Differences Of IMR Between The Stable Angina And ACS Patients Undergoing PCI And Its Meaning

Objective:Index of microcirculatory resistance (IMR) has been validated as a measure of microvascular resistance. This study is to analyze the differences of IMR between the stable angina and ACS after PCI.Methods:A total of40patients who underwent successful PCI were enrolled in this study from March2013to April2014. The patients are divided into two groups. IMR-pre,IMR-post and AIMR were compared among these two groups.Results:1.There were no significant differences of clinical characteristics between the two groups, such as age, gender composition, history of hypertension, blood cholesterol; there were also no significant differences with the number of implanted stent.2. stable angina before PCI IMR was23.5±7.5U, acute coronary syndrome group after PCI IMR was25.6.0±11.6U, IMR value comparison between the two groups with no significant difference (P=0.59)2. stable angina after PCI IMR was28.7±8.5U, acute coronary syndrome group after PCI IMR was41.0±12.9U, IMR value comparison between the two groups with a statistically significant difference (P<0.001)3. stable angina AIMR was5.1±1.7U, acute coronary syndrome group△IMR was15.5±4.2U,△IMR value comparison between the two groups with a statistically significant difference (P<0.001) Conclusions:Index of Microvascular Resistance after PCI is often higher, especially in ACS patient.