Victoria Socha

DocwireNews

Kidney Week 2020Among patients receiving hemodialysis using arteriovenous fistulas (AVF), hemodynamically relevant stenosis in the AVF are associated with a reduction in access flow rate. Lin-Chun Wang, MS, and colleagues conducted a study to test the hypothesis that the changes in blood flow patterns may be detectable in video recordings done with commercially available smartphones.Results of the study were reported during a virtual poster session at ASN Kidney Week 2020. The <a href="https://www.asn-online.org/education/kidneyweek/2020/program-abstract.aspx?controlId=3446347">poster</a> was titled Assessment of Arteriovenous Fistula Dysfunction with Access Stenosis in Hemodialysis Patients Using Smartphone Videos.The study cohort included patients on hemodialysis with <a href="https://www.docwirenews.com/docwire-pick/nephrology-picks/ultrasound-cannulation-hemodialysis/">AVF</a> dysfunction requiring balloon angioplasty. One-minute video recordings of the skin above the AVF and access flow rate measurements were performed using an iPhone 6S prior to and following the intervention. Access flow rate was measured by HVT100 Transonic flowmeter. Angiography was used to assess the degree of stenosis.Frame-to-frame pixel changes in video images were amplified; time-domain data were transformed into the frequency-domain signals. Per each 1-minute video, 50 random 10-second segments were sampled; the researchers determined the frequency with the lowest magnitude in each sample. The average frequency magnitude was examined for its association with the degree of stenosis.The study cohort included 90 hemodialysis patients. Of those, mean age was 63 years and mean hemodialysis vintage was 4.1 years. Post-intervention access flow rate (1638 mL/min) was, on average, 1.23-fold higher than preintervention access flow rate (1373 mL/min), P&lt;.01, paired t-test).Participants were categorized by degree of stenosis. There was an association between higher degree of stenosis and increase in access flow rate from before to after the intervention. The degree of AVF stenosis was also positively related to the change in frequency magnitude from before to after the intervention.In conclusion, the researchers said, &ldquo;Smartphone video recordings of AVF appear to contain frequency-domain information that correlates with hemodynamic changes caused by AVF stenoses. While the frequency magnitude metric employed in our analysis is not ideal, these results should encourage the quest for other parameters that exhibit higher correlations with vascular access dysfunction, allowing timely referrals and avoidance of emergency interventions.&rdquo;Source: Wang L-C, Zhu F, Thwin O, et al. Assessment of arteriovenous fistula dysfunction with access stenosis in hemodialysis patients using smartphone videos. Abstract of a poster presented at the American Society of Nephrology virtual Kidney Week 2020 (PO1344), October 22, 2020.

Jordana Jampel

Positive Preliminary Results From Phase 1 Trial of Dopaminergic Neuron Graft for Parkinson’s Disease

Dementia

Bradley Warady, MD

Joel M. Topf, MD, FACP

2025 Hume Award Winner Is Dedicated to Children’s Care

NKF Spring Clinical Meetings 2025

Distant Brain Metastases in Cutaneous Melanoma May Be Mitigated With Multiple Pathway Inhibitors

Melanoma

Latest News

Assessing AVF Dysfunction with Access Stenosis Using Smartphone Videos

Nephrology Times

About Us

Editorial Policy

Advertising

Contact Us

eNewsletters

Contribute

Career Center

MashupMD

Blood Cancers Today

Cancer Nursing Today

GU Oncology Now

Urban Health Today

Bile Duct Cancer

Colorectal Cancer

Gastroesophageal Cancer

Gastric Cancer

GEP-NETs

GIST

Liver Cancer

Pancreatic Cancer

GI Oncology Now

Anemia

Deep Vein Thrombosis

Essential Thrombocythemia

Hemophilia

Immune Thrombocytopenic Purpura

Myelodysplastic Syndromes

Myelofibrosis

Myeloproliferative Neoplasms

Polycythemia Vera

Pulmonary Embolism

Sickle Cell Disease

Thrombocytopenia

Thrombophilia

Thrombosis

Thrombotic Thrombocytopenic Purpura

Venous Thromboembolism

von Willebrand Disease

Heme Today

Acute Kidney Injury

ADPKD

Anemia and Kidney Disease

Chronic Kidney Disease

COVID-19 and Kidney Disease

Diabetes and Hypertension

End-Stage Renal Disease

Gout

Hyperkalemia

IgAN

Kidney Transplantation

Metabolic Acidosis

HER2 Breast Cancer

HR Breast Cancer

Triple-Negative Breast Cancer

Genetics & Breast Cancer

Breast Cancers Today

Atherosclerotic Disease

Atrial Fibrillation

Heart Failure

Hypertension

Interventional Cardiology

Lipid Management

Practice Tips With Dr. Lichaa

Preventive Cardiology

Stroke

Cardiology

Breast Cancer

Gynecologic Cancer

Head and Neck Cancer

Skin Cancer

Oncology

Sleep

Urology

Diabetes

Ophthalmology

— Demodex Blepharitis

Neurology

Rheumatology

Gastroenterology

Pulmonology

Infectious Diseases

— HIV

Health and Wellness

Lupus

Future of Medicine

Orthopedics

Pharmacology

Career News

More

Conferences

CardioNerds

The Sleep Source With Dr. Morse

Rheumatology Rounds With Dr. Maheswaranathan

Partners

Expert Interviews

Subscribe