Impact of Periprocedural Myocardial Injury on Long-Term Outcomes After Percutaneous Coronary Intervention Requiring Atherectomy.

The prognostic implications of cardiac troponin elevation after percutaneous coronary intervention (PCI) with atherectomy have not been established. The aim of this study was to investigate the incidence of periprocedural myocardial injury (PMI) and its association with cardiovascular events in patients with severely calcified lesions who underwent PCI with atherectomy. The study analyzed 346 patients (377 lesions) who underwent PCI with atherectomy between January 2018 and December 2021. Peak post-PCI high-sensitivity cardiac troponin (hs-cTn) was measured. The primary outcome was target lesion failure (TLF), a composite of cardiovascular death, target vessel myocardial infarction, and clinically driven target lesion revascularization. A lesion-based analysis was conducted to assess the association of PMI with TLF up to 5 years after PCI. Increase of hs-cTn was seen with 362 lesions (96%), and significant PMI, defined as hs-cTn increase ≥70 × upper reference limit, was seen with 83 lesions (22%). Significant PMI was associated with a significantly greater risk of TLF (adjusted hazard ratio 1.93, 95% confidence interval 1.12 to 3.30, p = 0.017), primarily driven by an increased risk of cardiovascular death (adjusted hazard ratio 5.29, 95% confidence interval 1.46 to 19.16, p = 0.011). In conclusion, hs-cTn increase was frequently observed in patients who underwent PCI with atherectomy, and significant PMI was associated with an increased risk of TLF and cardiovascular death.

Guideline-Directed Medical Therapy for Elderly Patients With Acute Myocardial Infarction Who Undergo Percutaneous Coronary Intervention　- Insights From a Retrospective Observational Study.

BACKGROUND: The efficacy of guideline-directed medical therapy (GDMT) in the elderly remains unclear. This study evaluated the impact of GDMT (aspirin or a P2Y12inhibitor, angiotensin-converting enzyme inhibitor or angiotensin receptor blocker, ß-blocker, and statin) at discharge on long-term mortality in elderly patients with acute myocardial infarction (AMI) who had undergone percutaneous coronary intervention (PCI).Methods and Results: Of 2,547 consecutive patients with AMI undergoing PCI in 2009-2020, we retrospectively analyzed 573 patients aged ≥80 years. The median follow-up period was 1,140 days. GDMT was prescribed to 192 (33.5%) patients at discharge. Compared with patients without GDMT, those with GDMT were younger and had higher rates of ST-segment elevation myocardial infarction and left anterior descending artery culprit lesion, higher peak creatine phosphokinase concentration, and lower left ventricular ejection fraction (LVEF). After adjusting for confounders, GDMT was independently associated with a lower cardiovascular death rate (hazard ratio [HR] 0.35; 95% confidence interval [CI] 0.16-0.81), but not with all-cause mortality (HR 0.77; 95% CI 0.50-1.18). In the subgroup analysis, the favorable impact of GDMT on cardiovascular death was significant in patients aged 80-89 years, with LVEF <50%, or with an estimated glomerular filtration rate ≥30 mL/min/1.73 m2. CONCLUSIONS: GDMT in patients with AMI aged ≥80 years undergoing PCI was associated with a lower cardiovascular death rate but not all-cause mortality.

Impact of myocardial bridging on coronary artery plaque formation and long-term mortality after heart transplantation.

OBJECTIVES: This study aimed to explore the impact of myocardial bridging (MB) on early development of cardiac allograft vasculopathy and long-term graft survival after heart transplantation. BACKGROUND: MB has been reported to be associated with acceleration of proximal plaque development and endothelial dysfunction in native coronary atherosclerosis. However, its clinical significance in heart transplantation remains unclear. METHODS: In 103 heart-transplant recipients, serial (baseline and 1-year post-transplant) volumetric intravascular ultrasound (IVUS) analyses were performed in the first 50 mm of the left anterior descending (LAD) artery. Standard IVUS indices were evaluated in 3 equally divided LAD segments (proximal, middle, and distal segments). MB was defined by IVUS as an echolucent muscular band lying on top of the artery. The primary endpoint was death or re-transplantation, assessed for up to 12.2 years (median follow-up: 4.7 years). RESULTS: IVUS identified MB in 62% of the study population. At baseline, MB patients had smaller intimal volume in the distal LAD than non-MB patients (p = 0.002). During the first year, vessel volume decreased diffusely irrespective of the presence of MB. Intimal growth diffusely distributed in non-MB patients, whereas MB patients demonstrated significantly augmented intimal formation in the proximal LAD. Kaplan-Meier analysis revealed significantly lower event-free survival in patients with versus without MB (log-rank p = 0.02). In multivariate analysis, the presence of MB was independently associated with late adverse events [hazard ratio 5.1 (1.6-22.2)]. CONCLUSION: MB appears to relate to accelerated proximal intimal growth and reduced long-term survival in heart-transplant recipients.

Calcium Fracture After Intravascular Lithotripsy as Assessed With Optical Coherence Tomography.

BACKGROUND: Plaque characteristics associated with effective intravascular lithotripsy (IVL) treatment of calcification have not been investigated. This study identified calcified plaque characteristics that favor the use of IVL.Methods and Results: Optical coherence tomography (OCT) was performed in 16 calcified lesions in 16 patients treated with IVL and coronary stenting. Cross-sectional OCT images in 262 segments matched across pre-IVL, post-IVL, and post-stenting time points were analyzed. After IVL, 66 (25%) segments had calcium fracture. In multivariable analysis, calcium arc (odds ratio [OR] 1.22; 95% confidence interval [CI] 1.13-1.32; P<0.0001), superficial calcification (OR 6.98; 95% CI 0.07-55.57; P=0.0182), minimum calcium thickness (OR 0.66; 95% CI 0.51-0.86; P=0.0013), and nodular calcification (OR 0.24; 95% CI 0.08-0.70; P=0.0056) were associated with calcium fracture. After stenting, stent area was larger for segments with fracture (8.0 [6.9-10.6] vs. 7.1 [5.2-8.9] mm2; P=0.004). CONCLUSIONS: Post-IVL calcium fracture is more likely in calcified lesions with lower thickness, a larger calcium arc, superficial calcification, and non-nodular calcification, leading to a larger stent area.

Heterogeneous vascular response after implantation of bare nitinol self-expanding stents in the swine femoropopliteal artery.

BACKGROUND: Mechanism of femoropopliteal in-stent restenosis has been underappreciated. AIM: The aim of this animal study was to elucidate vascular response after femoropopliteal bare nitinol self-expanding stents (SESs) implantation. METHODS: Misago, Smart Flex, or Innova stent was randomly implanted in 36 swine femoropopliteal arteries. At week 4, quantitative vessel analysis (QVA) was performed on 36 legs, of which 18 underwent histological evaluation after angiography. The remaining 18 legs underwent QVA and histological evaluation at week 13. RESULTS: Fibrin deposition was excessive at week 4. Internal elastic lamina (IEL) progressively enlarged over time, and vessel injury developed from mild level at week 4 to moderate level at week 13. Vessel inflammatory reaction was mild to moderate at week 4, and was moderate to severe at week 13. Increased fibrin deposition was an early-acting, IEL enlargement and increased vessel inflammation were long-acting, and increased vessel injury and giant cells infiltration were late-acting contributors to neointimal hyperplasia (NIH). Stent type altered time-dependent process of vessel injury, vessel inflammation, eosinophils and giant cells infiltration. Misago had less fibrin deposition and vessel enlargement, and less progressive vessel injury, vessel inflammation, and eosinophils and giant cells infiltration. Net lumen as assessed by percent diameter stenosis or minimum lumen diameter was preserved with Misago, but was not preserved with the other stents. CONCLUSIONS: In the context of bare nitinol SES platform with less progressive mechanical stress and inflammatory reaction, the advantage of less NIH outweighed the disadvantage of less vessel enlargement, leading to net lumen preservation.

Intra- and Postprocedural Management of Coronary Artery Perforation During Percutaneous Coronary Intervention.

Background: Little is known regarding the postprocedural management of coronary artery perforation (CAP). Methods and Results: The characteristics, outcomes, and management of 115 CAP cases among 13,453 patients undergoing percutaneous coronary intervention (PCI) between 2001 and 2017 at Miyazaki Medical Association Hospital were analyzed retrospectively. The incidence of CAP was 0.85% (25 [0.19%] coronary ruptures [CRs], 90 [0.67%] wire perforations [WPs]). The most prevalent causes of CRs and WPs were rotational atherectomy (36.0%) and polymer-jacketed wires (41.1%), respectively. Fifty-two percent of CRs were treated using prolonged balloon inflation, whereas 50% of WPs were treated through embolization. Immediate and delayed cardiac tamponade (CT) occurred in 20% and 24% of CRs, respectively, and in 2.2% and 10% of WPs, respectively. The mean (±SD) right atrial pressure (RAP) during delayed CT in the CR and WP groups was 16.0±1.2 and 14.0±3.0 mmHg, respectively. New-onset atrial fibrillation developed in 24.0% and 11.1% of patients in the CR and WP groups, respectively, whereas late-onset coronary artery aneurysm (CAA) occurred in 24.0% and 0% of patients, respectively. One-year mortality rates in patients with immediate and delayed CT were 28.6% and 20.0%, respectively. Conclusions: Special attention should be paid to delayed CT, new-onset atrial fibrillation, and late-onset CAA after CAP treatment. Continuous monitoring of RAP after CAP during PCI may be useful for the early detection of delayed CT.

Outcomes of Elderly Patients With Acute Myocardial Infarction and Heart Failure Who Undergo Percutaneous Coronary Intervention.

Background: As life expectancy rises, percutaneous coronary intervention (PCI) is being performed more frequently, even in elderly patients with acute myocardial infarction (AMI). This study evaluated outcomes of elderly patients with AMI complicated by heart failure (AMIHF), as defined by Killip Class ≥2 at admission, who undergo PCI. Methods and Results: We retrospectively analyzed 185 patients with AMIHF aged ≥80 years (median age 85 years) who underwent PCI between 2009 and 2019. The median follow-up period was 572 days. The rates of in-hospital major bleeding (Bleeding Academic Research Consortium Type 3 or 5) and in-hospital all-cause mortality were 20.5% and 25.9%, respectively. The proportion of frail patients increased during hospitalization, from 40.6% at admission to 59.2% at discharge (P<0.01). The cumulative incidence of all-cause mortality was 36.3% at 1 year and 44.1% at 2 years. After adjusting for confounders, advanced age, Killip Class 4, final Thrombolysis in Myocardial Infarction flow grade <3, and longer door-to-balloon time were associated with higher mortality, whereas higher left ventricular ejection fraction and cardiac rehabilitation were associated with lower mortality (all P<0.05). Progression of frailty during hospitalization was an independent risk factor for long-term mortality in hospital survivors (P<0.01). Conclusions: The management of patients with AMIHF aged ≥80 years who undergo PCI remains challenging, with high rates of in-hospital major bleeding, frailty progression, and mortality.

Dynamic changes in the three-dimensional mitral complex geometry in a case of takotsubo cardiomyopathy with transient systolic anterior movement of the mitral valve.

A 57-year-old female presented to us with takotsubo cardiomyopathy. Echocardiogram revealed systolic anterior movement of the mitral valve (SAM) and severe mitral regurgitation (MR) with left ventricular (LV) dysfunction. After intensive medical treatment, SAM and MR almost disappeared along with the restoration of LV wall motion abnormality. We quantitatively analyzed three-dimensional mitral complex geometry at the acute phase and the recovery phase. At the initial examination when the transient SAM was observed, annulus diameters and area were significantly smaller, compared with the recovery phase. Excessive systolic movement of the annulus along with hyperdynamic LV basal wall may contribute to the transient SAM with severe MR. Learning objective: Recent studies have suggested systolic anterior movement of the mitral valve (SAM) causes acute mitral regurgitation in patients with takotsubo cardiomyopathy. However, the mechanism of transient SAM in Takotsubo cardiomyopathy remains unclear. This is the first report that assessed the unique geometric mechanisms of transient SAM in Takotsubo cardiomyopathy.

Colocalization of Coronary Plaque with Wall Shear Stress in Myocardial Bridge Patients.

PURPOSE: Patients with myocardial bridges (MBs) have a higher prevalence of atherosclerosis. Wall shear stress (WSS) has previously been correlated with plaque in coronary artery disease patients, but such correlations have not been investigated in symptomatic MB patients. The aim of this paper was to use a multi-scale computational fluid dynamics (CFD) framework to simulate hemodynamics in MB patient, and investigate the co-localization of WSS and plaque. METHODS: We identified N = 10 patients from a previously reported cohort of 50 symptomatic MB patients, all of whom had plaque in the proximal vessel. Dynamic 3D models were reconstructed from coronary computed tomography angiography (CCTA), intravascular ultrasound (IVUS) and catheter angiograms. CFD simulations were performed to compute WSS proximal to, within and distal to the MB. Plaque was quantified from IVUS images in 2 mm segments and registered to CFD model. Plaque area was compared to absolute and patient-normalized WSS. RESULTS: WSS was lower in the proximal segment compared to the bridge segment (6.1 ± 2.9 vs. 16.0 ± 7.1 dynes/cm2, p value < 0.01). Plaque area and plaque burden measured from IVUS peaked at 1-3 cm proximal to the MB entrance, coinciding with the first diagonal branch. Normalized WSS showed a statistically significant moderate correlation with plaque area (r = 0.41, p < 0.01). CONCLUSION: WSS may be obtained non-invasively in MB patients and provides a surrogate marker of plaque area. Using CFD, it may be possible to non-invasively assess the extent of plaque area, and identify patients who could benefit from frequent monitoring or medical management.

Microcirculatory Resistance Predicts Allograft Rejection and Cardiac Events After Heart Transplantation.

BACKGROUND: Single-center data suggest that the index of microcirculatory resistance (IMR) measured early after heart transplantation predicts subsequent acute rejection. OBJECTIVES: The goal of this study was to validate whether IMR measured early after transplantation can predict subsequent acute rejection and long-term outcome in a large multicenter cohort. METHODS: From 5 international cohorts, 237 patients who underwent IMR measurement early after transplantation were enrolled. The primary outcome was acute allograft rejection (AAR) within 1 year after transplantation. A key secondary outcome was major adverse cardiac events (MACE) (the composite of death, re-transplantation, myocardial infarction, stroke, graft dysfunction, and readmission) at 10 years. RESULTS: IMR was measured at a median of 7 weeks (interquartile range: 3-10 weeks) post-transplantation. At 1 year, the incidence of AAR was 14.4%. IMR was associated proportionally with the risk of AAR (per increase of 1-U IMR; adjusted hazard ratio [aHR]: 1.04; 95% confidence interval [CI]: 1.02-1.06; p < 0.001). The incidence of AAR in patients with an IMR ≥18 was 23.8%, whereas the incidence of AAR in those with an IMR <18 was 6.3% (aHR: 3.93; 95% CI: 1.77-8.73; P = 0.001). At 10 years, MACE occurred in 86 (36.3%) patients. IMR was significantly associated with the risk of MACE (per increase of 1-U IMR; aHR: 1.02; 95% CI: 1.01-1.04; P = 0.005). CONCLUSIONS: IMR measured early after heart transplantation is associated with subsequent AAR at 1 year and clinical events at 10 years. Early IMR measurement after transplantation identifies patients at higher risk and may guide personalized posttransplantation management.

Prognostic value of comprehensive intracoronary physiology assessment early after heart transplantation.

AIMS: We evaluated the long-term prognostic value of invasively assessing coronary physiology after heart transplantation in a large multicentre registry. METHODS AND RESULTS: Comprehensive intracoronary physiology assessment measuring fractional flow reserve (FFR), the index of microcirculatory resistance (IMR), and coronary flow reserve (CFR) was performed in 254 patients at baseline (a median of 7.2 weeks) and in 240 patients at 1 year after transplantation (199 patients had both baseline and 1-year measurement). Patients were classified into those with normal physiology, reduced FFR (FFR ≤ 0.80), and microvascular dysfunction (either IMR ≥ 25 or CFR ≤ 2.0 with FFR > 0.80). The primary outcome was the composite of death or re-transplantation at 10 years. At baseline, 5.5% had reduced FFR; 36.6% had microvascular dysfunction. Baseline reduced FFR [adjusted hazard ratio (aHR) 2.33, 95% confidence interval (CI) 0.88-6.15; P = 0.088] and microvascular dysfunction (aHR 0.88, 95% CI 0.44-1.79; P = 0.73) were not predictors of death and re-transplantation at 10 years. At 1 year, 5.0% had reduced FFR; 23.8% had microvascular dysfunction. One-year reduced FFR (aHR 2.98, 95% CI 1.13-7.87; P = 0.028) and microvascular dysfunction (aHR 2.33, 95% CI 1.19-4.59; P = 0.015) were associated with significantly increased risk of death or re-transplantation at 10 years. Invasive measures of coronary physiology improved the prognostic performance of clinical variables (χ2 improvement: 7.41, P = 0.006). However, intravascular ultrasound-derived changes in maximal intimal thickness were not predictive of outcomes. CONCLUSION: Abnormal coronary physiology 1 year after heart transplantation was common and was a significant predictor of death or re-transplantation at 10 years.

Impact of Diastolic Vessel Restriction on Quality of Life in Symptomatic Myocardial Bridging Patients Treated With Surgical Unroofing: Preoperative Assessments With Intravascular Ultrasound and Coronary Computed Tomography Angiography.

[Figure: see text].

Head-to-head comparison of quantitative measurements between intravascular imaging systems: An in vitro phantom study.

INTRODUCTION: The present study aimed to compare the accuracy of quantitative measurements by contemporary intravascular imaging systems including optical frequency domain imaging (OFDI), frequency domain optical coherence tomography (FD-OCT), and 6 intravascular ultrasound (IVUS) systems. METHODS: We imaged five cylindrical phantom models made from an acrylic resin with known lumen diameters (1.51, 2.03, 3.04, 4.04, and 5.04 mm, respectively) using OFDI (FastView and LUNAWAVE, Terumo), FD-OCT (Dragonfly JP and ILUMIEN OPTIS, Abbott Vascular), and 6 mechanically rotating IVUS systems including a system, two 40-MHz, one 45-MHz, two 60-Mhz and one broad-band frequency IVUS systems. The OFDI, FD-OCT, and IVUS images were obtained using automated motorized pullback in a tank filled with 37-degree Celsius saline and, in cases of OFDI and FD-OCT, contrast-saline mixture (1:1 ratio) and contrast under the system setting of the refractive index for the corresponding flush medium. RESULTS: All the imaging systems showed good accuracy and excellent precision of lumen measurement with the relative differences between the measured diameter and actual phantom diameter being ranging from -2.9% to 8.0% and minimum standard deviations of the measured diameters (≤0.02 mm). CONCLUSION: The present study demonstrated that contemporary intravascular imaging systems including OFDI, FD-OCT, and IVUS provided clinically acceptable accuracy and excellent precision of quantitative lumen measurement in phantom models in vitro across a wide range of dimensions. Future research to confirm these findings in vivo are warranted.

Non-rheumatic giant left atrium: An illustrative case successfully treated by surgical intervention.

A 45-year-old male presented to us with decompensated heart failure. He had been diagnosed as having atrial fibrillation when he was 31 years old. Transthoracic and transesophageal echocardiography revealed an excessive left atrial (LA) enlargement with left ventricular dysfunction and severe functional mitral regurgitation. There were no specific findings of rheumatic valve disease. He underwent surgical mitral valve replacement and LA volume reduction surgery after optimal medical therapy. Surgically-removed specimens of the LA and the anterior mitral leaflet were examined and there were no specific histopathological findings suggesting the specific etiology of the giant LA in this patient. The patient's condition significantly improved after the surgery without any cardiac events ever since. .