Strain rate imaging differentiates transmural from non-transmural myocardial infarction: a validation study using delayed-enhancement magnetic resonance imaging.

Objectives: The aim of this study was to determine if strain rate imaging (SRI) correlates with the transmural extent of myocardial infarction (MI) measured by contrast-enhanced magnetic resonance imaging (Ce-MRI).

Background: Identification of the transmural extent of myocardial necrosis and degree of non-viability after acute MI is clinically important.

Methods: Tissue Doppler echocardiography with SRI and Ce-MRI were performed in 47 consecutive patients with a first acute MI between days 2 and 6 and compared to 60 age-matched healthy volunteers.

Left ventricular systolic asynchrony after acute myocardial infarction in patients with narrow QRS complexes.

Background: The aim of the study was to assess the degree of left ventricular (LV) asynchrony after myocardial infarction (MI) in patients with a narrow QRS complex using tissue Doppler imaging (TDI) and correlate this with the site and extent of the infarction measured by contrast-enhanced magnetic resonance imaging (Ce-MRI).

Methods: Echocardiography with TDI and Ce-MRI was performed within 6 days of acute MI in 47 patients and compared with 69 age-matched healthy volunteers. Regional myocardial velocities were assessed in 12 segments, and the corresponding systolic velocity (Sm), early diastolic velocity (Em), as well as the time to peak Sm (Ts) and time to peak Em (Te) were measured.

Assessment of hyperacute stroke like symptoms by diffusion-weighted images.

We assessed the role of diffusion-weighted images in the evaluation of hyperacute stroke like symptoms in 18 patients. The volume of infarct measured by diffusion-weighted imaging (DWI) was correlated with the later computed tomography (CT) examinations. DWI had a sensitivity of 92%, specificity of 100%, positive predictive value of 100%, and negative predictive value of 86% in detection of acute hemorrhagic and ischemic stroke.

Screening of colonic tumors by air-inflated magnetic resonance (MR) colonography.

Purpose: To assess the accuracy of air-inflated magnetic resonance (MR) colonography for the detection of colonic lesions.

Materials And Methods: A total of 36 patients underwent both colonoscopy and air-inflated MR colonography. Breath-hold sequences (volumetric interpolated breath-hold examination (VIBE) coronal, and half-Fourier acquisition single-shot turbo spin-echo (HASTE) axial and coronal, both supine and prone) were performed with a 1.

Magnetic resonance colonography in the detection of colonic neoplasm in high-risk and average-risk individuals.

Objectives: Magnetic resonance colonography (MRC) is a new noninvasive diagnostic modality for colorectal cancer. However, the use of MRC in the detection of colorectal neoplasm in average-risk individuals remains unknown. This study determined the performance and the patient's preference of MRC in the detection of colorectal neoplasm.

Combined first-pass perfusion and viability study at MR imaging in patients with non-ST segment-elevation acute coronary syndromes: feasibility study.

Purpose: To assess the feasibility of combined perfusion and viability testing by using magnetic resonance (MR) imaging in one setting in patients with non-ST segment-elevation acute coronary syndromes.

Materials And Methods: The data of 13 patients (mean age, 68 years; range, 40-85 years) at high risk for myocardial infarction who underwent MR imaging at 1.5 T were reviewed.

Metabolic control patterns in acute phase and regenerating human liver determined in vivo by 31-phosphorus magnetic resonance spectroscopy.

Objective: To elucidate the metabolic changes occurring within hepatocytes during acute phase reaction and liver regeneration.

Summary Background Data: The metabolic events occurring within the liver during the hepatic stress response are poorly understood. The authors used in vivo 31-phosphorus magnetic resonance spectroscopy to study hepatic metabolism after surgical trauma with and without loss of liver cell mass.