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Biomedical subjects

J Dysart

Publications and source records attributed to J Dysart.

12 recordsLinked to original sources
PubMed2003

Treatment of coexistent coarctation and aneurysm of the aorta with covered stent in a pediatric patient.

Intravascular stents have emerged as an effective alternative to surgery and balloon angioplasty in the treatment of native and recoarctation of aorta. Balloon angioplasty, although effective in the treatment of native coarctation of the aorta, is associated with several complications such as recoarctation, aneurysm formation, aortic dissection, and vascular injury. In this report, we present the use of a covered stent to treat a patient who developed recoarctation of the aorta with an associated aneurysm following balloon angioplasty of her native coarctation.

Adolescent↗
PubMed2001

Eyewitness accuracy rates in sequential and simultaneous lineup presentations: a meta-analytic comparison.

Most police lineups use a simultaneous presentation technique in which eyewitnesses view all lineup members at the same time. Lindsay and Wells (R. C. L. Lindsay & G. L. Wells, 1985) devised an alternative procedure, the sequential lineup, in which witnesses view one lineup member at a time and decide whether or not that person is the perpetrator prior to viewing the next lineup member. The present work uses the technique of meta-analysis to compare the accuracy rates of these presentation styles. Twenty-three papers were located (9 published and 14 unpublished), providing 30 tests of the hypothesis and including 4,145 participants. Results showed that identification of perpetrators from target-present lineups occurs at a higher rate from simultaneous than from sequential lineups. However, this difference largely disappears when moderator variables approximating real world conditions are considered. Also, correct rejection rates were significantly higher for sequential than simultaneous lineups and this difference is maintained or increased by greater approximation to real world conditions. Implications of these findings are discussed.

Bias↗
PubMed2000

E-mail marketing grows up: a primer for the managed care industry.

Managed care plans are jumping onto the electronic marketing bandwagon in a big way, taking advantage of not only the basic E-mail system but also expanding on that medium and developing creative vehicles to send the health plan's message. In this article, the author describes how E-mail technology is being used to hone the marketing edge in MCOs.

Computer Communication Networks↗
PubMed1994

Consistency of children's hemodynamic responses to laboratory stressors.

Hemodynamic responses to three standard laboratory stressors (i.e., postural change, video game, forehead cold) were evaluated in 341 children (170 males) who had a mean age of 11.2 +/- 2.6 years. Inter-task consistency was evaluated for five physiological parameters for all stressor pairings. Evidence of consistency in systolic and diastolic blood pressure, heart rate, cardiac output, and total peripheral resistance responses to all three stressors was observed. The highest and most consistent correlations across stressors were observed for cardiac output and total peripheral resistance responses. The need for clarification in the categorization of laboratory stressors used to measure reactivity is discussed.

Blood Pressure↗
PubMed1974

Peak shift as a function of multiple schedules of reinforcement.

Pigeons were trained to respond to two stimuli on the wavelength continuum, 550 nm and 570 nm, each correlated with an independent schedule of reinforcement. The multiple schedule component in effect during 550 nm (S1) was always a variable-interval 1-min. During the 570-nm stimulus (S2) the second component of the schedule was either variable-interval 30-sec, 1-min, 2-min, 5-min, or extinction for different groups of birds. Generalization gradients were obtained after this training, with the following results: (1) response rate to S1 during training was related to the reinforcement frequency associated with S2; the distribution of responding during generalization testing was a function of the schedules of reinforcement used during training and the response rates they produced. Decreases in the relative frequency of reinforcement correlated with S2 resulted in increases in the distribution shift of responses away from S2 during generalization testing.

Journal Article↗
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Computer Communication Networks↗