CCHT - Certified Clinical Hemodialysis Technician Vascular Access and Cannulation 1

Question 1

What is the recommended angle of needle insertion when cannulating a mature arteriovenous fistula?

Accepted Answer

25–35 degrees

Answer

5–10 degrees

Answer

45–60 degrees

Answer

90 degrees perpendicular to the skin

Question 2

Which of the following is the earliest and most reliable sign of needle infiltration during a hemodialysis treatment?

Accepted Answer

Localized swelling and pain at the needle insertion site

Answer

A sudden drop in the venous pressure alarm

Answer

Blood appearing in the arterial drip chamber

Answer

An increase in the arterial pressure alarm above baseline

Question 3

What is the minimum recommended distance between the arterial and venous needles during AV fistula cannulation to minimize recirculation?

Accepted Answer

5 cm

Answer

1 cm

Answer

2 cm

Answer

10 cm

Question 4

According to the 'Rule of 6s,' which set of criteria indicates that an AV fistula is mature and ready for cannulation?

Accepted Answer

Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks

Answer

Flow >400 mL/min, diameter ≥4 mm, depth ≤8 mm, maturation ≥4 weeks

Answer

Flow >500 mL/min, diameter ≥5 mm, depth ≤5 mm, maturation ≥5 weeks

Answer

Flow >800 mL/min, diameter ≥8 mm, depth ≤4 mm, maturation ≥8 weeks

Question 5

Which type of hemodialysis vascular access carries the highest risk of bloodstream infection?

Accepted Answer

Tunneled cuffed central venous catheter

Answer

Native arteriovenous fistula

Answer

Synthetic arteriovenous graft

Answer

Subcutaneous port-catheter device

Question 6

In a non-urgent clinical situation, how long should a technician typically wait before cannulating a newly placed synthetic AV graft?

Accepted Answer

2–4 weeks

Answer

24–48 hours

Answer

3–5 days

Answer

3–6 months