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Intravascular Mesenchymal Stem Cells to Treat Organ Failure and Possible Application in COVID-19



                                    Improvement in LVEF at 4 and   Improvement in ventricular  function. MSC infusion during   No change in LVEF, systolic  and diastolic volumes, as well as   which are RCTs, have assessed the
                                                                    York Heart Association Functional Classification; LVEDD, left ventricular end-diastolic diameter; PCI, percutaneous coronary intervention; BNP, B-type natriuretic peptide; IL-6, interleukin-6;
                                                                                 At least 52 studies, many of
                                                              PCT, prospective controlled trial; BM MNC, bone marrow mononuclear cells; BM MSC, bone marrow mesenchymal stem cells; UC MSC, umbilical cord mesenchymal stem cells; PAS, passage;
                                                                              ability of intravascular stem cells
                                                                              to treat heart failure of ischemic
                                                                              and nonischemic etiology . These
                                                                              studies have been summarized in
                      Findings  No change.  12 months.  CABG.  infarct size.  Table 2. Studies that injected stem
                                                                              cells  into  the  cardiac muscle  were
                                                                              excluded. Ischemic heart disease
                     Follow-  Up                                              was addressed in most studies;
                                                                              however, heart failure and dilated
                             24
                                              12
                                     12
                                                       6
                                                                              cardiomyopathy was treated in 6
                                                                              and 5 studies, respectively. Carotid
                     LVEF   Impact  No  Yes   - improvement  Not assessed  No  sinus infusion was used in one study
                                                                              and IV infusion in 2 studies with
                                                                              intracoronary in the rest. In 3 trials,
                                                                              MSC infusion was performed into
                      Outcome  No    Yes      Yes      No                     the grafts during coronary artery
                                                                              bypass grafting (CABG) surgery
                                                                              (48-52). Thirty-nine of the 52 tri-
                      Condition  IHD  IHD     IHD      IHD                    als used autologous bone marrow
                                                                              mononuclear  cells.  Twenty-nine  of
                                                                              these 39 studies showed beneficial
                                                                              effects. Seven studies utilized ex-
                     Delivery   Method        CABG              SVF, stromal vascular fraction; UNK, unknown; IC, intracardiac injection; CS, coronary sinus; CABG, coronary artery bypass grafting; IV, intravenous injection; IHD, ischemic heart disease; DCM,  dilated cardiomyopathy; HF, heart failure; LVEF, left ventricular ejection fraction; LVEDV, left ventricular end-diastolic volume; EDV, end-diastolic volume; ESV, end-systolic volume; NYHA, New  TNF-α, tumor necrosis factor-alpha
                                                                              one  of  these  trials  used  allogeneic
                                     IC
                             IC
                                                       IC
                                                                              expanded bone marrow MSCs and
                   Type   of   Stem   Cell  BM   MNC  BM   MSC  [?Pas#]  BM   MNC  BM   MNC  the rest were autologous. Positive
                                                                              outcomes were noted in all but 1 of
                                                                              these 7 trials. Umbilical cord MSCs
                     Number of   150 million  70 million  130 million  100 million  concentrate using bedside devices
                                                                              were used in 4 studies, bone marrow
                                                                              were used in 2 studies, both bone
                       SCs
                                                                              marrow MNC and expanded bone
                 Table 2 con't. MSC therapy studies treating cardiac failure.
                                                                              marrow stem cells were used in 2
                     BMA   (mL)  100  20–25   60       100                    studies, and all these trials reported
                                                                              statistically significant favorable


                                                                              dices in the treatment cohort when
                   No. of   Patients in   Treatment   Group                stem cells; NA, not available; Allo, allogeneic; BMC, bone marrow concentrate; E/e, heart failure ratio.   outcomes in various measured in-
                                                                              compared with controls. Most stud-
                                                       66
                             79
                                              24
                                     14
                                                                              ies enhanced left ventricular ejec-
                                                                              tion fraction (LVEF) and a few also
                     Type of   Study  RCT  Controlled   trial  RCT  RCT       improved ventricular remodeling
                                                                              parameters, such as left ventricular
                                                                              end diastolic and systolic volumes.
                      Year   2018    2018     2018     2018                   Although not observed in all stud-
                                                                              ies, many studies showed improved
                                                                              death/hospitalization/myocardial
                      Author  Traverse et al,   Circ Res 2018;   122:479-488  Kim et al,   Cardiovasc   Drugs   Ther 2018;   32:329-338  Qi et al, J Clin   Ultrasound   2018;   46:512-518  Nicalau et al, J   Cardiothoracic   Vasc Anesth   2018;   41:392-399  reinfarction rates and New York
                                                                              Heart Association scores (Table 2). In
                                                                              3 trials, MSC infusion into the grafts
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