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...Intravenous iv cannulation is a technique in which cannula placed inside vein to provide venous access allows sampling of blood as well administration fluids medications parenteral nutrition chemotherapy and products cannulae parts types colour gauge estimates uses flow rate ml min paediatrics neonates elderly patients suitable for slow speed infusions the most commonly used analgesia non emergent transfusions trauma surgery transfu sions dyes con trast studies rapid transfusion whole or components large volume replacement sites figure below veins fore arms basilic cephalic median cubital b hands metacarpal dorsal arch general rules selecting an site start distal area before going proximally use upper extremities rather than lower avoid areas flexion largest longest straightest palpable indications repeated drugs nutritional support contraindications injured infected swelled burned extremity that have arteriovenous fistula arm on side mastectomy complications complication causes sigs s...