A cannula is an invasive device that creates a portal of entry into the blood stream and must never be inserted “just in case”, nor should they be inserted for taking bloods.
It is essential that there is a defined, justified clinical reason for the insertion and continued presence of a PVC.
There are a number of reasons why peripheral venous cannulation may be required. The following lists potential indications, but is not exhaustive:
- Therapeutic – to administer IV drugs, fluids, blood products etc
- Diagnostic – to administer radio-opaque dye for scanning purposes
- Emergency access – to obtain access in patients who have the potential to become more unwell.
PVCs should be inserted when the anticipated duration of IV therapies is short. If the duration of treatment is anticipated to be long term, alternative intravenous access devices should be considered.
Factors such as past medical history, age and medications can cause some individuals to have poor venous access. If an individual is known to have poor venous access, seek help early.
Avoid more than 3 attempts at insertion with a patient.
A PVC is a single use device and must never be used more than once. After a failed attempt a new cannula must be used for any subsequent attempts.
The need for a PVC must be reviewed at least daily.
A PVC must be removed when clinically indicated or when no longer required. A PVC must be removed if the patient develops signs or symptoms of complication such as inflammation or infection.
Choice of device
The information gathered from the patient assessment will determine which cannula should be used.
The cannula should:
- permit optimal flow rates
- cause minimum patient discomfort
- be easy to insert
- give high, consistent and reliable performance
- have an integrated free port to provide needle-free access
- be a “safer sharps” design unless there are documented reasons as to why a non-safer device is chosen.