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BACKGROUND The management of patients with unprotected left main (LM) coronary artery disease remains challenging, with recent data casting a shadow of doubt on the safety of percutaneous coronary intervention. We aimed at describing the features of patients undergoing myocardial perfusion imaging (MPI) subsequently found to have LM disease. METHODS We queried our institutional database for subjects without prior revascularization or myocardial infarction (MI), who had undergone MPI followed by invasive coronary angiography within 6 months, comparing those with evidence of angiographically significant LM disease (i.e. diameter stenosis ≥50%) to those without significant coronary artery disease (CAD), or those with CAD not involving LM. Baseline, stress and imaging features were systematically collected and analyzed, and clinical outcomes (death, myocardial infarction, revascularization) sought. RESULTS We included a total of 74 patients with LM disease, which were compared with 70 without CAD, and 920 with significant CAD not involving LM. MPI was remarkably safe in all subjects, and significant differences were found for several features, but particularly so for ST change, rate pressure product, and left ventricular ejection fraction (all P

AIMS The impact of coronary revascularization on outcomes and ischemic burden among patients with objective proof of ischemia is not yet established. We appraised the impact of revascularization on outcomes and residual ischemia in patients with objective evidence of ischemia at myocardial perfusion scintigraphy (MPS). METHODS We queried our database for stable patients with myocardial ischemia at MPS, excluding those with prior myocardial infarction, systolic dysfunction, or cardiomyopathy. The impact of revascularization (defined as revascularization as first follow-up event) on outcomes and changes in myocardial ischemia at repeat MPS was appraised with propensity-matched analyses. RESULTS From 6195 patients, propensity matching yielded 1262 pairs of patients undergoing revascularization versus not undergoing revascularization. After 35.2 ± 23.9 months, revascularization was associated with lower risks of cardiac death [2 (0.2%) versus 10 (0.8%) in those not revascularized, P = 0.038] and of the composite of cardiac death or myocardial infarction [17 (1.3%) versus 37 (2.9%), P = 0.007]. In addition, revascularization was associated with a higher rate of improvement in ischemia degree after 28.1 ± 20.7 months of follow-up (P

Whether estimates of myocardial perfusion reserve (MPR) stemming from new-generation cadmium-zinc-telluride (CZT) cameras are accurate remains unclear. We queried our institutional database for patients undergoing MPR with CZT cameras. The primary goal was appraising the incremental diagnostic yield of MPR on top or at odds of maximal ischemia score (MIS). A total of 66 subjects were included. When distinguishing patients according to normal vs abnormal MPR (cut-off 2.1 mL/min/g) and normal vs abnormal MIS, 4 groups could be identified: 12 (18.1%) individuals with normal MPR and MIS, 12 (18.1%) with normal MPR and abnormal MIS, 16 (24.2%) with abnormal MPR and normal MIS, and 26 (39.4%) with abnormal MPR and MIS. MIS was significantly associated with several baseline features, whereas MPR did not. There was no significant association between MPR and MIS, nor with regional perfusion. Clinical outcomes were uncommon and not significantly associated with MPR or MIS, whereas angiographically significant coronary artery disease (CAD) was associated solely with MIS (P

Myocardial necrosis after myocardial infarction (MI) is common; extent and severity are however variable. The pattern is recognized by myocardial perfusion imaging (MPI) as fixed perfusion defects (FPD). The fate of such FPD is not well appraised. This study addressed this important issue in a large number of patients undergoing serial MPI in relation to type of intervening therapy. Patients with prior MI or MPI-evidence of myocardial necrosis undergoing serial MPI without intervening acute coronary syndromes were included. The fate of necrosis by MPI on per-patient and per-region analysis was analyzed, factoring also the impact of intervening coronary revascularization (CR). A total of 3691 patients with 25,837 regions were identified, including 1413 (38.3%) subjects with 3358 (13.0%) regions exhibiting necrosis. Serial MPI after 29±21 months confirmed the persistent presence of myocardial necrosis FPD in the vast majority of patients and regions (86%); the consistency was even higher in the presence of moderate or severe necrosis (99%). Neither type nor site of CR significantly impacted on the presence and extent of myocardial necrosis at multivariable analysis. The finding of myocardial necrosis by MPI remains highly consistent over time, and is not significantly altered by CR.

Hypoglycemic agents differ in mechanism, efficacy, and profile. However, there is uncertainty on their impact on myocardial perfusion. We thus aimed to investigate whether individuals with type 2 diabetes mellitus treated with different drug classes exhibit different perfusion patterns at myocardial perfusion scintigraphy (MPS).We queried our administrative database for patients with diabetes mellitus without prior or recent myocardial infarction. The primary objective was to compare the severity and extent of ischemia at MPS, distinguishing patients according to management strategy. A total of 7592 patients were included [2336 (31%) on diet, 3611 (48%) on metformin, 749 (10%) on sulfonylureas, 449 (6%) on metformin plus sulfonylureas, 447 (6%) on metformin plus insulin]. Unadjusted analyses and analyses adjusting for baseline features suggested that sulfonylureas alone or in combination were associated with more severe ischemia than nonsulfonylurea regimens (P0.05), whereas combination regimens including metformin were associated with more extensive myocardial ischemia than the other regimens (P0.05 for both). However, no significant difference disfavoring either metformin or sulfonylurea regimens persisted after multivariable adjustment for baseline, stress, and angiographic characteristics (all P0.05).Several significant differences in baseline, stress, and scintigraphic features appear evident in patients with diabetes mellitus receiving different hypoglycemic agents or regimens.

Randomized trials have challenged the role of revascularization in stable coronary artery disease. We aimed to appraise the impact of revascularization on ischemia in patients undergoing serial myocardial perfusion scintigraphy (MPS). We queried our institutional database for stable subjects undergoing serial MPS and appraised the impact of revascularization on changes in ischemia. A total of 3631 patients were included: 967 (27%) undergoing revascularization and 2664 (73%) receiving medical therapy only. Patients treated with revascularization had a significantly lower burden of myocardial ischemia at follow-up (odds ratio = 0.577 [95% confidence interval 0.483-0.689] vs medical therapy, P

Myocardial perfusion imaging (MPI) has an established role in the work-up of coronary artery disease (CAD), but its comparative accuracy is debated in elderly patients. We examined a large administrative database to appraise the performance of MPI in octogenarians. Our institutional database was queried for patients undergoing MPI without recent coronary revascularization or myocardial infarction (MI). We compared baseline, procedural, diagnostic, and prognostic features in patients aged

The definition, presentation, and management of myocardial infarction (MI) have changed substantially in the last decade. Whether these changes have impacted on the presence, severity, and localization of necrosis at myocardial perfusion imaging (MPI) has not been appraised to date. Subjects undergoing MPI and reporting a history of clinical MI were shortlisted. We focused on the presence, severity, and localization of necrosis at MPI with a retrospective single-center analysis. A total of 10,476 patients were included, distinguishing 5 groups according to the period in which myocardial perfusion scintigraphy had been performed (2004 to 2005, 2006 to 2007, 2008 to 2009, 2010 to 2011, 2012 to 2013). Trend analysis showed over time a significant worsening in baseline features (e.g., age, diabetes mellitus, and Q waves at electrocardiogram), whereas medical therapy and revascularization were offered with increasing frequency. Over the years, there was also a lower prevalence of normal MPI (from 16.8% to 13.6%) and ischemic MPI (from 35.6% to 32.8%), and a higher prevalence of ischemic and necrotic MPI (from 12.0% to 12.7%) or solely necrotic MPI (from 35.7% to 40.9%, p

Myocardial perfusion scintigraphy (MPS) has an established diagnostic and prognostic role in patients with or at risk for coronary artery disease, with ischemia severity and extent having already been identified as key predictors. Whether this is affected by the location of myocardial ischemia is uncertain. We aimed at comparing the prognostic outlook of patients undergoing MPS according to the site of ischemia. Our institutional database was queried for subjects undergoing MPS, without myocardial necrosis or recent revascularization. We focused on the prognostic impact of location of vessel-related ischemia (VRI) at MPS, distinguishing four mutually exclusive groups: single-VRI involving left anterior descending (LAD), single-VRI not involving LAD, multi-VRI involving LAD, and multi-VRI not involving LAD. The primary outcome was the long-term (>1 year) rate of death or myocardial infarction (D/MI). A total of 13,254 patients were included. Moderate or severe VRI occurred in 2,627 (20%) patients. Clinical outcomes were significantly different among the groups of patients with moderate or severe VRI, including death, cardiac death, non-fatal myocardial infarction or their composites (overall P