Selecting a suction catheter with multiple holes, known as ‘eyes,’ at the tip is one of the keys to controlling the pressure. Studies show that suction catheters with two holes are better at distributing pressure and reducing trauma during the procedure. 
Another important consideration for safer suction catheter use is the amount of negative pressure employed. Clinicians must strike a balance between removing the secretions and limiting trauma to the airways. For this reason, suction pressure should be set as low as is reasonably possible to remove the secretions.
The amount of pressure required by a patient depends on a range of factors, including:
- The secretions
- Clinical condition
It is, however, generally recommended that suction pressure not exceed 200 mmHg for adults.