Detection of Hypoxia in Human Thoracic Aorta Using Pimonidazole Hydrochloride

NCT ID: NCT03410420

Last Updated: 2026-01-23

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE1
• Total Enrollment: 9 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2018-09-01
• Study Completion Date: 2025-09-01

Brief Summary

This is a prospective study designed to determine the safety and value of Hypoxyprobe-1 (pimonidazole hydrochloride (-HCl)) to detect levels of tissue hypoxia in patients presenting with ascending aortic aneurysm.

Detailed Description

The proposed study is designed to identify the level of tissue hypoxia in patients presenting with ascending aortic aneurysm. Ascending aortic aneurysms affect approximately 15,000 people in the United States each year, and represent a serious clinical problem because there is a known, but unspecified risk of aortic rupture or dissection. Despite progress made in the surgical management of ascending aortic aneurysms, the molecular and cellular mechanisms involved remain elusive. However, indirect evidence of tissue hypoxia have recently been described in the literature.

This pilot study will use pimonidazole-HCl, a compound that is retained by hypoxic cells and that has been used for detection of tissue hypoxia in human since the early 2000s. This pilot study will involve twenty patients who are candidates for aortic replacement due to aneurysm and twenty non-aneurysmal patients undergoing coronary artery bypass graft (controls). Patients will be administered pimonidazole-HCl orally in a single dose (0.5g/m2) 24 hours prior to scheduled surgical time. During surgery, the resected aneurysmal aortic specimens (for patients undergoing aortic replacement) or aortic punch (for patients undergoing coronary artery bypass graft) will be harvested. Tissue hypoxia will be qualitatively and quantitatively assessed in the investigator's research laboratory. Based on previous toxicological animal studies and previous use in human studies, the anticipated risk of severe or serious side effect will be relatively minimal.

Conditions

Aortic Aneurysm, Thoracic

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: NONE

Study Groups

Non aneurysmal

Intervention: four non-aneurysmal patients undergoing coronary artery bypass graft or aortic valve replacement will be administered pimonidazole-HCl orally in a single dose (0.5g/m2) 24 hours prior to scheduled surgical time.

Group Type: ACTIVE_COMPARATOR

Pimonidazole hydrochloride

Intervention Type: DRUG

administration of pimonidazole-HCl

Aneurysmal

Intervention: four patients who are candidates for aortic replacement due to aneurysm will be administered pimonidazole-HCl orally in a single dose (0.5g/m2) 24 hours prior to scheduled surgical time.

Group Type: EXPERIMENTAL

Pimonidazole hydrochloride

Intervention Type: DRUG

administration of pimonidazole-HCl

Interventions

Pimonidazole hydrochloride

administration of pimonidazole-HCl

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

1. Adults ≥ 18 years of age who require one of the following open surgery:

• Ascending thoracic aorta repair due to aneurysm;
• Aortic valve replacement due to aortic valve insufficiency;

2. Adequate hematologic functions:

• White blood cells > 2500/µ;
• Platelets > 100,000/µL;
• Hemoglobin > 8 g/dl.

3. Adequate renal functions: serum creatinine < 2.0 mg/dl.

4. Adequate hepatic function: serum alkaline phosphatase, bilirubin, and serum glutamate oxaloacetate transaminase twice normal levels.

5. If the subject or partner is of childbearing potential, he or she must be willing to use adequate contraception (hormonal or barrier method or abstinence) from the time of screening and for a period of at least 16 weeks after procedure.

6. Capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the consent form, release of medical information, and Health Insurance Portability and Accountability Act (HIPAA) documentation.

7. Female subjects of childbearing potential must have a negative serum pregnancy test at screening. human chorionic gonadotropin levels will be assessed for all women of childbearing years prior to the procedure.

Exclusion Criteria

1. Severe septicemia or severe infection in the 4 weeks prior to study entry;

2. The subject has a baseline NIHSS > 1 or modified Rankin Scale > 1.

3. Active participation in other research therapy for cardiovascular repair/regeneration;

4. Pregnant or breastfeeding at time of screening;

5. Cardiothoracic surgery within 30 days prior to screening;

6. The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 100 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Thomas Gleason

OTHER

Sponsor Role: lead

Responsible Party

Thomas Gleason

Professor

Responsibility Role: SPONSOR_INVESTIGATOR

Principal Investigators

Thomas G Gleason, MD

Role: PRINCIPAL_INVESTIGATOR

University of Pittsburgh

Locations

University of Pittsburgh

Pittsburgh, Pennsylvania, United States

Countries

United States

Other Identifiers

STUDY19090250

Identifier Type: -

Identifier Source: org_study_id