Atherosclerotic Coronary Vulnerable Plaque: Correlation With Coronary Artery Calcium

A total of 60 patients, from a single center, who meet all of the study inclusion criteria
and none of the study exclusion criteria will be prospectively enrolled in this study.
Qualifying patients will be referred to the study site for clinically indicated, non-emergent
cardiac catheterization with NIRS evaluation, either proceeded or followed by coronary artery
calcium score (CACS) evaluation.

Qualifying patients that are referred directly to cardiac catheterization with NIRS
assessment secondary to symptoms or abnormal functional test will be sent for cardiac CACS
assessment following the catheterization before discharge from the hospital. In this group,
patients who require ad hoc PCI upon initial angiography will be excluded to avoid artifacts
on CACS. In patients who are referred for a clinically indicated cardiac catheterization with
IVUS evaluation within 3 months after MDCT with CACS, NIRS of at least two (2) major
epicardial vessels will be completed prior to any (if necessary) coronary revascularization.

Inclusion Criteria:

- Patient is ≥18 years of age

- Patient is clinically indicated due to angina, abnormal functional test or other
ischemic symptoms to undergo non-emergent cardiac catheterization with IVUS evaluation
i.If the patient has not had a cardiac MDCT with CACS meeting the protocol
requirements within 3 months prior to the cardiac catheterization, the patient is able
to undergo CACS following LipiScan IVUS and NIRS evaluation, prior to any coronary
revascularization ii. If the patient has had a cardiac MDCT evaluation with CACS
meeting the protocol requirements within 3 months prior to the cardiac
catheterization, LipiScan IVUS and NIRS imaging will be completed in at least two (2)
major epicardial vessels prior to any coronary revascularization

- At least two (2) major epicardial native vessels are suitable for interrogation by
LipiScan IVUS imaging and NIRS evaluation, defined as:

i.At least 30 mm of vessel that is > 2.0mm in diameter ii.No other contraindications
to imaging

- No contraindications for LipiScan IVUS and NIRS evaluation

- No contraindications for CACS evaluation by MDCT

- Subject must be able to provide informed consent form and comply with the protocol
requirements

Exclusion Criteria:

- Evidence of clinical hemodynamic instability in the 6 hours before either procedure

- Prior history of percutaneous coronary intervention (PCI) with stent placement

- Prior history of bypass grafts

- Female subject that is pregnant or lactating

- Any other factor that the investigator feels would put the patient at increased risk
or otherwise make the patient unsuitable for participation in the protocol