Iloprost infusion decreases skeletal muscle ischemia-reperfusion injury.
Iloprost (a long-acting prostacyclin analog) has been demonstrated to decrease cardiac muscle infarct size after ischemia-reperfusion injury. We investigated the ability of iloprost to decrease skeletal muscle injury and platelet sequestration after ischemia-reperfusion injury in a canine bilateral isolated gracilis muscle model. Anesthesized animals (n = 13) were subjected to 6 hours of gracilis muscle ischemia and 1 hour of reperfusion. Fifteen minutes before muscle reperfusion, the animals were infused with radium 111-labeled autogenous platelets. Experimental animals (n = 7) received a continuous preischemic intravenous infusion of iloprost (0.45 microgram/kg/hr) and two 0.45 microgram/kg intravenous injections of iloprost (10 minutes before the ischemic interval and 10 minutes before reperfusion). Muscle injury was measured with triphenyltetrazolium chloride histochemical staining. Platelet sequestration within ischemic muscle specimens was determined by measuring indium 111 activity in a gamma counter. Iloprost infusion decreased muscle infarct size from 57.0% +/- 12.6% in control animals to 15.8% +/- 4.4% in experimental animals (p less than 0.05). Platelet uptake in experimental and control muscle was 1.2 +/- 0.21 x 10(7) and 2.17 +/- 0.48 x 10(7) platelets/gm ischemic muscle, respectively (p = 0.1). Although platelet sequestration was not altered significantly in this experiment, a reduction in skeletal muscle injury was confirmed. Further investigation on the mechanisms of action of iloprost in chronic and acute skeletal muscle ischemia is warranted.
Department of Surgery, Boston University School of Medicine, Boston, Mass.
M
M
Belkin
J G
JG
Wright
R W
RW
Hobson
D000818:Animals; D001792:Blood Platelets / Q000187:drug effects / Q000502:physiology; D001794:Blood Pressure; D001831:Body Temperature; D002317:Cardiovascular Agents / Q000627:therapeutic use*; D004285:Dogs; D011464:Epoprostenol / Q000627:therapeutic use*; D005121:Extremities / Q000098:blood supply; D005260:Female; D016285:Iloprost; D008297:Male; D009132:Muscles / Q000098:blood supply* / Q000473:pathology / Q000503:physiopathology; D009135:Muscular Diseases / Q000188:drug therapy / Q000517:prevention & control*; D015427:Reperfusion Injury / Q000188:drug therapy / Q000473:pathology / Q000517:prevention & control*
D002317:Cardiovascular Agents; D011464:Epoprostenol; D016285:Iloprost