Dataset Information

Delayed Time to Peak Velocity Is Useful for Detecting Severe Aortic Stenosis.

ABSTRACT:

Background

Time to peak velocity (TPV) is an echocardiographic variable that can be easily measured and reflects a late peaking murmur, a classic physical finding suggesting severe aortic stenosis (AS). The aim of this study was to investigate the usefulness of TPV to evaluate AS severity.

Methods and results

This study included 700 AS patients, whose aortic valve area (AVA) was <1.5 cm², and 200 control patients. The TPV was defined as the time from aortic valve opening to when the flow velocity across the aortic valve reaches its peak. AS severity was classified as follows: High gradient severe AS, mean pressure gradient ?40 mm Hg and AVA index (AVAI) <0.6 cm²/m²; Low gradient severe AS, mean pressure gradient <40 mm Hg, AVAI <0.6 cm²/m², and dimensionless index <0.25; moderate AS, mean pressure gradient <40 mm Hg, AVAI ?0.6 cm²/m². The area under the receiver operating characteristic curve of TPV to predict high gradient severe AS was 0.94 (95% CI: 0.92-0.97, P<0.001). TPV was significantly delayed in low gradient severe AS compared with moderate AS both in patients with preserved (102±13 ms versus 83±13 ms, P<0.001) and with reduced ejection fraction (110±18 ms versus 88±13 ms, P<0.001). Delayed TPV was associated with increased all-cause mortality or need for aortic valve replacement after adjustment for confounders (hazard ratio for first quartile, reference is fourth quartile: 7.31, 95% CI 4.26-12.53, P<0.001).

Conclusions

TPV is useful to evaluate AS severity and predict poor prognosis of AS patients.

SUBMITTER: Kamimura D

PROVIDER: S-EPMC5121493 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Publications

Delayed Time to Peak Velocity Is Useful for Detecting Severe Aortic Stenosis.

Kamimura Daisuke D Hans Sartaj S Suzuki Takeki T Fox Ervin R ER Hall Michael E ME Musani Solomon K SK McMullan Michael R MR Little William C WC

Journal of the American Heart Association 20161022 10

<h4>Background</h4>Time to peak velocity (TPV) is an echocardiographic variable that can be easily measured and reflects a late peaking murmur, a classic physical finding suggesting severe aortic stenosis (AS). The aim of this study was to investigate the usefulness of TPV to evaluate AS severity.<h4>Methods and results</h4>This study included 700 AS patients, whose aortic valve area (AVA) was <1.5 cm<sup>2</sup>, and 200 control patients. The TPV was defined as the time from aortic valve openin ...[more]

PMID: 27792660

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Project description:BACKGROUND:Aortic valve replacement (AVR) for aortic stenosis is timed primarily on the development of symptoms, but late surgery can result in irreversible myocardial dysfunction and additional risk. The aim of this study was to determine whether the presence of focal myocardial scar preoperatively was associated with long-term mortality. METHODS:In a longitudinal observational outcome study, survival analysis was performed in patients with severe aortic stenosis listed for valve intervention at 6 UK cardiothoracic centers. Patients underwent preprocedural echocardiography (for valve severity assessment) and cardiovascular magnetic resonance for ventricular volumes, function and scar quantification between January 2003 and May 2015. Myocardial scar was categorized into 3 patterns (none, infarct, or noninfarct patterns) and quantified with the full width at half-maximum method as percentage of the left ventricle. All-cause mortality and cardiovascular mortality were tracked for a minimum of 2 years. RESULTS:Six hundred seventy-four patients with severe aortic stenosis (age, 75±14 years; 63% male; aortic valve area, 0.38±0.14 cm2/m2; mean gradient, 46±18 mm?Hg; left ventricular ejection fraction, 61.0±16.7%) were included. Scar was present in 51% (18% infarct pattern, 33% noninfarct). Management was surgical AVR (n=399) or transcatheter AVR (n=275). During follow-up (median, 3.6 years), 145 patients (21.5%) died (52 after surgical AVR, 93 after transcatheter AVR). In multivariable analysis, the factors independently associated with all-cause mortality were age (hazard ratio [HR], 1.50; 95% CI, 1.11-2.04; P=0.009, scaled by epochs of 10 years), Society of Thoracic Surgeons score (HR, 1.12; 95% CI, 1.03-1.22; P=0.007), and scar presence (HR, 2.39; 95% CI, 1.40-4.05; P=0.001). Scar independently predicted all-cause (26.4% versus 12.9%; P<0.001) and cardiovascular (15.0% versus 4.8%; P<0.001) mortality, regardless of intervention (transcatheter AVR, P=0.002; surgical AVR, P=0.026 [all-cause mortality]). Every 1% increase in left ventricular myocardial scar burden was associated with 11% higher all-cause mortality hazard (HR, 1.11; 95% CI, 1.05-1.17; P<0.001) and 8% higher cardiovascular mortality hazard (HR, 1.08; 95% CI, 1.01-1.17; P<0.001). CONCLUSIONS:In patients with severe aortic stenosis, late gadolinium enhancement on cardiovascular magnetic resonance was independently associated with mortality; its presence was associated with a 2-fold higher late mortality.

Dataset Information

Delayed Time to Peak Velocity Is Useful for Detecting Severe Aortic Stenosis.

Background

Methods and results

Conclusions

Publications

Delayed Time to Peak Velocity Is Useful for Detecting Severe Aortic Stenosis.

Similar Datasets

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