Diminished breath sounds

Introduction The breath sounds are mainly alveolar breath sounds, and the weakening or disappearance of alveolar breath sounds is associated with a decrease in air flow in the alveoli or a decrease in air flow velocity into the lungs and a disturbance in respiratory sound transmission. It can occur locally, unilaterally or in both lungs.

Cause

Common causes are a decrease in alveolar breath sound transmission, a limitation in thoracic or pulmonary dilatation, or a decrease in ventilation or a decrease in alveolar gas flow and flow rate due to insufficient respiratory motility and increased resistance.

an examination

1. Limited thoracic activity, such as chest pain, rib bone softening, rib resection, pleural hypertrophy, etc.

2. Respiratory muscle diseases, such as myasthenia gravis, phlegm, phlegm and so on.

3. Airway obstruction, such as chronic bronchitis, bronchial asthma and so on.

4. Compression atelectasis, common in pleural effusion, pneumothorax, massive abdominal ascites or huge tumors.

Differential diagnosis

Low breath sound: more common in acute tracheal-bronchitis, acute tracheal-bronchitis is a common disease, acute inflammation of the tracheal-bronchial mucosa caused by a variety of reasons. The prognosis is good, and the mucosal structure can be completely restored to normal after treatment. The incidence rate is higher in winter. Roughness of breath sound: Rough breath sounds are abnormal breath sounds, due to mild edema or inflammatory infiltration of the bronchial mucosa, resulting in uneven or narrow wall of the tube, resulting in poor airflow. Found in the early stages of bronchial and pulmonary inflammation. Tube-like breath sound: Also known as abnormal bronchial breath sound, refers to hearing bronchial breath sounds in the normal alveolar respiratory sound distribution area.

1. Lung tissue consolidation, seen in the pneumonia consolidation period.

2. Large cavity in the lung, found in lung abscess or hollow tuberculosis.

3. Closed atelectasis, when the pleural effusion is more than moderate, a weak and distant bronchial breath sound can be heard above the effusion zone.

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