05/09/2025
Mastering the Art of Cannulation
Many health professionals find cannulation challenging, especially in children and patients with oedema. Multiple failed attempts in front of a patient or relative can be discouraging and may even lead to loss of trust. Some shy away and delegate, thinking cannulation is difficult—yet with the right technique, it’s one of the simplest procedures.
So, what makes cannulation easy?
✅ Step 1: Assess the patient’s condition (young, elderly, oedematous, etc.)
✅ Step 2: Examine the veins (big, small, straight, or branched)
✅ Step 3: Select the right cannula size according to steps 1 & 2
Once that’s done, follow these key steps:
1. Select a suitable vein
2. Pull the skin taut to anchor it
3. Insert at a low angle (5–15°)
4. Once you see “flashback,” drop to 0–5°
5. Advance the plastic cannula and remove the needle safely
6. Secure and dress the site with zinc oxide but not round & tight if so make it lose
💡 Pro tips:
The larger the size number of the cannula the smaller the Gauge size and the smaller the Gauge size the bigger the size of the cannula
Women’s veins are often slippery—adjust your angle to prevent movement
Use larger bore cannulas in emergencies for rapid infusion
Start with the forearm before the arm to preserve options
Apply warm compression if veins aren’t visible
Consider ultrasound-guided cannulation if trained
Remember—our priority is serving patients. Sometimes this means cannulating in more painful but necessary areas like the palm, fingers, or lower forearm.
Try these steps and you’ll see the difference.
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Renard
