Introduction: Coronary intervention has been accepted as best optional therapy for many patients with coronary artery disease (CAD). Slight increases in serum cardiac markers frequently occurred after even successful Percutaneous Coronary Intervention (PCI) and are considered, by some, as a predictor of long term morbidity and mortality. The aim of study was to evaluate postprocedure CTnI, CKMB; and whether such elevations bore any relationship to clinical, angiographic and technical variables.Methods and Material: 122 consecutive patients with stable CAD who underwent elective uncomplicated PCI (direct and conventional stinting) at Ghaem Hospital, Mashhad, between July 2003 and October 2004 were studied. Patients with recent history of ACS and who developed major in - hospital complications (nonfatal MI, death, CABG) were excluded from this study. Blood sample was routinely taken from all patiets at 20 hrs after procedure. In our institution the upper UNL for CTnI is ≤ 2 ng 1cc and for CKMB is ≤ 24 IU/L. The relation of postprocedure level of markers and clinical (age, sex, risk factors for CAD, Severity of symptoms as defined by CCS class, previous Acute coronary syndroms) and angiographic or procedural (ACC IAHA Lesion type, severity single or 2 2 VPCI and direct versus conventional stinting) characteristics were analyzed using Chi-Square, T-Student and ANOVA tests.Results: Abnormal post procedural values of one or more markers were observed in 49.5% (N=57) of patients. CTnI elevation was observed in 32% (N=39) and CKMB elevation in 26/3% (N=31) of all patients. The incidence of abnormal CTnI was higher than that of CKMB (P= 0.1). Older age (>57y/o) was associated with higher elevation of CTnI after PCI, compared with younger (p= 0.01). Elevation of CKMB in hypertensive patients was significantly higher than normotensive ones (p= 0.01). There was no significant difference in enzyme elevation between types a & bland b2&c lesions, variant degrees of severity of stenosis, single and multivessel PCI, and direct vs. conventional stinting. Also, associations were not observed with other clinical, angiographic or procedural variables.Conclusion: The results of this study indicated that enzyme elevation is not uncommon after elective, uncomplicated PCI in patients with stable angina. Elevation of CTnI, (although nonsignificant) is more common. Older patient and hypertensive ones had significantly higher elevation of cardiac markers after PCI. Such association was not observed with other clinical, angiographic or technical variables.