Stella Marchetta

Echocardiographic reference ranges for normal left ventricular 2D strain: results from the EACVI NORRE study

Aims To obtain the normal ranges for 2D echocardiographic (2DE) measurements of left ventricular (LV) strain from a large group of healthy volunteers accounting for age and gender. Methods and results A total of 549 (mean age: 45.6 ± 13.3 years) healthy subjects were enrolled at 22 collaborating institutions of the Normal Reference Ranges for Echocardiography (NORRE) study. 2DE data sets have been analysed with a vendor-independent software package allowing homogeneous measurements irrespective of the echocardiographic equipment used to acquire the data sets. The lowest expected values of LV strains and twist calculated as ± 1.96 standard deviations from the mean were -16.7% in men and -17.8% in women for longitudinal strain, -22.3% and -23.6% for circumferential strain, 20.6% and 21.5% for radial strain, and 2.2 degrees and 1.9 degrees for twist, respectively. In multivariable analysis, longitudinal strain decreased with age whereas the opposite occurred with circumferential and radial strain. Male gender was associated with lower strain for longitudinal, circumferential, and radial strain. Inter-vendor differences were observed for circumferential and radial strain despite the use of vendor-independent software. Importantly, no intervendor differences were noted in longitudinal strain. Conclusion The NORRE study provides contemporary, applicable 2D echocardiographic reference ranges for LV longitudinal, radial, and circumferential strain. Our data highlight the importance of age- and gender-specific reference values for LV strain.

Echocardiographic reference ranges for normal left atrial function parameters: results from the EACVI NORRE study

Aims To obtain the normal ranges for echocardiographic measurements of left atrial (LA) function from a large group of healthy volunteers accounting for age and gender. Methods and results A total of 371 (median age 45 years) healthy subjects were enrolled at 22 collaborating institutions collaborating in the Normal Reference Ranges for Echocardiography (NORRE) study of the European Association of Cardiovascular Imaging (EACVI). Left atrial data sets were analysed with a vendor-independent software (VIS) package allowing homogeneous measurements irrespective of the echocardiographic equipment used to acquire data sets. The lowest expected values of LA function were 26.1%, 48.7%, and 41.4% for left atrial strain (LAS), 2D left atrial emptying fraction (LAEF), and 3D LAEF (reservoir function); 7.7%, 24.2%, and -0.53/s for LAS-active, LAEF-active, and LA strain rate during LA contraction (SRa) (pump function) and 12.0% and 21.6% for LAS-passive and LAEF-passive (conduit function). Left atrial reservoir and conduit function were decreased with age while pump function was increased. All indices of reservoir function and all LA strains had no difference in both gender and vendor. However, inter-vendor differences were observed in LA SRa despite the use of VIS. Conclusion The NORRE study provides contemporary, applicable echocardiographic reference ranges for LA function. Our data highlight the importance of age-specific reference values for LA functions.

Outcomes of Patients With Asymptomatic Aortic Stenosis Followed Up in Heart Valve Clinics

Importance The natural history and the management of patients with asymptomatic aortic stenosis (AS) have not been fully examined in the current era. Objective To determine the clinical outcomes of patients with asymptomatic AS using data from the Heart Valve Clinic International Database. Design, Setting, and Participants This registry was assembled by merging data from prospectively gathered institutional databases from 10 heart valve clinics in Europe, Canada, and the United States. Asymptomatic patients with an aortic valve area of 1.5 cm2 or less and preserved left ventricular ejection fraction (LVEF) greater than 50% at entry were considered for the present analysis. Data were collected from January 2001 to December 2014, and data were analyzed from January 2017 to July 2018. Main Outcomes and Measures Natural history, need for aortic valve replacement (AVR), and survival of asymptomatic patients with moderate or severe AS at entry followed up in a heart valve clinic. Indications for AVR were based on current guideline recommendations. Results Of the 1375 patients included in this analysis, 834 (60.7%) were male, and the mean (SD) age was 71 (13) years. A total of 861 patients (62.6%) had severe AS (aortic valve area less than 1.0 cm2). The mean (SD) overall survival during medical management (mean [SD] follow up, 27 [24] months) was 93% (1%), 86% (2%), and 75% (4%) at 2, 4, and 8 years, respectively. A total of 104 patients (7.6%) died under observation, including 57 patients (54.8%) from cardiovascular causes. The crude rate of sudden death was 0.65% over the duration of the study. A total of 542 patients (39.4%) underwent AVR, including 388 patients (71.6%) with severe AS at study entry and 154 (28.4%) with moderate AS at entry who progressed to severe AS. Those with severe AS at entry who underwent AVR did so at a mean (SD) of 14.4 (16.6) months and a median of 8.7 months. The mean (SD) 2-year and 4-year AVR-free survival rates for asymptomatic patients with severe AS at baseline were 54% (2%) and 32% (3%), respectively. In those undergoing AVR, the 30-day postprocedural mortality was 0.9%. In patients with severe AS at entry, peak aortic jet velocity (greater than 5 m/s) and LVEF (less than 60%) were associated with all-cause and cardiovascular mortality without AVR; these factors were also associated with postprocedural mortality in those patients with severe AS at baseline who underwent AVR (surgical AVR in 310 patients; transcatheter AVR in 78 patients). Conclusions and Relevance In patients with asymptomatic AS followed up in heart valve centers, the risk of sudden death is low, and rates of overall survival are similar to those reported from previous series. Patients with severe AS at baseline and peak aortic jet velocity of 5.0 m/s or greater or LVEF less than 60% have increased risks of all-cause and cardiovascular mortality even after AVR. The potential benefit of early intervention should be considered in these high-risk patients.

Management of Asymptomatic Severe Degenerative Mitral Regurgitation

ABSTRACT The decision for surgery in the management of asymptomatic severe degenerative mitral regurgitation (MR) is about doing the right thing at the right time and place. European and American guidelines have provided us with guidance on surgical indications, albeit with different levels of recommendations. However, the timing for surgery especially in asymptomatic patients not meeting Class I indications for intervention, i.e. no evidence of left ventricular dysfunction is still avidly debated. In this review, we will present the literature on the indications and timing of surgical intervention in asymptomatic severe MR, covering guidelines from both societies. We will also touch on the emerging role of other imaging techniques, biomarkers and exercise stress testing. Finally, we will present arguments for and against both management strategies, i.e. early surgery and watchful waiting. To summarize, the management of patients with asymptomatic severe degenerative MR should be a joint decision between all members of the Heart Team and tailored according to the availability of surgical expertise, patient’s surgical risk and patient’s wishes.

Exercise Testing in Mitral Regurgitation

Mitral regurgitation (MR) is the second most common valvular heart disease referred for corrective surgery. Diagnostic and management dilemmas are not uncommon when dealing with MR patients. Exercise testing plays an important role in sorting out some of these clinical challenges. In primary asymptomatic MR, exercise testing allows symptom assessment, confident link of symptoms to valve disease severity, safe deferral of surgery for the next 1-year in patients with preserved exercise capacity, insights into the mechanism of exercise-induced dyspnea and helps in individual risk stratification. Moreover, exercise testing in the form of exercise stress echocardiography is also useful in the evaluation of patients with secondary ischemic MR for risk stratification as well as for the detection of patients with moderate ischemic MR in whom mitral valve repair at the time of surgical revascularization may add benefit.

Exercise Doppler echocardiography for the diagnosis of pulmonary hypertension: renewed interest and evolving roles

Exercise-induced pulmonary hypertension (PHT) was defined historically as an increase of >30 mmHg in the mean pulmonary artery pressure (MPAP) during exercise in patients who otherwise had a normal MPAP at rest (1). This concept was adopted for almost two decades before it was dropped from the diagnostic criteria of PHT in 2008 following the 4th World Symposium on PHT due to the ambiguity in the cut-off values for abnormality (2). In recent years, however, the tide might have turned. New and improved definitions for exercise PHT have been proposed and validated in a variety of patient cohorts, generating interest and bringing exercise PHT back into the limelight (3,4). As the latest iteration of the World Symposium on PHT in Nice approaches, this paper by van Riel et al. is both timely and relevant.

RADIONUCLIDE IMAGING OF INFECTIVE ENDOCARDITIS: state of art and future perspective

Purpose of ReviewInfectious endocarditis is a serious disease requiring rapid diagnosis and accurate risk stratification to offer the best therapeutic strategy. Infection of prosthetic valve (PV) and cardiovascular implantable electronic device (CIED) is increasing due to the ageing of the population and the growing number of implants. Foreign material infection remains clinically challenging given the limitation of ultrasound techniques in this context whereas the diagnosis must be precocious.Recent Findings18F-fluorodeoxyglucose positron emission tomography/computed tomography ([18F]FDG PET/CT) and radiolabelled leukocytes single-photon emission computed tomography/computed tomography (SPECT/CT) are commonly used for this purpose.Summary In the present article, we summarized the available evidence for the use of nuclear imaging for the evaluation of infectious endocarditis.

What Does 3D Echocardiography Add to 2D Echocardiography in the Assessment of Mitral Regurgitation

Purpose of ReviewThe purpose of this review was to elucidate the additional value of 3D echocardiography for the assessment of mitral regurgitation (MR) compared to standard 2D echocardiography.Recent Findings3D echocardiography provides key information, aetiology, degenerative mitral valve disease vs. secondary MR, causes and mechanism, severity by measurements of effective regurgitant orifice area and regurgitant volume; likelihood of reparability and assessment of pre- and intra-mitral valve transcatheter procedures.Summary3D echocardiography as a promising method for assessment of MR is useful and crucial for research, clinical practice and patient management in all heart valve team members.

Exercise echocardiography in valve disease

Evidence supporting the use of exercise echocardiography to identify the true hemodynamic consequences of valvular heart disease (VHD) is progressively accumulating. From a clinical standpoint, the evaluation of VHD limited to resting conditions often underestimates the full clinical impact of the lesion. Exercise echocardiography has proved to be an important clinical tool in the risk stratification and the decision making of patients with VHD. It is very useful in case of discrepancy between symptoms and severity of valve lesion. Moreover, the evaluation of dynamic components of VHD, ventricular function, and exercise capacity provides clinician additive prognostic value that can be really helpful in the management planning of these patients.

Multimodality imaging for the diagnosis and assessment of aortic stenosis severity

ABSTRACT Introduction: Aortic stenosis (AS) is the most common cause of valvular heart disease. Imaging plays a major role in the diagnosis and evaluation of AS severity. Areas covered: The present review focuses on new emerging concepts in AS by stressing the substantial value of imaging into the understanding of the complex pathophysiology and management of AS. Expert commentary: Though, standard 2D echocardiography is often diagnostic multi-modality imaging can be required in patients with doubtful results or to refine the evaluation of AS.