Coronary Computed Tomographic Angiography in Emergency Department Chest Pain Patients at Intermediate Risk of Acute Coronary Syndrome (CCTA)

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: NCT00473863
Recruitment Status : Unknown
Verified November 2007 by Vancouver General Hospital.
Recruitment status was:  Recruiting
First Posted : May 16, 2007
Last Update Posted : November 20, 2007
University of British Columbia
Information provided by:
Vancouver General Hospital

Brief Summary:
The purpose of this study is to determine whether Coronary Computed Tomographic Angiography (CCTA) will increase patient safety by decreasing the rate of missed ACS and adverse events in patients who receive standard care plus CCTA versus standard care alone. Additional goals of the study are to determine whether CCTA can safely reduce the duration of ED visits and the number and duration of hospital admissions.

Condition or disease Intervention/treatment Phase
Acute Coronary Syndrome Acute Myocardial Infarction Unstable Angina Coronary Disease Coronary Stenosis Procedure: Coronary Computed Tomographic Angiography Phase 3

Detailed Description:


Acute coronary syndrome (ACS) is the clinical manifestation of acute myocardial ischemia induced by coronary artery disease (CAD). Although most patients presenting with chest pain to the Emergency Department (ED) can be stratified into "high risk" or "low risk" chest pain algorithms, patients at "intermediate risk" are more difficult to manage. This translates into lengthy waits in the ED and repetitive investigations while 5.3% of cases of ACS are still missed and too many patients are admitted to the CCU (false positive rate of 14%). CCTA is a novel, non-invasive method for evaluating coronary artery stenosis and occlusion.

The ability to accurately diagnose or exclude ACS in patients in a rapid, non-invasive fashion has been previously lacking. If CCTA is shown to be clinically useful in risk stratification of this patient population, there is great potential for increasing patient safety, reducing ED admission times and decreasing the number and duration of CCU admission.


ED admission and discharge times, CCU consult and decision times and duration of CCU admission, cardiac risk factors, vital signs, laboratory results, ED disposition plan, CCTA results, coronary calcium score, index hospitalization diagnosis, investigations, revascularization rates as well as 30-day diagnosis, death, adverse event rate and subsequent investigations.

Research Method:

The study population will consist of ED chest pain patients at intermediate risk of ACS. Informed consent will be obtained for both CCTA and the 30-day follow up. Patients will be randomized into one of two diagnostic arms: standard care plus CCTA versus standard care alone. If the patient receives CCTA, the test will be interpreted by a blinded radiologist and the results provided to the ED physician and entered into the patient chart. A research nurse will collect workflow and clinical data for all enrolled patients.

Two reviewers, an ED physician and a cardiologist, blinded to the CCTA results, will independently review the index and 30 day clinical data. One of the following will be assigned: acute myocardial infarction, definite unstable angina, possible unstable angina, or no acute coronary syndrome. Alternate non-ACS diagnoses will be ascertained when applicable.

Statistical Analysis This proposal represents a pilot study to demonstrate the feasibility of identifying and recruiting patients to the trial, demonstrate the feasibility of collecting follow-up data, and provide preliminary estimates of outcome measures to help determine the sample size required for a definitive study. All analyses will be descriptive. Recruitment, crossover, follow-up, and completion rates will be determined. Estimates of diagnostic accuracy and length of stay in the ED will be determined and will be used to inform the design of the definitive study.

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 150 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Diagnostic
Official Title: Coronary Computed Tomographic Angiography in Emergency Department Chest Pain Patients at Intermediate Risk of Acute Coronary Syndrome
Study Start Date : November 2007
Estimated Study Completion Date : July 2008

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Chest Pain

Arm Intervention/treatment
Experimental: intervention
Receives CCTA
Procedure: Coronary Computed Tomographic Angiography
CCTA will be performed

No Intervention: Control

Primary Outcome Measures :
  1. Emergency Department Admission Time [ Time Frame: During initial presentation to hospital ]

Secondary Outcome Measures :
  1. CCU consult time [ Time Frame: During initial presentation to hospital ]
  2. CCU decision time [ Time Frame: During initial presentation to hospital ]
  3. Duration of CCU admission [ Time Frame: During initial presentation to hospital ]
  4. Adverse event rate [ Time Frame: 30 days post ED visit ]
  5. All-cause mortality [ Time Frame: 30 days post-ED visit ]

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.

Ages Eligible for Study:   19 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion criteria (all of the following):

  • Anterior or lateral chest pain
  • 19 years of age or older
  • Fixed address in British Columbia
  • Available for telephone follow-up

Exclusion criteria (any of the following).

  • Low Risk for ACS (all of the following):
  • Age < 40 years with normal ECG (T wave flattening is the only acceptable abnormality)
  • No prior history of ischemic chest pain (defined as a past diagnosis of MI or angina, previously prescribed nitroglycerine or a clear history of effort related angina)
  • High Risk for ACS (any of the following):
  • Diagnosis consistent with ST elevation myocardial infarction
  • New ST depression ≥ 0.05 mV
  • Troponin > 0.1
  • Patients with Killip class III or IV heart failure.
  • Hemodynamic instability
  • Previous enrolment in this study.
  • Presence of terminal noncardiac illness.
  • History of angioplasty with stenting and/or grafts.
  • Presence of atrial fibrillation.
  • Contraindication to administration of iodinated contrast agent.
  • Contraindication to beta-blocker administration (eg, asthmatics) AND calcium channel blocker administration.
  • Glomerular filtration rate less than 60 mL/min.
  • Previous ECG-gated CT with calcium score >1000 Agatston Units.
  • Pregnancy.
  • Patients with communication difficulties.
  • Patients who have a clear alternative diagnosis other than ischemic chest pain (e.g. traumatic chest pain or pneumonia).

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): NCT00473863

Contact: William F Dick, MD 604 875 4700

Canada, British Columbia
VGH Recruiting
Vancouver, British Columbia, Canada, V5Z1M9
Contact: William Dick, MD    604 875 4700   
Sub-Investigator: James KH Woo, MD BSc         
Sub-Investigator: Savvas Nicolaou, MD         
Sub-Investigator: Doug McKnight, MD         
Sub-Investigator: John Mayo, MD         
Sponsors and Collaborators
Vancouver General Hospital
University of British Columbia
Principal Investigator: William F Dick, MD Vancouver General Hospital
Study Director: John Mayo, MD Vancouver General Hospital Identifier: NCT00473863     History of Changes
Other Study ID Numbers: H07-00742
First Posted: May 16, 2007    Key Record Dates
Last Update Posted: November 20, 2007
Last Verified: November 2007

Keywords provided by Vancouver General Hospital:
Acute coronary syndrome
Acute myocardial infarction
Unstable angina
Coronary computed tomographic angiography
Coronary Angiography
Tomography, X-Ray Computed
Tomography, Spiral Computed

Additional relevant MeSH terms:
Acute Coronary Syndrome
Myocardial Infarction
Coronary Disease
Coronary Artery Disease
Chest Pain
Angina, Unstable
Coronary Stenosis
Pathologic Processes
Myocardial Ischemia
Heart Diseases
Cardiovascular Diseases
Vascular Diseases
Disease Attributes
Arterial Occlusive Diseases
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Angina Pectoris