Rapid Breathing in Pleural Effusion: Clinical Significance

Pathophysiological Mechanism

The European Respiratory Society suggests that rapid breathing in pleural effusion occurs as a compensatory response to maintain minute ventilation when tidal volumes are compromised by fluid accumulation in the pleural space 1
The American Thoracic Society indicates that decreased chest wall compliance from fluid accumulation forces the respiratory system to work harder, contributing to rapid breathing 1
Rapid breathing is also caused by mediastinal shift and ipsilateral diaphragm depression, reducing effective lung volume 1
The British Thoracic Society notes that neurogenic reflex stimulation from the lungs and chest wall triggered by the effusion contributes to rapid breathing 2

The American College of Chest Physicians recommends that dyspnea, the most common presenting symptom in pleural effusion, be evaluated immediately, with the degree of breathlessness dependent on both the volume of effusion and the underlying condition of the lungs and pleura 3, 1
The presence of rapid breathing should prompt immediate evaluation, as tachypnea severity correlates with effusion size, with moderate to large effusions typically producing clearly detectable respiratory changes 2
Small effusions may have subtle or no respiratory rate changes, requiring imaging for detection 2
Up to 25% of patients with pleural effusion may be asymptomatic at presentation, found incidentally 1

The American Thoracic Society suggests performing therapeutic thoracentesis to determine its effect on breathlessness and rate of recurrence 3, 4
The European Respiratory Society recommends limiting fluid removal to 1-1.5 L on a single occasion to avoid re-expansion pulmonary edema 4, 1
The British Thoracic Society notes that complete lung expansion should be confirmed after drainage before attempting pleurodesis 3
If contralateral mediastinal shift is not observed with a large effusion, suspect endobronchial obstruction or trapped lung 3

The Infectious Diseases Society of America recommends that frankly purulent or turbid/cloudy pleural fluid requires prompt chest tube drainage 5
Pleural fluid pH <7.2 indicates chest tube drainage is required 5
Poor clinical progress during treatment with antibiotics alone should lead to prompt chest tube drainage 5