Noninvasive Elastography Evaluation of Myocardial Stiffness in Elderly Patients With Isolated Diastolic Heart Failure: New Diagnostic Tool?

Study Overview
=================
Brief Summary
-----------------
The new approach propose in this protocol is based on ultrafast ultrasound and remote palpation of tissue by ultrasonic radiation pressure. Ultrafast ultrasound of biological tissues is based on an innovative ultrasound imaging approach that can image very fast soft tissue events at a rate of several thousands of frames per second and provide quantitative mapping of the elasticity of the tissues. This current project aims is to focus on myocardial rigidity in diastole to better assess the function of the heart failure.

Detailed Description
-----------------
Diastolic heart failure or heart failure with preserved systolic function is the leading cause of heart failure in elderly subjects (more than 2/3 of heart failure in subjects over 60 years). Its main etiology is high blood pressure. Diagnosis of diastolic heart failure remains controversial in clinical practice. It is based on ultrasound and biological criteria. These are mainly acute edema of the lung for patients with preserved Ejection Fraction and high Brain Natriuretic Peptid. It is now recognized that the primum movens of this type of heart failure is the increase in myocardial stiffness secondary to left ventricular hypertrophy. The noninvasive evaluation of this parameter would allow a more accurate and reliable diagnosis since it does not depend on the loading conditions, unlike the heart failure and the trans-mitral Doppler). However, the absence of a non-invasive tool for the direct evaluation of diastolic (so-called passive) rigidity prevents the use of this diagnostic parameter. Investigators propose here to non-invasively evaluate the myocardial stiffness in the elderly patient with diastolic heart failure thanks to a new imaging tool using an innovative ultrasonic technology, the ultrafast-echo associated with its elastographic mode ShearWave Imaging. Investigators have been working for several years in collaboration with the Langevin Institute on this technology, which has recently been validated on experimental models. Its principle is based on the creation of a shear wave from a standard ultrasound probe and the calculation of the velocity of this wave thanks to the very high temporal resolution of the ultrasound system, this speed being correlated to the myocardial rigidity. The human study was recently made possible by the development of a phased array probe with the ability to work with the elastography mode (ShearWave Imaging).

Official Title
-----------------
Noninvasive Elastography Evaluation of Myocardial Stiffness in Elderly Patients With Isolated Diastolic Heart Failure: New Diagnostic Tool?

Conditions
-----------------
Cardiovascular Diseases in Old Age

Intervention / Treatment
-----------------
* Diagnostic Test: SuperSonic image


Participation Criteria
=================
Eligibility Criteria
-----------------
Global Inclusion Criteria: Hospitalization in cardiology services for acute pulmonary edema during heart failure Natriuretic peptide type B ≥35 pg/ml Echocardiographic structural alteration Specific Inclusion criteria Group preserved LVEF: Left ventricular Ejection Fraction ≥50% Group moderate alteration of LVEF: Left ventricular Ejection Fraction between 40% and 49% Group Systolic heart failure: Left ventricular Ejection Fraction< 40% Global Exclusion Criteria: Other associated lung pathology Other heart disease Contraindication to MRI or echocardiography gel Pregnancy Poor echogenicity,

Ages Eligible for Study
-----------------
Minimum Age: 60 Years
Maximum Age: 80 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Interventional Model Description: stratification
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Stratification<br>All patient will have the same intervention. They will be stratified regarding their degree of heart failure gravity. | Diagnostic Test: SuperSonic image<br>* 3 examen performed assessed to compared evaluation type: Cardiac magnetic resonance imaging, standard ultrasound imaging and ultrafast imaging<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Myocardial rigidity assessment | Myocardial rigidity measured using this new non-invasive ultrasound imaging technique. | Day 1 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Norms estimation of myocardial rigidity | Estimation of physiological and pathological norms of myocardial rigidity by elastography | Day 1 | 
| Safety of cardiac elastography | patient monitoring (electrocardiogram scope and constants every10 min) for 30 minutes post-examination associated with a comfort questionnaire to be completed by the patient after the examination | Day 1 | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
heart failure, myocardial rigidity, new diagnosis, ultrasound imaging