Infusion Hydrothorax – Causes, Symptoms and Treatment
An infusion hydrothorax is a rare but serious complication in which intravenous fluid accidentally accumulates in the pleural space instead of entering the bloodstream.
Things worth knowing about "Infusion Hydrothorax"
An infusion hydrothorax is a rare but serious complication in which intravenous fluid accidentally accumulates in the pleural space instead of entering the bloodstream.
What Is an Infusion Hydrothorax?
An infusion hydrothorax (also referred to as infusiothorax) is a rare but potentially life-threatening complication of intravenous therapy. It occurs when infusion fluid inadvertently enters the pleural space – the narrow cavity between the lung and the chest wall – rather than flowing into the bloodstream as intended. The resulting fluid accumulation is known as a pleural effusion and can significantly impair respiratory function.
Causes
The most common cause of an infusion hydrothorax is malposition of a central venous catheter (CVC). Central venous catheters are inserted through large veins such as the subclavian vein or the internal jugular vein. If the catheter is incorrectly placed or perforates the vessel wall, infusion fluid can leak into the pleural cavity.
- Catheter malposition: Incorrect placement of the CVC outside the vein
- Venous perforation: Injury to the vessel wall by the catheter tip
- Catheter migration: Displacement of an initially correctly positioned catheter over time
- Peripheral catheters: Rarely caused by peripheral intravenous lines, particularly in premature and newborn infants
Symptoms
Clinical signs of an infusion hydrothorax can vary depending on the severity and rate of fluid accumulation. Typical symptoms include:
- Shortness of breath (dyspnoea) – often the first and most prominent symptom
- Cough and chest tightness
- Diminished or absent breath sounds on the affected side
- Tachycardia (rapid heart rate)
- Decreased oxygen saturation
- In severe cases: cyanosis (bluish discolouration of the lips and skin) and signs of shock
Diagnosis
Diagnosis is clinically suspected and confirmed through imaging studies:
- Chest X-ray: Reveals a unilateral pleural effusion, often in combination with visible catheter malposition
- Ultrasound: Rapid bedside detection of pleural fluid accumulation
- CT scan of the thorax: Precise visualisation in ambiguous cases
- Pleural fluid analysis: The glucose concentration of the aspirated fluid matches that of the infusion solution – a key diagnostic indicator
Treatment
Treatment depends on the severity of the effusion and the clinical condition of the patient:
- Immediate cessation of the infusion and removal or correction of the malpositioned catheter
- Thoracocentesis (pleural puncture): Drainage of accumulated fluid via needle or drainage tube
- Chest tube insertion: Required for large effusions or haemodynamic instability
- Supplemental oxygen and supportive measures to stabilise respiratory function
- Close monitoring in an intensive care unit in severe cases
Prevention
Prevention of an infusion hydrothorax begins with careful technique during catheter insertion and routine verification of catheter position following CVC placement. Key preventive measures include:
- Radiological or ultrasound-guided confirmation of catheter position after insertion
- Regular clinical monitoring for signs of catheter malposition
- Minimising excessive mechanical stress on the catheter
- Adequate training and experience of medical staff in central venous access procedures
References
- Pikwer A, Akeson J, Lindgren S. Complications associated with peripheral or central routes for central venous cannulation. Anaesthesia. 2012;67(1):65–71. PubMed PMID: 22098171.
- McGee DC, Gould MK. Preventing complications of central venous catheterization. New England Journal of Medicine. 2003;348(12):1123–1133.
- Stather DR, MacEachern P, Chee A, et al. Pleural complications of central venous catheter placement. Respirology. 2013;18(5):825–832.
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