CTO-PCI Group Research Articles

Exercise testing after chronic total coronary occlusion revascularization in patients with STEMI and a concurrent CTO: A subanalysis of the EXPLORE-trial.

To assess the effect of chronic total occlusion percutaneous coronary intervention (CTO PCI) on ventricular ectopy (VE) and symptomatology during exercise testing. During exercise, the hypoxic myocardium in the CTO-territory can act as a substrate for VE and could lead to anginal complaints. In the EXPLORE-trial, 302 ST-segment elevation myocardial infarction (STEMI)-patients were randomized to CTO PCI or no-CTO PCI. For this sub-study, we analyzed all available exercise electrocardiograms (X-ECGs) at 4 months follow-up on symptoms and electrocardiographic parameters. A total of 155 X-ECGs were available, 80 in the CTO PCI group (51.6%) and 75 in the no-CTO PCI group (48.4%). There were no differences regarding exercised time, achieved endurance, ST-deviation nor maximum heart-rate. The percentage of patients experiencing chest-pain during exercise was lower in the CTO PCI group (0% vs. 8.5%, p = .03). Also, there was a trend towards a higher maximum systolic blood pressure (SBP, 185 mmHg vs. 175, p = .09). No difference in VE was found between randomization groups, but patients with successful CTO PCI had a higher frequency of VE, compared to failed and no-CTO PCI (26% vs. 8%, p = .02). This did not result in higher frequencies of sustained ventricular arrhythmias or mortality. In conclusion, in STEMI-patients, CTO PCI is associated with a small reduction of chest-pain during exercise and tended to be associated with an increase of maximum SBP. The observation that successful CTO PCI was associated with more VE during exercise, compared with failed/no-CTO PCI needs further exploration.

Two-year clinical outcomes of medical therapy vs. revascularization for patients with coronary chronic total occlusion

ObjectivesThere are little data on the long-term clinical outcomes of medical therapy (MT) compared with revascularization in patients with chronic total occlusions (CTOs). MethodsBetween January 2007 and December 2016, a total of 1655 patients with ≥1 CTO were enrolled in our center and were divided into the MT group (n = 800) and revascularization group (n = 855) according to the initial treatment strategy. Propensity score matching was also performed to adjust for baseline characteristics. The primary outcome was cardiac death. ResultsAfter 2 years of follow-up, there was no significant difference between the two groups with regard to the prevalence of cardiac death (MT vs. revascularization: 6.6% vs. 4.2%, adjusted hazard ratio [HR] 0.95, 95% confidence interval [CI] 0.60–1.49, p = 0.820). In the propensity-matched population (406 pairs), there were no significant differences in the prevalence of cardiac death (MT vs. revascularization: 5.4% vs. 4.7%, HR 0.88, 95% CI 0.48–1.63, p = 0.694), except for target vessel revascularization (TVR) (0.44, 0.31–0.63, <0.001) and major adverse cardiovascular events (MACE) (0.51, 0.38–0.68, <0.001), between the two groups. There were also no significant differences in the prevalence of cardiac death (MT vs. successful CTO-PCI: 6.6% vs. 4.0%, HR 0.94, 95% CI 0.41–2.15, p = 0.881) between the MT and successful CTO-PCI groups. ConclusionAs an initial management strategy in patients with CTOs, revascularization did not reduce the risk of cardiac death compared with treatment with medical therapy alone. However, revascularization was associated with reduction in the prevalence of TVR and MACE. Furthermore, successful CTO-PCI was also not associated with improved long-term survival compared with MT alone.

Contemporary perspectives on coronary chronic total occlusion: Data from a Large French Registry (CARDIO-ARSIF)

The aim of this study was to provide contemporary data on chronic total occlusion (CTO) prevalence and management in a large unselected population in the greater Paris area, and to compare percutaneous coronary intervention (PCI) features in patients with and without CTO. Contemporary data on the prevalence, clinical characteristics and management of CTO in a large unselected population are scarce. Between 2012 and 2015, 258,526 elective coronary procedures were performed in the greater Paris area and registered in the CARDIO-ARSIF (Agence régionale de santé Île de France) registry. Patients with acute coronary syndrome or previous coronary artery bypass grafting were excluded. Coronary CTO features were assessed and PCIs with and without CTO were compared. Among 128,739 included patients, 10,468 (8.1%) had at least one CTO. Cardiovascular risk-factor burden was higher in the CTO group, which had more patients with multivessel disease (73.8% vs. 23.5%) and with referral for interventional management (59% vs. 33%). In the CTO-PCI group, 86.6% of patients had documented ischemia. Of all PCIs during the study period, 5.7% involved a CTO; this proportion increased significantly over the study period. PCI success rate was 75.9% in the CTO group. CTO-PCI volume per center did not correlate with CTO-PCI success rate ( Table 1 ). CTO is common in patients undergoing scheduled coronary angiography. Invasive management is done more often in patients with than without CTO. The success rate of PCI in CTO is not associated with case volume per center.

Chronic total occlusion intervention of the non-infarct-related artery in acute myocardial infarction patients: the Korean multicenter chronic total occlusion registry.

The Korean chronic total occlusion (CTO) registry was collected prospectively from 26 cardiovascular centers since May 2007. The aim of this study is to investigate the impact of a successful staged percutaneous coronary intervention (PCI) of CTO lesions in acute myocardial infarction (AMI) patients on clinical outcomes. Among 2813 patients who underwent a staged PCI because of CTO lesions, 422 (15%) patients underwent primary PCI because of AMI. Among 422 patients, successful staged CTO-PCI was performed in 76%. The clinical outcomes were compared between the successful CTO-PCI group (n=321) and the failed CTO-PCI group (n=101). To adjust for potential confounders, a propensity score matching (PSM) analysis was carried out using the logistic regression model. After the PSM analysis, two propensity-matched groups (85 pairs, n=170) were generated and the baseline characteristics were balanced. The incidence of total death (P=0.029) and non-ST-segment elevation myocardial infarction (NSTEMI, P=0.043) at 1 year was higher in the failed CTO-PCI group. Multivariate regression showed that successful CTO-PCI was an independent predictor of preventing mortality (hazard ratio, 0.21, P=0.048). In the subgroup analysis, the Kaplan-Meier curve showed that successful CTO-PCI had a lower incidence of total death (log-rank=0.004) and cardiac death (log-rank=0.005) up to 1 year in NSTEMI patients. Cox-proportional analysis showed that successful CTO-PCI was beneficial in patients with NSTEMI, hypertension, and non-left-anterior descending artery lesion for preventing mortality. In this study, a staged successful CTO-PCI in AMI patients was associated with improved 1-year survival in the Korean population.

Abstract 20929: Impact of Complete Revascularization on Long-Term Clinical Outcomes in Patients With Multi-Vessel Disease Including Chronic Total Occlusion

Introduction: Chronic total occlusion (CTO) intervention is still challenging because of the limited procedural success rate and higher recurrence. Also, it is not clear whether the complete revascularization will significantly improve the angiographic and clinical outcomes in patients with multi-vessel disease (MVD) including CTO. Hypothesis: We assessed that the impact of complete revascularization on long-term clinical outcomes in patients with MVD including CTO. Methods: A total of 559 CTO patients with MVD who underwent percutaneous coronary intervention (PCI) for CTO lesion at Sejong General Hospital and Korea University Guro Hospital were enrolled and divided into two groups according to complete revascularization (CTO-PCI; n=325) or not (optimal medial therapy for non-CTO lesion, CTO-OMT; n=234). To adjust potential confounders, a propensity score matching (PSM) analysis was performed. The individual and composite major clinical outcomes were compared between the two groups up to 5 years. Results: After PSM analysis, two PSM groups (186 pairs, total=372) were generated and the baseline characteristics were balanced. Although the CTO-PCI group showed a higher incidence of target lesion and vessel revascularization (TLR and TVR) on CTO, there was a trend toward lower incidence of myocardial infarction (MI) and the incidence of total death or myocardial infarction (MI) was lower in the CTO-PCI group compared with the CTO-OMT group up to 5 years (Table). Conclusions: In the present study, successful CTO-PCI was associated with a lower trend of MI as well as reduction of the risk of total death or MI up to 5-year in CTO patients with MVD regardless of treatment strategy for the non-CTO target vessel.

Prognostic value of the age, creatinine, and ejection fraction score for non-infarct-related chronic total occlusion revascularization after primary percutaneous intervention in acute ST-elevation myocardial infarction patients: A retrospective study.

It is not known if ACEF scores could evaluate the prognosis of recanalization of non-infarct-related coronary arteries (non-IRA) with chronic total occlusions (CTO) in patients who successfully underwent primary PCI. The objective of the current study was to assess the prognostic value of ACEF scores in acute ST-segment elevation myocardial infarction (STEMI) patients with non-IRA CTO after successful primary PCI. There were 2952 STEMI patients who underwent successful primary PCI from January 2006 to December 2014 in our hospital, among them 377 patients had a non-IRA CTO lesion. The patients were divided into successful CTO-PCI group (n = 221) and failed/non-attempted CTO-PCI group (n = 156). Patients were stratified based on the ACEF tertiles. Primary end points measured in the current study were major adverse cardiac events (MACE) defined as the composite of all-cause death, nonfatal myocardial infarction, ischemia-driven coronary revascularization and hospitalization for heart failure at 1 year. The incidence of MACE, all-cause death and cardiac death were higher in the failed/non-attempted CTO-PCI group (P < 0.001). In the successful CTO-PCI group, the cumulative 1-year incidences of MACE and all-cause death were decreased compared to those in the failed/non-attempted CTO-PCI group (log-rank P < 0.001). The risk for MACE was reduced in the successful CTO-PCI group compared to the failed/non-attempted CTO-PCI group in patients with low and intermediate ACEF scores (log-rank P = 0.02). Successfully staged CTO-PCI could gain advantageous clinical outcomes in those patients with low or intermediate ACEF scores.

Long-term MACCE Rate after Retrograde Compared to Antegrade Recanalization of Chronic Total Coronary Occlusions

Background: The recanalization success rate of chronic total occlusion (CTO) percutaneous coronary interventions (PCI) can be increased by the retrograde approach. However, the long-term outcome of patients undergoing retrograde procedures is unknown. Aim: We aimed to evaluate the long-term MACCE (major adverse cardiac and cerebrovascular event) rate (death, myocardial infarction, coronary artery bypass surgery and stroke) in patients after retrograde versus antegrade CTO-PCI. Methods and results: In a prospective single center study from January 2008 to June 2012, 396 consecutive patients with CTO´s (≥ 3 months old) were enrolled. Mean age was 63.4 ± 10.3 years, 86.4% were male. The recanalization success rate of the total patient cohort was 88.6%. The retrograde PCI, only attempted after a failed antegrade intervention, was performed in 18% (n = 71) of patients. Long-term MACCE rate (mean follow up 2.3 ± 1.6 years) was significantly higher in the unsuccessful compared to the successful CTO-PCI group (23.1% versus 9.4%, p = 0.01) and this was also the case in the subgroup of antegrade CTO-PCI. In the retrograde subgroup, however, procedural success had no impact on outcome. As a possible explanation for this surprising finding, patients with unsuccessful retrograde CTO-PCI had a significantly better collateral connection compared to patients with an unsuccessful antegrade approach. Conclusions: Long-term MACCE rate after unsuccessful recanalization was significantly higher which was driven by a higher MACCE rate after unsuccessful versus successful antegrade approach. In contrast, procedural success in the retrograde group had no impact on outcome.

Comparison of procedural complications and in-hospital clinical outcomes between patients with successful and failed percutaneous intervention of coronary chronic total occlusions: a meta-analysis of observational studies.

Multiple attempts to pass guidewires and balloons across totally occluded segments may result in significant mechanical trauma and higher rates of coronary complications in patients undergoing PCI (percutaneous coronary intervention) for CTOs (chronic total occlusion). It is unknown whether these procedural complications affect short-term survival and in-hospital clinical outcomes after the PCI. The goal of this analysis was to clarify this issue by comparing the rates of adverse in-hospital clinical outcomes between successful and failed CTO-PCI groups. We performed a meta-analysis of 25 studies (16,490 patients) to determine the rates of in-hospital death, myocardial infarction (MI), major adverse cardiovascular events (MACE), and urgent CABG (coronary artery bypass grafting) for the successful and failed CTO-PCI groups. Compared to successful CTO PCI, failed CTO PCI procedures were associated with higher in-hospital mortality (1.44% versus 0.5%) [relative risk (RR) of 2.88, 95% confidence interval [CI] (1.96-4.24), P<0.001], a higher risk of in-hospital MACE (8.88% versus 3.75%) [RR of 2.25, CI (1.69-2.98), P<0.001], slightly higher risk of in-hospital MI (3.17% versus 2.4%) [RR of 1.35, CI (1.03-1.78), P=0.03] and increased need for urgent CABG (4.0% versus 0.5%) [RR of 6.67, CI (4.26-10.43), P<0.001]. Furthermore, higher rates of coronary perforations [RR of 5.0, CI (3.93-6.59), P<0.001] and cardiac tamponade [RR of 5.0, CI (1.97-12.69), P<0.001] were observed in the unsuccessful PCI arm. As compared to successful interventions, failed PCI attempts for CTOs appear to be associated with higher risk of adverse short-term clinical outcomes.

Impact of Chronic Total Occlusion Revascularization in Patients With Acute Myocardial Infarction Treated by Primary Percutaneous Coronary Intervention

Coronary chronic total occlusion (CTO) carries a poor outcome in patients with acute myocardial infarction (AMI) treated with primary percutaneous coronary intervention (PCI). We sought to investigate the prognostic impact of a staged successful CTO-PCI in patients with AMI treated with primary PCI. Outcome analysis included consecutive patients treated by successful primary PCI with coexisting non-infarct-related artery CTO who survived after 1week from AMI. A comparison between patients with successful CTO-PCI and patients with failed or nonattempted CTO-PCI was performed. The primary end points of the study were 1-year and 3-year cardiac survival. Of 1,911 patients who underwent successful primary PCI for AMI from 2003 to 2012, 169 (10%) had non-infarct-related artery CTO of a major branch. Astaged CTO-PCI attempt was performed in 74 patients (44%) and was successful in 58 (success rate 78%). All patients with successful CTO-PCI received drug-eluting stents. In the successful CTO-PCI group, a complete coronary revascularization was achieved in 88% of thepatients. The 1-year cardiac mortality rate was 1.7% in the successful CTO-PCI group and 12% in nonattempted or failed CTO-PCI group (p= 0.025). Successful CTO-PCI was an independent predictor of 3-year cardiac survival (hazard ratio 0.20, 95% confidence interval 0.05 to 0.92, p= 0.038). In conclusion, successful CTO-PCI in survivors after primary PCI is associated with improved long-term cardiac survival.

Long-Term Outcomes After Percutaneous Coronary Intervention for Chronic Total Occlusion (from the CREDO-Kyoto Registry Cohort-2)

Despite improving success rate of percutaneous coronary intervention (PCI) for chronic total occlusion (CTO) lesions, the clinical benefit of recanalization of CTO is still a matter of debate. Of 13,087 patients who underwent PCI in the CREDO-Kyoto registry cohort-2, 1,524 patients received PCI for CTO (CTO-PCI). Clinical outcomes were compared between 1,192 patients with successful CTO-PCI and 332 patients with failed CTO-PCI. In-hospital death tended to occur less frequently in the successful CTO-PCI group than in the failed CTO-PCI group (1.4% vs 3.0%, p = 0.053). Through 3-year follow-up, the cumulative incidence of all-cause death was not significantly different between the successful and failed CTO-PCI groups (9.0% vs 13.1%, p = 0.18), whereas the cumulative incidence of cardiac death was significantly less in the successful CTO-PCI group than in the failed CTO-PCI group (4.5% vs 8.4%, p = 0.03). However, after adjusting confounders, successful CTO-PCI was associated with lesser risk for neither all-cause death (hazard ratio 0.93, 95% confidence interval 0.64 to 1.37, p = 0.69) nor cardiac death (hazard ratio 0.71, 95% confidence interval 0.44 to 1.16, p = 0.16). The cumulative incidence of coronary artery bypass grafting (CABG) was remarkably less in patients with successful PCI compared with those with failed PCI (1.8% vs 19.6%, p <0.0001). In conclusion, successful CTO-PCI compared with failed PCI was not associated with lesser risk for 3-year mortality. However, successful CTO-PCI was associated with significantly less subsequent CABG.