EXHIBIT 32.1 ------------ Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with this quarterly report on Form 10-Q of Merit Medical Systems, Inc. I, Fred P. Lampropoulos, Chief Executive Officer of Merit Medical Systems, Inc., certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1) The report fully complies with the requirements of Section 13(a) or 15 (d) of the Securities Exchange Act of 1934; and (2) The information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Merit Medical Systems, Inc Date: November 13, 2003 /s/ Fred P. Lampropoulos ------------------------------------- Fred P. Lampropoulos Chairman of the Board, President and Chief Executive Officer