Mortality Associated With Proportionality of Secondary Mitral Regurgitation After Transcatheter Mitral Valve Repair: North American Mitraclip for Functional Mitral Regurgitation Registry.

The association, if any, between the effective regurgitant orifice area (EROA) to left ventricular end-diastolic volume (LVEDV) ratio and 1-year mortality is controversial in patients who undergo mitral transcatheter edge-to-edge repair (m-TEER) with the MitraClip system (Abbott Vascular, Santa Clara, CA). This study's objective was to determine the association between EROA/LVEDV and 1-year mortality in patients who undergo m-TEER with MitraClip. In patients with severe secondary (functional) mitral regurgitation (MR), we analyzed registry data from 11 centers using generalized linear models with the generalized estimating equations approach. We studied 525 patients with secondary MR who underwent m-TEER. Most patients were male (63%) and were New York Heart Association class III (61%) or IV (21%). Mitral regurgitation was caused by ischemic cardiomyopathy in 51% of patients. EROA/LVEDV values varied widely, with median = 0.19 mm2/ml, interquartile range [0.12,0.28] mm2/ml, and 187 patients (36%) had values <0.15 mm2/ml. Postprocedural mitral regurgitation severity was substantially alleviated, being 1+ or less in 74%, 2+ in 20%, 3+ in 4%, and 4+ in 2%; 1-year mortality was 22%. After adjustment for confounders, the logarithmic transformation (Ln) of EROA/LVEDV was associated with 1-year mortality (odds ratio 0.600, 95% confidence interval 0.386 to 0.933, p = 0.023). A higher Society of Thoracic Surgeons risk score was also associated with increased mortality. In conclusion, lower values of Ln(EROA/LVEDV) were associated with increased 1-year mortality in this multicenter registry. The slope of the association is steep at low values but gradually flattens as Ln(EROA/LVEDV) increases.

Transcatheter Mitral Valve Repair for Severe,Symptomatic Mitral Regurgitation in Patients with Left Ventricular Assist Devices.

Patients with symptomatic stage D heart failure who require left ventricular assist device (LVAD) support and suffer concomitant severe mitral regurgitation are often difficult to manage. One reason is due to cardiac anatomic constraints that limit optimization of the mechanical assist device. Typically, these patients are not candidates for repeat sternotomy with surgical mitral valve repair, and heart transplantation may not be feasible or timely. This case describes two patients with LVAD support who received transcatheter edge-to-edge mitral valve repair for severe, symptomatic mitral regurgitation. We believe this procedure may be a therapeutic option in stable patients with severe mitral regurgitation who require mechanical support.

Initial experience with the fourth generation MitraClip™: Outcomes, procedural aspects, and considerations for device selection.

OBJECTIVES: We present our initial experience with the fourth-generation MitraClip™ (G4) system and propose preliminary criteria for device selection. BACKGROUND: The MitraClip™ G4 system recently underwent a "controlled release" for transcatheter edge-to-edge mitral valve repair. The four new devices include technical improvements such as controlled gripper actuation (independent leaflet capture) and continuous left atrial pressure monitoring. To date, a patient-specific device selection algorithm, and the technology's impact on procedural times and success, have not been described. METHODS: We present an initial multi-center experience and short-term outcomes with the new system, suggest procedural and imaging considerations, and propose initial guidance for device selection. RESULTS: Sixty-one procedures performed by three operators at two centers between November 2019 and May 2020 were analyzed. At 30-day follow-up, there were three deaths (4.9%), four neurological events (6.6%), and seven re-hospitalizations (11.5%). Fifty-nine patients achieved device and procedural success (96.7%), and there was one device-related technical issue (1.6%). Compared to the same operators utilizing the third generation MitraClip™, the G4 system resulted in a significant reduction in the median number of clips used per patient (1 IQR 1-2 vs. 2 IQR 1-3, p = .023) and a trend toward shorter device times. CONCLUSION: Based on our initial experience, we found that the MitraClip™ G4 system is associated with high procedural success and fewer devices needed per procedure. The expanded device options may allow a more targeted approach to the myriad of pathologic presentations of mitral regurgitation. This early experience should provide a foundational opportunity for further refinement.

Rise and fall of preoperative coronary revascularization.

INTRODUCTION: About 234 million major surgical procedures are performed each year worldwide, of which >60 million surgeries are performed in the United States. Though postoperative major adverse cardiac complications are relatively low, patients with postoperative myocardial infarction have higher in-hospital mortality. Thus, comprehensive cardiac evaluations, and in some cases, elective coronary revascularizations, are performed prior to surgery with an intent to minimize these complications. In 2009, approximately 4% of all elective percutaneous coronary interventions were performed in preparation for noncardiac surgery. AREAS COVERED: We discuss relevant articles from the last 50 years regarding elective preoperative coronary revascularization prior to noncardiac surgery. EXPERT OPINION: In the early years there was an interest in preemptive revascularization to reduce postoperative cardiac events; however, subsequent studies in patients with stable coronary artery disease have mostly shown that a strategy of routine prophylactic coronary revascularization prior to noncardiac surgery does not reduce postoperative cardiac complications.

First-in-human report of MitraClip G4 implantation for severe degenerative mitral regurgitation.

The new MitraClip G4 device (Abbott Vascular) has been recently approved by Food and Drug Administration and is currently in limited release. A patient with a large mitral regurgitation (MR) jet but a relatively small mitral valve area (MVA) was not a surgical repair candidate nor an optimal MitraClip third-generation device candidate. Therefore, we implanted the new G4 NTW device that resulted in significant MR reduction with a 57% reduction in MVA. To our knowledge, this is the first reported clinical use of the MitraClip G4 NTW device. We find that it may provide better results than a single NTR device and less reduction in MVA than two older generation devices. Further experience is needed to optimize patient selection for the four new G4 devices available.

Axillary Impella insertion under regional nerve block: A case report.

Percutaneous coronary interventions with the Impella (Abiomed, MA) catheter-based, micro-axial mechanical left ventricular assist device is a safe option for patients undergoing higher risk interventions. However, severe peripheral arterial disease limits vascular access for Impella insertion. Upper extremity arterial access has been traditionally obtained under general anesthesia. We present the first case, to our knowledge, of using peripheral nerve blocks for Impella 3.5 CP insertion into the axillary artery.

Radiation-Induced Cardiovascular Disease.

PURPOSE OF REVIEW: Thoracic radiation therapy is an effective treatment for several malignancies, such as Hodgkin's lymphoma and breast cancer. Over the years, however, the incidence of cardiovascular events has increased in these patients, notably in younger survivors who do not have traditional risk factors. This review summarizes the pathology, incidence, clinical presentation, and management of cardiac events after radiation therapy. RECENT FINDINGS: Mediastinal radiation therapy accelerates the atherosclerosis process, resulting in early onset coronary artery disease. Valvular disease due to radiation therapy typically affects the left-sided valves, with aortic regurgitation being the most common. Rarely, it may lead to aortic stenosis requiring surgical interventions. Pericardial involvement includes acute and chronic pericardial disease and pericardial effusion. New studies are investigating the prevalence and pathogenesis of autonomic dysfunction in cancer survivors who have undergone mediastinal and neck radiation. Radiation therapy itself causes vascular endothelial dysfunction, resulting in clinical cardiovascular events, manifesting many years after completion of therapy. There remains little guidance regarding screening and therapies to prevent cardiovascular events in this population.

Prevalence and outcomes of intermediate saphenous vein graft lesions: findings from the stenting of saphenous vein grafts randomized-controlled trial.

BACKGROUND: We sought to examine the prevalence and progression rate of intermediate saphenous vein graft (SVG) lesions in the Stenting Of Saphenous vein grafts (SOS) trial. METHODS: The baseline and follow-up angiograms of 80 patients participating in the SOS trial were analyzed to determine the prevalence of intermediate (30-60% angiographic diameter stenosis) SVG lesions and their progression rate. RESULTS: At least one intermediate SVG lesion was present in 31 of 143 (22%) SVGs in 27 of 80 (34%) patients. Most intermediate lesions were present in the SOS stented SVGs (20 grafts in 19 patients). During a median follow-up of 35 months, angiographic follow-up was available for 28 grafts in 25 patients. Progression (defined as percent diameter stenosis ≥ 70% but <100% at follow-up angiography) was seen in 11 of 28 SVGs (39%) in 11 of 25 patients (44%). Progression rate at 12, 24 and 36 months was 28% and 47% and 84%, respectively. Seven of 11 patients (64%) with intermediate SVG lesion progression presented with an acute coronary syndrome and 8 (73%) underwent PCI. Four of the 28 grafts with intermediate lesions at baseline were 100% occluded at follow-up; all of those SVGs had received a stent in another location in the SVG as part of the SOS trial. CONCLUSIONS: Intermediate SVG lesions are common in patients undergoing SVG stenting, have high rates of progression and frequently present with an acute coronary syndrome. Further study of pharmacologic and mechanical treatments to prevent progression of these lesions is needed.

Paclitaxel-eluting stents reduce neointimal hyperplasia compared to bare metal stents in saphenous vein grafts: intravascular ultrasonography analysis of the SOS (Stenting of Saphenous Vein Grafts) trial.

AIMS: To compare the intravascular ultrasonography (IVUS) findings between saphenous vein grafts (SVG) treated with paclitaxel-eluting stents (PES) vs. bare metal stents (BMS) in the Stenting Of Saphenous Vein Grafts (SOS) trial. METHODS AND RESULTS: Of the 80 SOS trial patients, 38 had both baseline and follow-up IVUS examination and were included in this substudy: 17 patients received 28 BMS in 26 lesions and 21 patients received 30 PES in 28 lesions. Quantitative IVUS analysis was performed to determine the volume of in-stent neointimal hyperplasia (NIH) - defined as the difference between stent volume and lumen volume in the stented segments. Baseline characteristics were similar between patients who did and did not undergo baseline and follow-up IVUS. Patients receiving BMS and PES had similar stent and lumen volumes immediately after stenting. At 12-month follow-up, compared to BMS, PES-treated lesions had significantly less NIH volume (3.4 vs. 21.9 mm³, p<0.001) and neointima hyperplasia progression (1.6 vs. 17.1 mm³, p<0.001). No significant differences were seen in the 5 mm segment proximal and distal to the stent. CONCLUSIONS: Compared to BMS, use of PES in SVG lesions is associated with significantly lower NIH formation, which may help explain the improved clinical outcomes with PES in these lesions.

Relation between the presence and extent of coronary lipid core plaques detected by near-infrared spectroscopy with postpercutaneous coronary intervention myocardial infarction.

We aimed to examine whether an association exists between the presence and extent of coronary lipid core plaques (LCPs) detected by near-infrared spectroscopy (NIRS) performed before percutaneous coronary intervention (PCI) with postprocedural myocardial infarction (MI). NIRS was performed in the native coronary arteries of 30 patients before PCI. Angular extent of LCP, lesion segment lipid core burden index, and block chemogram were evaluated. Cardiac biomarkers were measured before and 16 to 24 hours after PCI to determine occurrence of postprocedural MI. Mean number of 2-mm yellow blocks within the stented lesion was 1.4 ± 2.1 and mean lesion lipid core burden index was 110.3 ± 99. Using a definition of creatine kinase-MB >1 time upper limit of normal (ULN), >2 times ULN, and >3 times ULN, MI after PCI occurred in 23%, 13%, and 10% of patients, respectively. Compared to patients who did not have MI after PCI, those who did had similar clinical characteristics but received more stents and had more blocks within the stented lesion. Creatine kinase-MB increase >3 times ULN was observed in 27% of patients with ≥1 yellow block versus in none of the patients without a yellow block within the stented lesion (p = 0.02). In conclusion, PCI of LCP-positive lesions as assessed by NIRS is associated with increased risk for MI after PCI. NIRS may allow lesion-specific risk stratification before PCI and optimization of PCI strategies for myocardial injury risk minimization.