PACING PARAMETERS CHANGES IN PATIENTS WITH IMPLANTED PACEMAKER IN DIFFERENT QRS COMPLEX DURATION CLASSES AT THE ANNUAL OBSERVATION STAGE. J. V. N. Karazin Khark. Nat. Univ., Ser. Med. [Internet]. 2015 Aug. 12 [cited 2026 Oct. 25];(29):49-52. Available from: https://periodicals.karazin.ua/medicine/article/view/3755