Magnetic Resonance Elastography in Patients With Abdominal Aortic Aneurysms
| Status: | Recruiting |
|---|---|
| Conditions: | Cardiology, Cardiology, Cardiology |
| Therapuetic Areas: | Cardiology / Vascular Diseases |
| Healthy: | No |
| Age Range: | 20 - Any |
| Updated: | 4/21/2016 |
| Start Date: | October 2014 |
| End Date: | October 2019 |
| Contact: | Barbara McCracken, CCRP |
| Email: | barbara.mccracken-bussa@osumc.edu |
| Phone: | 614-688-8934 |
The main objective of this study is to utilize Magnetic Resonance Elastography (MRE) to
determine tissue stiffness of abdominal aortic aneurysms (AAA). For patients with AAA, MRE
is a more sensitive and superior method of determining the risk for rupture of AAA based on
stiffness estimates when compared to the current, crude method of assessing risk based on
measurement of the diameter of the aneurysm. The investigators will also validate the
stiffness estimates against gold standard i.e. mechanical testing and histopathology only
AAA patients undergoing AAA surgery.
determine tissue stiffness of abdominal aortic aneurysms (AAA). For patients with AAA, MRE
is a more sensitive and superior method of determining the risk for rupture of AAA based on
stiffness estimates when compared to the current, crude method of assessing risk based on
measurement of the diameter of the aneurysm. The investigators will also validate the
stiffness estimates against gold standard i.e. mechanical testing and histopathology only
AAA patients undergoing AAA surgery.
Currently, MRE is a clinical tool used to assess hepatic fibrosis at many institutions. MRE
is superior to invasive techniques (i.e. biopsies) and mechanical testing in that it is
noninvasive and can be performed in vivo under physiologic conditions. MRE could make
diagnosing stiffness widely available and could revolutionize the diagnosis and treatment of
numerous other diseases affecting stiffness of soft tissues.
Aortic wall "stiffness" is a fundamental biomechanical parameter that reflects the
structural integrity of normal and aneurysmal aortic tissue. AAAs enlarge over time leading
to sudden rupture and death in up to 90% of patients. Surgical or endovascular aneurysm
repair (EVAR) is recommended for AAAs > 5.5 cm in diameter. However, previous studies have
reported a high percentage (13%) of smaller AAAs (<5 cm) go on to rupture, and an even
higher percentage (60%) of larger AAAs (>5 cm) remain stable. Despite the poor prognostic
value of aortic diameter, it is still the primary parameter used to time surgical repair. It
is known that changes in stiffness of AAA can reveal important information on extra-cellular
matrix content; a key factor in the pathophysiological development of AAA and the risk for
rupture. A non-invasive, spatially resolved estimate of aortic stiffness may provide a
superior determinant of the risk for rupture compared to the currently used anatomical
measures. The relationship between non-invasively measured wall stiffness (WS) and the
structural integrity of the aortic wall must be further elucidated. Therefore, aortic MRE
can be used as a noninvasive tool to estimate the stiffness of AAAs and can provide superior
diagnostic and prognostic information in patients with developing AAA disease.
Entry to this study is open to men and women aged 18 years and older, and to all racial and
ethnic subgroups. Two separate groups of patients with AAA will be recruited. One group will
be patients who have been diagnosed with AAA and are monitored to observe the size of the
AAA. The other group is comprised of patients who are scheduled for surgical repair of AAA.
is superior to invasive techniques (i.e. biopsies) and mechanical testing in that it is
noninvasive and can be performed in vivo under physiologic conditions. MRE could make
diagnosing stiffness widely available and could revolutionize the diagnosis and treatment of
numerous other diseases affecting stiffness of soft tissues.
Aortic wall "stiffness" is a fundamental biomechanical parameter that reflects the
structural integrity of normal and aneurysmal aortic tissue. AAAs enlarge over time leading
to sudden rupture and death in up to 90% of patients. Surgical or endovascular aneurysm
repair (EVAR) is recommended for AAAs > 5.5 cm in diameter. However, previous studies have
reported a high percentage (13%) of smaller AAAs (<5 cm) go on to rupture, and an even
higher percentage (60%) of larger AAAs (>5 cm) remain stable. Despite the poor prognostic
value of aortic diameter, it is still the primary parameter used to time surgical repair. It
is known that changes in stiffness of AAA can reveal important information on extra-cellular
matrix content; a key factor in the pathophysiological development of AAA and the risk for
rupture. A non-invasive, spatially resolved estimate of aortic stiffness may provide a
superior determinant of the risk for rupture compared to the currently used anatomical
measures. The relationship between non-invasively measured wall stiffness (WS) and the
structural integrity of the aortic wall must be further elucidated. Therefore, aortic MRE
can be used as a noninvasive tool to estimate the stiffness of AAAs and can provide superior
diagnostic and prognostic information in patients with developing AAA disease.
Entry to this study is open to men and women aged 18 years and older, and to all racial and
ethnic subgroups. Two separate groups of patients with AAA will be recruited. One group will
be patients who have been diagnosed with AAA and are monitored to observe the size of the
AAA. The other group is comprised of patients who are scheduled for surgical repair of AAA.
Inclusion Criteria:
- Must be able to lie flat on their back in the scanner for up to 60 minutes
- Must be able to hold breath for up to 15 seconds
Exclusion Criteria:
- Patients who are claustrophobic
- Patients who are pregnant
- Patients with any unapproved, non-MRI save metal/devices in or on their body
We found this trial at
1
site
Columbus, Ohio 43210
Principal Investigator: Arunark Kolipaka, PhD
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