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You are being asked to participate in this research study because your doctor has ordered a myocardial perfusion SPECT (Single-Photon Emission Computed Tomography) scan to look at the blood flow in your heart.
Myocardial perfusion imaging is a proven test that looks at the blood flow to your heart after the injection of a radioactive tracer. The standard test requires two injections of the radioactive tracer and takes images of your heart at rest and after a stress test. It has been proposed that in some cases, patients could have images done only after the stress portion of the test and, if normal, the rest images would not need to be done. In this case, only one injection of the radioactive tracer would be needed. It has further been proposed that adding another stress image made with you lying on your stomach, will increase the confidence of the reporting doctor in reporting stress images.
The purpose of this study is to find out if the extra information added from the image with you on your stomach helps the doctor when reporting the test results.
Successfully implementing a SFSO-MPI protocol requires a validated pre-screening tool and a proven imaging protocol that aids the physician in reporting the study with confidence. Our previous study, entitled "The feasibility of Stress-First/Stress-Only Myocardial Perfusion Imaging to reduce patient radiation exposure in a selected subset of patients undergoing testing in a tertiary care facility (SFSO-MPI)", was designed to validate a pre-screening tool developed by Duvall et al. In our population the tool demonstrated sensitivity and specificity (95% CI) of 0.79 (0.74-0.83) and 0.55 (0.48-0.62) (unpublished data). The sensitivity was lower than previous published. However we noted that a greater proportion of patients were classified as abnormal (55% vs 31 and 36% in the two cohorts described by Duvall et al) and a high number of patients (15%) were reported as having equivocal stress images. These factors may have affected the sensitivity of the pre-screening tool. A greater proportion of our patients would then have required a rest study for proper interpretation of the test. Additional imaging increases the patients' radiation exposure and time requirement for their study and affects the proper allocation of department resources.
The department routinely images patients in only the supine position. The implementation of routine combined supine/prone imaging is expected to decrease image artifacts which may reduce the number of studies reported as equivocal. If combined supine/prone imaging is successful in changing the interpretation of a significant proportion of equivocal stress studies to normal, then the need for rest imaging will be obviated in a larger group of patients, resulting in reduced radiation dose to patients and medical staff, better laboratory efficiency due to faster throughput, reduced time commitment for patients and lower radiopharmaceutical cost. This change to practice will also further aid meeting the ASNC goal of no more than 9mSv patient exposure in 50% of studies.
Intervention Model: Single Group Assignment, Masking: Single Blind (Investigator), Primary Purpose: Diagnostic
Radiation Reduction in Myocardial Perfusion Imaging
Hamilton Health Sciences - Hamilton General Site
Hamilton Health Sciences Corporation
Published on BioPortfolio: 2015-10-16T12:23:21-0400
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