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        <BonusFilingOrganizationAmount>10500</BonusFilingOrganizationAmount>
        <DeferredCompensationFlngOrgAmt>26923</DeferredCompensationFlngOrgAmt>
        <TotalCompensationFilingOrgAmt>310819</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>PETER RYCUS</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>219549</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>10500</BonusFilingOrganizationAmount>
        <DeferredCompensationFlngOrgAmt>21538</DeferredCompensationFlngOrgAmt>
        <TotalCompensationFilingOrgAmt>251587</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc5">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>PROVIDING GLOBAL LEADERSHIP IN EXTRACORPOREAL LIFE SUPPORT THROUGH INNOVATION, ADVOCACY, AND ADVANCING KNOWLEDGE. ORGANIZATION'S VISION: ELSO WILL BE THE PREMIER ORGANIZATION FOR THE ADVANCEMENT OF EXTRACORPOREAL LIFE SUPPORT THROUGHOUT THE WORLD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>EDUCATION AND TRAINING: ELSO INCREASED OUR OFFERINGS OF IN-PERSON TRAINING FOR SIMULATION AND CANNULATION COURSES IN 2024, NOTING HIGH DEMAND FOR BOTH IN 2023. IN-PERSON COURSES BEGAN IN JANUARY AT THE SOCIETY FOR CRITICAL CARE MEDICINE (SCCM) CONFERENCE IN PHOENIX, ARIZONA, WHERE 60+ LEARNERS WERE TRAINED IN ECLS SIMULATION, WHICH ALSO QUALIFIES AS A STEP 2 CRITERIA FOR THE ADULT CERTIFICATION EXAM (E-AEC). SIMULATION AND CANNULATION COURSES WERE HELD IN APRIL, JUNE, SEPTEMBER, AND NOVEMBER. THIS WAS THE FIRST YEAR THAT A NEO/PEDS SIMULATION COURSE WAS HELD, WHICH WE EXPECT TO GROW NEXT YEAR WITH THE RELEASE OF THE REST OF THE NEO/PEDS COURSES. THIS WAS ALSO THE FIRST TIME THAT ELSO HELD ADULT SIMULATION COURSES IN CONCERT WITH OUR ANNUAL CONFERENCE. DEMAND IS GROWING FOR ELSO. FOUNDATIONS - A VIRTUAL TRAINING PROGRAM FOR ADULT PRACTITIONERS. DEMAND IS ALSO GROWING FOR THE CERTIFICATION EXAM: E-AEC, ALSO A VIRTUAL COURSE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUAL CONFERENCE: SEATTLE, WASHINGTON WAS THE LOCATION OF THIS YEAR'S CONFERENCE, WHICH SET A NEW ATTENDANCE RECORD FOR ELSO AT 1,509 IN PERSON ATTENDEES. SPONSORSHIP FROM INDUSTRY WAS ALSO AT A RECORD HIGH. WE HAD THE MOST SPEAKERS WE HAVE EVER INVITED, WHICH CONTINUES TO FOSTER THE NEXT GENERATION OF SCIENTIFIC LEADERSHIP, ALONG WITH MORE DIVERSITY. THIS WAS THE FIRST YEAR ELSO INVITED ISHLT TO JOINTLY DEVELOP WHAT BECAME TWO BREAKOUT SESSIONS ON TRANSPLANT-RELATED CONTENT. THE TEAMS DID A WONDERFUL JOB PLANNING THIS TOGETHER AND THERE WAS A LOT OF ENTHUSIASM FOR THE PARTNERSHIP. THE CONFERENCE FEATURED A MOUNTAIN HIKER RESCUE AND HIS CHAIN OF SURVIVAL TEAM AS OUR OPENING SESSION - A TEAM BASED IN SEATTLE, WHICH INCLUDED THE US NAVY. IT'S A REMARKABLE STORY THAT TIED IN MUCH WORK IN OUR FIELD FOR ECPR AND OTHER OUT OF HOSPITAL SYSTEMS THAT NEED TO COME TOGETHER TO ACHIEVE BETTER PATIENT OUTCOMES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4D</FormAndLineReferenceDesc>
        <ExplanationTxt>ELSO PUBLISHED A NEW GUIDELINE ON NEUROMONITORING IN NEONATAL AND PEDIATRIC PATIENTS SUPPORTED BY EXTRACORPOREAL MEMBRANE OXYGENATION. THE ELSO REGISTRY EXCEEDED 200,000 PATIENT RUNS AND DOCUMENTED OVER 100,000 LIVES SAVED THROUGH ECLS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ELSO MEMBER CENTERS (HOSPITALS AND HOSPITAL SYSTEMS) THAT PAY THEIR ANNUAL MEMBERSHIP DUES AND CONTRIBUTE DATA TO THE ELSO REGISTRY ARE CONSIDERED ACTIVE CENTER MEMBERS. INDIVIDUAL MEMBERS OF ELSO ARE PHYSICIANS AND NON- PHYSICIANS THAT PAY ANNUAL MEMBER DUES.CORPORATE MEMBERS ARE THOSE THAT PAY AN ANNUAL CORPORATE MEMBERSHIP FEE. CENTER MEMBERSHIP DUES DIFFER DEPENDING ON THE LOCATION OF THE CENTER. ELSO USES THE WORLD BANK ORGANIZATION'S RESOURCE CATEGORIZATION OF COUNTRIES TO APPLY DISCOUNTED RATES THAT REFLECT MORE CONSTRAINED RESOURCE COUNTRIES. ELSO IS A DIRECTORSHIP GOVERNANCE MODEL. THE BOARD OF DIRECTORS GOVERNS THE ORGANIZATION, WITH ITS ROLES AND RESPONSIBILITIES GRANTED UNDER THE STATE OF MICHIGAN FOR NON-PROFIT ORGANIZATIONS. ELSO MAINTAINS OUR BYLAWS ON OUR WEBSITE AND REPORTS CHANGES TO THE ATTORNEY GENERAL OF THE STATE OF MICHIGAN, AS REQUIRED BY STATE LAW. A STEERING COMMITTEE SERVES AS AN ADVISOR TO THE BOARD. THE STEERING COMMITTEE INCLUDES OUR GLOBAL CHAPTER CHAIRS, STANDING COMMITTEE CHAIRS, AND SEVERAL LIAISONS TO SPECIALTY CLINICAL PROFESSIONAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE OFFICERS OF THE BOARD ARE APPOINTED BY THE BOARD AS TERM LIMITS REQUIRE, WHICH ARE PUBLISHED IN ELSO'S BYLAWS, AVAILABLE AND MAINTAINED HERE: HTTPS://WWW.ELSO.ORG/ABOUTUS/BY-LAWS.ASPX. MAJORITY VOTES FOR OFFICERS ARE REQUIRED FOR A SUCCESSFUL ELECTION. STEERING COMMITTEE MEMBERS ARE NOMINATED BY ANY ACTIVE MEMBER CENTER. ELIGIBILITY CRITERIA AND TERM LIMITS ARE FOUND IN ELSO'S BYLAWS. STEERING COMMITTEE MEMBERS VOTE FOR ITS NEW MEMBERS AFTER THE NOMINATIONS &amp; MEMBERSHIP COMMITTEE HAS PREPARED A CANDIDATE LIST FROM THE NOMINATED CANDIDATES. THE STEERING COMMITTEE RATIFIES ITS VOTE CONDUCTED BY CONFIDENTIAL ELECTRONIC BALLOT. THE SC ELECTION RESULTS ARE FINALIZED BY THE BOARD OF DIRECTORS, WHERE THEY CAN RATIFY THE ELECTION RESULTS OR MAKE A CHANGE. MAJORITY VOTE OF THE BOARD IS REQUIRED FOR A SUCCESSFUL ELECTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE BOARD OF DIRECTORS. ONCE THE BOARD APPROVES THE FORM 990 IS SIGNED AND SUBMITTED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>IN THE EVENT THAT THE BOARD SHOULD ESTABLISH THAT A PROPOSED TRANSACTION OR ARRANGEMENT ESTABLISHES A CONFLICT OF INTEREST, THE BOARD SHALL THEN PROCEED WITH THE FOLLOWING ACTIONS: A)ANY INTERESTED INDIVIDUAL MAY RENDER A REQUEST OR REPORT AT THE BOARD MEETING, BUT UPON COMPLETION OF SAID REQUEST OR REPORT THE INDIVIDUAL SHALL BE EXCUSED WHILE THE BOARD DISCUSSES THE INFORMATION AND/OR MATERIAL PRESENTED, AND THEN VOTES ON THE TRANSACTION OR ARRANGEMENT PROPOSED INVOLVING THE POSSIBLE CONFLICT OF INTEREST. B)THE CHAIRPERSON OF THE BOARD SHALL, IF DEEMED NECESSARY AND APPROPRIATE, APPOINT A DISINTERESTED PERSON OR COMMITTEE TO INVESTIGATE ALTERNATIVES TO THE PROPOSED TRANSACTION OR ARRANGEMENT. C)AFTER EXERCISING DUE DILIGENCE, THE BOARD SHALL DETERMINE WHETHER ELSO CAN OBTAIN A MORE ADVANTAGEOUS TRANSACTION OR ARRANGEMENT FROM A PERSON OR ENTITY THAT WOULD AVOID A CONFLICT OF INTEREST. D)IF A MORE ADVANTAGEOUS TRANSACTION OR ARRANGEMENT IS NOT REASONABLY POSSIBLE UNDER CIRCUMSTANCES NOT PRODUCING A CONFLICT OF INTEREST, THE BOARD SHALL DETERMINE BY A MAJORITY VOTE OF THE DISINTERESTED DIRECTORS WHETHER THE TRANSACTION OR ARRANGEMENT IS IN ELSO'S BEST INTEREST, FOR ITS OWN BENEFIT, AND WHETHER IT IS FAIR AND REASONABLE. IT SHALL MAKE ITS DECISION AS TO WHETHER TO ENTER INTO THE TRANSACTION ARRANGEMENT IN CONFORMITY WITH THIS DETERMINATION. SHOULD THE BOARD HAVE REASONABLE CAUSE TO BELIEVE AN INTERESTED PERSON HAS FAILED TO DISCLOSE ACTUAL OR POSSIBLE CONFLICTS OF INTEREST, THE BOARD SHALL THEN INFORM THE INTERESTED PERSON OF THE BASIS FOR SUCH BELIEF AND AFFORD THE INTERESTED PERSON AN OPPORTUNITY TO EXPLAIN THE ALLEGED FAILURE TO DISCLOSE. IF, AFTER HEARING THE INTERESTED PERSON'S EXPLANATION AND AFTER MAKING FURTHER INVESTIGATION AS MAY BE WARRANTED IN CONSIDERATION OF THE CIRCUMSTANCES, THE BOARD DETERMINES THE INTERESTED PERSON INTENTIONALLY FAILED TO DISCLOSE AN ACTUAL OR POSSIBLE CONFLICT OF INTEREST, IT SHALL TAKE APPROPRIATE DISCIPLINARY AND CORRECTIVE ACTION. ALL MINUTES OF THE BOARD MEETINGS, WHEN APPLICABLE, SHALL CONTAIN THE FOLLOWING INFORMATION: A)THE NAMES OF ALL THE PERSONS WHO DISCLOSED OR OTHERWISE WERE FOUND TO HAVE A FINANCIAL INTEREST IN CONNECTION WITH AN ACTUAL OR POSSIBLE CONFLICT OF INTEREST, THE NATURE OF THE FINANCIAL INTEREST, ANY ACTION TAKEN TO DETERMINE WHETHER A CONFLICT OF INTEREST WAS PRESENT, AND THE BOARD'S DECISION AS TO WHETHER A CONFLICT OF INTEREST IN FACT EXISTED. B)THE NAMES OF THE PERSONS WHO WERE PRESENT FOR DISCUSSIONS AND VOTES RELATING TO THE TRANSACTION OR ARRANGEMENT, THE CONTENT OF THE DISCUSSIONS, INCLUDING ANY ALTERNATIVES TO THE PROPOSED TRANSACTION OR ARRANGEMENT, AND A RECORD OF ANY VOTES TAKEN IN CONNECTION WITH THE PROCEEDINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>IN DETERMINING THE COMPENSATION OF TOP OFFICIALS, A COMPARATIVE ANALYSIS IS CONDUCTED OF SIMILAR NON-PROFIT ORGANIZATIONS FOR MAJOR EVENTS (NEW HIRE, ETC.). IN LIEU OF NON-MAJOR EVENTS, COMPENSATION IS REVIEWED WITH THE PRESIDENT AND CEO ON AN ANNUAL BASIS. BENCHMARKING MAY BE PART OF THIS PROCESS, AT LEAST BIANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ELSO SHALL KEEP AT ITS PRINCIPAL OFFICE A COPY OF ITS FEDERAL TAX EXEMPTION APPLICATION AND ITS ANNUAL INFORMATION RETURNS FOR THREE YEARS FROM THEIR DATE OF FILING, WHICH SHALL BE OPEN TO PUBLIC INSPECTION AND COPYING TO THE EXTENT REQUIRED BY LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>STATISTICIAN SUPPORT SERVICES 196,506 0 0 EDUCATION SUPPORT SERVICES 87,579 0 0 CONFERENCE SUPPORT SERVICES 37,656 0 0 OTHER CONTRACT SERVICES 192,297 18,701 0 TOTAL 514,038 18,701 0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD 133,719 COST OF GOODS SOLD -133,719</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>