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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT00990262
Other study ID # 2003P000458
Secondary ID R01HL080053-01
Status Completed
Phase N/A
First received September 30, 2009
Last updated October 2, 2009
Start date May 2005
Est. completion date April 2009

Study information

Verified date October 2009
Source Massachusetts General Hospital
Contact n/a
Is FDA regulated No
Health authority United States: Institutional Review Board
Study type Observational

Clinical Trial Summary

The goal of this research is to determine noninvasively whether detection of coronary stenosis and plaque by multidetector computed tomography (MDCT) in patients with acute chest pain suspected of acute coronary syndrome (ACS) enhances triage, reduces cost and is cost effective. Among the 5.6 million patients with ACP presenting annually in emergency departments (ED) in the United States, a subgroup of two million patients is hospitalized despite normal initial cardiac biomarker tests and electrocardiogram (ECG). This subgroup is at low (20%) risk for ACS during the index hospitalization. Most (80-94%) patients with a diagnosis of ACS have a significant epicardial coronary artery stenosis ( >50% luminal narrowing). However, in -10% of patients non-stenotic coronary plaque triggers events, i.e. vasospasms, leading to myocardial ischemia. Since the absence of plaque excludes a coronary cause of chest pain, these patients could in theory be discharged earlier reducing unnecessary hospital admissions. Recent publications demonstrate high sensitivity and specificity of MDCT for the detection of significant coronary stenosis compared with coronary angiography and the detection of coronary plaque as validated with intravascular ultrasound. Using 64- slice MDCT we propose to study 400 patients with ACP, negative initial cardiac biomarkers and non-diagnostic ECG. We will analyze MDCT images for the presence of significant coronary artery stenosis and plaque and correlate the data with the clinical diagnosis of ACS (AHA guidelines) during the index hospitalization to determine the sensitivity and specificity. MDCT data, risk factors, and the results of standard diagnostic tests available at the time of MDCT will be used to generate a multivariate prediction function and derive a clinical decision rule. Based on this decision rule we will compare the diagnostic accuracies and cost effectiveness of competing strategies. We hypothesize that an MDCT- based diagnostic strategy will reduce the time to diagnosis of ACS, number of hospitalizations, and absolute cost of management of patients with acute chest pain compared to standard clinical care and is cost effective.


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Study Design

Observational Model: Cohort, Time Perspective: Prospective


Intervention

Radiation:
Cardiac Computed Tomography
Localization of the heart position in a projectional topographic scan of the chest. Determination of contrast agent transit time: 10 ml contrast agent. CT coronary angiography: CT scan in spiral acquisition mode with 330 ms rotation time, 32 x 0.6 mm collimation, a pitch of 2.8 mm/rotation, tube voltage of 120 kVp, and maximum tube current of 850 mA. 80 ml of contrast agent, followed by 40 ml saline solution will be injected at a rate of 4 ml/s. The mean breath hold duration for this acquisition is approximately 13 seconds.

Locations

Country Name City State
United States Massachusetts General Hospital Boston Massachusetts

Sponsors (1)

Lead Sponsor Collaborator
Massachusetts General Hospital

Country where clinical trial is conducted

United States, 

References & Publications (7)

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Outcome

Type Measure Description Time frame Safety issue
Primary Accuracy of CT derived features of coronary artery disease and LV function for ACS ED presentation to hospital discharge Yes
Secondary Major adverse cardiac events (MACE) - defined as death, myocardial infarction or coronary revascularization Follow up at 6 months and 2 year after index hospitalization Yes
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