title: Transcoronary stem cell delivery using physiological endothelium-targeting perfusion technique: the rationale and a pilot study involving a comparison with conventional over-the-wire balloon coronary occlusions in patients after recent myocardial infarction.
abstract: BACKGROUND
  Recent evidence shows poor efficacy of over-the-wire balloon catheter (OTW) coronary occlusive technique adopted widely for intracoronary bone marrow stem cell (BMSC) delivery. The waterfall effect of OTW-balloon inflation/deflation with reactive > or = 2-fold flow velocity increase might be partly responsible for poor BMSC retention.
  
  
  OBJECTIVE
  To evaluate the safety, feasibility and tolerability of perfusion-infusion BMSC delivery with the facilitation of cell rolling in contact with the coronary endothelium (a pre-requisite for downstream transmigration).
  
  
  METHODS
  We randomly assigned 11 patients (age 41-72 years) with first anterior myocardial infarction treated with PTCA+stent and LVEF < or =45% at 6-9 days to OTW in-stent occlusive (3 x 3 min.) BMSC delivery or cell infusion via a perfusion catheter with multiple side holes (SH-PC).
  
  
  RESULTS
  OTW and SH-PC patients had a similar infarct size (mean peak CK 4361 vs 4717 U/L), LVEF (41.2% vs 40.3%), infused mononuclear cell number (2.99 x 108 range 0.61-7.48 x 108 vs 3.28 x 108 range 1.64-4.39 x 108), CD 34(+) number (1.79 x 106 vs 1.62 x 106), cell viability (91.5% vs 91.8%) and clonogenicity (CFU assay). None of the SH-PC, but 67% of OTW patients, had ST-segment elevation with chest pain (and nsVT in one) that limited OTW occlusion tolerance to 50-110 sec. At 6 months DLVEF in the OTW vs SH-PC patients was +4.2% (2-6) vs +8.8% (5-16) by MRI and +4.8 (2-7) vs +13.8% (2-24) by SPECT.
  
  
  CONCLUSIONS
  Our work indicates that the SH-PC technique can be used safely for intracoronary BMSC transplantation. Further research is needed to determine whether the putative advantages of physiological SH-PC delivery translate into enhanced BMSC homing.
authors.affiliation: Klinika Chorób Serca i Naczyń CM UJ, ul. Pradnicka 80, 31-202 Kraków, Poland. pmusialek@szpitaljp2.krakow.pl
authors.forename: Piotr
authors.initials: P
authors.lastname: Musiałek
authors.forename: Wiesława
authors.initials: W
authors.lastname: Tracz
authors.forename: Aleksander B
authors.initials: AB
authors.lastname: Skotnicki
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Zmudka
authors.forename: Piotr
authors.initials: P
authors.lastname: Pieniazek
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Walter
authors.forename: Marta
authors.initials: M
authors.lastname: Szostek
authors.forename: Marcin
authors.initials: M
authors.lastname: Majka
authors.forename: Dorota
authors.initials: D
authors.lastname: Weglarska
authors.forename: Jarosław
authors.initials: J
authors.lastname: Zalewski
authors.forename: Maria
authors.initials: M
authors.lastname: Olszowska
authors.forename: Magdalena
authors.initials: M
authors.lastname: Kostkiewicz
authors.forename: Mieczysław
authors.initials: M
authors.lastname: Pasowicz
authors.forename: Piotr
authors.initials: P
authors.lastname: Klimeczek
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Przewłocki
mesh_terms: D000328:Adult; D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D016026:Bone Marrow Transplantation / Q000379:methods*; D005260:Female; D018380:Hematopoietic Stem Cell Transplantation / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000628:therapy*; D015425:Myocardial Reperfusion / Q000379:methods*; D010865:Pilot Projects; D016896:Treatment Outcome