pain or neuromuscular disease, and repetitive shear injury during positive-pressure ventilation.
The differential diagnosis includes bronchogenic carcinoma, pneumonia, pulmonary infarction, and pleural effusion. Diagnostic evaluation typically begins with a chest x-ray, which often suggests volume loss. Thoracic ultrasonography can help distinguish atelectasis from pleural effusion or consolidation. Chest CT scanning is useful when endobronchial obstruction or external compression is suspected, and prone positioning may help differentiate dependent atelectasis from true consolidation. Bronchoscopy is reserved for selected cases to evaluate or relieve airway obstruction.
Management focuses on re-expanding the lung and addressing the underlying cause. Nonpharmacologic measures include deep breathing exercises, early mobilization and ambulation, incentive spirometry, and airway clearance techniques such as positive expiratory pressure devices, cough-assist devices, and chest physiotherapy. In selected patients, tracheal suctioning or bronchoscopy may be required to remove mucus plugs or foreign bodies.
Acute management may include supplemental oxygen, positive-pressure ventilation (such as CPAP or PEEP), mucolytic therapy for mucus plugging, bronchodilators when indicated, and adequate pain control, especially in postoperative or trauma patients to allow effective ventilation. Large pleural effusions, hemothorax, or empyema should be drained when contributing to lung collapse.
Chronic management depends on the cause and may involve ongoing airway clearance therapies, treatment of underlying lung disease, debulking or stenting of obstructing endobronchial lesions, or removal of sources of external compression such as effusions or masses. Prognosis varies and is largely determined by the underlying etiology and the patient’s overall clinical condition.
Patients benefit from education emphasizing frequent position changes, sitting upright when possible, early mobilization, and adherence to breathing exercises. Referral to pulmonology or interventional pulmonology is appropriate when bronchoscopy, tumor management, or specialized airway interventions are required.
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