Causes and Solutions of the Trampoline Effect

Area of Science:

• Nephrology
• Vascular Access
• Hemodialysis

Background:

• The trampoline effect is a complication during hemodialysis needle insertion into arteriovenous fistulas (AVFs).
• It occurs when the buttonhole tract and vessel flap are not aligned or the flap is too small.

Purpose of the Study:

• To investigate the causes and potential mitigation strategies for the trampoline effect during AVF cannulation.
• To explore the relationship between puncture technique, vessel flap size, and trampoline effect incidence.

Main Methods:

• Analysis of factors influencing trampoline effect frequency, including single vs. multiple punctures.
• Evaluation of needle type (sharp vs. dull) and insertion direction on vessel flap manipulation.
• Observation of trampoline effect incidence with prolonged buttonhole tract use.

Main Results:

• Multiple punctures of the AVF vessel, compared to single punctures, resulted in a lower frequency of the trampoline effect.
• Prolonged use of a buttonhole tract increased trampoline effect frequency.
• Using a dull needle with sharp edges for single buttonhole cannulation to enlarge the vessel flap reduced the trampoline effect.
• Reverse direction insertion of a dull needle into the vessel flap was smoother than conventional insertion.

Conclusions:

• The trampoline effect is linked to vessel flap integrity and alignment, potentially exacerbated by repeated trauma or diminishing flap size.
• Techniques like multiple punctures or specific dull needle cannulation may reduce trampoline effect incidence.
• Reverse direction insertion of dull needles offers a potentially viable clinical approach.