Changes in Computed-Tomography-Derived Segmental Left Ventricular Longitudinal Strain After Transcatheter Aortic Valve Implantation.

Patients with severe aortic stenosis (AS) may show left ventricular (LV) apical longitudinal strain sparing. Transcatheter aortic valve implantation (TAVI) improves LV systolic function in patients with severe AS. However, the changes in regional longitudinal strain after TAVI have not been extensively evaluated. This study aimed to characterize the effect of the pressure overload relief after TAVI on LV apical longitudinal strain sparing. A total of 156 patients (mean age 80 ± 7 years, 53% men) with severe AS who underwent computed tomography before and within 1 year after TAVI (mean time to follow-up 50 ± 30 days) were included. LV global and segmental longitudinal strain were assessed using feature tracking computed tomography. LV apical longitudinal strain sparing was evaluated as the ratio between the apical and midbasal longitudinal strain and was defined as an LV apical to midbasal longitudinal strain ratio >1. LV apical longitudinal strain remained stable after TAVI (from 19.5 ± 7.2% to 18.7 ± 7.7%, p = 0.20), whereas LV midbasal longitudinal strain showed a significant increase (from 12.9 ± 4.2% to 14.2 ± 4.0%, p ≤0.001). Before TAVI, 88% of the patients presented with LV apical strain ratio >1% and 19% presented with an LV apical strain ratio >2. After TAVI, these percentages significantly decreased to 77% and 5% (p = 0.009, p ≤0.001), respectively. In conclusion, LV apical sparing of strain is a relatively common finding in patients with severe AS who underwent TAVI and its prevalence decreases after the afterload relief after TAVI.

Comparison of the Quantity of Calcium in the Aortic Valve and the Coronary Arteries in Men Versus Women Who Underwent Transcatheter Aortic Valve Implantation.

Several studies have shown an association between aortic stenosis (AS) and coronary atherosclerosis. This study aimed to evaluate the gender differences in aortic valve calcium (AVC) and coronary artery calcium (CAC) and the association between CAC and all-cause mortality in patients with severe AS. A total of 260 patients (80 ± 7 years, 39% men) with severe AS who were scheduled for transcatheter aortic valve implantation (TAVI) were included. AVC and CAC before TAVI were assessed by noncontrast cardiac computed tomography. Patients with coronary intervention or aortic valve replacement before cardiac computed tomography were excluded. Standard reference values of CAC score were used to classify the percentile groups and the distribution of AVC was assessed. The primary end point was all-cause mortality. In men, the AVC score was 3,911 Hounsfield units (HUs) (interquartile range [IQR] 2,525 to 5,259) and in women, 2,409 HU (IQR 1,588 to 3,359) (p <0.001). CAC score in men was 824 HU (IQR 328 to 1,855) and in women, 478 HU (IQR 136 to 962) (p <0.001). In men, the AVC score increased along with the CAC score, whereas in women, the AVC score was similar across the CAC percentile groups. During a median follow-up of 1,095 days, 59 patients (23%) died. No significant gender-difference was seen in all-cause mortality for CAC score (p = 0.187). Men with severe AS show higher AVC and CAC scores than women. Although the pattern of CAC distribution was similar between men and women, the AVC score increased along with the CAC score in men; whereas, in women, the AVC score remained similar across the various percentiles. CAC score was not associated with cumulative mortality in patients with severe AS who underwent TAVI.

Subclinical leaflet thrombosis after transcatheter aortic valve implantation: no association with left ventricular reverse remodeling at 1-year follow-up.

Hypo-attenuated leaflet thickening (HALT) of transcatheter aortic valves is detected on multidetector computed tomography (MDCT) and reflects leaflet thrombosis. Whether HALT affects left ventricular (LV) reverse remodeling, a favorable effect of LV afterload reduction after transcatheter aortic valve implantation (TAVI) is unknown. The aim of this study was to examine the association of HALT after TAVI with LV reverse remodeling. In this multicenter case-control study, patients with HALT on MDCT were identified, and patients without HALT were propensity matched for valve type and size, LV ejection fraction (LVEF), sex, age and time of scan. LV dimensions and function were assessed by transthoracic echocardiography before and 12 months after TAVI. Clinical outcomes (stroke or transient ischemic attack, heart failure hospitalization, new-onset atrial fibrillation, all-cause mortality) were recorded. 106 patients (age 81 ± 7 years, 55% male) with MDCT performed 37 days [IQR 32-52] after TAVI were analyzed (53 patients with HALT and 53 matched controls). Before TAVI, all echocardiographic parameters were similar between the groups. At 12 months follow-up, patients with and without HALT showed a significant reduction in LV end-diastolic volume, LV end-systolic volume and LV mass index (from 125 ± 37 to 105 ± 46 g/m2, p = 0.001 and from 127 ± 35 to 101 ± 27 g/m2, p < 0.001, respectively, p for interaction = 0.48). Moreover, LVEF improved significantly in both groups. In addition, clinical outcomes were not statistically different. Improvement in LVEF and LV reverse remodeling at 12 months after TAVI were not limited by HALT.

Prognostic implications of cardiac damage classification based on computed tomography in severe aortic stenosis.

AIMS: An echocardiographic staging system of severe aortic stenosis (AS) based on additional extra-valvular cardiac damage has been associated with prognosis after transcatheter aortic valve implantation (TAVI). Multidetector row computed tomography (MDCT) is key in the evaluation of AS patients undergoing TAVI and can potentially detect extra-valvular cardiac damage. This study aimed at evaluating the prognostic implications of an MDCT staging system of severe AS in patients undergoing TAVI. METHODS AND RESULTS: A total of 405 patients (80 ± 7 years, 52% men) who underwent full-beat MDCT prior to TAVI were included. The extent of cardiac damage was assessed by MDCT and classified in five categories; Stage 0 (no cardiac damage), Stage 1 (left ventricular damage), Stage 2 (left atrium and mitral valve damage), Stage 3 (right atrial damage), and Stage 4 (right ventricular damage). Twenty-seven (7%) patients were stratified as Stage 0, 96 (24%) as Stage 1, 152 (38%) as Stage 2, 78 (19%) as Stage 3, and 52 (13%) as Stage 4. During a median follow-up of 3.7 (IQR 1.7-5.5) years, 150 (37%) died. On multivariable Cox regression analysis, cardiac damage Stage 3 (HR vs. Stage 0: 4.496, P = 0.039) and Stage 4 (HR vs. Stage 0: 5.565, P = 0.020) were independently associated with all-cause mortality. CONCLUSION: The MDCT-based staging system of cardiac damage in severe AS effectively identifies the patients who are at higher risk of death after TAVI.

Prognostic implications of left atrial dilation in aortic regurgitation due to bicuspid aortic valve.

OBJECTIVE: To investigate the prognostic value of left atrial volume index (LAVI) in patients with moderate to severe aortic regurgitation (AR) and bicuspid aortic valve (BAV). METHODS: 554 individuals (45 (IQR 33-57) years, 80% male) with BAV and moderate or severe AR were selected from an international, multicentre registry. The association between LAVI and the combined endpoint of all-cause mortality or aortic valve surgery was investigated with Cox proportional hazard regression analyses. RESULTS: Dilated LAVI was observed in 181 (32.7%) patients. The mean indexed aortic annulus, sinus of Valsalva, sinotubular junction and ascending aorta diameters were 13.0±2.0 mm/m2, 19.4±3.7 mm/m2, 16.5±3.8 mm/m2 and 20.4±4.5 mm/m2, respectively. After a median follow-up of 23 (4-82) months, 272 patients underwent aortic valve surgery (89%) or died (11%). When compared with patients with normal LAVI (<35 mL/m2), those with a dilated LAVI (≥35 mL/m2) had significantly higher rates of aortic valve surgery or mortality (43% and 60% vs 23% and 36%, at 1 and 5 years of follow-up, respectively, p<0.001). Dilated LAVI was independently associated with reduced event-free survival (HR=1.450, 95% CI 1.085 to 1.938, p=0.012) after adjustment for LV ejection fraction, aortic root diameter, LV end-diastolic diameter and LV end-systolic diameter. CONCLUSIONS: In this large, multicentre registry of patients with BAV and moderate to severe AR, left atrial dilation was independently associated with reduced event-free survival. The role of this parameter for the risk stratification of individuals with significant AR merits further investigation.

Prevalence of Aortic Valve Stenosis in Patients With ST-Segment Elevation Myocardial Infarction and Effect on Long-Term Outcome.

Several studies have shown an association between aortic valve stenosis (AS), atherosclerosis and cardiovascular risk factors. These risk factors are frequently encountered in patients with ST-segment elevation myocardial infarction (STEMI). The aim of this study was to evaluate the prevalence and the prognostic implications of AS in patients presenting with STEMI. A total of 2041 patients (61 ± 12 years old, 76% male) admitted with STEMI and treated with primary percutaneous coronary intervention were included. Patients with previous myocardial infarction and previous aortic valve replacement were excluded. Echocardiography was performed at index admission. Patients were divided in 3 groups: 1) any grade of AS, 2) aortic valve sclerosis and 3) normal aortic valve. Any grade of AS was defined as an aortic valve area ≤2.0 cm2. The primary endpoint was all-cause mortality. The prevalence of AS was 2.7% in the total population and it increased with age (1%, 3%, 7% and 16%, in the patients aged <65 years, 65 to 74 years, 75 to 84 years and ≥85 years, respectively). Patients with AS showed a significantly higher mortality rate when compared to the other two groups (p < 0.001) and AS was independently associated with all-cause mortality, with a HR of 1.81 (CI 95%: 1.02 to 3.22; p = 0.04). In conclusion, AS is not uncommon in patients with STEMI, and concomitant AS in patients with first STEMI is independently associated with all-cause mortality at long-term follow up.

Moderate Aortic Stenosis in Patients With Heart Failure and Reduced Ejection Fraction.

BACKGROUND: The study investigators previously reported that moderate aortic stenosis (AS) is associated with a poor prognosis in patients with heart failure (HF) with reduced left ventricular ejection fraction (LVEF) (HFrEF). However, the respective contribution of moderate AS versus HFrEF to the outcomes of these patients is unknown. OBJECTIVES: This study sought to determine the impact of moderate AS on outcomes in patients with HFrEF. METHODS: The study included 262 patients with moderate AS (aortic valve area >1.0 and <1.5 cm2; and peak aortic jet velocity >2 and <4 m/s, at rest or after dobutamine stress echocardiography) and HFrEF (LVEF <50%). These patients were matched 1:1 for sex, age, estimated glomerular filtration rate, New York Heart Association functional class III to IV, presence of diabetes, LVEF, and body mass index with patients with HFrEF but no AS (i.e., peak aortic jet velocity <2 m/s). The endpoints were all-cause mortality and the composite of death and HF hospitalization. RESULTS: A total of 262 patients with HFrEF and moderate AS were matched with 262 patients with HFrEF and no AS. Mean follow-up was 2.9 ± 2.2 years. In the moderate AS group, mean aortic valve area was 1.2 ± 0.2 cm2, and mean gradient was 14.5 ± 4.7 mm Hg. Moderate AS was associated with an increased risk of mortality (hazard ratio [HR]: 2.98; 95% confidence interval [CI]: 2.08 to 4.31; p < 0.0001) and of the composite of HF hospitalization and mortality (HR: 2.34; 95% CI: 1. 72 to 3.21; p < 0.0001). In the moderate AS group, aortic valve replacement (AVR) performed in 44 patients at a median follow-up time of 10.9 ± 16 months during follow-up was associated with improved survival (HR: 0.59; 95% CI: 0.35 to 0.98; p = 0.04). Notably, surgical AVR was not significantly associated with improved survival (p = 0.92), whereas transcatheter AVR was (HR: 0.43; 95% CI: 0.18 to 1.00; p = 0.05). CONCLUSIONS: In this series of patients with HFrEF, moderate AS was associated with a marked incremental risk of mortality. AVR, and especially transcatheter AVR during follow-up, was associated with improved survival in patients with HFrEF and moderate AS. These findings provide support to the realization of a randomized trial to assess the effect of early transcatheter AVR in patients with HFrEF and moderate AS.

Incremental value of left ventricular global longitudinal strain in a newly proposed staging classification based on cardiac damage in patients with severe aortic stenosis.

AIMS: Cardiac damage in severe aortic stenosis (AS) can be classified according to a recently proposed staging classification. The present study investigated the incremental prognostic value of left ventricular (LV) global longitudinal strain (GLS) over stages of cardiac damage in patients with severe AS. METHODS AND RESULTS: From an ongoing registry, a total of 616 severe symptomatic AS patients with available LV GLS by speckle tracking echocardiography were selected and retrospectively analysed. Patients were categorized according to cardiac damage on echocardiography: Stage 0 (no damage), Stage 1 (LV damage), Stage 2 (mitral valve or left atrial damage), Stage 3 (tricuspid valve or pulmonary artery vasculature damage), or Stage 4 (right ventricular damage). LV GLS was divided by quintiles and assigned to the different stages. The endpoint was all-cause mortality. Over a median follow-up of 44 [24-89] months, 234 (38%) patients died. LV GLS was associated with all-cause mortality independent of stage of cardiac damage. After incorporation of LV GLS by quintiles into the staging classification, Stages 2-4 were independently associated with outcome. LV GLS showed incremental prognostic value over clinical characteristics and stages of cardiac damage. CONCLUSION: In this large single-centre cohort of severe AS patients, incorporation of LV GLS by quintiles in a novel proposed staging classification resulted in refinement of risk stratification by identifying patients with more advanced cardiac damage. LV GLS was shown to provide incremental prognostic value over the originally proposed staging classification.

Prognostic Influence of Feature Tracking Multidetector Row Computed Tomography-Derived Left Ventricular Global Longitudinal Strain in Patients with Aortic Stenosis Treated With Transcatheter Aortic Valve Implantation.

Computed tomography plays a central role in the evaluation of patients with severe aortic stenosis who underwent transcatheter aortic valve implantation (TAVI). Advances in left ventricular (LV) analysis with multidetector row computed tomography (MDCT) permit measurement of LV global longitudinal strain (GLS). The present study aimed at evaluating the association between feature tracking (FT) MDCT derived LV GLS and all-cause mortality in patients treated with TAVI. A total of 214 patients with severe aortic stenosis (51% male, 80 ± 7 years) who underwent TAVI and with dynamic MDCT data allowing LV GLS measurement with novel FT algorithm were included. LV GLS was measured at baseline and were divided according to a previously published cut-off value of LV GLS associated with all-cause mortality (≤-14% [more preserved LV systolic function] vs >-14% [more impaired LV systolic function]). Patients were followed for the occurrence of all-cause mortality. Mean FT MDCT-derived LV GLS was -12.5 ± 4%. During a median follow-up of 45 months (interquartile range: 29 to 62 months), 67 (31%) patients died. The cumulative rate of all-cause mortality for the patients with FT MDCT-derived LV GLS ≤-14% was 15% versus28% for the patients with FT MDCT-derived LV GLS >-14%, Log rank p = 0.001). FT MDCT-derived LV GLS was independently associated with all-cause mortality (hazard ratio: 0.851; 95% confidence interval: 0.772 to 0.937; p = 0.001). In conclusion, impaired FT MDCT-derived LV GLS is independently associated with all-cause mortality in patients treated with TAVI. Besides aortic valve area and calcification, FT MDCT-derived LV GLS is an important prognostic marker.

Prognostic Implications of Renal Dysfunction in Patients With Aortic Stenosis.

Aortic stenosis (AS) and renal dysfunction share risk factors and often occur simultaneously. The influence of renal dysfunction on the prognosis of patients with various grades of AS has not been extensively described. The present study aimed to assess the prognostic implications of renal dysfunction in a large cohort of patients with aortic sclerosis and patients with various grades of AS. Patients diagnosed with various grades of AS by transthoracic echocardiography were assessed and divided according to renal function by estimated glomerular filtration rate (eGFR). The occurrence of all-cause mortality (primary end point) and aortic valve replacement (AVR) was noted. Of 1,178 patients (mean age 70 ± 13 years, 60% male), 327 (28%) had aortic sclerosis, 86 (7%) had mild AS, 285 (24%) had moderate AS, and 480 (41%) had severe AS. Renal dysfunction (eGFR <60 ml/min/1.73 m2) was present in 440 (37%) patients, and moderate to severe AS was observed more often in these patients compared to patients without (70 vs 62%, respectively; p = 0.008). After a median follow-up of 95 [31 to 149] months, 626 (53%) patients underwent AVR and 549 (47%) patients died. Severely impaired renal function (eGFR <30 ml/min/1.73 m2) and AVR were independently associated with all-cause mortality after correcting for AS severity. In conclusion, renal dysfunction is highly prevalent in patients with various grades of AS. After correcting for AS severity and AVR, severely impaired renal function (eGFR <30 ml/min/1.73 m2) was independently associated with all-cause mortality. Independent of renal function, AVR was associated with improved survival.

Prognostic implications of left ventricular global longitudinal strain in patients with bicuspid aortic valve disease and preserved left ventricular ejection fraction.

AIMS: In patients with bicuspid aortic valve (BAV) and preserved left ventricular (LV) ejection fraction (EF), the frequency of impaired LV global longitudinal strain (GLS) and its prognostic implications are unknown. The present study evaluated the proportion and prognostic value of impaired LV GLS in patients with BAV and preserved LVEF. METHODS AND RESULTS: Five hundred and thirteen patients (68% men; mean age 44 ± 18 years) with BAV and preserved LVEF (>50%) were divided into five groups according to the type of BAV dysfunction: (i) normal function BAV, (ii) mild aortic stenosis (AS) or aortic regurgitation (AR), (iii) ≥moderate isolated AS, (iv) ≥moderate isolated AR, and (v) ≥moderate mixed AS and AR. LV systolic dysfunction based on 2D speckle-tracking echocardiography was defined as a cut-off value of LVGLS (-13.6%). The primary outcome was aortic valve intervention or all-cause mortality. The proportion of patients with LVGLS ≤-13.6% was the highest in the normal BAV group (97%) and the lowest in the group with moderate and severe mixed AS and AR (79%). During a median follow-up of 10 years, 210 (41%) patients underwent aortic valve replacement and 17 (3%) died. Patients with preserved LV systolic function (LVGLS ≤ -13.6%) had significantly better event-free survival compared to those with impaired LV systolic function (LVGLS > -13.6%). LVGLS was independently associated with increased risk of events (mainly aortic valve replacement): hazard ratio 1.09; P < 0.001. CONCLUSION: Impaired LVGLS in BAV with preserved LVEF is not infrequent and was independently associated with increased risk of events (mainly aortic valve replacement events).

Feature tracking computed tomography-derived left ventricular global longitudinal strain in patients with aortic stenosis: a comparative analysis with echocardiographic measurements.

BACKGROUND: Left ventricular (LV) systolic function is a prognostic factor in patients with severe aortic stenosis (AS). Multi-detector row computed tomography (MDCT) data are key in the evaluation of patients undergoing transcatheter aortic valve implantation (TAVI) and when acquired retrospectively, LV systolic function can be assessed. Novel software permits assessment of LV global longitudinal strain (GLS) from MDCT data. OBJECTIVES: The present study investigated the feasibility of feature tracking MDCT-derived LV GLS and its agreement with echocardiographic LV GLS in patients treated with TAVI. METHODS: LV GLS was measured on transthoracic echocardiography using speckle tracking analysis and on dynamic MDCT using feature tracking technology. Agreement between the measurements of two different modalities was assessed using Bland-Altman analysis. RESULTS: A total of 214 patients (51% male, mean age: 80 ± 7 years) were analysed. Mean LV GLS on echocardiography was -13.91 ± 4.32%, whereas mean feature tracking MDCT-derived GLS was -12.46 ± 3.97%. Correlation of measurements between feature tracking MDCT-derived LV GLS and echocardiographic LV GLS demonstrated a large effect size (r = 0.791, p < 0.001). On Bland-Altman analysis, feature tracking MDCT-derived strain analysis underestimated LV GLS compared to echocardiography with a mean difference of 1.44% (95% limits of agreement -3.85% - 6.73%). CONCLUSIONS: Assessment of LV GLS on dynamic feature tracking MDCT data is feasible in TAVI patients. Compared to speckle tracking echocardiography, feature tracking MDCT underestimates the value of LV GLS.

One-Year Follow-Up of Conduction Abnormalities After Transcatheter Aortic Valve Implantation With the SAPIEN 3 Valve.

Long-term evolution of new-onset conduction abnormalities and need of permanent pacemaker implantation (PPI) after transcatheter aortic valve implantation (TAVI) have not been extensively evaluated. We describe the incidence and time course of new conduction abnormalities and the rate of PPI with the new-generation transcatheter aortic valve prosthesis Edwards SAPIEN 3 (S3). In total, 266 patients with severe aortic stenosis who underwent TAVI were retrospectively analyzed. Twelve-lead electrocardiograms at baseline, after TAVI, at discharge, at 1-, 6-, and 12-month follow-up were evaluated to identify conduction abnormalities and PPI requirements to investigate the correlates of PPI. After TAVI, a significant increase in PR interval duration and in QRS complex width was observed. New-onset left bundle branch block was observed in 65 patients (24%) after TAVI. The number of patients with left bundle branch block was maximum at hospital discharge and decreased at 12-month follow-up (39% and 32%, respectively). Thirty-five patients (13%) required PPI during the follow-up. However, paced rhythm was only observed in 7% of the patients with a complete 12-month follow-up. Patients who underwent PPI had a higher prevalence of first-degree atrioventricular block, complete right bundle branch block, and wider QRS complex at baseline. Baseline right bundle branch block and QRS width immediately after TAVI were the only variables independently associated with PPI. In conclusion, conduction disorders have a temporary nature after TAVI and showed a trend toward stabilization during the following months. With this new-generation device, the incidence of new conduction abnormalities requiring PPI is relatively low.

Staging Cardiac Damage in Patients With Asymptomatic Aortic Valve Stenosis.

BACKGROUND: The optimal timing of intervention in patients with asymptomatic severe aortic stenosis (AS) remains controversial. OBJECTIVES: This multicenter study sought to test and validate the prognostic value of the staging of cardiac damage in patients with asymptomatic moderate to severe AS. METHODS: This study retrospectively analyzed the clinical, Doppler echocardiographic, and outcome data that were prospectively collected in 735 asymptomatic patients (71 ± 14 years of age; 60% men) with at least moderate AS (aortic valve area <1.5 cm2) and preserved left ventricular ejection fraction (≥50%) followed in the heart valve clinics of 4 high-volume centers. Patients were classified according to the following staging classification: no cardiac damage associated with the valve stenosis (Stage 0), left ventricular damage (Stage 1), left atrial or mitral valve damage (Stage 2), pulmonary vasculature or tricuspid valve damage (Stage 3), or right ventricular damage or subclinical heart failure (Stage 4). The primary endpoint was all-cause mortality. RESULTS: At baseline, 89 (12%) patients were classified in Stage 0, 200 (27%) in Stage 1, 341 (46%) in Stage 2, and 105 (14%) in Stage 3 or 4. Median follow-up was 2.6 years (interquartile range: 1.1 to 5.2 years). There was a stepwise increase in mortality rates according to staging: 13% in Stage 0, 25% in Stage 1, 44% in Stage 2, and 58% in Stages 3 to 4 (p < 0.0001). The staging was significantly associated with excess mortality in multivariable analysis adjusted for aortic valve replacement as a time-dependent variable (hazard ratio: 1.31 per each increase in stage; 95% CI: 1.06 to 1.61; p = 0.01), and showed incremental value to several clinical variables (net reclassification index = 0.34; p = 0.003). CONCLUSIONS: The new staging system characterizing the extra-aortic valve cardiac damage provides incremental prognostic value in patients with asymptomatic moderate to severe AS. This staging classification may be helpful to identify asymptomatic AS patients who may benefit from elective aortic valve replacement.

Staging Cardiac Damage in Patients With Symptomatic Aortic Valve Stenosis.

BACKGROUND: In severe aortic stenosis (AS), patients often show extra-aortic valvular injury. Recently, a new staging system for severe AS has been proposed on the basis of the extent of cardiac damage. OBJECTIVES: The present study evaluated the prevalence and prognostic impact of these different stages of cardiac damage in a large, real-world, multicenter cohort of symptomatic severe AS patients. METHODS: From the ongoing registries from 2 academic institutions, a total of 1,189 symptomatic severe AS patients were selected and retrospectively analyzed. According to the extent of cardiac damage on echocardiography, patients were classified as Stage 0 (no cardiac damage), Stage 1 (left ventricular damage), Stage 2 (mitral valve or left atrial damage), Stage 3 (tricuspid valve or pulmonary artery vasculature damage), or Stage 4 (right ventricular damage). Patients were followed for all-cause mortality and combined endpoint (all-cause mortality, stroke, and cardiac-related hospitalization). RESULTS: On the basis of the proposed classification, 8% of patients were classified as Stage 0, 24% as Stage 1, 49% as Stage 2, 7% as Stage 3, and 12% as Stage 4. On multivariable analysis, cardiac damage was independently associated with all-cause mortality and combined outcome, although this was mainly determined by Stages 3 and 4. CONCLUSIONS: In this large multicenter cohort of symptomatic severe AS patients, stage of cardiac injury as classified by a novel staging system was independently associated with all-cause mortality and combined endpoint, although this seemed to be predominantly driven by tricuspid valve or pulmonary artery vasculature damage (Stage 3) and right ventricular dysfunction (Stage 4).

Changes in Left Ventricular Global Longitudinal Strain after Transcatheter Aortic Valve Implantation according to Calcification Burden of the Thoracic Aorta.

BACKGROUND: After transcatheter aortic valve replacement (TAVR), changes in left ventricular (LV) function are partly influenced by the vascular afterload. The burden of thoracic aorta calcification is a component of vascular afterload. OBJECTIVE: To assess changes in LV systolic function measured with global longitudinal strain (GLS) in relation to the burden of thoracic aorta calcification in patients with severe aortic stenosis treated with TAVR. METHODS: Calcification of the thoracic aorta was estimated on noncontrast computed tomography in 210 patients (50% male, 80 ± 7 years) undergoing TAVR. Conventional and speckle-tracking echocardiography were performed at baseline (prior to TAVR) and 3-6 months and 12 months after TAVR. Patients were divided according to tertiles of calcification burden of the thoracic aorta. RESULTS: At baseline, patients within the first tertile of thoracic aorta calcification (0-1,395 Hounsfield Units, HU) had better LV systolic function (LV ejection fraction [LVEF], 47% ± 9%; and LV GLS, -15% ± 5%) as compared with the second tertile (1,396-4,634 HU; LVEF, 46% ± 10%; and LV GLS, -14% ± 4%), and the third tertile (>4,634 HU; LVEF, 44% ± 10%; and LV GLS, -12% ± 4%). During follow-up, patients within tertile 1 of calcification of thoracic aorta achieved significantly better LV systolic function and larger regression of LV mass at 12 months of follow-up than patients within the other tertiles. This pattern was more pronounced in patients with reduced LVEF at baseline. CONCLUSIONS: After TAVR, LVEF and GLS improves and LV mass index is reduced significantly at 3-6 and 12 months of follow-up. Patients within the lowest burden of thoracic aorta calcification achieved the best values of LVEF and LV GLS at 1-year follow-up.

Time course of left ventricular remodelling and mechanics after aortic valve surgery: aortic stenosis vs. aortic regurgitation.

AIMS: Pressure overload in aortic stenosis (AS) and both pressure and volume overload in aortic regurgitation (AR) induce concentric and eccentric hypertrophy, respectively. These structural changes influence left ventricular (LV) mechanics, but little is known about the time course of LV remodelling and mechanics after aortic valve surgery (AVR) and its differences in AS vs. AR. The present study aimed to characterize the time course of LV mass index (LVMI) and LV mechanics [by LV global longitudinal strain (LV GLS)] after AVR in AS vs. AR. METHODS AND RESULTS: Two hundred and eleven (61 ± 14 years, 61% male) patients with severe AS (63%) or AR (37%) undergoing surgical AVR with routine echocardiographic follow-up at 1, 2, and/or 5 years were evaluated. Before AVR, LVMI was larger in AR patients compared with AS. Both groups showed moderately impaired LV GLS, but preserved LV ejection fraction. After surgery, both groups showed LV mass regression, although a more pronounced decline was seen in AR patients. Improvement in LV GLS was observed in both groups, but characterized by an initial decline in AR patients while LV GLS in AS patients remained initially stable. CONCLUSION: In severe AS and AR patients undergoing AVR, LV mass regression and changes in LV GLS are similar despite different LV remodelling before AVR. In AR, relief of volume overload led to reduction in LVMI and an initial decline in LV GLS. In contrast, relief of pressure overload in AS was characterized by a stable LV GLS and more sustained LV mass regression.

Prognostic Implications of Right Ventricular Free Wall Longitudinal Strain in Patients With Significant Functional Tricuspid Regurgitation.

Background In patients with significant functional tricuspid regurgitation, timely detection of right ventricular (RV) dysfunction with conventional 2-dimensional echocardiography is challenging, whereas speckle-tracking echocardiography RV free wall longitudinal strain has been proposed as better prognosticator. We evaluated the prevalence and prognostic value of impaired RV free wall longitudinal strain in patients with significant functional tricuspid regurgitation, in comparison with tricuspid annular plane systolic excursion (TAPSE) and fractional area change (FAC). Methods Eight hundred ninety-six patients (51.3% men, 71 years [62-78 years]) with significant functional tricuspid regurgitation were divided according to the presence of RV dysfunction (defined as TAPSE <17 mm, FAC <35%, and RV free wall longitudinal strain >-23%) and were followed for the occurrence of all-cause mortality. Results RV free wall longitudinal strain identified the highest percentage of RV dysfunction (84.9%), in comparison to FAC (48.5%) and TAPSE (71.7%). During a median follow-up of 2.8 years (1.3-5.4 years), 443 (49.4%) patients died. Compared with survivors, nonsurvivors showed worse RV systolic dysfunction (FAC=36.5±12.7% versus 33.9±11.8%, P=0.001; TAPSE=15.4±5.0 versus 14.0±4.5 mm, P<0.001; RV free wall longitudinal strain=-15.9±7.5% versus -12.9±6.8%, P<0.001). Cumulative event-free survival was significantly worse in patients with decreased FAC, decreased TAPSE, and impaired RV free wall longitudinal strain. On multivariate analysis, RV free wall longitudinal strain was independently associated with all-cause mortality and incremental to FAC and TAPSE. Conclusions In significant tricuspid regurgitation, impaired RV free wall longitudinal strain identifies higher rates of RV dysfunction and is associated with worse outcome beyond conventional echocardiographic parameters of RV systolic function.

Echocardiography in Transcatheter Aortic Valve Replacement.

Transcatheter aortic valve replacement (TAVR) is a safe and efficient alternative for surgical valve aortic replacement in patients with symptomatic severe aortic stenosis who are inoperable or have a high risk for surgery. Randomised clinical trials have shown that TAVR is not inferior to surgical aortic valve replacement in intermediate-risk patients and ongoing trials will demonstrate the effects of TAVR in asymptomatic severe aortic stenosis patients and in patients with heart failure and moderate aortic stenosis. Continuous developments in procedural and post-procedural management along with increased operator experience and technical improvements and ongoing advances in imaging modalities (particularly in three-dimensional techniques), have reduced the procedural risks and the incidence of complications such as paravalvular aortic regurgitation. Importantly, proper selection of both patient and prosthesis, procedural guidance and follow-up of prosthesis performance remain paramount for the success of the TAVR. In all these steps, echocardiography plays a crucial role. An overview of the clinical applications and current role of echocardiographic techniques in patient selection, prosthesis sizing, periprocedural guidance and post-procedural follow-up will be provided in this review article.