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  • Ovid Technologies (Wolters Kluwer Health)  (66)
  • 1
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 111, No. 24 ( 2005-06-21), p. 3290-3295
    Kurzfassung: Background— This study assessed the long-term outcome of a large, asymptomatic population with hemodynamically significant aortic stenosis (AS). Methods and Results— We identified 622 patients with isolated, asymptomatic AS and peak systolic velocity ≥4 m/s by Doppler echocardiography who did not undergo surgery at the initial evaluation and obtained follow-up (5.4±4.0 years) in all. Mean age (±SD) was 72±11 years; there were 384 (62%) men. The probability of remaining free of cardiac symptoms while unoperated was 82%, 67%, and 33% at 1, 2, and 5 years, respectively. Aortic valve area and left ventricular hypertrophy predicted symptom development. During follow-up, 352 (57%) patients were referred for aortic valve surgery and 265 (43%) patients died, including cardiac death in 117 (19%). The 1-, 2-, and 5-year probabilities of remaining free of surgery or cardiac death were 80%, 63%, and 25%, respectively. Multivariate predictors of all-cause mortality were age (hazard ratio [HR] , 1.05; P 〈 0.0001), chronic renal failure (HR, 2.41; P =0.004), inactivity (HR, 2.00; P =0.001), and aortic valve velocity (HR, 1.46; P =0.03). Sudden death without preceding symptoms occurred in 11 (4.1%) of 270 unoperated patients. Patients with peak velocity ≥4.5 m/s had a higher likelihood of developing symptoms (relative risk, 1.34) or having surgery or cardiac death (relative risk, 1.48). Conclusions— Most patients with asymptomatic, hemodynamically significant AS will develop symptoms within 5 years. Sudden death occurs in ≈1%/y. Age, chronic renal failure, inactivity, and aortic valve velocity are independently predictive of all-cause mortality.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2005
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    In: Circulation: Heart Failure, Ovid Technologies (Wolters Kluwer Health), Vol. 3, No. 1 ( 2010-01), p. 51-58
    Kurzfassung: Background— Myocardial late gadolinium enhancement (LGE) on contrast-enhanced magnetic resonance imaging (CE-MRI) of patients with hypertrophic cardiomyopathy (HCM) has been suggested to represent intramyocardial fibrosis and, as such, an adverse prognostic risk factor. We evaluated the characteristics of LGE on CE-MRI and explored whether LGE among patients with HCM was associated with genetic testing, severe symptoms, ventricular arrhythmias, or sudden cardiac death (SCD). Methods and Results— Four hundred twenty-four patients with HCM (age=55±16 years [range 2 to 90], 41% females), without a history of septal ablation/myectomy, underwent CE-MRI (GE 1.5 Tesla). We evaluated the relation between LGE and HCM genes status, severity of symptoms, and the degree of ventricular ectopy on Holter ECG. Subsequent SCD and appropriate implanted cardioverter defibrillator (ICD) therapies were recorded during a mean follow-up of 43±14 months (range 16 to 94). Two hundred thirty-nine patients (56%) had LGE on CE-MRI, ranging from 0.4% to 65% of the left ventricle. Gene-positive patients were more likely to have LGE ( P 〈 0.001). The frequencies of New York Heart Association class ≥3 dyspnea and angina class ≥3 were similar in patients with and without LGE (125 of 239 [52%] versus 94 of 185 [51%] and 24 of 239 [10%] versus 18 of 185 [10%] , respectively, P =NS). LGE-positive patients were more likely to have episodes of nonsustained ventricular tachycardia (34 of 126 [27%] versus 8 of 94 [8.5%] , P 〈 0.001), had more episodes of nonsustained ventricular tachycardia per patient (4.5±12 versus 1.1±0.3, P =0.04), and had higher frequency of ventricular extrasystoles/24 hours (700±2080 versus 103±460, P =0.003). During follow-up, SCD occurred in 4 patients, and additional 4 patients received appropriate ICD discharges. All 8 patients were LGE positive (event rate of 0.94%/y, P =0.01 versus LGE negative). Two additional heart failure-related deaths were recorded among LGE-positive patients. Univariate associates of SCD or appropriate ICD discharge were positive LGE ( P =0.002) and presence of nonsustained ventricular tachycardia ( P =0.04). The association of LGE with events remained significant after controlling for other risk factors. Conclusions— In patients with HCM, presence of LGE on CE-MRI was common and more prevalent among gene-positive patients. LGE was not associated with severe symptoms. However, LGE was strongly associated with surrogates of arrhythmia and remained a significant associate of subsequent SCD and/or ICD discharge after controlling for other variables. If replicated, LGE may be considered an important risk factor for sudden death in patients with HCM.
    Materialart: Online-Ressource
    ISSN: 1941-3289 , 1941-3297
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2010
    ZDB Id: 2428100-1
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 117, No. 21 ( 2008-05-27), p. 2776-2784
    Kurzfassung: Background— Bicuspid aortic valve is frequent and is reported to cause numerous complications, but the clinical outcome of patients diagnosed with normal or mildly dysfunctional valve is undefined. Methods and Results— In 212 asymptomatic community residents from Olmsted County, Minn (age, 32±20 years; 65% male), bicuspid aortic valve was diagnosed between 1980 and 1999 with ejection fraction ≥50% and aortic regurgitation or stenosis, absent or mild. Aortic valve degeneration at diagnosis was scored echocardiographically for calcification, thickening, and mobility reduction (0 to 3 each), with scores ranging from 0 to 9. At diagnosis, ejection fraction was 63±5% and left ventricular diameter was 48±9 mm. Survival 20 years after diagnosis was 90±3%, identical to the general population ( P =0.72). Twenty years after diagnosis, heart failure, new cardiac symptoms, and cardiovascular medical events occurred in 7±2%, 26±4%, and 33±5%, respectively. Twenty years after diagnosis, aortic valve surgery, ascending aortic surgery, or any cardiovascular surgery was required in 24±4%, 5±2%, and 27±4% at a younger age than the general population ( P 〈 0.0001). No aortic dissection occurred. Thus, cardiovascular medical or surgical events occurred in 42±5% 20 years after diagnosis. Independent predictors of cardiovascular events were age ≥50 years (risk ratio, 3.0; 95% confidence interval, 1.5 to 5.7; P 〈 0.01) and valve degeneration at diagnosis (risk ratio, 2.4; 95% confidence interval, 1.2 to 4.5; P =0.016; 〉 70% events at 20 years). Baseline ascending aorta ≥40 mm independently predicted surgery for aorta dilatation (risk ratio, 10.8; 95% confidence interval, 1.8 to 77.3; P 〈 0.01). Conclusions— In the community, asymptomatic patients with bicuspid aortic valve and no or minimal hemodynamic abnormality enjoy excellent long-term survival but incur frequent cardiovascular events, particularly with progressive valve dysfunction. Echocardiographic valve degeneration at diagnosis separates higher-risk patients who require regular assessment from lower-risk patients who require only episodic follow-up.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2008
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Online-Ressource
    Online-Ressource
    Ovid Technologies (Wolters Kluwer Health) ; 2002
    In:  Circulation Vol. 106, No. 11 ( 2002-09-10), p. 1355-1361
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 106, No. 11 ( 2002-09-10), p. 1355-1361
    Kurzfassung: Background— The outcome of mitral valve prolapse (MVP) is controversial, with marked discrepancies in reported complication rates. Methods and Results— We conducted a community study of all Olmsted County, Minn, residents first diagnosed with asymptomatic MVP between 1989 and 1998 (N=833). Diagnosis, motivated by auscultatory findings (n=557) or incidental (n=276), was always confirmed by echocardiography with the use of current criteria. End points analyzed during 4581 person-years of follow-up were mortality (n=96, 19±2% at 10 years), cardiovascular morbidity (n=171), and MVP-related events (n=109, 20±2% at 10 years). The most frequent primary risk factors for cardiovascular mortality were mitral regurgitation from moderate to severe ( P =0.002, n=131) and, less frequently, ejection fraction 〈 50% ( P =0.003, n=31). Secondary risk factors independently predictive of cardiovascular morbidity were slight mitral regurgitation, left atrium ≥40 mm, flail leaflet, atrial fibrillation, and age ≥50 years (all P 〈 0.01). Patients with only 0 or 1 secondary risk factor (n=430) had excellent outcome, with 10-year mortality of 5±2% ( P =0.17 versus expected), cardiovascular morbidity of 0.5%/y, and MVP-related events of 0.2%/y. Patients with ≥2 secondary risk factors (n=250) had mortality similar to expected ( P =0.20) but high cardiovascular morbidity (6.2%/y, P 〈 0.01) and notable MVP-related events (1.7%/y, P 〈 0.01). Patients with primary risk factors (n=153) showed excess 10-year mortality (45±9%, P =0.01 versus expected), high morbidity (18.5%/y, P 〈 0.01), and high MVP-related events (15%/y, P 〈 0.01). Conclusions— Natural history of asymptomatic MVP in the community is widely heterogeneous and may be severe. Clinical and echocardiographic characteristics allow separation of the majority of patients with excellent prognosis from subsets of patients displaying, during follow-up, high morbidity or even excess mortality as direct a consequence of MVP.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2002
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 104, No. 9 ( 2001-08-28), p. 976-978
    Kurzfassung: Background The early diastolic velocity of the mitral annulus (E′) is reduced in patients with diastolic dysfunction and increased filling pressures. Because transmitral inflow early velocity (E) increases progressively with higher filling pressures, E/E′ has been shown to have a strong positive relationship with pulmonary capillary wedge pressure (PCWP) and left ventricular end-diastolic pressure. However, previous studies have primarily involved patients without a pericardial abnormality. In constrictive pericarditis (CP), E′ is not reduced, despite increased filling pressures. This study evaluated the relationship between E/E′ and PCWP in patients with CP. Methods and Results We studied 10 patients (8 men; mean age, 64±7 years) with surgically confirmed CP. Doppler echocardiography was performed to measure early and late diastolic transmitral flow velocities. Tissue Doppler echocardiography was performed to measure E′. PCWP was measured with right heart catheterization. All patients were in sinus rhythm. Mean E and E′ were 91±15 cm/s and 11±4 cm/s, respectively. Mean PCWP was 25±6 mm Hg. E′ was positively correlated with PCWP ( r =0.69, P =0.027). There was a significant inverse correlation between E/E′ and PCWP ( r =−0.74, P =0.014). Despite high left ventricular filling pressures, E/E′ (mean, 9±4) was 〈 15 in all but 1 patient. Conclusions Paradoxical to the positive correlation between E/E′ and PCWP in patients with myocardial disease, an inverse relationship was found in patients with CP.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2001
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    Ovid Technologies (Wolters Kluwer Health) ; 2003
    In:  Arteriosclerosis, Thrombosis, and Vascular Biology Vol. 23, No. 2 ( 2003-02), p. 351-356
    In: Arteriosclerosis, Thrombosis, and Vascular Biology, Ovid Technologies (Wolters Kluwer Health), Vol. 23, No. 2 ( 2003-02), p. 351-356
    Kurzfassung: Objective— This study was undertaken to examine the association between bicuspid aortic valve (BAV) and aortic dilatation in the community. The association between BAV and aortic dilatation has been reported predominantly in retrospective studies in patients mostly with valvular dysfunction or selected surgical patients from tertiary referral centers. An independent association of BAV and aortic dilatation in a community-based study has not been demonstrated. Methods and Results— In a geographically defined population of Olmsted County, Minnesota, residents with BAV (n=44, age 35±13 years) without hemodynamically significant obstruction or regurgitation and matched controls with normal tricuspid aortic valves were identified by transthoracic echocardiography. The two groups were compared with respect to measurements of the aorta. The BAV and control groups differed with respect to size of the aortic anulus (23.2±2.4 versus 21.6±2.4 mm; P =0.002), aortic sinus (33.5±4.6 versus 30.3±4.1 mm; P =0.0001), and proximal ascending aorta (33.3±6.5 versus 27.9±3.6 mm; P =0.0001). There was no difference in the size of the aortic arch (24.2±3.6 versus 25.3±3.4 mm; P =0.16). These differences were maintained when the groups were stratified by sex and blood pressure. The relationship between bicuspid aortic valve and aortic dilatation was maintained when adjusting for factors related to fluid mechanics and hemodynamics such as systolic blood pressure, diastolic blood pressure, left ventricular ejection time, and peak aortic valve velocity. Conclusions— In a community-based study, BAV is associated with an alteration of aortic dimensions even in the absence of hemodynamically significant aortic valve stenosis or regurgitation.
    Materialart: Online-Ressource
    ISSN: 1079-5642 , 1524-4636
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2003
    ZDB Id: 1494427-3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 96, No. 10 ( 1997-11-18), p. 3409-3415
    Kurzfassung: Background Quantitative Doppler echocardiography and proximal flow convergence methods are validated techniques for quantifying mitral regurgitation. However, the clinical interpretation of the values calculated is hindered by the absence of calibration of ranges of severity in large numbers of patients. Methods and Results In 180 consecutive patients (men, 62%; mean age±SD, 66±11 years), the results of Doppler quantification of isolated mitral regurgitation were calibrated by use of left ventricular angiographic grading performed within 3 months in routine practice and without intervening events. The thresholds of the quantitative variables corresponding to the angiographic grades were identified by maximizing the sum of sensitivity and specificity and minimizing their difference. The mitral regurgitation grade by angiography was 2.7±1.3. The mean value and correlation with angiographic grades for effective regurgitant orifice were 43±37 mm and r =.79 ( P 〈 .0001); for regurgitant volume, 62±45 mL and r =.80 ( P 〈 .0001); and for regurgitant fraction, 45±17% and r =.78 ( P 〈 .0001). Despite some overlap, differences between mitral regurgitation grades were all significant (all P 〈 .05). The thresholds for severe mitral regurgitation (grade 4) were 60 mL, 50%, and 40 mm 2 for regurgitant volume, regurgitant fraction, and orifice, respectively. Conclusions In routine practice in large numbers of patients in a clinical laboratory, Doppler echocardiographic quantification of mitral regurgitation shows highly significant correlation with qualitative angiographic grades. Despite an expected overlap between classes, the calibration by angiography of grading ranges for the quantitative variables provides a framework for their interpretation and allows the definition in clinical practice of thresholds for severe mitral regurgitation.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 1997
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 99, No. 3 ( 1999-01-26), p. 400-405
    Kurzfassung: Background —Surgical correction of mitral regurgitation in patients with no or mild symptoms remains controversial, particularly because the impact of preoperative symptoms on postoperative outcome is unknown. Methods and Results —The long-term outcome of 478 patients with organic mitral regurgitation (199 in NYHA functional class I/II and 279 in class III/IV before surgery) operated on between 1984 and 1991 was analyzed. In patients in NYHA class I/II before surgery compared with those in class III/IV, postoperative long-term survival was higher (at 10 years, 76±5% versus 48±4%, P 〈 0.0001), with lower operative mortality (0.5% versus 5.4%, P =0.003) and better late survival ( P 〈 0.0001). Comparison of observed and expected survival showed identical curves in patients in class I/II before surgery ( P =0.18), whereas excess mortality was observed in patients in class III/IV before surgery ( P 〈 0.0001). Excess mortality associated with severe symptoms was also confirmed in all subgroups (all P 〈 0.003) and in multivariate analysis ( P =0.0036; adjusted hazard ratio [95% CI], 1.81 [1.21 to 2.70] ). Conclusions —In patients with organic mitral regurgitation, preoperative functional class III/IV symptoms are associated with excess short- and long-term postoperative mortality independently of all baseline characteristics. These data should lead to consideration of surgical correction of severe organic mitral regurgitation when no or minimal symptoms are present in patients at low operative risk, especially if repair is feasible.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 1999
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    Ovid Technologies (Wolters Kluwer Health) ; 1995
    In:  Circulation Vol. 92, No. 9 ( 1995-11), p. 2496-2503
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 92, No. 9 ( 1995-11), p. 2496-2503
    Kurzfassung: Background In patients with mitral regurgitation, surgical intervention produces immediate improvement in symptoms, but the long-term incidence and significance of postoperative congestive heart failure are unknown. Methods and Results The long-term outcome of 576 operative survivors of surgical correction of pure mitral regurgitation performed between 1980 and 1989 was analyzed. Survival was 77±2% and 56±3% at 5 and 10 years, respectively. Cumulative incidence of congestive heart failure was 23±2%, 33±3%, and 37±3% at 5, 10, and 14 years, respectively. Survival after the first episode of congestive heart failure was dismal, 44±4% at 5 years. Cause of congestive heart failure was left ventricular dysfunction in two thirds of the patients and valvular dysfunction in the other third. With multivariate analysis, the independent predictors of postoperative heart failure were preoperative ejection fraction ( P =.0001), coronary artery disease ( P =.0017), and New York Heart Association functional class ( P =.012), with borderline value for atrial fibrillation ( P =.10). The performance of valve repair was independently predictive of a lower incidence of the combined end point of death and heart failure ( P =.001), compared with valve replacement. Conclusions Congestive heart failure frequently occurs late after surgical correction of mitral regurgitation and portends dismal prognosis. This complication is due most often to left ventricular dysfunction; its main determinant is decreased left ventricular function preoperatively. These data should lead to earlier indication of surgical correction of mitral regurgitation, before left ventricular dysfunction occurs.
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 1995
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Online-Ressource
    Online-Ressource
    Ovid Technologies (Wolters Kluwer Health) ; 2006
    In:  Circulation Vol. 114, No. 10 ( 2006-09-05)
    In: Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 114, No. 10 ( 2006-09-05)
    Materialart: Online-Ressource
    ISSN: 0009-7322 , 1524-4539
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2006
    ZDB Id: 1466401-X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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