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Nineteen lightly sleep-deprived healthy volunteers were examined with H2(15)O and positron emission tomography (PET). Scanning was performed during wakefulness and after the subjects had fallen asleep. Sleep stage was graded retrospectively from electroencephalogram (EEG) recordings, and scans were divided into two groups: wakefulness or synchronized sleep.(More)
The objective of this study was to assess whether reduced glucose metabolism (rCMRGlu) and cognitive functioning could predict development of Alzheimer's disease (AD) in subjects with mild cognitive impairment (MCI). Twenty MCI patients underwent baseline and follow-up investigations of rCMRGlu, as measured by PET, and cognitive function measured by(More)
BACKGROUND & AIMS Brain loci that process human esophageal sensation remain unidentified. The aim of this study was to identify the brain loci that process nonpainful and painful human esophageal sensation. METHODS In 8 healthy subjects (7 men; age range, 24-47 years), distal esophageal stimulation was performed by repeatedly inflating a balloon at(More)
Intracerebral microdialysis (MD) was applied in patients with subarachnoid hemorrhage. The regional CBF, the CMRO2, and oxygen extraction ratio (OER) were measured with simultaneous positron emission tomography (PET). The aim was to directly correlate alterations in dialysate levels of energy-related metabolites (lactate, lactate/pyruvate ratio,(More)
BACKGROUND Recent findings of a reduced cerebral metabolic rate of glucose (CMRGlu) in at-risk relatives of patients with Alzheimer disease (AD) who carry the apolipoprotein E (APOE) epsilon 4 allele suggest a causative role for the E4 isoform in cognitive changes that lead to AD. It is not known whether epsilon 4 allele-associated deficits exist in(More)
BACKGROUND Reduced lung function has been associated with increased rates of myocardial infarction. Whether the occurrence and prognostic significance of ventricular arrhythmia is related to lung function is largely unknown. METHODS AND RESULTS We performed a population-based study of 68-year-old men without a history of stroke or myocardial infarction;(More)
UNLABELLED Combining MRI morphological data with functional PET data offers significant advantages in research as well as in many clinical situations. Automatic methods are needed, however, to coregister the data from the two modalities. METHODS Simulated PET images were created by simple and automatic segmentation of MR images followed by the assignment(More)
BACKGROUND Prolonged coma is not an uncommon clinical problem following resuscitation from cardiac arrest. Early and precise prediction of outcome is highly desirable for ethical and economical reasons. The aims of this study were to use positron emission tomography (PET) to investigate the regional dynamic changes of cerebral blood flow and metabolism(More)
Regional lung hematocrit ratio (R) was measured in five normal subjects and five patients (2 with pneumonia, 2 with nephrotic syndrome with anemia, and 1 with pancreatitis) using positron emission tomography, a red cell marker 11CO, and a plasma marker [methyl-11C]albumin). The measurements were made in a transaxial thoracic section at midheart level with(More)