The best way to check the patency of arteriovenous fistula for hemodialysis?& x20; - AIIMS Bhatinda NO - 2019

AIIMS Bhatinda NO - 2019

Medical Surgical Nursing

Easy

Appeared in: AIIMS Bhatinda NO - 2019

Explanation

The standard, non-invasive method to assess the patency of an AV fistula is to palpate for a 'thrill'.
A thrill is a palpable vibration or buzzing sensation felt over the fistula, which indicates high-velocity, turbulent blood flow from the artery to the vein.
The presence of a continuous thrill is a primary sign that the fistula is open and functioning correctly, which is essential for successful hemodialysis.
This assessment is often paired with auscultating for a 'bruit,' a swishing sound heard with a stethoscope, which also confirms patency.

Option A: Pinching the fistula is not a standard assessment method and can cause trauma to the vessel walls, potentially leading to clotting (thrombosis) and loss of the access site.
Option B: Using a needle to aspirate blood is an invasive procedure that carries a significant risk of infection, bleeding, and damage to the fistula. It is not used for routine patency checks.
Option C: Checking capillary refill assesses the adequacy of blood flow to the distal parts of the limb (the hand and fingers), not the patency of the fistula itself.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Assessment of Arteriovenous (AV) Fistula Patency as background academic context rather than a clinical decision trigger.
Regularly assessing for a thrill and bruit (at least once per shift in a hospital setting and daily by the patient at home) is a critical nursing responsibility to ensure the fistula remains patent for life-saving dialysis treatment.
The absence of a thrill or bruit is considered a medical emergency. It indicates a clotted or failing fistula that must be reported to the physician or nephrology team immediately, as urgent intervention may be required to salvage the access.
What if? If the thrill feels weaker than usual or is absent, the nurse must not attempt to use the fistula and should immediately notify the primary healthcare provider. The fistula may be clotting, and prompt action (such as a thrombectomy or angioplasty) might save the access site.

How to Approach the Question

First, identify the core of the question: it asks for the 'best way' to check AV fistula 'patency'. This implies a standard, safe, and direct assessment.
Recall the two hallmark signs of a patent AV fistula: a palpable 'thrill' and an audible 'bruit'. These are caused by the turbulent flow of blood.
Evaluate each option for safety and relevance. Eliminate options that are harmful (pinching) or unnecessarily invasive for a routine check (needle aspiration).
Differentiate between assessing the fistula directly and assessing for complications. Checking capillary refill assesses distal circulation (a related but separate assessment), not the flow within the fistula itself.
Select the option that describes the direct, non-invasive, and standard method for feeling the blood flow within the fistula, which is palpating for a thrill.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 p. 308-310