Diagnostic taps usually require the use of small caliber needles or cannulas, whereas therapeutic taps require larger caliber cannulas or catheters for removal of larger volumes.
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Take this into account when performing therapeutic taps. Do not remove too much pleural fluid, ensuring you stop as soon as the patient starts complaining of chest discomfort which may suggest high negative pleural pressure.
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- Unwell patients
- Liver failure
- Anticoagulant therapy
- Nutritional deficiency
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Fluid shifts around significantly with changing positions.
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21g or 23g needle or
20g or 22g cannula
You will know from your seeker needle whether the fluid is serous (small needle is ok) or turbid (larger needle will be required)
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