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Biomedical subjects

G M Clark

Publications and source records attributed to G M Clark.

At least 505 records · Page 28Linked to original sources
PubMed1980

Antigenicity and protective effects of type 3 pneumococcal polysaccharide in rats.

The response to type 3 pneumococcal polysaccharide vaccination, the protective effect of type 3 pneumococcal polysaccharide vaccination, and the ability of hemagglutinating antibody to type 3 pneumococcal polysaccharide to cross the blood-brain barrier were studied in rats. Hemagglutinating antibody response to vaccination with type 3 pneumococcal polysaccharide was found to be dependent on the dose and route of inoculation. Intraperitoneal vaccination with type 3 pneumococcal polysaccharide protected the rats from subsequent intraperitoneal challenge with type 3 Streptococcus pneumoniae but had no effect after intracisternal challenge with type 3 S. pneumoniae. In the presence or absence of sterile meningeal inflammation, hemagglutinating antibody could not be found in cerebrospinal fluid of animals vaccinated intraperitoneally with type 3 pneumococcal polysaccharide. These results suggest that type 3 pneumococcal polysaccharide is antigenic in rats and intraperitoneal vaccination with type 3 pneumococcal polysaccharide does not protect against experimental meningitis because antibodies do not cross the blood-brain barrier.

Agglutinins↗
PubMed1979

Complications with heparin-lock needles.

The incidence of phlebitis was determined for heparin-lock needles after use of three different methods of skin preparation and follow-up care. Phlebitis was significantly more frequent when iodophor solution and iodophor ointment, respectively, were used than when iodophor solution alone was used for heparin-lock needles in use longer than 48 hours, with more than ten manipulations of the systems, and when only one drug was infused through the systems. Iodophor solution skin preparation followed by daily application of iodophor solution is recommended to minimize the occurrence of associated phlebitis.

1-Propanol↗
PubMed1979

Childhood cancer: nonmedical costs of the illness.

The financial burden of cancer treatment is a major source of anxiety for the families of pediatric cancer patients. Parents of these patients report that nonmedical, out-of-pocket expenditures are the most troublesome because, unlike medical bills, nonmedical costs must be paid immediately and are rarely reimbursed. Data on nonmedical expenditures (transportation, food, lodging, clothing, family care, and miscellaneous) were collected from 70 patients' families for one-week periods at three-month intervals. Multiple regression analysis was carried out to ascertain the factors influencing costs. Factors contributing to nonmedical costs included level of care, the patient's Performance Status, distance from the treatment center, and family size. Thirty-two families reported loss of pay when one or both parents accompanied the child to the hospital. When this loss was combined with the nonmedical costs, the results indicated a serious strain on the family budget. For half the families surveyed, the total expenses plus loss of pay amounted to more than 25% of the weekly family income.

Adolescent↗
PubMed1979

Burn wound biopsy bacterial quantitation: a statistical analysis.

Sequential paired punch biopsy samples were taken from three separate locations on each of four burn patients and were quantitated for the number of viable bacteria per gram of tissue. The range (log10 0.02 to log10 1.51) and the standard deviation (log10 0.67) were determined for each pair. The 95 per cent confidence interval based on any single observation, x, was determined to be x +/- 1.31. It is concluded that the burn wound biopsy is a reliable procedure for quantitating organisms in a burn wound and that changes in sequential samples give an indication of the dynamics of infection in the burn patients.

Bacteria↗
PubMed1979

Adaptation of siblings to childhood malignancy.

To explore the impact of childhood cancer, school-aged patients and their healthy siblings from 71 families were given one or more of the following psychologic tests: the Piers-Harris Children's Self-Concept Scale, the Bene-Anthony Family Relations Test, and the Thematic Apperception Test. The siblings showed even more distress than the patients in the areas of perceived social isolation, perception of their parents as overindulgent and overprotective of the sick child, fear of confronting family members with negative feelings, and concern with failure (older siblings only). In other areas, such as anxiety and vulnerability to illness and injury, the patients' and siblings' experience appeared very similar. These results indicate that siblings, like patients, experience severe stress when confronted with a chronic, life-threatening illness such as cancer. In recognizing and attending to their needs, one can practice primary prevention in pediatrics by facilitating their healthy adaptation to a very difficult situation.

Adaptation, Psychological↗
PubMed1979

A cochlear implant round window electrode array.

This multiple-electrode array for round window cochlear implantation is a robust, reliable system for inserting 20 mm along the scala tympani with a minimum of trauma and can provide for bipolar stimulation.

Cochlea↗
PubMed1979

Effects of genetic vestibular defects on behavior related to spatial orientation and emotionality.

A large battery of behavioral tests was administered to normal mice and to mice with varying degrees of otoconial agenesis due to genes affecting vestibular development. Many significant differences were found, but a factor analysis revealed that the variance on the 11 best tests could be accounted for in terms of two underlying variables. Factor I, the more important of the two, was associated with activity, habituation, and spontaneous alternation. Factor II appeared to represent a fear of new stimuli or situations. In both cases factor scores were highly related to the degree of otoconial deficiency. One subgroup of mice with severe otoconial agenesis displayed hyperactivity and a total absence of either habituation or spontaneous alternation. In these animals, brain and body development were stunted, and the reactions to amphetamine and physostigmine were opposite to those seen in normal mice. The results support the idea that the static organs contribute importantly to spatial orientation and suggest that early-onset vestibular defects can result in profound alterations of emotionality.

Acetylcholine↗
PubMed1979

Metabolic profiles of thermal trauma.

The study was designed to establish where significant correlations exist in a variety of metabolic substrates and hormone mediators in patients sustaining thermal injury. The factors studied were insulin, human growth hormone, cortisol, glucagon, free fatty acid, triglyceride and glucose. Incorporated into this design was an evaluation of the impact of quantitated severity of injury upon these correlations. In patients sustaining a low severity of injury (Probability of death (p = 2.2 to 33.9) there appeared a loss of glucose regulation in conjunction with insulin resistance without significant interplay of other factors studied. In contrast, patients sustaining high severity injury (p = 46.9 to 100) evidenced correlations between glucagon and glucose (negative), cortisol and free fatty acid indicating a significant role of hyperglucagonemia in these patients. A discriminant function analysis was employed to incorporate all significant variables into a probability model. Only insulin, glucose and glucagon appeared in the optimal classification equation.

Adolescent↗
PubMed1979

Response to influenza A vaccine among high-risk patients.

In recent years, it has been recommended that "high-risk" patients receive influenza immunizations annually. During the 1976 National Influenza Immunization Program, a higher priority was given to these patients than to the general population. The present study was undertaken to compare the antibody response of high-risk patients with that of a group of individuals with no underlying disease after immunization with 0.5 ml of bivalent, split-virus vaccine containing 200 CCA units each of influenza A/New Jersey/76 and A/Victoria/75. Sera were obtained before and after immunization from 41 "healthy" volunteers and from 57 cariology, 31 hematology, 13 hemodialysis, and 16 renal transplant patients. The control, cardiology, and hemodialysis groups responded equally well to A/Victoria/75 antigen, but the hematology and renal transplant groups did not respond as well (P less than .05). Only the hematology patients responded at a significantly lower level (P less than .05) than the control group to A/New Jersey/76. The control and renal transplant groups had a significantly greater response to A/New Jersey/76 antigen than to A/Victoria/75 antigen (P less than .002). Although the same pattern was demonstrated by the other patient groups, the differences were not significant. Because hematology and renal transplant patients responded relatively poorly to influenza immunization, prophylactic administration of amantadine during influenza outbreaks should be considered in patients with renal function adequate to excrete this drug.

Antibodies, Viral↗
PubMed1979

Critical bands following the selective destruction of cochlear inner and outer hair cells.

Critical bandwidths and absolute intensity thresholds were measured in cats before and after kanamycin treatment which induced selective inner and outer hair cell losses. Hair cell losses were measured from cochleograms constructed from surface preparations of the organ of Corti. Results suggested that, for the test frequencies and stimulus intensities employed, critical bandwidths were not affected for frequencies tonotopically located in cochlear regions where only outer hair cells were lost. Critical bands were widened or not measurable only when inner hair cell losses exceeding 40% were also associated with complete loss of outer hair cells. The experiment suggests that cochlear frequency selectivity can be mediated by inner hair cells alone.

Animals↗
PubMed1978

Frequency discrimination following the selective destruction of cochlear inner and outer hair cells.

Frequency discrimination was measured behaviorally before and after drug-induced lesions of cochlear hair cells in the cat. Discrimination was unaffected by complete loss of outer hair cells provided that at least 50% of inner hair cells were intact. Thus, inner hair cells are important for frequency discrimination, and they can function normally in this regard without the influence of outer hair cells.

Animals↗