Comparison between Track Technique and Conventional Approach for Measuring Artificial Chordae in the Treatment of Anterior Leaflet Prolapse and Flail during Mitral Valve Repair.

Background: Measuring the chordae tendineae for mitral valve reconstruction is feasible with various techniques. However, the effect of different strategies on the durability of plastics at follow-up is unknown. The study aims to compare a conventional surgical technique for measuring artificial chordae length with our new approach, defined "track technique". Methods: We compared the results of patients with anterior leaflet prolapse/flail who underwent mitral valve reconstruction by implanting artificial chordae from January 2020 to January 2022; 22 patients were operated on with a conventional technique, and 25 with our new alternative, "track technique". Clinical and transesophageal echocardiography data were collected postoperatively and at 2 years of follow-up. The primary outcome was freedom from mitral regurgitation. Secondary outcomes were presentation with New York Heart Association (NYHA) class < 2 and leaflet coaptation length ≥ 10 mm. Results: The patients of the 2 groups had comparable preoperative risk factors regarding the LogEuroSCORE (p = 0.33). Moreover, no difference was observed in terms of the mechanism of mitral valve insufficiency. No hospital or follow-up deaths were recorded for either group. At discharge, no echocardiographic differences were observed in the regarding degree of residual mitral regurgitation, but the measurement of coaptation length was in favor of the alternative group (8.6 ± 1.8 vs. 11 ± 1.4; p = 0.04). At 2 years of follow-up (25 ± 9; range 13-37), the NYHA class was not different; however, the number of patients with 1-2+ recurrent mitral regurgitation was significantly higher in the conventional group (8 vs. 4 patients; p = 0.02), and the coaptation length was in favor of the alternative group (8.8 ± 1.7 vs. 11 ± 1.7; p = 0.04). Conclusions: We devised both techniques to prove effective in achieving good valvular continence, but a significantly greater coaptation length was obtained with our track technique at the 2 years follow-up.

Aortic valve and vascular calcium score in pre-TAVI CT: correlation with early post-procedural complications.

PURPOSE: The aim of our study was to evaluate the prevalence of early complications after Transcatheter Aortic Valve Implantation (TAVI) and their correlation with the Calcium Score (CS) of the aortic valve, aorta and ilio-femoral arteries derived from pre-procedural computed tomography (CT). MATERIALS AND METHODS: We retrospectively reviewed 226 patients (100 males, mean age 79.4 ± 6.7 years) undergoing 64-slice CT for pre-TAVI evaluation from January 2018 to April 2021. The population was divided into CS quartiles. RESULTS: Overall, 173 patients underwent TAVI procedure, of whom 61% presented paravalvular leak after the procedure, 28% presented bleeding or vascular complications, 25% presented atrioventricular block, and 8% developed acute kidney injury. The prevalence of paravalvular leak and vascular complications was higher in the upper CS quartiles for aortic valve and ilio-femoral arteries. CONCLUSIONS: Aortic valve and vascular CS could help to predict post-TAVI early complications.

Commentary to: "Comparing midterm outcomes" of Cox-Maze procedure and pulmonary vein isolation for atrial fibrillation after concomitant mitral valve surgery: A "systematic review".

There is no solid evidence from the literature that compare Cox-Maze with pulmonary vein isolation techniques for atrial fibrillation in the context of concomitant mitral valve surgery. Although the first is perhaps more effective and linked to higher freedom from atrial fibrillation, it is more invasive compared to the pulmonary isolation.

No need to treat atrial fibrillation. An unexpected perspective.

Heart failure and atrial fibrillation are often associated. Both conditions share pathophysiology and risk factor, an example, atrial fibrillation may be regarded as either the "cause" or the "consequence" of heart failure. If coexistent, they are associated to very poor outcome. With this in mind, finding effective therapy for patients presenting with both heart failure and atrial fibrillation remains of paramount importance. There are also little evidence of the role and benefit of surgical atrial fibrillation ablation concomitant to heart surgery (i.e., coronary or valve surgery).

Shedding some light on tricuspid intervention.

BACKGROUND: More than 1.6 million Americans have at least moderate to severe valvular tricuspid regurgitation, yet fewer than 8000 tricuspid valve operations are performed annually in the USA. The undertreatment for isolated tricuspid regurgitation might be related to the fact that in the past years no clear guidelines on 'how' and 'when' to treat tricuspid regurgitation were issued. AIMS: Sarris-Michopoulos and colleagues carried out a meta-analysis with the aim to investigate the role of tricuspid valve repair versus tricuspid valve replacement in patients with isolated tricuspid valve regurgitation. MATERIAL AND METHODS: Outcomes of patients with first-time surgery for isolated tricuspid valve regurgitation without previous left-sided valve surgery were reviewed. Ten studies were included with a total of 1407 patients. RESULTS: Authors concluded that patients who underwent tricuspid valve repair showed less 30-days mortality than replacement along with a reduced need for post-operaitve permanent pacemaker implantation rate. DISCUSSION: Decision on whether to treat or not tricuspid valve is demanding, particularly in the context of the newest percutaneous technologies. Before intervention, careful evaluation of both tricuspid valve and right ventricle must be performed. Nevertheless, intervention, should not be deferred when clinically indicated. CONCLUSIONS: The findings form this meta-analysis suggest that reparative surgery, perhaps in an early stage, may be beneficial in selected cohort of patients.

Mitral valve repair: Regulatory or ethical problem?

The long-term outcome of patients undergoing mitral valve repair (MVr) is based on what happens during the more or less 60 min of aortic cross-clamping necessary to transform a leaking valve into a well-functioning one. As a consequence, the experience of the surgeon performing the procedure is the only determinant of the success rate that deserves to be taken into account. It is clear from the literature that the number of cases/year is inversely related to the number of early and late deaths, repair failures, and reoperations. However, there is no agreement on the minimum caseload/year that represents the threshold to identify surgeons that can perform or not MVr. This problem then cannot be regulated by specific guidelines of Scientific Societies, but only by the ethical perception, we have of our profession.

Functional anatomy and echocardiographic assessment in secondary mitral regurgitation.

BACKGROUND: Mitral valve apparatus is complex and involves the mitral annulus, the leaflets, the chordae tendinae, the papillary muscles as well as the left atrial and ventricular myocardium. Secondary mitral regurgitation is a consequence of regional or global left ventricle remodeling due to an acute myocardial infarction (75% of cases) or idiopathic dilated cardiomyopathy (25% of cases). It is associated with an increase in mortality and poor outcome. There is a potential survival benefit deriving from the reduction in the degree of severity of mitral regurgitation. So the correction of the valve defect can change the clinical course and prognosis of the patient. The rationale for mitral valve treatment depends on the mitral regurgitation mechanism. Therefore, it is essential to identify and understand the pathophysiology of mitral valve regurgitation. AIM OF THE STUDY: The aim of this review is to describe the crucial role of transthoracic and trans-esophageal echocardiography, in particular with three-dimensional echocardiography, for the assessment of the severity of secondary mitral regurgitation, anatomy, and hemodynamic changes in the left ventricle. Moreover, the concept that the mitral valve has no organic lesions has been abandoned. The echocardiography must allow a complete anatomical and functional evaluation of each component of the mitral valve complex, also useful to the surgeon in choosing the best surgical approach to repair the valve. CONCLUSIONS: Echocardiography is the first-line imaging modality for a better selection of patients, according to geometrical modifications of mitral apparatus and left ventricle viability, especially in preoperative phase.

The influence of metabolic syndrome in heart valve intervention. A multi-centric study.

BACKGROUND: The effect of metabolic syndrome (MetS), defined as insulin resistance along with two or more of: obesity, atherogenic dyslipidaemia and elevated blood pressure, on postoperative complications after isolated heart valve intervention remains controversial. We hypothesized that MetS may negatively influence the postoperative course in these patients. METHODS: Patients from 10 cardiac units who underwent isolated valve intervention (mitral ± $\pm $ tricuspid repair/replacement (mitral valve surgery [MVS]) or surgical aortic valve replacement (SAVR), or transcatheter aortic valve replacement (TAVR) were included. MetS was defined according to the World Health Organization criteria. Primary outcome was in-hospital mortality and overall postoperative length of stay (LOS). Relevant postoperative complications were also recorded. RESULTS: From 2010 to 2019, 17,283 patients underwent valve intervention. The MVS, SVAR, and TAVR accounted for the 39.4%, 48.2%, and 12.3% respectively of the whole. MetS compared to no-MetS was associated to higher mortality in the MVS group (6.5% vs. 2%, p < .001), but not in the SAVR and TAVR group. In both surgical cohorts, MetS was associated with increased complications including red blood cells transfusion, renal failure, mechanical ventilation time, intensive care and overall postoperative LOS (11 (9) vs. 10 (6), p < .001 and 10 (6) versus 10 (5) days, p = .002, MVS and [SAVR]). No differences were found in the TAVR cohort, with similar mortality and complications. CONCLUSION: MetS was associated to more postoperative complications, with higher mortality in the MVS group. In the TAVR cohort, postoperative complications and mortality rate did not differ between patients with and without MetS, however LOS was longer in the MetS group.

Cutting the second order chords during mitral valve repair.

The chordae tendinae connect the papillary muscles (PMs) to the mitral valve. While the first-order chordae serve to secure the leaflets to maintain valve closure and prevent mitral valve prolapse, the second-order chordae are believed to play a role in maintaining normal left ventricle size and geometry. The PMs, from where the chordae tendinae originate, function as shock absorbers that compensate for the geometric changes of the left ventricular wall. The second-order chordae connect the PMs to both trigons under tension. The tension distributed towards the second-order chordae has been demonstrate to be more than threefold that in their first-order counterpart. Cutting the second-order chordae puts all the tension on the first-order chordae, which are then closer to their rupture point. However, it has been experimentally demonstrated that the tension at which the first-order chordae break is 6.8 newtons (N), by far higher than the maximal tension reached, that is 0.4 N. Even if the clinical reports have been favorable, the importance of cutting the second-order chordae to recover curvature of the anterior leaflet and increase the coaptation length between the mitral valve leaflets has been slowly absorbed by the surgical world. Nevertheless, there are progressive demonstrations that chordal tethering affects the anterior leaflet not only in secondary, but also in primary mitral regurgitation, having a not negligible role in the long-term outcome of mitral repair.

Minimally invasive approaches to primary cardiac tumors: A systematic review and meta-analysis.

OBJECTIVE: Cardiac tumors are rare conditions. The vast majority of them are benign yet they may lead to serious complications. Complete surgical resection is the gold standard treatment and should be performed as soon as the diagnosis is made. Median sternotomy (MS) is the standard approach and provides excellent early outcomes and durable results at follow-up. However, minimally invasive (MI) is gaining popularity and its role in the treatment of cardiac tumors needs further clarification. METHODS: A systematic literature review identified 12 candidate studies; of these, 11 met the meta-analysis criteria. We analyzed outcomes of 653 subjects (294 MI and 359 MS) with random effects modeling. Each study was assessed for heterogeneity. The primary endpoints were mortality at follow-up and tumor relapse. Secondary endpoints included relevant intraoperative and postoperative outcomes; tumor size was also considered. RESULTS: There were no significant between-group differences in terms of late mortality (incidence rate ratio [IRR]: MI vs. MS, 0.98 [95% confidence interval [CI]: 0.25-3.82], p = .98). Few relapses (IRR: 1.13; CI: 0.26-4.88; p = .87) and redo surgery (IRR: 1.92; 95% CI: 0.39-9.53; p = .42) were observed in both groups; MI approach resulted in prolonged operation time but that did not influence the clinical outcomes. Tumor size did not significantly differ between groups. CONCLUSION: Both MI and MS are associated with excellent early and late outcomes with acceptable survival rate and low incidence of recurrences. This study confirms that cardiac tumor may be approached safely and radically with a MI approach.