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Increased lung uptake during myocardial scintigraphy improves the detection and localization of coronary artery
C L Papadopoulos1, A S Doumas, G Koliakos
12nd Cardiology Dept., University of Thessaloniki, Greece.
Insights
Increased lung uptake on exercise thallium-201 scans indicates severe ventricular dysfunction. This finding is significantly associated with left anterior descending (LAD) coronary artery stenosis, suggesting a link between LAD disease and cardiac hypofunction.
Area of Science:
- Cardiology
- Nuclear Medicine
- Radiology
Background:
- Increased lung uptake during exercise thallium-201 scanning is a known indicator of severe ventricular hypofunction.
- The relationship between this finding and single coronary artery stenosis requires further investigation.
Purpose of the Study:
- To investigate the association between increased lung uptake on exercise thallium-201 scans and the presence and location of single coronary artery stenosis.
Main Methods:
- 140 patients underwent exercise thallium-201 scanning and coronary angiography.
- Lung uptake was quantified as a lung-to-heart counts ratio from planar views.
- Patients were categorized into four groups: left anterior descending (LAD), circumflex (CRX), right coronary artery (RCA) stenosis, and controls.
Main Results:
- Patients with LAD stenosis (0.53 ± 0.094) and CRX stenosis (0.44 ± 0.072) showed significantly higher lung uptake compared to controls (0.42 ± 0.050).
- No significant difference in lung uptake was observed between RCA stenosis patients and controls.
- A statistically significant difference (P < 0.001) was found between LAD stenosis and controls.
Conclusions:
- Increased lung uptake on exercise thallium-201 scans is significantly associated with left anterior descending (LAD) coronary artery stenosis.
- This finding may serve as a non-invasive marker for identifying LAD disease and associated ventricular hypofunction.
Abstract:
Increased lung uptake during exercise thallium 201 scanning denotes severe ventricular hypofunction. To assess whether there is any relationship between this finding and the stenosis of a single coronary artery, the authors studied 140 patients (age 57.5 +/- 12 years) with both exercise thallium and coronary angiography within three months. A planar view was acquired for two hundred forty seconds immediately postexercise and prior to the single photon emission computed tomography acquisition. Two identical regions of interest outlining the left ventricle and the right lung in the planar view were used for calculation of the lung uptake, expressed as a lung-to-heart counts ratio. The patients were divided into four angiographic groups: (I) lesions at the left anterior descending (LAD), n = 35; (II) stenosis at the circumflex (CRX), n = 35; (III) stenosis at the right coronary artery (RCA), n = 35; and (IV) another group of 35 normal subjects serving as controls. No patient had a previous myocardial infraction (MI) or any cardiac operation. Patients in groups I (0.53 +/- 0.094) and II (0.44 +/- 0.072) had higher lung uptake than those in groups III (0.43 +/- 0.061) or IV (0.42 +/- 0.050). There was no difference between groups III and IV, or II and IV, but the difference between I and IV was of statistical significance (P < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)