ABSTRACT
<p><b>OBJECTIVE</b>To explore the clinical values of ST-segment changes in ST-segment elevated myocardial infarction (STEMI) patients within 24 hours after primary percutaneous coronary intervention (PCI).</p><p><b>METHODS</b>A total of 225 patients with STEMI underwent primary PCI were enrolled, the ST segment resolution 1 hour after PCI was calculated and the patients were divided into group A (n = 135, Sgr;STE resolved ≥ 50%) and group B (n = 90, Sgr;STE resolved < 50%). The patients in group B were further divided into group C (n = 56, Sgr;STE resolved ≥ 50%) and group D (n = 34, Sgr;STE resolved < 50%) according to the ST segment resolution at 24 hours after PCI. TIMI flow after PCI, in-hospital major adverse cardiac events (MACE) and cardiac function about 7 days post PCI were analyzed.</p><p><b>RESULTS</b>Data between group A and group B were similar except the incidence of pre-PCI Killip ≥ II was significantly higher in group B than in group A (37.8% (34/90) vs. 17.0% (23/135), P < 0.05). Incidence of complicated diabetes (P < 0.05), pre-PCI Killip ≥ II (55.9% (19/34) vs. 26.8% (15/56), P < 0.05) and multivessel disease (70.6% (24/34) vs. 35.7% (20/56), P < 0.05) were significantly higher in group D than in group C. TIMI 3 and the opening time of IRA was similar between group A and group B and between group C and group D. The incidence of in-hospital MACE was significantly higher in group B than in group A (14.4% (13/90) vs. 3.0% (4/135), P < 0.05) which was similar between group C and group D.</p><p><b>CONCLUSION</b>Early (1 hour) but not late (24 hours) ST resolution post PCI is related to a favorable clinical outcome in STEMI patients.</p>