Low-Level Laser Therapy Versus Isometric Handgrip Exercise On Arteriovenous Fistula Maturation in Hemodialysis Patients

Hemodialysis remains a life-sustaining therapy for patients with end-stage renal disease, and the creation of a reliable arteriovenous fistula (AVF) is considered the gold standard for vascular access. However, despite its clinical advantages, AVF maturation failure occurs in up to 40% of patients, often due to inadequate vein dilation or early stenosis. Such shortcomings can delay dialysis initiation, increase the need for central venous catheters, and heighten the risk of infection and hospitalization. Interventions that can support or accelerate vascular remodeling and improve AVF usability, therefore, remain a significant focus in nephrology and vascular research.

Several strategies have been investigated to enhance AVF maturation, including surgical modifications, pharmacological therapies, and rehabilitative interventions. Among conservative methods, isometric handgrip exercise has shown promise by improving venous return, stimulating shear stress, and promoting dilation of the access vein. More recently, low-level laser therapy (LLLT) has gained attention for its ability to modulate endothelial function, stimulate nitric oxide release, and improve microcirculation, with preliminary evidence suggesting beneficial effects on vascular tone and tissue healing. Nevertheless, comparative data between exercise-based and photobiomodulation-based approaches remain limited.

This study is significant because it directly compares two non-invasive interventions-LLLT and isometric handgrip exercise-for their ability to enhance the vascular diameter of AVFs in hemodialysis patients. By clarifying whether photobiomodulation offers comparable or superior outcomes to exercise, the findings may help guide clinicians in selecting effective, patient-appropriate strategies to optimize AVF maturation and long-term patency. Ultimately, this research addresses a critical gap in vascular access management and may contribute to reducing access-related complications, improving dialysis efficiency, and enhancing the quality of life for patients dependent on chronic hemodialysis.

To our knowledge, this is the first randomized controlled trial to evaluate extravascular low-level laser therapy head-to-head with isometric handgrip exercise for promoting radiocephalic arteriovenous fistula maturation in patients with chronic kidney disease.

Inclusion criteria

• Patients of both genders.
• Patient age between 35 and 50 years.
• Diagnosed with chronic kidney disease (CKD) Stage 4 or 5 with a newly created radiocephalic arteriovenous fistula (RC-AVF), including both pre-dialysis patients and those temporarily receiving hemodialysis via central venous catheter pending fistula maturation.
• Distal forearm cephalic vein diameter ≥ 2.5 mm in the non-dominant hand

Exclusion criteria

• History of prior vascular access surgery on the same limb.
• Physical or mental disability limiting the ability to perform exercises.
• Positive Allen's test.
• Absent or thrombosed distal forearm cephalic vein.
• Already undergoing regular exercise (including manual workers).
• History of hemophilia or known coagulation disorder.
• Personal or family history of cancer.
• Severe cardiac disease (congestive heart failure with ejection fraction ≤ 20%).
• Known central venous stenosis > 50% on the side of planned arteriovenous fistula creation.