Patients with chronic kidney failure who require hemodialysis depend on a surgically created connection between an artery and a vein in the arm, known as an arteriovenous fistula. This connection allows blood to flow at a high enough rate for effective hemodialysis treatment. However, many arteriovenous fistulas do not enlarge or strengthen adequately after surgery, a process known as maturation. When maturation fails, the fistula may not provide enough blood flow, leading to delays in hemodialysis, repeated procedures, or the need for temporary catheters. Improving the maturation of arteriovenous fistulas is therefore essential for patient safety, comfort, and the long-term success of hemodialysis. Isometric hand-grip exercises, such as repeatedly squeezing a hand-held dynamometer, may help increase blood flow to the arm and stimulate the blood vessels that are part of the fistula. These exercises require the muscles to contract without changing length, which can encourage enlargement of the vein and the development of new small blood vessels in the forearm. Previous research suggests that improving hand-grip strength may support better vein remodeling and improved blood flow, both of which are important for fistula maturation. This study is designed to evaluate whether performing a structured program of isometric hand-grip exercises using a dynamometer can enhance the maturation and long-term openness (patency) of arteriovenous fistulas in adults receiving hemodialysis. Participants are randomly assigned to one of two groups: a control group that receives routine postoperative care, and an exercise group that performs hand-grip exercises for six weeks. All participants undergo ultrasound imaging of the fistula before starting the study and again after six weeks. The ultrasound measurements include fistula size, vein diameter, blood flow, and blood flow velocity. The goal of this study is to determine whether a simple, low-cost exercise intervention can help arteriovenous fistulas mature more successfully and reduce the need for additional procedures.
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Change in arteriovenous fistula blood flow volume measured by Doppler ultrasound
Timeframe: Baseline and six weeks after starting the hand-grip exercise program or standard care