- Placing a catheter through the trachea or larynx (entry point at the cricothyroid ligament) allows collection of diagnostic samples from the lower respiratory tract.
- To collect samples for cytological examination [Bronchial tracheal wash: cytology].
- To collect samples for microbiology.
- Simple procedure.
- Does not require general anesthesia in some cases therefore avoids risk of anesthesia in animals with respiratory compromise.
- Avoids oropharyngeal sample contamination.
Oxygen may be administered by facemask during procedure in severely compromised animals.
- Sampling is usually blind. Material can be sampled more accurately with endoscopic guidance and this gives better results than blind sampling.
- More risk of sample contamination from upper respiratory tract, ie trachea, than with bronchoalveolar lavage (BAL).
- Long flexible intravenous catheter through the needle (14-16 gauge).
Premeasure catheter from point of insertion to position of carina before insertion.
- 5 ml syringe.
- Sample collection tubes.
- Local anesthetic.
- Scalpel blade.
- 10 minutes.
Reasons for treatment failure
- Little or no material may be retrieved despite multiple flushings.