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Biomedical subjects

J H Mayer

Publications and source records attributed to J H Mayer.

31 records · Page 2Linked to original sources
PubMed1981

Arrhythmias documented by 24-hour continuous ambulatory electrocardiographic monitoring in young women without apparent heart disease.

Results are reported of 24-hour ambulatory ECG recordings in 50 young women without apparent heart disease. During waking periods, maximum (sinus) rates ranged from 122 to 189 beats/min (bpm) (153 +/- 14 mean +/- SD) and minimum rates from 40 to 73 bpm (56 +/- 7). During sleeping periods, maximum and minimum rates ranged from 71 to 128 bpm (105 +/- 13) and from 37 to 59 bpm (48 +/- 6), respectively. Thirty-two subjects (64%) had atrial premature beats, with only one subject (2%) having greater than 100 beats/24 hrs. Twenty-seven subjects (54%) had ventricular premature beats, with only three subjects (6%) having greater than 50 beats/24 hrs. One subject (2%) had one three-beat episode of ventricular tachycardia. Two subjects (4%) had transient type I second-degree atrioventricular block.

Adult↗
PubMed1979

Longitudinal study of cognitive abilities and academic achievement.

Assessment was made of the effectiveness of a battery of cognitive tests administered in kindergarten in the prediction of sixth grade achievement in reading comprehension, spelling, language usage, and arithmetic. Cognitive abilities included several factors of intelligence, visual perception and visual sequential memory, visual-motor integration, and auditory perception and auditory sequential memory. Measures of prior learning were also included. Subjects were 58 children in a suburban public school district. A criterion for predictive utility for correlation coefficients was established, and simple correlation coefficients for various kindergarten measures and sixth grade achievement ranged from the criterion of .35 to .69. In partial correlations with the effects of ability to understand ideas expressed in words removed, correlation coefficients for various cognitive measures and achievement tests ranged from the criterion of .35 to .63. Combinations of kindergarten measures having optimal multiple correlations with later school achievement generally approached or exceeded .70. These findings are discussed and suggestions are made for further research.

Achievement↗
PubMed1978

Subclavian artery approach for insertion of intra-aortic balloon.

Subperiosteal clavicular resection for access to the subclavian artery is described. In those patients requiring intra-aortic balloon placement in the nonsurgical setting, such an approach provides a reasonably benign alternative when aortoiliac atherosclerosis prevents the usual retrograde femoral placement. Little morbidity or functional compromise is associated with clavicular wedge resections, and the anatomic availability of a large artery without the need for major surgical maneuvers in these gravely ill patients is a distinct advantage.

Aorta, Abdominal↗
PubMedDate not supplied

Axonal transport and nerve conduction and their relation to nerve polyol and myo-inositol levels in spontaneously diabetic BB/D rats.

This study examined orthograde axonal transport of choline acetyltransferase activity and motor nerve conduction velocity in insulin-treated diabetic and nondiabetic rats of the BB/D strain. In the same animals sciatic nerve contents of glucose, fructose, sorbitol, and myo-inositol were measured to determine whether any functional defects coexisted with polyol pathway activity or myo-inositol depletion. There were no differences between controls and diabetics in conduction velocity or the accumulation of choline acetyltransferase activity proximal to a 24-h sciatic nerve constriction. The latter finding implies no defect of axonal transport of the enzyme. At death the control rats were normoglycemic (mean blood glucose, 6.2 +/- 0.3 mmol/L) and the diabetic rats were moderately hyperglycemic (mean blood glucose, 18.1 +/- 1.3 mmol/L). The sciatic nerves of the diabetic rats showed marked elevation of glucose levels, moderate fructose accumulation and slight sorbitol accumulation. However, the myo-inositol levels were similar to those of control nerves. The findings suggest that, in BB rats with the degree of insulin treatment used here, myo-inositol levels were normal and that this co-existed with nerve conduction and axonal transport measurements which were similar to controls.

Animals↗