Analysis of RV-Dysfunction in Fallot Patients

Study Overview
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Brief Summary
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In the presented study TDI will be used as a modern technique to characterize RV-function in Fallot patients at rest and during different exercise conditions.

Detailed Description
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Tissue Doppler imaging (TDI) presents a modern technique to depict the velocity of tissue motion within a distinct area of the myocardium providing amendatory characterization of diastolic and systolic function of the heart. TDI is hypothesized to be of additional value in the evaluation of adult congenital heart disease, especially tetralogy of Fallot (TOF), which is one of the most common conditions. In particular, Fallot patients are at risk of developing right ventricular (RV) dysfunction due to pulmonary valve defects or alterations of the outflow tract. It is pivotal to recognize this progression at an early stage before irreversible changes occur. Aim of the study is to test feasibility of TDI in Fallot patients as a new technique that provides new parameters to characterize RV dysfunction, more precise than common methods. Additionally TDI is performed at rest and during different endurance testings (passive Leg Raising (PLR), handgrip (HG) and cardiopulmonary exercise (CPX), as certain changes might be compensated at rest, first apparent during exercise.

Official Title
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Tissue Doppler Imaging - A Promising Technique To Assess Myocardial Function In Adult Fallot Patients

Conditions
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Tetralogy of Fallot

Intervention / Treatment
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* Other: Transthoracic echocardiography at rest, during PLR, HG and CPX (including blood gas analysis in both groups). Additionally Fallot patients will undergo routine blood testings.


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with corrected tetralogy of Fallot Adult healthy controls without cardiovascular disease or other relevant systemic diseases with written consent Exclusion Criteria: Inability to give written consent, incapable of cycling or handgrip exercise due to cognitive or orthopedic limitation, poor echocardiographic image quality

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Transthoracic echocardiography including TDI is performed at rest, during PLR, HG and CPX in Fallot patients and healthy controls. In Fallot patients, transthoracic ultrasound at rest and during CPX are part of the routinely follow-up. PLR and HG were performed additionally as part of the investigator's study to analyze TDI parameters during various endurance testings
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Fallot patients<br>Fallot patients | Other: Transthoracic echocardiography at rest, during PLR, HG and CPX (including blood gas analysis in both groups). Additionally Fallot patients will undergo routine blood testings.<br>* Transthoracic echocardiography at rest, during PLR, HG and CPX (including blood gas analysis in both groups). Additionally Fallot patients will undergo routine blood testings.<br>|
| Experimental: healthy controls<br>healthy volunteers | Other: Transthoracic echocardiography at rest, during PLR, HG and CPX (including blood gas analysis in both groups). Additionally Fallot patients will undergo routine blood testings.<br>* Transthoracic echocardiography at rest, during PLR, HG and CPX (including blood gas analysis in both groups). Additionally Fallot patients will undergo routine blood testings.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Right ventricular myocardial velocity | Right ventricular myocardial velocity during early diastole (cm/s) Right ventricular myocardial velocity during late diastole (cm/s) Right ventricular myocardial velocity during systole (cm/s) baseline (one time point, measurements are performed at rest and during exercise) | Baseline | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Peak oxygen consumption (ml/min/kg) and Oxygen consumption at anaerobic threshold (ml/min/kg) | CPX is performed for the measurement of TDI velocities at peak exercise, as well as for the assessment of the participants´ cardiopulmonary status. For the latter, the focus lies on oxygen consumption at peak exercise and at anaerobic threshold | Baseline | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Tetralogy of Fallot, Tissue Doppler Imaging, Exercise testing