Ischemia modified albumin is a sensitive marker of myocardial ischemia after percutaneous coronary intervention.
BACKGROUND
Ischemia modified albumin (IMA; Ischemia Technologies, Inc) blood levels rise in patients who develop ischemia during percutaneous coronary intervention (PCI). It is not known whether IMA elevations correlate with increases in other markers of oxidative stress, ie, 8-iso prostaglandin F2-A (iP).


RESULTS
We compared IMA versus iP plasma levels in 19 patients (mean age 62.8+/-11.9 years) undergoing PCI and 11 patients (mean age 64+/-13.6 years) undergoing diagnostic angiography (controls). In the PCI patients, blood samples for IMA and iP were taken from the guide catheter before PCI and after balloon inflations, and from the femoral sheath 30 minutes after PCI. IMA was measured by the albumin cobalt binding (ACB) test and plasma iP by enzyme immunoassay. During PCI, all 19 patients had chest pain and 18 had transient ischemic ST segment changes. IMA was elevated from baseline in 18 of the 19 patients after PCI. Median IMA levels were higher after PCI (101.4 U/mL, 95%CI 82 to 116) compared with baseline (72.8 U/mL, CI 55 to 93; P<0.0001). Levels remained elevated at 30 minutes (87.9 U/mL, CI 78 to 99; P<0.0001) and returned to baseline at 12 hours (70.3 U/mL, CI 65 to 87; P=0.65). iP levels were raised after PCI in 9 of the 19 patients. However, median iP levels were not significantly different immediately (P=0.6) or 30 minutes after PCI (P=0.1). In the control group, IMA and iP levels remained unchanged before and after angiography (P=0.2 and 0.16, respectively).


CONCLUSIONS
IMA is a more consistent marker of ischemia than iP in patients who develop chest pain and ST segment changes during PCI.
Coronary Artery Disease Research Unit, St George's Hospital, London, UK.
Manas K
MK
Sinha
David C
DC
Gaze
John R
JR
Tippins
Paul O
PO
Collinson
Juan Carlos
JC
Kaski
D000368:Aged; D000418:Albumins / Q000032:analysis*; D000787:Angina Pectoris / Q000628:therapy; D015906:Angioplasty, Balloon, Coronary; D015415:Biomarkers / Q000097:blood; D001798:Blood Proteins / Q000032:analysis; D002637:Chest Pain / Q000209:etiology; D017023:Coronary Angiography; D015237:Dinoprost / Q000031:analogs & derivatives*; D004562:Electrocardiography; D028441:F2-Isoprostanes / Q000097:blood; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000097:blood* / Q000150:complications / Q000175:diagnosis*; D011183:Postoperative Complications / Q000097:blood*; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D020107:Troponin T / Q000097:blood
D000418:Albumins; D015415:Biomarkers; D001798:Blood Proteins; D028441:F2-Isoprostanes; D020107:Troponin T; C075750:8-epi-prostaglandin F2alpha; D015237:Dinoprost