Augmentation of Limb Perfusion With Contrast Ultrasound

Not Applicable

Recruiting

• Conditions: Peripheral Arterial Disease
• Interventions: Device: Ultrasound

• Registration Number: NCT03195556
• Lead Sponsor: Oregon Health and Science University

Brief Summary

Our laboratory has discovered that ultrasound (US) imaging together with clinically approved microbubble ultrasound contrast agents can augment limb tissue perfusion. These observations have been made in mice with and without peripheral artery disease (PAD), and also in humans where high power contrast enhanced ultrasound (CEU) was used to measure perfusion but was found also to augment perfusion by almost 2-fold. The latter human studies were performed with ultrasound protocols designed for perfusion imaging and not for flow augmentation. In this study, we will measure the degree to which limb perfusion is augmented with specific therapeutic CEU settings that are still within the FDA-approved limits with regards to US power and contrast dosing.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2017-06-16
• Study First Submitted QC: 2017-06-19
• Study First Posted: 2017-06-22
• Study Start: 2018-06-18
• Status Verified: 2018-08
• Last Update Submitted: 2018-08-21
• Last Update Posted: 2018-08-23
• Primary Completion: 2019-12
• Study Completion: 2019-12

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

• Age ≥18 y.o.
• For PAD subjects: known history of unilateral or bilateral PAD diagnosed by reduced ankle-brachial index or angiography and a Rutherford symptom class of 4-6.

Exclusion Criteria

1. Major medical illness other than PAD affecting the limb (muscle disease, blood diseases that influence flow or rheology, severe heart failure [NYHA class IV or LVEF <30%]).
2. Pregnant or lactating females
3. Hypersensitivity to any ultrasound contrast agent
4. Known atrial septal defect or large right to left shunt.
5. Hemodynamic instability (hypotension with systolic BP <90 mm Hg, need for vasopressors)
6. Evidence for ongoing myocardial ischemia
7. For normal controls, any known structural non-arrhythmic cardiovascular disease (coronary artery disease, heart failure, moderate or greater valve disease).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Healthy subjects	Ultrasound	Low-power contrast ultrasound perfusion imaging and measurement of ABI and TBI will be performed before and after a 15 min high-power ultrasound cavitation therapy with intermittent ultrasound and intravenous infusion of microbubbles.
Peripheral Artery Disease	Ultrasound	Low-power contrast ultrasound perfusion imaging and measurement of ABI and TBI will be performed before and after a 15 min high-power ultrasound cavitation therapy with intermittent ultrasound and intravenous infusion of microbubbles.

Primary Outcome Measures

Name	Time	Method
Change in blood flow at 10 min	10 min post-therapeutic ultrasound cavitation.	Change in blood flow in calf skeletal muscle
Change in blood flow at 60 min	60 min post-therapeutic ultrasound cavitation	Change in blood flow in calf skeletal muscle

Trial Locations

Locations (1)

OHSU; 🇺🇸 Portland, Oregon, United States