Single versus Double Injection Techniques in Supraclavicular Brachial Plexus Block and the Role of Perfusion Index: A Narrative Review. JATI [Internet]. 2026 Apr. 5 [cited 2026 Aug. 17];2(1):25-32. Available from: https://ejournal4.unud.ac.id/index.php/jati/article/view/500