Coarctation of AortaNCT05362721
PV Loop & Coarctation Study
An observational study of Coarctation of Aorta, run by University of Minnesota at 7 sites in United States.
Trial summary
Coarctation of the aorta accounts for 4-7% of all congenital heart disease. While stent therapy, when feasible, is the standard of care for coarctation, it may not completely improve the work (and afterload) of the heart due to its effects on the elasticity of the aorta. Read more about this study
- Who is it for?
- Ages 6 years and older
- Conditions the study is for
- Coarctation of Aorta
- What is being tested?
- Pressure-volume loop catheter
- How many people
- 21 participants
- Where
- 7 sitesUnited States
- Study dates
- 4 Jun 2019to 31 Dec 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 6 years and older
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Study population: Patients referred for elective cardiac catheterization and stent therapy for coarctation
Who may be able to join
- Children 6 years of age and older and adults of all races and both sexes referred for elective cardiac catheterization and stent therapy for coarctation
- Those who provide informed consent for study participant.
Who cannot join
- Children who undergo other interventions in addition to the coarctation
- Children with single ventricle physiology.
- Renal impairment
- Participant unwilling to sign a consent form.
Trial locations and contacts
7 sites in 1 country.
7 sites in 1 country
United States7 sites
Children's Hospital of Boston
Boston, Massachusetts, 02115
Cincinnati Children's Hospital
Cincinnati, Ohio, 45229
University of Texas-Southwestern
Dallas, Texas, 75390
Helen DeVos Children's Hospital
Grand Rapids, Michigan, 49503
Children's Mercy Hospital
Kansas City, Missouri, 64108
Children's Hospital of Los Angeles
Los Angeles, California, 90027
University of Minnesota
Minneapolis, Minnesota, 55455
About this study
Official title: Assessment of the Impact of Transcatheter Stenting of Aortic Coarctation on the Left Ventricular Afterload and Work Using Left Ventricular Pressure Volume Loops
Coarctation of the aorta accounts for 4-7% of all congenital heart disease. While stent therapy, when feasible, is the standard of care for coarctation, it may not completely improve the work (and afterload) of the heart due to its effects on the elasticity of the aorta. This study will provide the information needed to understand the effects of current management on the cardiac mechanics and work.
- Conditions
- Coarctation of Aorta
- Being tested
- Pressure-volume loop catheter
- Keywords
- Coarctation of Aorta, COA
- Medical subject headings
- Aortic Coarctation
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Pressure-volume loop catheterDiagnostic test
The cardiac catheterization procedure will be done according to standard protocol as part of the standard clinical care. This has become the standard of care in any patient in which it feasible and is performed with low risk.
| Study group | Role | What they receive |
|---|---|---|
| Pressure-volume loop catheter | Not described Receives: Diagnostic Test: Pressure-volume loop catheter |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in left ventricular afterload measured by arterial elastance
Arterial elastance (Ea) is measured by the pressure volume (PV) loop catheter in the left ventricle. The PV loop catheter measures pressure and volume simultaneously during the entire cardiac cycle. Arterial elastance is a measure of ventricular afterload and will be calculated using previously described formula;
Ea (arterial elastance): Ea = Pend systole/ SV
(where P, is pressure at end systole, and SV is stroke volume).
Elastance will be reported as a continuous variable in mmHg/mL with a higher number indicating an increase in elastance and a negative number indicating a decrease in elastance. Change in elastance before and after stent placement will be compared using paired T test.
Measured: Immediately following intervention
Secondary outcomes (3)
Change in left ventricular performance measured by ESPVR
The end systolic pressure volume relationship (ESPVR) summarizes ventricular systolic function and is measured as a slope of End systolic ventricular elastance (Ees) and volume-axis intercept Vo such that ESP = Ees (ESV-Vo) (ESP = end-systolic pressure, ESV = end-systolic volume, Vo represents the unstressed volume, which is the volume required to fill the ventricle before pressure rises). Shifts of the ESPVR occur with changes in ventricular contractility such that increases in contractility are associated with upward/leftward shifts of the ESPVR. ESPVR is obtained by analysing the data and PV loops obtained by PV loop catheter in the left ventricle before and after intervention. It will be depicted as a continuous variable in mmHg/ml as well as graphically as a slope. Changes before and after intervention will be compared as shifts in ESPVR.
Measured: Immediately following intervention
Change in left ventricular work as measured by Stroke Work
Stroke work (SW) is a continuous variable that measures the work done by the left ventricle in ejecting blood in one cardiac cycle. It is the area under one loop and is measured in mmHg.ml. SW is obtained by analysing the data and PV loops obtained by PV loop catheter in the left ventricle before and after intervention. SW before and after intervention will be compared as continuous variables using appropriate statistical tests.
Measured: Immediately following intervention
Change in left ventricular efficiency as measured by ventricular arterial coupling
VA coupling is calculated by the ratio of effective arterial elastance (Ea), a measure of afterload, to LV endsystolic elastance (Ees), a relatively load independent measure of LV chamber performance. Both these measures are expressed in mmHg/ml and as continuous variables. Normal determined Ea and Ees values in resting subjects are 2.2 ± 0.8 mmHg/ml and 2.3 ± 1.0 mmHg/ml, respectively. When Ea/Ees ratio is approximately equal to 1.0, LV and arterial system are optimally coupled to produce stroke work, a measure of the efficiency of LV work, corresponding to the product of systolic arterial pressure and stroke volume, and related to oxygen consumption. When Ea/Ees ratio is <1.0, the stroke work remains close to optimal values, but when EA/EES ratio is >1.0, the stroke work significantly falls, and the LV becomes progressively less efficient. We will compare VA coupling before and after intervention and will be analyzed as continuous variables with appropriate statistical tests.
Measured: Immediately following intervention
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted5 May 2022
- Study start4 Jun 2019
- Primary completion31 Dec 2026 (estimated)
- Study completion31 Dec 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Coarctation of AortaStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Prospective
- Enrolment
- 21 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Minnesota
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Gurumurthy Hiremath, Principal investigator, University of Minnesota
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05362721
- Sponsor's protocol ID
- PEDS-2019-27404
- Status last verified
- Apr 2026
- First submitted
- 15 Apr 2022
- Last updated
- 8 Apr 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 8 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Assessment of the Impact of Transcatheter Stenting of Aortic Coarctation on the Left Ventricular Afterload and Work Using Left Ventricular Pressure Volume Loops
- ClinicalTrials.gov ID
- NCT05362721
- Acronym / sponsor ID
- PEDS-2019-27404
- Conditions
- Coarctation of Aorta
- Keywords
- Coarctation of Aorta, COA
- Study type
- Observational
- Recruitment status
- Active, not recruiting
- Enrolment
- 21 participants (actual)
- Lead sponsor
- University of MinnesotaUniversity, hospital or other
- Study start
- 4 Jun 2019 (actual)
- Primary completion
- 31 Dec 2026 (estimated)
- Study completion
- 31 Dec 2026 (estimated)
- First posted
- 5 May 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Coarctation of the aorta accounts for 4-7% of all congenital heart disease. While stent therapy, when feasible, is the standard of care for coarctation, it may not completely improve the work (and afterload) of the heart due to its effects on the elasticity of the aorta. This study will provide the information needed to understand the effects of current management on the cardiac mechanics and work.
Study design
- Observational model
- Case only
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Pressure-volume loop catheter | – | Diagnostic Test: Pressure-volume loop catheter |
Who may qualify
- Ages
- 6 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
- Study population
- Patients referred for elective cardiac catheterization and stent therapy for coarctation
Key inclusion criteria (2 listed)
- Children 6 years of age and older and adults of all races and both sexes referred for elective cardiac catheterization and stent therapy for coarctation
- Those who provide informed consent for study participant.
Key exclusion criteria (4 listed)
- Children who undergo other interventions in addition to the coarctation
- Children with single ventricle physiology.
- Renal impairment
- Participant unwilling to sign a consent form.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Pressure-volume loop catheterThe cardiac catheterization procedure will be done according to standard protocol as part of the standard clinical care. This has become the standard of care in any patient in which it feasible and is performed with low risk. | Diagnostic test | Pressure-volume loop catheter |
Primary outcome
Change in left ventricular afterload measured by arterial elastance
Time frame: Immediately following intervention
Arterial elastance (Ea) is measured by the pressure volume (PV) loop catheter in the left ventricle. The PV loop catheter measures pressure and volume simultaneously during the entire cardiac cycle. Arterial elastance is a measure of ventricular afterload and will be calculated using previously described formula; Ea (arterial elastance): Ea = Pend systole/ SV (where P, is pressure at end systole, and SV is stroke volume). Elastance will be reported as a continuous variable in mmHg/mL with a higher number indicating an increase in elastance and a negative number indicating a decrease in elastance. Change in elastance before and after stent placement will be compared using paired T test.
3 secondary outcomes
Change in left ventricular performance measured by ESPVR
Time frame: Immediately following intervention
Change in left ventricular work as measured by Stroke Work
Time frame: Immediately following intervention
Change in left ventricular efficiency as measured by ventricular arterial coupling
Time frame: Immediately following intervention
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Apr 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Gurumurthy Hiremath principal investigator
University of Minnesota
7 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Coarctation of Aorta, run by University of Minnesota at 7 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: under way, not looking for participants, as of the sponsor's last update on 8 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 7 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in left ventricular afterload measured by arterial elastance (time frame: Immediately following intervention). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Apr 2026; AzTrials last refreshed its copy on 27 Oct 2026.