# A nurse is caring for a client with a newly created arteriovenous (AV) fistula in the left forearm for hemodialysis access. Which nursing intervention is most important to maintain the patency and function of the AV fistula?

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## 문제

A nurse is caring for a client with a newly created arteriovenous (AV) fistula in the left forearm for hemodialysis access. Which nursing intervention is most important to maintain the patency and function of the AV fistula?

## 보기

1. Apply warm compresses to the fistula site twice daily
2. Encourage the client to perform hand exercises with the affected arm
3. Monitor blood pressure in the arm with the AV fistula
4. Assess for the presence of a thrill and bruit at the fistula site **✔ 정답**

**정답: 4**

## 해설

Regular assessment of thrill and bruit is the priority to monitor AV fistula patency and detect early complications like thrombosis. Other interventions are supportive but less critical for immediate patency.

## 심화 해설

Understanding the Priority: Maintaining AV Fistula Patency

For a client with a newly created arteriovenous (AV) fistula, the immediate postoperative and long-term priority is to confirm that the access is functional. A fistula is a surgical connection of an artery directly to a vein, which allows the vein to become larger, thicker, and stronger under high arterial pressure—a process called maturation. The most direct and evidence-based method to verify that blood is flowing through this connection without clotting is to assess for a thrill (a palpable buzzing sensation felt over the site) and a bruit (an audible whooshing sound heard with a stethoscope). The absence of these findings is the earliest and most critical sign of thrombosis or loss of patency, which requires immediate intervention to attempt to salvage the access [1].

Why Other Interventions Are Not the Priority

While the other options represent components of care, they are not the most important initial or ongoing assessment for patency. Applying warm compresses is not a standard, evidence-based intervention for maintaining fistula patency and could theoretically cause burns or skin breakdown over the fragile site. Encouraging hand exercises is a valuable intervention to promote fistula maturation by increasing blood flow, and a structured exercise program can improve vessel dilation [2]. However, this is a secondary, long-term strategy for development, not the primary method for detecting an immediate, life-threatening complication like thrombosis. Monitoring blood pressure in the affected arm is a critical safety precaution that must be avoided to prevent vascular damage and clotting, making it a contraindicated action, not a recommended intervention.

The Clinical Rationale and Evidence Base

The assessment of thrill and bruit is the cornerstone of vascular access monitoring. The nursing role is central to this, as nurses are the primary clinicians performing frequent access assessments and cannulations. A multicenter study on hemodialysis nurses' knowledge and practices emphasizes that vascular access is the "lifeline" for patients, and a nurse's ability to perform a proper physical assessment, including checking for a thrill and bruit, is a fundamental competency for ensuring access functionality and patient safety [3]. This assessment must be performed at regular intervals, before every dialysis session, and any time a change in access function is suspected.

The consequences of a missed or delayed diagnosis of access thrombosis are significant. A clotted fistula often requires a thrombectomy or may lead to permanent access failure, necessitating the creation of a new access site. This aligns with the broader challenge in hemodialysis where preserving a complication-free AV fistula is a significant hurdle. Research investigating cannulation techniques highlights that the overarching goal is to improve AV fistula survival and lower complication rates, a process that begins with confirming the access is patent and ready for use [1]. Furthermore, studies analyzing cannulation failures show that clinical expertise and consistent adherence to assessment standards are essential for safe vascular access management, directly linking the nurse's assessment skills to the prevention of access-related complications [4]. The simple, non-invasive act of palpating for a thrill and auscultating for a bruit provides immediate, critical information about the patency of the surgically created connection, making it the most important nursing intervention to maintain the function of the newly created AV fistula [3].References (research sources)

- [1]A Randomized Control Trial of MuST for Vascular Access Cannulation in Hemodialysis Patients: Contributions for a Safe Nursing Intervention.RCT/clinical trialPeralta R, Rocha R, Dias AS, Martins A, Matos JF, Ponce P, Bernardo A, Wammi A, Stauss-Grabo M, Stuard S, Trkulja M, Carvalho H, Dias O, Cristóvão F. (2026) · DOI: 10.1016/j.xkme.2026.101305

- [2]The effect of arteriovenous fistula longevity preservation exercise program combined with video-assisted patient education on fistula maturation for maintenance hemodialysis patients.Research articleLuo S, Liu X, Lin Q, Zhong Z, Wu Y, Ye Y, Huang J, Lin J, Lin M. (2026) · DOI: 10.3389/fmed.2026.1788809

- [3]Knowledge, attitudes, practices, and self-efficacy of hemodialysis nurses in vascular access management: a multicenter cross-sectional survey in Anhui.Research articleZhao J, Luo J, Wang L, Peng M. (2026) · DOI: 10.1186/s12912-026-04376-7

- [4]Challenges in Hemodialysis: An Analytic Study of Nurses' Cannulation Failures.Research articleAlamoudi FA, Shahin MAH, Bayahya MA, Al Zuabi SM, Bakhurji RE, Aldarbi WA, Alfahd H. (2026) · DOI: 10.3390/healthcare14081077

## 임상 시나리오

AV Fistula Patency AssessmentPostoperative Monitoring for Hemodialysis Access
The priority nursing intervention is to assess for a thrill and bruit at the fistula site every 4 hours or per facility protocol. These findings directly confirm blood flow and patency.

The thrill is a continuous buzzing sensation best felt with the palm over the venous outflow tract. The bruit is a low-pitched, continuous sound heard during both systole and diastole.

CautionAbsence of a previously documented thrill or bruit is a medical emergency indicating possible thrombosis. Notify the provider immediately to attempt salvage within hours. Never take blood pressure, perform venipuncture, or place restrictive devices on the fistula arm.

## 핵심 개념

- **Thrill** — A palpable buzzing or vibrating sensation felt over a patent arteriovenous fistula, indicating turbulent blood flow.
- **Bruit** — An audible whooshing sound heard with a stethoscope over a patent arteriovenous fistula, indicating blood flow.
- **Arteriovenous (AV) Fistula** — A surgical connection of an artery directly to a vein, created to provide vascular access for hemodialysis.
- **Maturation** — The process by which the vein of an AV fistula enlarges and strengthens under arterial pressure to support repeated cannulation.

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