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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.

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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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