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Metabolic Cardiac Imaging in Severe Coronary Disease: Assessment of Viability with Iodine-123-Iodophenylpentadecanoic Acid and Multicrystal Gamma Camera, and Correlation with Biopsy

Cardiovascular Institute of the South, Houma, Louisiana
Institute of Radiological and Imaging Sciences, University of Siena, Italy
Health Services Research and Nuclear Medicine Department, Baptist Memorial Hospital, Memphis, Tennessee
Terrebonne General Medical Center, Houma, Louisiana

Correspondence: For reprints contact: Gary L. Murray, MD, Suite 210, 5220 Park Ave., Memphis, TN 38119.

ABSTRACT

Fifteen patients with coronary disease and resting left ventricular ejection fractions of 0.35 underwent resting metabolic cardiac imaging utilizing 1 mCi [¹²³I]iodophenylpentadecanoic acid (IPPA) intravenously and a multicrystal gamma camera. Parametric images of regional rates of IPPA clearance and accumulation were generated. Forty-two vascular territories (22 infarcted) were evaluated by metabolic imaging as well as transmural myocardial biopsy. Despite resting akinesis or dyskinesis in 20/22 (91%) infarcted territories, 16/22 (73%) of these territories were metabolically viable. Transmural myocardial biopsies in all patients (43 sites, 42 vascular territories) during coronary bypass surgery confirmed IPPA results in 39/43 patients (91%). When compared to biopsy, scan sensitivity for viability was 33/36 (92%) with a specificity of 6/7 (86%). Eighty percent of bypassed, infarcted but IPPA viable segments demonstrated improved regional systolic wall motion postoperatively as assessed by exercise radionuclide angiography. We conclude resting IPPA imaging identifies viable myocardium, thereby providing a safe, cost-effective technique for myocardial viability assessment.

This article has been cited by other articles:

				G. L. Murray, N. Schad, A. J. Bush, and G. L. Murray Viability After Myocardial Infarction: Can It Be Assessed Within Five Minutes by Low-Dose Dynamic Iodine-123-Iodophenylpentadecanoic Acid Imaging with a Multicrystal Gamma Camera? Angiology, April 1, 1997; 48(4): 309 - 319. [Abstract] [PDF]