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Biomedical subjects

J Munson

Publications and source records attributed to J Munson.

4 recordsLinked to original sources
PubMed1992

Clinical presentation of PTSD in World War II combat veterans.

Clinicians have increasingly recognized posttraumatic stress disorder (PTSD) among Vietnam veterans, but the disorder may be easily overlooked among World War II combat veterans. The authors review recent studies of PTSD in older veterans and describe five cases that illustrate the diverse clinical presentations of PTSD in this population. Symptoms included anxiety, cognitive and somatic complaints, depression, alcohol dependence, and amnestic periods. Despite the varied presentations, a fairly consistent patient profile emerged. Patients avoided reminders of war, showed an exaggerated startle response, and experienced restless sleep and chronic anxiety. Factors associated with exacerbations of symptoms were retirement and reminders of war experiences. Although past studies have emphasized resuppression of the trauma, the authors encourage a flexible approach to treatment, including exploratory techniques.

Adaptation, Psychological↗
PubMed1990

Visual artifacts in chromatically subsampled images.

Colors sampled in an array of pixels were converted into various luminance-chrominance representations, and the chrominance values were spatially subsampled to achieve a compression of the data. For viewing, the chrominance values were reinterpolated and then transformed back to RGB. For each of a range of image types and color spaces, we varied the chromatic sample spacing to determine how much compression would be possible before perceptual artifacts appeared, as determined by a panel of individual viewers. The spacing at which an image was mistaken half the time for a remembered original depended on image content and also on the color representation. Some color spaces, such as hue-lightness-saturation, a polar-coordinate color space, are inherently ill suited for chrominance averaging and produce noticeable artifacts on almost any image. Likewise, some images cannot be subsampled satisfactorily, regardless of the color space used. In general, however, images with 16-fold reduction in the amount of chrominance information (that is, a factor of 4 in each spatial direction) are still satisfactory in appearance.

Color↗
PubMed1988

Regulation of cerebral blood flow velocity in nonasphyxiated, very low birth weight infants with hyaline membrane disease.

Previous studies of cerebral blood flow (CBF) and blood flow velocity regulation in stressed neonates, both term and preterm, have suggested that CBF is pressure passive. These studies are in conflict with data obtained from fetal and newborn animals. To determine if autoregulation of CBF is present in preterm infants, we studied eight very low birth weight infants (gestational age, 29.1 +/- 1.5 weeks; birth weight, 1117 +/- 278 g), all of whom had hyaline membrane disease that necessitated mechanical ventilation. None of the infants suffered from perinatal asphyxia, intraventricular hemorrhage, or patent ductus arteriosus. All infants demonstrated appropriate changes in cerebral blood flow velocity (CBFV) in response to changes in arterial oxygen content and pCO2. CBFV was not affected by changes in systemic mean arterial blood pressure. The data indicate that nonasphyxiated very low birth weight infants regulate their CBF in a manner similar to that observed in adults.

Blood Flow Velocity↗