COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Comparing Angiography: Multislice CT Versus Invasive Heart Catheterization (CACTI)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00284466
Recruitment Status : Completed
First Posted : January 31, 2006
Last Update Posted : August 29, 2012
Information provided by (Responsible Party):
University of Wisconsin, Madison

Brief Summary:
The purpose of the study is to compare the pictures of heart arteries obtained by MSCT scanner to the pictures obtained during heart catheterization. Our specific question is whether the MSCT scanner is accurate enough to replace heart catheterization in some situations for the evaluation of coronary heart disease.

Condition or disease Intervention/treatment Phase
Coronary Arteriosclerosis Procedure: MS-CT Coronary Angiography Not Applicable

Detailed Description:

QUESTION: Compare the accuracy of multi-slice CT angiography (CTA) with invasive catheterization (Cath) in detecting and grading coronary lesions.

EXPERIMENTAL DESIGN: A prospective cohort analysis comparing the quantification of coronary atherosclerosis by Computed Tomographic angiography to that of invasive Catheterization. Subjects will be patients who are scheduled for non-urgent cardiac cath based on a clinical need to evaluate the coronary anatomy. Cath may be scheduled after a positive stress test or on the basis of concerning symptoms. If a patient consents to participation they will be scheduled for CTA no less than 3 and no more than 30 days prior to Cath. Comparison of lesions detected by the two imaging modalities in the proximal, mid and distal coronary arteries will be made. Grades of disease used will be the following 1). less than 50% 2). 50-75% 3). greater than 75% 4) Uninterpretable. Sensitivity and specificity will be calculated for CTA; in addition PPV and NPV will also be calculated. The 2 readers of the CTA will be blinded to the invasive angiography results. The 2 readers of the invasive angiography, who are blinded to the CTA results will be the standard of comparison. Analysis of data will be performed on a segmental, vessel, and patient basis.

POTENTIAL RISK: Risks associated with contrast exposure include the risk of allergic reaction and renal injury. There is a small risk of excessive bradycardia and hypotension with administration of metoprolol and nitroglycerine. CTA is associated with radiation exposure similar to the lower range of diagnostic catheterization.

POTENTIAL BENEFITS: No direct benefits are expected for the subjects of this study as the information will not be used to alter clinical decisions. Benefits to future patients may include the development of an non-invasive alternative to cardiac catheterization.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 50 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Comparing Angiography: Multislice CT vs. Invasive Heart Catheterization (CACTI)
Study Start Date : January 2006
Actual Primary Completion Date : August 2006
Actual Study Completion Date : August 2006

Resource links provided by the National Library of Medicine

Intervention Details:
  • Procedure: MS-CT Coronary Angiography
    MS-CT Coronary Angiography done

Primary Outcome Measures :
  1. The primary endpoint of the study is the ability of CTA to detect coronary disease of greater than 50% diameter stenosis (sensitivity, specificity, positive and negative predictive value) analyzed on a subject basis. [ Time Frame: assess at time of CTA ]

Secondary Outcome Measures :
  1. Assess CTA performance on both a vessel and coronary segment basis [ Time Frame: assessed at time of CTA ]
  2. Estimate the impact of coronary calcium score on ability to assess for coronary disease [ Time Frame: assessed at time of CTA ]
  3. Evaluate impact of scan quality of CTA performance measures [ Time Frame: assessed at time of CTA ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Subjects >18 years old with stable clinical symptoms who are scheduled for outpatient cardiac catheterization.
  2. Able to provide written informed consent in accordance with the IRB.

Exclusion Criteria:

  1. Symptoms of unstable angina/acute coronary syndrome
  2. Known allergy or adverse reaction to CT radiocontrast and/or iodine.
  3. Known absolute contraindication to Metoprolol.
  4. Significant kidney disease including creatinine > 1.5 mg/dL or GFR < 60 ml/min.
  5. Inability to breath-hold for up to 30 seconds.
  6. Women who are Pregnant or Nursing
  7. Atrial Fibrillation or any other arrhythmia that makes attaining a regular slow rhythm unlikely.
  8. History of previous stent placement or coronary bypass surgery.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00284466

Layout table for location information
United States, Wisconsin
University of Wisconsin
Madison, Wisconsin, United States, 53792
Sponsors and Collaborators
University of Wisconsin, Madison
Layout table for investigator information
Principal Investigator: Jon G Keevil, MD University of Wisconsin, Madison
Layout table for additonal information
Responsible Party: University of Wisconsin, Madison Identifier: NCT00284466    
Other Study ID Numbers: HS-IRB 2005-0377
First Posted: January 31, 2006    Key Record Dates
Last Update Posted: August 29, 2012
Last Verified: August 2012
Keywords provided by University of Wisconsin, Madison:
coronary artery disease
cardiac catheterization
CT coronary angiography
coronary angiography
Additional relevant MeSH terms:
Layout table for MeSH terms
Coronary Artery Disease
Myocardial Ischemia
Arterial Occlusive Diseases
Vascular Diseases
Cardiovascular Diseases
Coronary Disease
Heart Diseases