Complications of Specific Procedures and Surgery

Complications of Lumbar Puncture and Thoracentesis

Invasive needle procedures require strict pre-procedure screening and vigilant post-procedure surveillance to protect patient safety. A lumbar puncture involves inserting a needle into the subarachnoid space to obtain cerebrospinal fluid. Performing a lumbar puncture is contraindicated when increased intracranial pressure is associated with an intracranial mass lesion or other risk of cerebral herniation, as the sudden shift in pressure can cause catastrophic brainstem compression. Additionally, coagulopathy and severe thrombocytopenia represent firm contraindications because uncorrected bleeding risks can lead to a spinal epidural hematoma. A hematoma after a lumbar puncture can compress the cauda equina nerve roots, causing lower-extremity weakness, sensory deficits, and new bowel or bladder dysfunction.

The most common complication following a lumbar puncture is a post-dural puncture headache. This headache has a hallmark postural character: it typically worsens when the patient is upright and improves when the patient is lying flat. While lying flat provides temporary symptomatic relief, nurses must recognize that routine bed rest and increased oral fluids have not been shown to prevent this complication. If a persistent cerebrospinal fluid leak continues to cause a debilitating post-dural puncture headache, an epidural blood patch serves as an effective therapeutic intervention to seal the dural defect. Post-procedure monitoring also includes inspecting the puncture site; clear drainage from the lumbar puncture site may indicate an ongoing cerebrospinal fluid leak and requires prompt provider notification. Fever, nuchal rigidity, and photophobia after lumbar puncture raise concern for meningitis and demand urgent evaluation; these findings do not establish that the procedure caused it.

Thoracentesis, which removes fluid from the pleural space, carries its own set of acute risks. Pneumothorax is a significant complication that occurs if the needle inadvertently punctures the underlying lung tissue. Nurses should watch for sudden dyspnea, tachypnea, tachycardia, and diminished breath sounds on the affected side. A tension pneumothorax can cause rapidly worsening respiratory distress and hypotension; tracheal deviation away from the affected side is a possible late sign and must not be awaited. Subcutaneous emphysema may also arise around the insertion site, presenting as a distinctive crackling sensation or crepitus upon palpation. While a chest X-ray may be ordered whenever a pneumothorax is suspected, it is not routinely required after an uncomplicated ultrasound-guided thoracentesis.

Procedure technique and fluid dynamics dictate other major thoracentesis outcomes. Accidental puncture of the liver or spleen can occur if the provider inserts the needle below the recommended intercostal space. Re-expansion pulmonary edema is a rare complication of pleural drainage associated with factors including excessive negative pleural pressure; neither drainage rate nor a fixed 1- to 1.5-liter threshold reliably predicts it. Patients with re-expansion pulmonary edema may develop cough, dyspnea, tachypnea, and hypoxemia; pink frothy sputum can occur in severe cases. Throughout and following the procedure, the nurse must monitor vital signs closely; acute hypotension and diaphoresis may signal a vasovagal reaction, internal bleeding, or large-volume fluid shifts.