Joseph Maalouf

Right Ventricular Strain for Prediction of Survival in Patients With Pulmonary Arterial Hypertension

BACKGROUND Pulmonary arterial hypertension (PAH) is a devastating illness of pulmonary vascular remodeling, right-sided heart failure, and limited survival. Whether strain-based measures of right ventricular (RV) systolic function predict future right-sided heart failure and/or death is untested. METHODS RV longitudinal systolic strain and strain rate were evaluated by echocardiography in 80 patients with World Health Organization group 1 pulmonary hypertension (PH) (72% were functional class [FC] III or IV). Survival status was assessed over 4 years. RESULTS All patients had a depressed RV systolic strain (-15% ± 5%) and strain rate (-0.80 ± 0.29 s(-1)). Of the parameters assessed, average RV free wall systolic strain worse than -12.5% identified a cohort with greater severity of disease (82% were FC III/IV), greater RV systolic dysfunction (RV stroke volume index 26 ± 9 mL/m(2)), and higher right atrial pressure (12 ± 5 mm Hg). Patients with an RV free wall strain worse than -12.5% were associated with a greater degree of disease progression within 6 months, a greater requirement for loop diuretics, and/or a greater degree of lower extremity edema, and it also predicted 1-, 2-, 3-, and 4-year mortality (unadjusted 1-year hazard ratio, 6.2; 2.1-22.3). After adjusting for age, sex, PH cause, and FC, patients had a 2.9-fold higher rate of death per 5% absolute decline in RV free wall strain at 1 year. CONCLUSIONS Noninvasive assessment of RV longitudinal systolic strain and strain rate independently predicts future right-sided heart failure, clinical deterioration, and mortality in patients with PAH.

Aortic Valve Calcification Determinants and Progression in the Population

Background—Aortic valve calcification (AVC) is considered degenerative. Recent data suggested links to atherosclerosis or coronary disease (CAD). Methods and Results—AVC and coronary artery calcifications (CAC) were prospectively assessed by Electron-Beam-Computed-Tomography in 262 population-based research participants ≥60 years. AVC was frequent (27%) with aging (P<0.01) and in men (P<0.05). AVC was associated with diabetes, hypertension, higher body-mass-index, and serum glucose (all P<0.05). AVC was a marker of higher prevalence (P<0.01) and severity of CAD (CAC score: 441±802 versus 265±566, P<0.05) independently of age. After follow-up of 3.8±0.9 years, AVC score increased (94±271 versus 54±173, P<0.01, +11±32 U/year), faster with higher baseline AVC score (P<0.01). Compared with participants remaining free of AVC, de novo acquisition of AVC was associated with higher LDL-cholesterol (141±31 versus 121±27 mg/dL, P<0.05) and faster CAC progression (+78±87 versus +28±47 U/year, P<0.05). In multivariate analysis, LDL-cholesterol independently determined AVC acquisition while higher baseline AVC scores determined faster progression of existing AVC. Conclusion—In the population, AVC is frequent with aging and atherosclerotic risk factors. AVC is a marker of subclinical CAD. AVC is progressive, appearing de novo with progressive atherosclerosis whereas established AVC progresses independently of atherosclerotic risk factors and faster with increasing initial AVC loads.

Quantitative Echocardiographic Determinants of Clinical Outcome in Asymptomatic Patients With Aortic Regurgitation : A Prospective Study

OBJECTIVES The purpose of this study was to define the link between aortic regurgitation (AR) quantitation and clinical outcome in asymptomatic patients with AR. BACKGROUND Quantitative American Society of Echocardiography (QASE) thresholds are recommended for AR assessment, but impact on clinical outcome is unknown. METHODS We prospectively enrolled (1991 to 2003) 251 asymptomatic patients (age 60 +/- 17 years) with isolated AR and ejection fraction > or =50% with quantified AR and left ventricular (LV) volumes using Doppler-echocardiography. RESULTS Survival under medical management was independently determined by baseline regurgitant volume (RVol) (adjusted hazard ratio [HR] 1.22 [95% confidence interval (CI) 1.08 to 1.35] per 10 ml/beat, p = 0.002) and effective regurgitant orifice (ERO) (adjusted HR 1.52 [95% CI 1.19 to 1.91] per 10 mm(2), p = 0.002), which superseded traditional AR grading. Patients with QASE-severe AR (RVol > or =60 ml/beat or ERO > or =30 mm(2)) versus QASE-mild AR (RVol <30 ml and ERO <10 mm(2)) had lower survival (10 years: 69 +/- 9% vs. 92 +/- 4%, p = 0.05) independently of all clinical characteristics (adjusted HR 4.1 [95% CI 1.4 to 14.1], p = 0.01) and lower survival free of surgery for AR (10 years: 20 +/- 5% vs. 92 +/- 4%, p < 0.001, adjusted HR 12.9 [95% CI 5.4 to 38.5]). Cardiac events were considerably more frequent with QASE-severe versus -moderate or -mild AR (10 years: 63 +/- 8% vs. 34 +/- 6% and 21 +/- 8%, p < 0.0001). Independent determinants of cardiac events were quantitative AR grading (QASE-severe adjusted HR 5.2 [95% CI 2.2 to 14.8], p < 0.001; QASE-moderate adjusted HR 2.4 [95% CI 1.06 to 6.6], p = 0.035), which superseded traditional AR assessment (p < 0.001) and LV end-systolic volume index (ESVI) (adjusted HR 1.09 [95% CI 1.03 to 1.14 per 10 ml/m(2)], p = 0.002), which superseded LV M-mode diameters. In QASE-severe AR, patients with ESVI > or =45 versus <45 ml/m(2) had higher cardiac event rates (10 years: 87 +/- 8% vs. 40 +/- 10%, p < 0.001). Cardiac surgery for AR reduced cardiac events in patients with QASE-severe AR (adjusted HR 0.23 [95% CI 0.09 to 0.57], p = 0.002). CONCLUSIONS Echocardiographic quantitation of AR severity and ESVI provides independent and superior predictors of clinical outcome in asymptomatic patients with AR and ejection fraction > or =50% and should be widely clinically applied. Patients with QASE-severe AR and ESVI > or =45 ml/m(2) should be carefully considered for cardiac surgery, which reduces cardiac events risk.

Inconsistent echocardiographic grading of aortic stenosis: is the left ventricular outflow tract important?

Objective Discrepancy in the echocardiographic severity grading of aortic stenosis (AS) based on current guidelines has been reported. We sought to investigate the left ventricular outflow tract diameter (LVOTd) as a source of inconsistencies, and to explore hypothetical alternatives for discrepancy improvement. Design Retrospective echocardiographic cross-sectional analysis. Setting From 2000 to 2010, we identified all AS patients with left ventricular EF ≥50%, mean gradient (MG) ≥20 mm Hg, aortic valve area (AVA) ≤2.5 cm2, <moderate (2+) aortic regurgitation; and divided them into three groups: patients with ‘small ’ LVOTd 1.7–1.9 cm, ‘average’ LVOTd 2.0–2.2 cm and ‘large’ LVOTd ≥2.3 cm. In each group, inconsistency of data for classification of severity of AS was assessed and alternative thresholds explored. Results Of 9488 total patients, 58% were men, LVOTd 2.18±0.19 cm, peak velocity (Vmax) 3.9±0.8 m/s, MG 37±16 mm Hg, and AVA 1.09±0.34 cm2. Small LVOTd patients were older women (91%) with worse systemic haemodynamics and more prevalent paradoxical low-flow, compared with average and large LVOTd patients (all parameters p <0.001). Despite clinically similar MG and Vmax across all groups, mean AVA ranged from 0.88 to 1.25 cm2 (p <0.001), classifying small LVOTd patients as severe, average LVOTd as moderate-severe and large LVOTd as moderate. For patients with large, average and small LVOTd, an AVA of 1 cm2 corresponded to MG of 42, 35 and 29 mm Hg, Vmax of 4.1, 3.8 and 3.5 m/s and dimensionless index (DI) of 0.22, 0.29 and 0.36, respectively. An AVA cut-off of 0.8 cm2 reduced severe AS inconsistency from 48% to 26% for small LVOTd patients. An AVA cut-off of 0.9 cm2 reduced severe AS inconsistency from 37% to 26% for average LVOTd patients. The current AVA cut-off of 1 cm2 was consistent for large LVOTd patients. Conclusions The LVOTd is associated with significant inconsistencies in AS assessment by current guidelines. For patients with normal EF and normal flow, current guideline definition of severe AS is most consistent for patients with large LVOTd, but not so for patients with average or small LVOTd in whom lower AVA cut-offs should be further studied. The DI cut-off for severe AS is highly variable depending on the LVOTd and guideline revision of this threshold should be considered.

Original researchQuantitative Echocardiographic Determinants of Clinical Outcome in Asymptomatic Patients With Aortic Regurgitation: A Prospective Study

OBJECTIVES The purpose of this study was to define the link between aortic regurgitation (AR) quantitation and clinical outcome in asymptomatic patients with AR. BACKGROUND Quantitative American Society of Echocardiography (QASE) thresholds are recommended for AR assessment, but impact on clinical outcome is unknown. METHODS We prospectively enrolled (1991 to 2003) 251 asymptomatic patients (age 60 +/- 17 years) with isolated AR and ejection fraction > or =50% with quantified AR and left ventricular (LV) volumes using Doppler-echocardiography. RESULTS Survival under medical management was independently determined by baseline regurgitant volume (RVol) (adjusted hazard ratio [HR] 1.22 [95% confidence interval (CI) 1.08 to 1.35] per 10 ml/beat, p = 0.002) and effective regurgitant orifice (ERO) (adjusted HR 1.52 [95% CI 1.19 to 1.91] per 10 mm(2), p = 0.002), which superseded traditional AR grading. Patients with QASE-severe AR (RVol > or =60 ml/beat or ERO > or =30 mm(2)) versus QASE-mild AR (RVol <30 ml and ERO <10 mm(2)) had lower survival (10 years: 69 +/- 9% vs. 92 +/- 4%, p = 0.05) independently of all clinical characteristics (adjusted HR 4.1 [95% CI 1.4 to 14.1], p = 0.01) and lower survival free of surgery for AR (10 years: 20 +/- 5% vs. 92 +/- 4%, p < 0.001, adjusted HR 12.9 [95% CI 5.4 to 38.5]). Cardiac events were considerably more frequent with QASE-severe versus -moderate or -mild AR (10 years: 63 +/- 8% vs. 34 +/- 6% and 21 +/- 8%, p < 0.0001). Independent determinants of cardiac events were quantitative AR grading (QASE-severe adjusted HR 5.2 [95% CI 2.2 to 14.8], p < 0.001; QASE-moderate adjusted HR 2.4 [95% CI 1.06 to 6.6], p = 0.035), which superseded traditional AR assessment (p < 0.001) and LV end-systolic volume index (ESVI) (adjusted HR 1.09 [95% CI 1.03 to 1.14 per 10 ml/m(2)], p = 0.002), which superseded LV M-mode diameters. In QASE-severe AR, patients with ESVI > or =45 versus <45 ml/m(2) had higher cardiac event rates (10 years: 87 +/- 8% vs. 40 +/- 10%, p < 0.001). Cardiac surgery for AR reduced cardiac events in patients with QASE-severe AR (adjusted HR 0.23 [95% CI 0.09 to 0.57], p = 0.002). CONCLUSIONS Echocardiographic quantitation of AR severity and ESVI provides independent and superior predictors of clinical outcome in asymptomatic patients with AR and ejection fraction > or =50% and should be widely clinically applied. Patients with QASE-severe AR and ESVI > or =45 ml/m(2) should be carefully considered for cardiac surgery, which reduces cardiac events risk.

Mitral valve prolapse with mid-late systolic mitral regurgitation: pitfalls of evaluation and clinical outcome compared with holosystolic regurgitation.

Background— Mitral regurgitation (MR) of mitral valve prolapse predominates in late systole but may be holosystolic or purely mid-late systolic, but the impact of MR timing on MR left ventricular and left atrial consequences and outcome is unknown. Whether effective regurgitant orifice (ERO) by the flow convergence method is similarly linked to outcome in mid-late systolic MR and holosystolic MR is uncertain. Methods and Results— We comprehensively and prospectively quantified MR in 111 patients with mitral valve prolapse and mid-late systolic MR and matched them to 90 patients with mitral valve prolapse and holosystolic MR for age, gender, atrial fibrillation, ejection fraction, and ERO (flow convergence). Mid-late systolic MR versus holosystolic MR groups were well matched, including for comorbidity, blood pressure, and heart rate (all P>0.10). Mid-late systolic MR versus holosystolic MR caused similar color jet area, midsystolic regurgitant flow, and peak velocity (P>0.40). Despite identical ERO (0.25±0.15 versus 0.25±0.15 cm2; P=0.53), the shorter duration of mid-late systolic MR (233±56 versus 426±50 ms; P<0.0001) yielded lower regurgitant volume (24.8±13.4 versus 48.6±25.6 mL; P<0.0001). MR consequences, systolic pulmonary pressure, and left ventricular and left atrial volume index (all P<0.001) were more benign in mid-late systolic MR versus holosystolic MR. Under medical management, fewer cardiac events (5 years: 15.8±4.6% versus 40.4±6.1%; P<0.0001) occurred in mid-late systolic MR versus holosystolic MR, requiring less mitral surgery. Multivariable analysis confirmed the independent association of mid-late systolic MR with benign consequences and outcomes (all P<0.01). Absolute ERO was not linked to outcome, in contrast to regurgitant volume. Conclusions— MR of mitral valve prolapse that is purely mid-late systolic causes more benign consequences and outcomes than holosystolic MR. Assessment may be misleading because jet area and ERO by flow convergence appear similar to those of holosystolic MR. However, shorter MR yields lower regurgitant volume, consequences, and benign outcomes. Instantaneous ERO by flow convergence should be interpreted in context, and in mid-late systolic MR, regurgitant volume provides information more reflective of MR severity. Therefore, for clinical management and surgical referral, clinicians should carefully take into account the timing and consequences of MR.Background— Mitral regurgitation (MR) of mitral valve prolapse predominates in late systole but may be holosystolic or purely mid-late systolic, but the impact of MR timing on MR left ventricular and left atrial consequences and outcome is unknown. Whether effective regurgitant orifice (ERO) by the flow convergence method is similarly linked to outcome in mid-late systolic MR and holosystolic MR is uncertain. Methods and Results— We comprehensively and prospectively quantified MR in 111 patients with mitral valve prolapse and mid-late systolic MR and matched them to 90 patients with mitral valve prolapse and holosystolic MR for age, gender, atrial fibrillation, ejection fraction, and ERO (flow convergence). Mid-late systolic MR versus holosystolic MR groups were well matched, including for comorbidity, blood pressure, and heart rate (all P >0.10). Mid-late systolic MR versus holosystolic MR caused similar color jet area, midsystolic regurgitant flow, and peak velocity ( P >0.40). Despite identical ERO (0.25±0.15 versus 0.25±0.15 cm2; P =0.53), the shorter duration of mid-late systolic MR (233±56 versus 426±50 ms; P <0.0001) yielded lower regurgitant volume (24.8±13.4 versus 48.6±25.6 mL; P <0.0001). MR consequences, systolic pulmonary pressure, and left ventricular and left atrial volume index (all P <0.001) were more benign in mid-late systolic MR versus holosystolic MR. Under medical management, fewer cardiac events (5 years: 15.8±4.6% versus 40.4±6.1%; P <0.0001) occurred in mid-late systolic MR versus holosystolic MR, requiring less mitral surgery. Multivariable analysis confirmed the independent association of mid-late systolic MR with benign consequences and outcomes (all P <0.01). Absolute ERO was not linked to outcome, in contrast to regurgitant volume. Conclusions— MR of mitral valve prolapse that is purely mid-late systolic causes more benign consequences and outcomes than holosystolic MR. Assessment may be misleading because jet area and ERO by flow convergence appear similar to those of holosystolic MR. However, shorter MR yields lower regurgitant volume, consequences, and benign outcomes. Instantaneous ERO by flow convergence should be interpreted in context, and in mid-late systolic MR, regurgitant volume provides information more reflective of MR severity. Therefore, for clinical management and surgical referral, clinicians should carefully take into account the timing and consequences of MR. # Clinical Perspective {#article-title-44}

Real-Time 3-Dimensional Dynamics of Functional Mitral Regurgitation: A Prospective Quantitative and Mechanistic Study

Background Three‐dimensional transthoracic echocardiography (3D‐TTE) with dedicated software permits quantification of mitral annulus dynamics and papillary muscle motion throughout the cardiac cycle. Methods and Results Mitral apparatus 3D‐TTE was acquired in controls (n=42), patients with left ventricle dysfunction and functional mitral regurgitation (LVD‐FMR; n=43) or without FMR (LVD‐noMR, n=35). Annulus in both normal and LVD‐noMR subjects displayed saddle shape accentuation in early‐systole (ratio of height to intercommissural diameter, 10.6±3.7 to 13.5±4.0 in normal and 9.1±4.3 to 12.6±3.6 in LVD‐noMR; P<0.001 for diastole to early‐systole motion, P=NS between those groups). In contrast, saddle shape was unchanged from diastole in FMR patients (10.0±6.4 to 8.0±5.2; P=NS, P<0.05 compared to both other groups). Papillary tips moved symmetrically towards to the midanterior annulus in control and LVD‐noMR subjects, maintaining constant ratio of the distances between both tips to midannulus (PtAR) throughout systole. In LVD‐FMR patients midsystolic posterior papillary tip to anterior annulus distance was increased, resulting in higher PtAR (P=0.05 compared to both other groups). Mechanisms of early‐ and midsystolic FMR differed between different etiologies of LV dysfunction. In patients with anterior MI and global dysfunction annular function and dilatation were the dominant parameters, while papillary muscle motion was the predominant determinant of FMR in patients with inferior MI. Conclusions Inadequate early‐systolic annular contraction and saddle‐shape accentuation in patients with impaired LV contribute to early–mitral incompetency. Asymmetric papillary tip movement towards the midanterior annulus is a major determinant of mid‐ and late‐systolic functional mitral regurgitation.

Twenty-Year Outcome after Mitral Repair Versus Replacement for Severe Degenerative Mitral Regurgitation. Analysis of a Large, Prospective, Multicenter International Registry.

Background: Mitral valve (MV) repair is preferred over replacement in clinical guidelines and is an important determinant of the indication for surgery in degenerative mitral regurgitation. However, the level of evidence supporting current recommendations is low, and recent data cast doubts on its validity in the current era. Accordingly, the aim of the present study was to analyze very long-term outcome after MV repair and replacement for degenerative mitral regurgitation with a flail leaflet. Methods: MIDA (Mitral Regurgitation International Database) is a multicenter registry enrolling patients with degenerative mitral regurgitation with a flail leaflet in 6 tertiary European and US centers. We analyzed the outcome after MV repair (n=1709) and replacement (n=213) overall, by propensity score matching, and by inverse probability-of-treatment weighting. Results: At baseline, patients undergoing MV repair were younger, had more comorbidities, and were more likely to present with a posterior leaflet prolapse than those undergoing MV replacement. After propensity score matching and inverse probability-of-treatment weighting, the 2 treatments groups were balanced, and absolute standardized differences were usually <10%, indicating adequate match. Operative mortality (defined as a death occurring within 30 days from surgery or during the same hospitalization) was lower after MV repair than after replacement in both the entire population (1.3% versus 4.7%; P<0.001) and the propensity-matched population (0.2% versus 4.4%; P<0.001). During a mean follow-up of 9.2 years, 552 deaths were observed, of which 207 were of cardiovascular origin. Twenty-year survival was better after MV repair than after MV replacement in both the entire population (46% versus 23%; P<0.001) and the matched population (41% versus 24%; P<0.001). Similar superiority of MV repair was obtained in patient subsets on the basis of age, sex, or any stratification criteria (all P<0.001). MV repair was also associated with reduced incidence of reoperations and valve-related complications. Conclusions: Among patients with degenerative mitral regurgitation with a flail leaflet referred to mitral surgery, MV repair was associated with lower operative mortality, better long-term survival, and fewer valve-related complications compared with MV replacement.

Prediction of right ventricular failure after ventricular assist device implant: systematic review and meta-analysis of observational studies

Right ventricular failure (RVF) after left ventricular assist device (LVAD) implantation is associated with increased morbidity and mortality, but the identification of LVAD candidates at risk for RVF remains challenging. We undertook a systematic review and meta‐analysis of observational studies of risk factors associated with RVF after LVAD implant. Thirty‐six studies published between 1 January 1995 and 30 April 2015, comprising 995 RVF patients out of a pooled final population of 4428 patients, were identified. Meta‐analysed prevalence of post‐LVAD RVF was 35%. A need for mechanical ventilation [odds ratio (OR) 2.99], or continuous renal replacement therapy (CRRT; OR 4.61, area under the curve 0.78, specificity 0.91) were the clinical variables with the highest effect size (ES) in predicting RVF. International normalized ratio [INR; standardized mean difference (SMD) 0.49] and N‐terminal pro‐brain natriuretic peptide (NT‐proBNP) (SMD 0.52) were the biochemical markers that best discriminated between RVF and No‐RVF populations, though NT‐proBNP was highly heterogeneous. Right ventricular stroke work index (RVSWI) and central venous pressure (CVP) (SMD −0.58 and 0.47, respectively) were the haemodynamic measures with the highest ES in identifying patients at risk of post‐LVAD RVF; CVP was particularly useful in risk stratifying patients undergoing continuous‐flow LVAD implant (SMD 0.59, P < 0.001, I2 = 20.9%). Finally, pre‐implant moderate to severe right ventricular (RV) dysfunction, as assessed qualitatively (OR 2.82), or a greater RV/LV diameter ratio (SMD 0.51) were the standard echocardiographic measurements with the highest ES in comparing RVF with No‐RVF patients. Longitudinal systolic strain of the RV free wall had the highest ES (SMD 0.73) but also the greatest heterogeneity (I2 = 74%) and was thus only marginally significant (P = 0.05). Patients on ventilatory support or CRRT are at high risk for post‐LVAD RVF, similarly to patients with slightly increased INR, high NT‐proBNP or leukocytosis. High CVP, low RVSWI, an enlarged right ventricle with concomitant low RV strain also identify patients at higher risk.

Congestive heart failure complicating aortic regurgitation with medical and surgical management: A prospective study of traditional and quantitative echocardiographic markers

OBJECTIVE Congestive heart failure complicating aortic regurgitation is poorly described, and predictive roles of quantitative versus traditional (symptoms or low ejection fraction) surgical markers are unclear. METHODS We prospectively enrolled 287 patients with aortic regurgitation (age, 61 +/- 17 years; 68% male) in whom we performed quantitative Doppler echocardiographic analysis and personal physicians conducted management. RESULTS After diagnosis, 40 congestive heart failure episodes occurred under medical management (10-year, 23% +/- 4%) causing high subsequent mortality (hazard ratio [HR], 2.8; 95% confidence interval [CI], 1.2-6.8; P = .02). Patients with traditional surgical markers (symptoms or ejection fraction <50%) were surprisingly followed 1.4 +/- 3.3 years under medical management with frequent congestive heart failure (adjusted risk, 4.9; 95% CI, 2.1-11.0; P < .001) and excess postoperative mortality (HR, 3.0; 95% CI, 1.3-7.1; P = .01). Quantitative American Society of Echocardiography aortic regurgitation grading and left ventricular end-systolic volume index independently predicted congestive heart failure (quantitative American Society of Echocardiography severe aortic regurgitation: HR, 3.6; 95% CI, 1.3-13.0; P = .015; end-systolic volume index >or=45 mL/m(2): HR, 2.1; 95% CI, 1.03-4.4; P = .04) or death-congestive heart failure with incremental predictive value (P < .001). Higher congestive heart failure rates occurred with quantitative American Society of Echocardiography severe aortic regurgitation (regurgitant volume of >or=60 mL/beat or orifice of >or=30 mm(2)) versus quantitative American Society of Echocardiography mild aortic regurgitation (10-year: 44% +/- 10% vs 15% +/- 7%, P < .001) and end-systolic volume index of 45 mL/m(2) or greater versus less than 45 mL/m(2) (33% +/- 7% vs 9% +/- 2%, P < .001). Traditional markers (symptoms and ejection fraction <50%) had lower sensitivity for congestive heart failure than quantitative echocardiography (all P < .001). Cardiac surgery for aortic regurgitation markedly reduced congestive heart failure in quantitative American Society of Echocardiography severe aortic regurgitation (HR, 0.23; 95% CI, 0.08-0.68; P = .008) without excess mortality (P = .10). CONCLUSION This prospective study of aortic regurgitation shows frequent congestive heart failure under conservative management. Traditional surgical markers (symptoms and ejection fraction <50%) predict subsequent congestive heart failure but are insensitive, and rescue operations are often delayed and associated with excess mortality. Quantitative echocardiography provides congestive heart failure predictors that are independent, incremental, and more sensitive than traditional markers. Cardiac surgery for aortic regurgitation markedly reduces congestive heart failure rates in high-risk patients with aortic regurgitation.