Clinical trial NCT03215550: PET-MRI Imaging in Patients With Symptomatic Carotid Artery Stenosis
Official title: Hybrid 18F-fluoride Positron Emission Tomography-Magnetic Resonance Imaging in Patients With Symptomatic Carotid Artery Stenosis
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Stroke
Carotid Stenosis
Keywords: atherosclerosis, imaging
Lead sponsor: University of Edinburgh
Sponsor class: OTHER
First posted: 2017-07-12
Enrollment: 20
Sex: ALL
Minimum age (years): 40
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patients with evidence of an acute stroke, transient ischaemic attack or amaurosis fugax will be recruited as early as possible, but within 14 days of symptom onset. All patients will undergo careful clinical evaluation including carotid Doppler ultrasound assessment and magnetic resonance imaging of the brain. This cohort will be identified at the point they are referred to a vascular surgeon at Edinburgh Royal Infirmary.

Brief summary: Ischaemic stroke is a major cause of death and disability worldwide. In patients with recent stroke, the 18F-fluoride positron emission tomography-computed tomography highlights high-risk culprit carotid plaque and is more discriminatory than 18F-fluorodeoxyglucose. Using hybrid positron emission tomography-magnetic resonance imaging investigators propose to build upon these findings by prospectively assessing 18F-fluoride uptake in a broad range of patients with acute transient ischaemic attack or ischaemic stroke. Investigators will specifically examine the association of 18F-fluoride uptake with multiparametric magnetic resonance imaging assessments of atherosclerotic plaque, especially the role of thrombus and lipid. Finally, using transcranial Doppler and diffusion-weighted magnetic resonance brain imaging, an assessment of the functional consequences of 18F-fluoride-positive atherosclerotic plaque will be performed. If successful, this technique has a number of valuable translational applications including the better selection of patients for carotid intervention.

Detailed description: The ability to identify the culprit carotid plaque represents a key goal in carotid artery imaging. Although an array of non-invasive imaging techniques can detect a wide spectrum of complementary high-risk characteristics, no single modality can reliably identify vulnerable plaques associated with future stroke development. Substantial histological data suggests that specific plaque components identify patients at high-risk for future ipsilateral stroke and cardiovascular events. This implies that investigators need to look beyond the traditional paradigm where the basis for carotid endarterectomy were formulated by an invasive imaging modality that provided no information on the arterial wall composition. Alternative imaging strategies are therefore required targeting not only in vivo carotid morphology but also plaque biology and disease activity. This is fundamental to optimal risk-stratification and appropriate selection of patients for high-risk vascular intervention. One new approach is to use non-invasive molecular imaging targeted at plaque biology using hybrid systems such as positron emission tomography-magnetic resonance imaging.

Eligibility criteria: Inclusion Criteria:

• Patients with carotid artery stenosis (\>50% for men and \>70% for women, by NASCET criteria) above 40 years of age.

Exclusion Criteria:

* Patients with new stroke and a modified Rankin score \>3
* Chronic kidney disease with an estimated Glomerular Filtration Rate (eGFR) of \<30 ml/min/1.73 m2
* Atrial fibrillation
* Pregnant women
* Prior ipsilateral carotid intervention
* Prior neck radiotherapy
* Inability to tolerate the supine position
* Participation in the study would result in delay to surgery
* Psychiatric illness/social situations that would limit compliance with study requirements
* History of allergic reaction attributed to 18F-fluoride
* History of allergic reaction to gadolinium contrast media
* Metal implants and devices including pacemakers and defibrillators

Primary outcomes:
measure: 18F-fluoride uptake in the culprit plaque in carotid, aortic and intra-cranial vessels.
timeFrame: 2 weeks
Secondary outcomes:
Other outcomes:
Locations:
city: Edinburgh
country: United Kingdom
facility: Centre for Cardiovascular Science
Study officials:
References:
citation: Kaczynski J, Sellers S, Seidman MA, Syed M, Dennis M, Mcnaught G, Jansen M, Semple SI, Alcaide-Corral C, Tavares AAS, MacGillivray T, Debono S, Forsythe R, Tambyraja A, Slomka PJ, Leipsic J, Dweck MR, Whiteley W, Wardlaw J, van Beek EJR, Newby DE, Williams MC. 18F-NaF PET/MRI for Detection of Carotid Atheroma in Acute Neurovascular Syndrome. Radiology. 2022 Oct;305(1):137-148. doi: 10.1148/radiol.212283. Epub 2022 Jun 7.