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Biomedical subjects

R R Peterson

Publications and source records attributed to R R Peterson.

17 recordsLinked to original sources
PubMed1990

[Adrenoganglioplegia as a method of correction of hemodynamic disorders in surgical patients with initial hypotension].

The possibility to use adreno- and ganglionic blockaders in the operative period in surgical patients with initial hypotension is considered. The examinations performed in 37 patients have shown that addition of adreno- and ganglionic blockaders to routine correcting therapy results in earlier (after premedication) and more economical (at the expense of elevation of the initial low peripheral vascular resistance) arrest of the initial hypotonia.

Adolescent↗
PubMed1989

Effect of backward priming on word recognition in single-word and sentence contexts.

Backward priming was investigated under conditions similar to those used in lexical ambiguity research. Subjects received prime-target word pairs that were associated either unidirectionally (BABY-STORK) or bidirectionally (BABY-CRY). In the first experiment, targets were presented 500 ms following the onset of visual primes, and subjects made naming or lexical decision responses to the targets. Forward priming was obtained in all conditions, while backward priming (i.e., priming for pairs in which there was a unidirectional target-to-prime association, as in BABY-STORK) occurred only with lexical decision. In the second experiment, primes were presented auditorily, either in isolation or in a sentence. Targets followed the offset of the primes either immediately or after 200 ms. Backward priming occurred with both response tasks, but only when the prime was an isolated word. In addition, backward priming decreased over time with the naming task, but not with lexical decision. These results suggest that the locus of the backward priming effect is different for the two response tasks. Further, the lack of a backward priming effect with sentence contexts suggests that backward priming cannot account for the demonstrations of multiple access in the lexical ambiguity literature. These results, therefore, support a context-independent view of lexical access.

Adult↗
PubMed1988

Malignant fibrous histiocytoma in a bonnet macaque (Macaca radiata).

Spontaneous sarcomas, not associated with an underlying disease, appear to be relatively rare in nonhuman primates. Since 1970, there have been few reported cases of naturally-occurring sarcomas of any kind in these species. A malignant histiocytoma and malignant fibrous histiocytoma have been described in a rhesus macaque and baboon, respectively. A malignant fibrous histiocytoma is defined as a sarcoma of varied pattern consisting of a mixture of histiocytic and fibroblastic elements. It is thought that the two cells types arise from a common precursor or that the fibroblastic elements are derived from the histiocytes. These tumors are relatively common in humans. Here we report a case of spontaneously-occurring malignant fibrous histiocytoma in an adult bonnet macaque.

Animals↗
PubMed1986

Oblique magnetic resonance imaging of the cardiovascular system.

This exhibit demonstrates that cardiac anatomy can be imaged by MRI in oblique planes that are equivalent to views obtained radiographically or at angiocardiography. These MR images may be obtained either by simple patient positioning or by electronic rotation of the imaging axis. The advantages of this technique include its simplicity and its ability to show detailed anatomy noninvasively. Major cardiac structures including chambers, walls, vessels and bronchi are optimally demonstrated in long axis or cross section. This permits estimation of chamber volume, wall thickness, vessel position and variations from normal. Smaller structures are also well visualized. These include the pericardium, papillary muscles, azygos vein and some cross sectional anatomy of the coronary arteries and veins. The valvular structures can be shown during diastole or systole. The ability of MRI to show these cardiac structures due to the intrinsic contrast differences in signal intensity between muscle, fat, flowing blood and lung suggest an important future for MR cardiac imaging in a broad group of congenital and acquired diseases of the heart, pericardium and great vessels.

Heart↗
PubMed1986

Anatomy of the perirenal area.

The authors comment on the use of the renal bridging septa as a sign in distinguishing compartmentalization of the perinephric space. They also address new concepts regarding the spread of pancreatic effusions and provide information on other anatomic features of the perirenal area.

Drainage↗
PubMed1978

Cost improvement program generates major savings.

The rationale and components of a model for containing and reducing costs are described in this article. The project-oriented program, which uses cross-functional teams as well as individual participants, encourages employees to be aware of the need for cost effective performance.

Costs and Cost Analysis↗
PubMedDate not supplied

Superior diaphragmatic lymph nodes: CT assessment.

The normal CT appearance of the superior diaphragmatic (also called cardiophrenic angle or pericardial) lymph node group was assessed in 39 adult patients who were free of diseases known to involve lymph nodes. In 15 patients there were 27 ovoid opacities, corresponding to known lymph node sites, namely in the anterior portion of the diaphragm; all except one opacity measured less than 5 mm in diameter. Superior diaphragmatic lymph nodes greater than or equal to 6 mm in diameter were observed in 30 of 190 patients with diseases known to be associated with lymphadenopathy. All but one of these patients had a pathologically proven malignant neoplasm, with bronchogenic carcinoma the most common etiology.

Adult↗