Identification of viable myocardium early after acute myocardial infarction using closed-loop arbutamine echocardiography: comparison with positron emission tomography.

Objective: This study sought to evaluate the safety and efficacy of arbutamine echocardiography in identifying contractile reserve and predicting functional improvement early after acute myocardial infarction (AMI).

Methods And Results: Seventeen patients with first AMI underwent arbutamine echocardiography 48 to 96 hours after AMI. Arbutamine was infused by a closed-loop delivery device.

The role of early measurement of nitrogen-13 ammonia uptake for predicting contractile recovery after acute myocardial infarction.

Previous studies have shown that the maintenance of cell membrane integrity and metabolism requires the persistence of residual myocardial blood flow. The purpose of this study was to assess the role of N-13 ammonia positron emission tomographic (PET) imaging performed early after an acute myocardial infarction for predicting functional recovery. Seventeen patients with an acute myocardial infarction were included in the study.

Relation between contractile reserve and positron emission tomographic patterns of perfusion and glucose utilization in chronic ischemic left ventricular dysfunction: implications for identification of myocardial viability.

Objectives: This study sought to determine the incidence and extent of dobutamine-induced contractile reserve in myocardial regions characterized by classical and new positron emission tomographic (PET) patterns in patients with chronic ischemic left ventricular dysfunction.

Background: PET is considered the most accurate method for assessment of myocardial viability, which is traditionally identified by perfusion-metabolism mismatch.

Methods: In 23 patients, segmental wall thickening expressed by four echocardiographic scores at rest and during low dose (5 and 10 microg/kg body weight per min) dobutamine infusion and regional myocardial uptake of potassium-38 and fluorine-18 fluorodeoxyglucose (F-18 FDG) during glucose clamp were compared in 16 corresponding segments.

Modeling radon progeny absorbed in glass.

The depth distribution of 214Pb and 210Pb in glass was calculated from 218Po and 214Po deposited on the surface. The activity is found in a very narrow zone near the surface (< 100 nm). A fraction of the absorbed 214Po is capable of reaching the surface by decay into 210Pb.