Search PubMed⌕ Search

Biomedical subjects

D Hill

Publications and source records attributed to D Hill.

At least 199 records · Page 11Linked to original sources
PubMed1992

Development and validation of a behavioral observation measure for the syndrome of psychosis, intermittent hyponatremia, and polydipsia.

A behavioral observation scale (Virginia Polydipsia Scale; VPS) for monitoring drinking patterns was developed and its reliability tested during 25 hours of tandem ratings among six patients with the syndrome of psychosis, intermittent hyponatremia, and polydipsia (PIPS). These ratings were compared to those collected from a control group of six psychiatric inpatients who were similarly observed for 25 hours. The scale was subsequently used to assess day-long drinking in a single PIPS patient. Results demonstrated that the VPS can be reliably administered by trained raters and that it clearly differentiates the drinking patterns of PIPS patients from controls. In addition, our findings highlight associations among drinking behaviors, psychiatric functioning and low serum sodium concentration. On balance, these results support using observational measures of drinking behaviors in future studies of PIPS patients.

Adult↗
PubMed1992

Melanoma prevention: behavioral and nonbehavioral factors in sunburn among an Australian urban population.

BACKGROUND: To determine the independent contribution of behavioral factors to the occurrence of sunburn, sun protection behavior was assessed over 13 successive summer weekends in a total of 1,655 adults in Melbourne, Australia. METHODS: Telephone survey respondents provided detailed accounts of activities engaged in, time spent outside, and hat, clothing, and sunscreen coverage in the 4 hr around the solar midday on both weekend days, as well as skin type, sociodemographic descriptors, and degree of sunburn experienced. Independent measures of atmospheric temperature and ambient ultraviolet radiation (UVR) were added to individual records. RESULTS: The (mostly recreational) weekend sunburn in this urban sample was strongly associated with UVR, as expected. Temperature at 3 PM, sensitive skin type, youthfulness, and being male were also independently associated with sunburn. After all other predictors were controlled for, the body exposure index (which took into account time outside and hat, clothing, and sunscreen coverage) made a strong independent contribution to the explanation of sunburn (P < 0.001). CONCLUSION: It was concluded that behavior change strategies to prevent malignant melanoma of the skin are warranted.

Adolescent↗
PubMed1992

The role of frontal lobe functioning in the development of infant self-regulatory behavior.

In the last two decades, there has been tremendous growth in two fields of study related to human infant development: (1) the development of neural processes during the early postnatal years and (2) the development of self-regulatory behavior. In an attempt to stimulate research on the relation between early brain development and self-regulatory processes, several hypotheses pertaining to the role of frontal lobe functioning in the development of emotion regulation during infancy are proposed. The results of a study of the relation between frontal electroencephalographic (EEG) activity and emotional behavior of 21-month-old infants are reported. It was found that increases in frontal lobe activation were associated with increases in emotional arousal, while EEG activity recorded from the parietal region showed either a reciprocal pattern of activation or did not change as a function of level of emotional arousal. These results provide evidence for the specialized role of the frontal lobe in mediating emotional behavior during infancy.

Age Factors↗
PubMed1992

Why children start smoking cigarettes: predictors of onset.

We review findings from 27 prospective studies of the onset of cigarette smoking conducted since 1980. Almost 300 measures of predictors of smoking onset were examined, and 74% of them provided multivariate support for predictors of onset derived from theory and previous empirical findings. Expected relationships were strongly supported for (a) socioeconomic status, with students with compromised status being more likely to try smoking; (b) social bonding variables, particularly peer and school bonding, with less support for family bonding; (c) social learning variables, especially peer smoking and approval, prevalence estimates, and offers/availability, with less consistent support for parent smoking and approval; (d) refusal skills self efficacy; (e) knowledge, attitudes and intentions, with the expected stronger predictions from intentions than from attitudes than from knowledge; and (f) broad indicators of self-esteem. The few investigators who analyzed their data separately by age, gender, or ethnicity found many differences by these factors, though there were too few of them to detect any pattern with confidence. Though the 27 studies are far from perfect, we believe that they confirm the importance of many well-accepted predictors and raise some questions about others. In particular, family smoking, bonding and approval each received unexpectedly low support. It is not clear whether this lack of support reflects reality as it has always been, is due to a changing reality, reflects developmental changes, either in the age of subjects or the stage of onset, or is due to poor measurement and too few tests. Future prospective studies need to be theory-driven, use measures of known reliability and validity, report analyses of scale properties, and use statistical methods appropriate to the hypotheses or theories under study. Finally, we encourage more investigations of the potentially different predictors of transitions to experimental or regular cigarette smoking. This will require multi-wave studies and careful measurement of changes in smoking behavior.

Adolescent↗
PubMed1992

An analysis of reported discomfort caused by mammographic X-ray amongst attenders at an Australian pilot breast screening program.

The aims of the study were to describe levels of discomfort experienced by women undergoing screening mammography; examine correlates of discomfort experienced and to examine whether the degree of discomfort experienced was perceived as a deterrent for re-screening. The study involved ninety five attenders at the pilot mammography screening program in Melbourne, Victoria. Women completed a questionnaire one or two days after having a screening mammogram. Pain was assessed on a seven point scale. Information was obtained on a number of possible correlates such as breast tenderness, perceptions of the service received and expectations of discomfort. Eighty-eight women were re-interviewed three months later about recall of discomfort and whether this would deter them from future mammography. Results were as follows: Thirty per cent of women reported no discomfort, 60% mild or moderate discomfort and 10% severe discomfort or worse. The degree of discomfort reported was not significantly related to age, breast tenderness in the previous three days, previous symptoms, previous mammographic experience, or outcome of visit. The degree of discomfort was related to retrospectively reported expectation of discomfort (r = .336; p = .001); reported lack of confidence in the staff taking the X-ray (r = .184; p = .039); perceptions of awkwardness (r = .175; p = .049) and unpleasantness (r = .297; p = .002) of the examination position. No woman said discomfort would definitely stop her having another screening mammogram. Three per cent said that it might stop them, while 97% of women said that it would not stop them at all.(ABSTRACT TRUNCATED AT 250 WORDS)

Breast↗
PubMed1992

Diagnosis and surgical management of endometriomas.

Fifty two patients with endometriomas greater than 1 cm were treated by surgical excision either with or without ovarian closure. Diagnosis is reliable when clinical features of the pain, vaginal ultrasound, and laparoscopy, including ovarian mobilization and needling, are considered. Fifty of 52 patients were free of pain after 1 year and 26 (50%) became pregnant within 1 year. A second laparoscopy is justified if pain persists or pregnancy does not occur. Adhesive disease was the most common complication (40%), and persistent or recurrent endometriosis occurred in 15%. Surgery by laparoscopy with drainage and excision of the endometrioma without ovarian sutures may be more effective than excision of the endometrioma and ovarian suture.

Endometriosis↗
PubMed1992

Laparoscopic adnexectomy--indications, technique and results.

Laparoscopic adnexectomy was performed successfully in 38 patients in whom the procedure was attempted. Failure may result from inexperience of the surgeon or when preliminary dissection near bowel suggests trauma is likely. The duration of the operation was between 15 and 105 minutes, blood loss was minimal and all but 2 patients were discharged within 24 hours of surgery. Pain was relieved in 33 of 35 patients in whom this was the dominant symptom. In 1 patient a small ovarian remnant implanted on the bladder was removed at subsequent laparoscopy. Preliminary experience of this procedure suggest it may be preferable to laparotomy because of the reduced risk of wound complications, pain, time in hospital and duration of convalescence.

Adolescent↗
PubMed1992

Preferences of rural Victorian women for screening mammography services.

The aim of this study was to examine rural women's access to regional fixed-site screening mammography services and their preferences for either a mobile service or a fixed-site centre. One hundred and thirty-seven women aged 49 to 69 from rural Victoria were interviewed in June 1991. Eighty-five per cent of women normally go to major towns which are possible screening sites at least once every six months, spending an average of five hours each visit. Around 77% of women said they would be likely to go to a fixed site while 86% said they would be likely to go to a mobile service. If the fixed-site centre was at a major town not usually frequented, this would be a deterrent to 58% of women. A decision to widely implement mobile screening in rural areas of Victoria is not justified at this time, but pilot mobile services should be considered.

Aged↗
PubMed1992

Effects of phosphate loading on metabolic and myocardial responses to maximal and endurance exercise.

Six trained male cyclists and triathletes participated in a double blind study to determine the effects of phosphate loading on maximal and endurance exercise performance. Subjects ingested either 1 gm of tribasic sodium phosphate or a glucose placebo four times daily for 3 days prior to performing either an incremental maximal cycling test or a simulated 40-km time trial on a computerized race simulator. They continued the supplementation protocol for an additional day and then performed the remaining maximal or performance exercise test. Subjects observed a 17-day washout period between testing sessions and repeated the experiment with the alternate supplement regimen in identical fashion. Metabolic data were collected at 15-sec intervals while venous blood samples and 2D-echocardiographic data were collected during each stage of exercise during the maximal exercise test and at 8-km intervals during the 40-km time trial. Results indicate that phosphate loading attenuated anaerobic threshold, increased myocardial ejection fraction and fractional shortening, increased maximal oxidative capacity, and enhanced endurance performance in competitive cyclists and triathletes.

Adult↗
PubMed1992

Localization of alg, opr, phn, pho, 4.5S RNA, 6S RNA, tox, trp, and xcp genes, rrn operons, and the chromosomal origin on the physical genome map of Pseudomonas aeruginosa PAO.

The genes encoding the rrn operons, the 4.5S and 6S RNAs, elements of protein secretion, and outer membrane proteins F and I, and regulatory as well as structural genes for exotoxin A, alkaline phosphatase, and alginate and tryptophan biosynthesis, were assigned on the SpeI/DpnI macrorestriction map of the Pseudomonas aeruginosa PAO chromosome. The zero point of the map was relocated to the chromosomal origin of replication.

Chromosome Mapping↗
PubMed1992

Barriers to cervical screening in older women.

OBJECTIVE: To explore the reasons why some older women do not have regular Papanicolaou smear tests. SETTING: The Ballarat region of Victoria. DESIGN AND METHOD: Cross-sectional survey administered by telephone interview. SAMPLE: Three hundred and forty-seven women aged 40 to 70. RESULTS: 1. 41% of women had not had a Papanicolaou smear test within the preceding 2 years. 2. Women who agreed with the statement that healthy women do not need to have Papanicolaou tests were six times more likely to be overdue for a Papanicolaou test than women who did not agree. 3. Being over 60 significantly increased the likelihood that a woman would be overdue for a Papanicolaou test, compared with younger women. 4. Women who thought that the test is only needed at intervals of 3 years or more were over six times more likely to be overdue than women who believed the interval to be 2 years or less. 5. Women who perceived themselves as being too embarrassed were nearly seven times more likely to be overdue than women who claimed no embarrassment. 6. Women who saw themselves as being too busy to have the test were three times more likely to be overdue than women who did not see themselves this way. 7. Women with a spouse were less likely to be overdue than other women. 8. Women who knew to start having Papanicolaou tests when they were sexually active were less likely to be overdue than women who did not know this. CONCLUSION: Many of these barriers can be overcome by the clinician in routine practice.

Adult↗
PubMed1992

Frontal lobe activity and affective behavior of infants of mothers with depressive symptoms.

Studies of adults and infants indicate that the left frontal brain region is specialized for approach emotions, such as joy, whereas the right frontal region is specialized for withdrawal emotions, such as distress. Furthermore, depressed adults have been found to show reduced brain activity in the left frontal region. In this study, frontal and parietal electroencephalographic (EEG) activity was recorded from 27 infants aged 11-17 months (13 of whose mothers reported elevated depressive symptoms) during baseline and emotion-eliciting conditions. Compared with infants of nonsymptomatic mothers, infants of symptomatic mothers exhibited reduced left frontal brain activity during playful interactions with their mothers and failed to exhibit the typical pattern of greater right frontal activity during a condition designed to elicit distress (maternal separation). Infants of symptomatic mothers also showed less distress during maternal separation; however, no group differences in behavior were found during the playful condition. Group differences were evident in the frontal region, but not in parietal brain activity.

Affect↗
PubMed1991

Management of submucous uterine fibroid with buserelin, gemeprost and hysteroscopic resection.

A 19-year-old virgin presented with severe menorrhagia and a haemoglobin level of 76 g/L as a problem of management. A 5 cm diameter submucous fibroid was identified at hysteroscopy and biopsied but was unable to be removed. The luteinising hormone releasing hormone agonist, buserelin, was used in an attempt to produce symptomatic relief. One week after commencing buserelin therapy, severe menorrhagia occurred and the patient was admitted to hospital with a haemoglobin concentration of 24 g/L. Buserelin treatment was continued and no further menstruation occurred over the following year. As the patient was now well, hysteroscopic submucous fibroid resection was contemplated. Due to cervical rigidity in this teenager, a 1 mg gemeprost pessary was inserted into the posterior vaginal fornix three hours before surgery. This allowed an operative hysteroscope to be inserted into the uterus and a fibroid resection to be performed. Menstrual blood loss has been normal for six months after hysteroscopy. A combined medical and surgical approach may avoid hysterectomy in such problem patients.

Adult↗
PubMed1991

A semi-automated method for breathing rate measurement in the mouse.

A semi-automated system of breathing rate measurement for the assessment of lung damage in mice has been developed. Based on the plethysmographic method, a BBC B microcomputer plus Torch CPM examines four plethysmographs at any given time, looking for periods of quiet breathing and measuring the breathing rate during rest. This requires both machine code and Microsoft Basic programs, linked using Microsoft Link 80. The results correlated closely with results obtained using the well-validated measurement of chart recorder assessed breathing rate. Using the computer method, up to 40 animals could be examined per hour.

Animals↗
PubMed1991

"Goodbye Sunshine": effects of a television program about melanoma on beliefs, behavior, and melanoma thickness.

Of 333 persons interviewed after a television show about the effects of melanoma, 113 (34%) saw the show and 73% believed that the sun protection/skin examination message applied to them. Fifty-six percent of persons examined their own skin and 36% examined someone else's skin after seeing the program. Fifteen persons (4.5% of the total sample) planned to visit a doctor for an abnormal skin spot as a result of the program, of whom three actually did so within 4 weeks of the show. An increase of 167% was observed in the number of melanomas diagnosed in the 3 months after the show, compared with those diagnosed in the same period the year before. There was a significant shift in the proportion of tumors removed in the thin, easily cured stage. The high rate of diagnosis of new tumors and the high proportion of thin tumors was maintained a year after the program. By extrapolation from these figures, it is estimated that 208,000 Victorians out of a total population of 4.1 million intended to seek a consultation after a single television program. Of these, it is estimated that about 27,000 actually sought attention in the month after the viewing.

Adolescent↗
PubMed1991

Development and validation of an instrument to measure satisfaction of participants at breast screening programmes.

A reliable and valid questionnaire has been developed to measure the satisfaction of participants with service offered at mammography screening programmes. The questionnaire measures five specific aspects: convenience and accessibility, staffs' interpersonal skills, information transfer between staff and client, physical surroundings and perceived technical competence of staff. A general satisfaction dimension was also included. Systematic procedures were followed to ensure that the initial pool of items met the criteria for satisfactory content validity. These procedures included extensive literature review and interviews with participants and service providers. Discriminant validity was assessed by a modified Q-sort procedure, where eight expert judges sorted items into relevant dimensions. The sample for other validity and reliability testing consisted of 584 women who were participants at a breast X-ray programme in Melbourne, Australia. Concurrent validity was demonstrated by considering the correlation of the sum of the subscale scores for each respondent with their score on the general subscale (r = 0.76; P less than 0.001). Multiple regression was used to provide further evidence for the discriminant validity of the proposed subscales and support for the multidimensional conceptualism of satisfaction. Scores on the general satisfaction subscale were used as an outcome variable and other subscale scores were predictor variables. All subscale scores significantly contributed to the prediction of satisfaction, over and above that of other subscales (R2 = 0.59). This indicates that these subscales are measuring distinct dimensions of satisfaction. Cronbach's alpha of each subscale was over 0.50, indicating that the subscales are reliable. The instrument is a potentially useful tool for assessing the quality of care at mammographic screening services and could be used routinely by such services to monitor satisfaction.

Australia↗