Remote ischemic preconditioning of the recipient reduces myocardial ischemia-reperfusion injury of the denervated donor heart via a Katp channel-dependent mechanism.

Abstract:

BACKGROUND:We assess whether remote ischemic preconditioning (rIPC) of the recipient can modify ischemia-reperfusion (IR) injury in the donor heart following orthotopic heart transplantation from brain dead donors and to examine potential mechanisms of protection. METHODS:Sixteen pigs weighing from 26 to 34.2 (mean 29.2) kg, randomized to control group (n=5), ischemic preconditioning (rIPC) group (n=6), and to receive rIPC with prior glibenclamide administration (Glib + rIPC) group (n=5) underwent orthotopic heart transplantation with the support of hypothermic (32 degrees C) cardiopulmonary bypass (CPB). The hearts were harvested from donor animal rendered brain dead by balloon compression via a craniotomy. Preconditioning of the recipients was induced by four 5-min cycles of lower limb ischemia. Myocardial infarction (MI) was induced following heart transplantation by 30 min of left anterior descending (LAD) artery occlusion following by 2 hr of regional reperfusion. The extent of myocardial infarction was assessed by triphenyltetrazolium (TTC) staining. RESULTS:Preconditioning of the recipient reduced the mass of MI (6.75+/-6.3 g in rIPC vs. 18.1+/-5.8 g in control, P=0.01), MI to area at risk (ARR) mass ratio by 57% (15.6%+/-15.2% vs. 36.3%+/-13.4%, P=0.04). The protective effect of preconditioning was abolished by pretreatment with glibenclamide. CONCLUSIONS:Remote ischemic preconditioning of the recipient, decreases ischemia-reperfusion injury in the brain dead donor heart following orthotopic heart transplantation via a Katp channel-dependent mechanism. This study suggests that a circulating effector persists after the rIPC stimulus is applied, and excludes an ongoing afferent neurogenic mechanism of cardioprotection.

journal_name

Transplantation

journal_title

Transplantation

authors

Konstantinov IE,Li J,Cheung MM,Shimizu M,Stokoe J,Kharbanda RK,Redington AN

doi

10.1097/01.tp.0000159137.76400.5d

subject

Has Abstract

pub_date

2005-06-27 00:00:00

pages

1691-5

issue

12

eissn

0041-1337

issn

1534-6080

pii

00007890-200506270-00008

journal_volume

79

pub_type

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