BACKGROUND Images of myocardial perfusion taken during an episode of chest pain have been used for patients in the emergency department. OBJECTIVE To evaluate the operating characteristics of 99mTc-Tetrofosmin scintigraphy during an episode of chest pain to exclude the diagnosis of acute myocardial infarction. METHODS One hundred and eight patients admitted with chest pain, or up to four ho...

Testicular scintigraphy has been well validated in the evaluation of patients with suspected testicular torsion and provides an accurate evaluation of testicular perfusion at the lime of imaging. However, the presence of normal or increased perfusion to the testis does not definitively exclude the necessity for surgical intervention. A case of intermittent testicular torsion, with a revie...

OBJECTIVES We sought to assess the variability of results obtained with thallium scintigraphy as a method for tracking the extent of myocardial ischemia in medically refractory patients with angina who are not suitable for coronary artery bypass graft surgery or percutaneous transluminal coronary angioplasty. BACKGROUND New therapies are being evaluated for patients with “no option” angina in w...

OBJECTIVE The optimization of medical exposure is one of the major issues regarding radiation protection in the world, and The International Committee of Radiological Protection and the International Atomic Energy Agency recommend establishing diagnostic reference levels (DRLs) as tools for dose optimization. Therefore, the development of DRLs based on the latest survey has been required for nu...

reversible myocardial perfusion defects during stress myocardial scintigraphy (2,3) and, even more, by the evidence of an impaired response to vasodilator stimuli of coronary blood flow and/or resistance, assessed with several different methods (4-10). In particular, a blunted increase in subendocardial flow in response to intravenous administration of adenosine (11) was shown by cardiovascular...

BACKGROUND Experimental data demonstrate the persistence of a transmural vasodilator reserve in the face of depressed resting myocardial perfusion. The present study was designed to determine whether resting myocardial hypoperfusion indicates exhausted coronary reserve (CR). METHODS AND RESULTS Fifteen patients with stable angina, isolated left anterior descending coronary artery (LAD) stenos...

Background. Experimental data demonstrate the persistence of a transmural vasodilator reserve in the face of depressed resting myocardial perfusion. The present study was designed to determine whether resting myocardial hypoperfusion indicates exhausted coronary reserve (CR). Methods and Results. Fifteen patients with stable angina, isolated left anterior descending coronary artery (LAD) stenos...

Background. Experimental data demonstrate the persistence of a transmural vasodilator reserve in the face of depressed resting myocardial perfusion. The present study was designed to determine whether resting myocardial hypoperfusion indicates exhausted coronary reserve (CR). Methods and Results. Fifteen patients with stable angina, isolated left anterior descending coronary artery (LAD) stenos...

OBJECTIVE To determine the prognostic value of myocardial perfusion scintigraphy with dipyridamole stress in patients with preexisting left bundle-branch block (LBBB) with or without chest pain. SUBJECTS AND METHODS Seventy-six patients, mean age 53 +/- 10 years, with preexisting LBBB underwent technetium-99m-sestamibi perfusion imaging with dipyridamole infusion protocol (0.56 mg/kg). Stress...

Dextrocardia is a cardiac positional anomaly in which the heart is located in the right hemithorax with its base-to-apex axis directed to the right and caudad. Situs inversus is an autosomal recessive disorder that causes organs in the chest and abdomen to be positioned in a mirror image from their normal position. Dextrocardia may occur in isolation or as part of situs inversus. Similarly, sit...