Effects of stem cell therapy on left ventricular remodeling after acute myocardial infarction: a meta-analysis.
OBJECTIVE
The objective was to perform a meta-analysis of clinical trials that investigated the effects of stem cell therapy on left ventricular remodeling in patients after acute myocardial infarction (AMI).


BACKGROUND
Intracoronary injection of stem cells in the acute phase of myocardial infarction has been proposed to replace the cardiomyocytes lost and to prevent deleterious pathological remodeling after myocardial infarction. Previously published trials have investigated the effects of cell therapy on left ventricular (LV) remodeling in AMI patients. However, the sample size of these studies is small and the conclusions are inconsistent.


METHODS
Trials were identified in the Cochrane Library, EMBASE, and PubMed databases, reviews, and reference lists of relevant articles. The weighted mean difference (WMD) was calculated for net changes in LV end-diastolic and end-systolic volumes (LVEDV and LVESV) by using fixed-effect models.


RESULTS
A total of 11 trials (13 comparisons) with 832 participants evaluated the association between stem cell therapy and changes in LVEDV. Compared with the control group, stem cell therapy did not influence the LVEDV changes from baseline to follow-up (WMD: - 1.76 mL, 95% confidence interval [CI]: - 4.61 to 1.08 mL, P = 0.233). A total of 9 trials (11 comparisons) with 797 participants evaluated the association between stem cell therapy and changes in LVESV. Compared with the control group, patients in the cell therapy group had a significantly greater reduction in LVESV from baseline to follow-up (WMD: - 5.08 mL, 95% CI: - 7.80 to - 2.37 mL, P < 0.001).


CONCLUSIONS
This meta-analysis suggests that cell therapy improves left ventricular contractility, but has no effect on LV remodeling.
Sun
Lan
L
National Center for Pharmaceutical Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
Zhang
Tiantai
T
Lan
Xi
X
Du
Guanhua
G
D002986:Clinical Trials as Topic; D019317:Evidence-Based Medicine; D006801:Humans; D008875:Middle Aged; D009200:Myocardial Contraction; D009203:Myocardial Infarction / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D009206:Myocardium / Q000473:pathology*; D020127:Recovery of Function; D033581:Stem Cell Transplantation; D013318:Stroke Volume; D013997:Time Factors; D016896:Treatment Outcome; D016277:Ventricular Function, Left; D020257:Ventricular Remodeling