Double Inlet Left Ventricle Clinical Trial
Official title:
Survival of Double Inlet Left Ventricle Patients Without Fontan Circulation: Intracardiac Anatomy and Hemodynamics, Functional Status and Quality of Life
Patients with univentricular hearts are currently palliated with the Fontan procedures. This
results in an unphysiologic circulation with poor long-term survival. On the other hand there
is a small, selected subgroup of patients with univentricular hearts of the double inlet left
ventricle (DILV) type that survives up to old age without ever having undergone any Fontan
procedures. Considering the relatively bleak data on long-term survival of DILV patients
palliated with the Fontan procedure, it seems highly relevant to investigate and determine
factors that allow a selection of unoperated patients to live to a comparatively high age
without apparent major complaints. This might have an impact on how (and if, at all) certain
univentricular patients are selected for operation in the future. For some, a different
surgical procedure, or even therapeutic nihilism might be a more viable alternative.
The investigators hypothesise that favourable intracardiac streaming plays a role in making
these patients viable: certain intracardiac anatomical characteristics allow for favourable
flow patterns.
The primary objective of this study is to describe the intracardiac anatomy and hemodynamics
of DILV patients without Fontan circulation using 4D MRI. Furthermore, the functional status
and quality of life of these patients will be assessed.
Rationale: Patients with univentricular hearts are currently palliated with a sequence of
operations known as the Fontan procedure. This results in an un-physiologic circulation with
poor long-term survival. On the other hand there is a small, selected subgroup of patients
with univentricular hearts of the double inlet left ventricle (DILV) type that survives up to
old age without ever having undergone any Fontan procedure. Considering the relatively bleak
data on long-term survival of DILV patients palliated with the Fontan procedure, it is highly
relevant to investigate and determine factors that allow for a selection of unoperated
patients to live to a comparatively high age without apparent major complaints. This might
have an impact on how (and if, at all) certain univentricular patients will be selected for
operation in the future. For some, a different surgical procedure, or even therapeutic
nihilism might be a more viable alternative. The investigators hypothesize that favourable
intracardiac streaming plays a role in making the unpalliated patients viable: certain
intracardiac anatomical characteristics allow for favourable flow patterns, resulting in
higher systemic oxygen saturations than expected by mixing pulmonary and systemic venous
returns.
Objective: The primary objective of this study is to describe the intracardiac anatomy and
hemodynamics of DILV patients without Fontan circulation using 4D MRI. Furthermore, the
functional status and quality of life of these patients will be assessed and compared to a
matched cohort of Fontan patients.
Study design: This will be an observational, cross-sectional study. The investigators aim to
include all DILV patients without Fontan circulation known at the congenital heart disease
referral centers in the Netherlands and Flanders. The Dutch patients will undergo one 4D MRI,
a physical examination, cardiopulmonary exercise testing and have a blood sample taken at the
University Medical Center Utrecht. The patients from the Flemish referral centers will
undergo the same protocol at the University Medical Center Leuven. Furthermore, patients over
the age of 18 will be asked to fill out a quality of life questionnaire.
Study population: Included will be patients over the age of 12 with the diagnosis double
inlet left ventricle, which have not undergone the Fontan trajectory. For the 4D MRI,
patients with an MRI non-compatible pacemaker in situ will be excluded.
Main study parameters/endpoints: This is primarily an explorative study aiming to describe
the anatomy of unpalliated DILV hearts of patients without Fontan palliation. With 4D MRI,
the hearts will be grouped according to the angular relationship of the two lines connecting
the atrioventricular and the ventriculo-arterial valves. This angle can be divided into three
categories: 1) parallel (i.e. 0°), 2) perpendicular (i.e. 90°) or 3) an in-between variant.
Accordingly, flow patterns, ranging from linear to turbulent will be measured and correlated
to the anatomical variants.
Nature and extent of the burden and risks associated with participation, benefit and group
relatedness: The burden and risks associated with participation in this study are minimal.
Patients need to visit the site of investigation only once, and the tests done at the visit
(i.e. 4D MR imaging, exercise and pulmonary function testing and blood sample) are part of
standard medical care and as such pose negligible risk on the patients. The quality of life
survey is not part of standard medical care and might be confrontational on a psychological
level. It is, however, a widely used and scientifically approved survey, which aims to keep
this burden very low. Due to the extremely low prevalence of the condition to be studied, it
is of great importance to include every single patient, including children under the age of
18. Excluding children from this study would further decrease the sample size to a
significantly smaller number, making it difficult to draw conclusions.
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| Status | Clinical Trial | Phase | |
|---|---|---|---|
| Terminated |
NCT01107990 -
Global and Regional Myocardial Strain and Power Output In Patients With Single Ventricles Using Novel MRI Techniques
|