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Biomedical subjects

M W Ross

Publications and source records attributed to M W Ross.

At least 145 records · Page 8Linked to original sources
PubMed1989

Surgical diseases of the equine cecum.

Cecal impaction and cecal perforation, the two most common equine cecal diseases, are thought to develop after slowing or interruption of a single progressive motility pattern, which begins in a pacemaker area near the apex, occurs once every 3 minutes, and propels ingesta from the cecum to the right ventral colon. Rectal examination in horses with cecal impaction is the most useful technique to grade the severity of the condition. Medical treatment is undertaken if the impaction is judged to be mild to moderate. Surgical correction of cecal impaction in severe cases requires a ventral midline celiotomy, and exploration reveals a large ingesta-filled cecum and relatively empty large colon. Currently, the techniques of typhlotomy with manual evacuation of ingesta, combined with a complete bypass of the cecum by use of a jejunocolostomy, is the preferred method of surgical management. The use of a cecocolic anastomosis remains a viable alternative surgical procedure. Cecal perforation (CP), a uniformly fatal disease of horses, most often develops when the subtle signs of cecal impaction are missed or are masked by the administration of nonsteroidal antiinflammatory agents. CP can occur in mares around the time of foaling and, in this form, is not associated with cecal outflow dysfunction. Surgical management of cecocecal or cecocolic intussusception is required and involves resection of the diseased portion of cecum, either with extra- or intraluminal techniques. Both the side-to-side and end-to-side jejunocecal anastomoses are useful and successful techniques for bypass of simple or strangulating lesions of the ileum.

Animals↗
PubMed1989

A preliminary study of social issues in AIDS prevention among adolescents.

Educational efforts to prevent the spread of AIDS require a combination of accurate information and the application of that information to personal behavior. In this preliminary study, a scale was developed to evaluate the social and interpersonal skills of adolescents in AIDS-related and non-AIDS-related interactions. The instrument was administered to 101 Australian students in grades 10 and 11 of an urban high school. Findings indicate ratings of AIDS-related activities of the adolescents were not significantly different from their other social activities, suggesting levels of comfort and assertiveness among adolescents in AIDS-related activities can be modified. Students felt most anxious about problems with sexually transmitted diseases or drug use, suggesting difficulty in dealing with the possible public disclosure of these stigmatized conditions. Data suggest both individual and group scores among adolescents may improve on the five dimensions of the scale following interventions to promote social and interpersonal skills designed to apply knowledge obtained from AIDS education.

Acquired Immunodeficiency Syndrome↗
PubMed1989

Changes in sexual behaviour between 1986 and 1988 in matched samples of homosexually active men.

Matched samples of homosexually active men were obtained using identical sampling methods in a city of one million people in 1986 and 1988. Data indicated that reported sexual behaviours had significantly changed in the direction of safer sex, particularly oral sex without ejaculation, anal sex with a condom (both insertive and receptive), which increased in frequency, and analingual and digitoanal receptive practices, wet kissing, and anal receptive intercourse generally, which decreased. Reported sources of education for both samples were primarily gay media and gay organisations. These data, with some caveats concerning design and comparability of samples, suggest that behavioural change in the appropriate direction has occurred in homosexually active men, and that gay organisations and media have been perceived as the most common source of information on safer sex in this population.

Acquired Immunodeficiency Syndrome↗
PubMed1989

Psychosocial ethical aspects of AIDS.

The psychosocial morbidity associated with HIV infection and responses to such infection may exceed morbidity associated with medical sequelae of such infection. This paper argues that negative judgements on those with HIV infection or in groups associated with such infection will cause avoidable psychological and social distress. Moral judgements made regarding HIV infection may also harm the common good by promoting conditions which may increase the spread of HIV infection. This paper examines these two lines of argument with regard to the ethical aspects of psychological bases of health care, clinical contact, public perceptions of AIDS and the comparative perspective. It is concluded that the psychosocial aspects of HIV infection impose ethical psychological, as well as medical, obligations to reduce harm and prevent the spread of infection.

Acquired Immunodeficiency Syndrome↗
PubMed1989

Gay youth in four cultures: a comparative study.

Young and older homosexual men in four countries (Sweden, Finland, Ireland, and Australia) were compared on a number of psychological, social, and psychometric indices to determine what differences existed between them, and the effect of culture on any such differences. Data show that there are greater differences between younger and older homosexual men as the culture appears more antihomosexual, and that younger homosexual men are less likely to accept their sexual orientation and more likely to accept myths surrounding homosexuality. Younger homosexual men were also more likely to have had gonorrhea (regardless of their number of sexual partners), to prefer receptive anal intercourse, and to have contacted partners by cruising. These data confirm that mental health consequences of antihomosexual environments are most negative where homosexuality is most severely stigmatized.

Adaptation, Psychological↗
PubMed1989

Effects of xylazine and/or butorphanol or neostigmine on myoelectric activity of the cecum and right ventral colon in female ponies.

Effects of xylazine HCl (0.5 mg/kg of body weight, IV) and/or butorphanol tartrate (0.04 mg/kg, IV) or neostigmine methylsulfate (0.022 mg/kg, IV) on myoelectric activity of the cecum and right ventral colon were studied in 4 conscious female ponies. Eight bipolar Ag/AgCl electrodes were sequentially placed on the seromuscular layer of the cecum (6 electrodes) and right ventral colon (2 electrodes). Recordings began 30 minutes before and continued for 90 minutes after drug administration. Each drug or drug combination was studied on 2 occasions in each pony. Two major patterns of coordinated spike bursts were identified. A series of coordinated spike bursts began at the cecal base and was conducted to the cecal apex (pattern I). A series of coordinated spike bursts began at the cecal apex, traversed the cecum, cecocolic orifice, and right ventral colon and was termed a progressive pattern (pattern II). Xylazine administration caused a significant decrease in patterns I and II for 20 minutes (P less than 0.05). Butorphanol tartrate administration caused a significant decrease in the progressive pattern for 10 minutes (P less than 0.05) without affecting the orally directed pattern. Administration of the combination of xylazine/butorphanol significantly decreased the frequency of pattern I for 40 minutes (P less than 0.05) and pattern II for 30 minutes (P less than 0.05). Neostigmine administration caused a significant increase in the frequency of pattern II for 30 minutes (P less than 0.05) without affecting pattern I (P greater than 0.05). Changes in conduction velocity of pattern I or II or the duration of spiking activity were not significantly different because of any treatment.

Animals↗
PubMed1989

Myoelectric activity of the cecum and right ventral colon in female ponies.

The myoelectric activity of the cecum and right ventral colon (RVC) was studied in 4 female ponies. Eight, bipolar Ag-AgCl electrodes were sequentially placed on the seromuscular layer of the cecum (6 electrodes) and RVC (2 electrodes), and recordings were begun 14 days after surgery. The myoelectric activity for each pony was recorded during 12, 60-minute recording sessions done during the interdigestive period (3 to 7 hours after the morning feeding). Coordinated series of spike bursts were recognized as independent motility patterns in the cecum and in the RVC. Local haustra-haustra myoelectric activity involving approximately 40 cm of the cecal body (0.45 +/- 0.03 spike bursts/min) were detected. A series of spike bursts started at the cecal apex and progressed to, but stopped at, the caudal cecal base (0.40 +/- 0.03 spike bursts/min). Infrequently, a series of spike bursts started at the apex and progressed to the cranial cecal base (0.09 +/- 0.01 spike bursts/min). More commonly, a series of spike bursts with a conduction velocity of 3.8 +/- 0.07 cm/s, began in the cranial base and progressed orally to the cecal apex (0.46 +/- 0.03 spike bursts/min). Spike bursts conducted aborally (propulsion) beginning at the origin of the RVC (0.05 +/- 0.007 spike bursts/min) and spike bursts conducted orally (retropulsion; 0.15 +/- 0.02 spike bursts/min) were seen independent of cecal myoelectric activity. A progressive series of coordinated spike bursts, which began at the cecal apex, were conducted through the cecolic orifice and continued into the RVC (0.42 +/- 0.02 spike bursts/min), representing the only pattern common to the cecum and RVC.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1988

Prevalence of risk factors for human immunodeficiency virus infection in the Australian population.

A random, stratified sample of 2601 adult Australians from all states and territories was interviewed about knowledge of the acquired immunodeficiency syndrome (AIDS). After the interview, an anonymous questionnaire on the prevalence of practices that are associated with risk of human immunodeficiency virus (HIV) infection was left with the respondents; 60.2% of these questionnaires were returned. Data from this survey suggest that the prevalences of male homosexual behaviour, prostitute contact and lesbian contact are substantially lower than were estimated previously. Men with homosexual experience were significantly more prevalent in the more populous states, but the majority of other risk factors--intravenous drug abuse, male respondents' contact with prostitutes, transfusion of blood or blood products during 1980-1985 and heterosexual contact--showed few significant associations with geographical, occupational or marital status. Intravenous drug abusers were significantly younger, and heterosexual contact was associated with age for both male and female respondents. No significant differences were found in the prevalence of homosexual contact among single, married and previously-married men, although the prevalence of homosexual contact was lower in married men. The results of the study are discussed in terms of targeting preventive campaigns and assessing the future potential for the spread of HIV infection.

Acquired Immunodeficiency Syndrome↗
PubMed1988

Small colon intussusception in a broodmare.

A 9-year-old pregnant Standardbred broodmare was evaluated for signs of mild abdominal pain, failure to defecate, and mild abdominal distention. Rectal examination revealed the leading edge of a small colon intussusception, and peritoneal fluid analysis indicated suppurative peritonitis. Surgical management, including reduction of the intussusception and small colon resection with end-to-end anastomosis, resulted in successful outcome (1-year follow-up evaluation). Postoperative complications including dehiscence of the ventral midline surgical incision and simple obstruction at the anastomosis site necessitated a second surgical procedure. Small colon intussusception is an uncommon cause of signs of abdominal pain and is similar to type-IV rectal prolapse.

Animals↗
PubMed1988

Distribution of knowledge of AIDS: a national study.

Knowledge of, and attitudes toward, AIDS were assessed in a random sample of over 2600 individuals aged 16 and over in all states and territories of Australia. Those with lower knowledge of AIDS were more likely to be separated, divorced or widowed, older, and more personally concerned about AIDS. There were no differences in knowledge of AIDS across states, or between sexes. Individuals with lower knowledge of AIDS had greater fear of homosexuals, more unrealistic concerns about AIDS, blamed those infected more, were more afraid of the unknown aspects of AIDS, and were more conservative. Individuals who had used intravenous drugs ever and in the past year had significantly lower knowledge of AIDS; for other risk behaviours, there were no significant differences. Individuals who personally knew homosexual people had higher knowledge of AIDS. These data indicate that the determinants of knowledge of AIDS are related more strongly to attitudinal variables than to demographic ones, and that there are few differences in knowledge across those practising at risk behaviours, compared with the general population, with the exception of intravenous drug users.

Acquired Immunodeficiency Syndrome↗
PubMed1988

Attitudes toward condoms as AIDS prophylaxis in homosexual men: dimensions and measurement.

Increases in condom use among homosexually active men are crucial to containing the spread of AIDS. The present study examined the components of attitudes and beliefs toward condom use in homosexual and bisexual men using a modified version of Brown's Attitude toward condoms scale. Factor analysis revealed 5 clear dimensions: viewing condoms as unreliable and unerotic; as protection from infection; as unavailable when needed; as interrupting sex; and viewing condoms as a responsibility and being comfortable with condom use. 5 subscales constructed from these dimensions differentiated significantly between homosexual men who used condoms frequently and infrequently or never. 4 of the subscales (except Protection form Infection subscale) differentiated frequency of oral condom use; only the Responsibility and Comfort with Condom Use subscale differentiated frequency of anal condom use. The Homosexual Attitudes toward Condom use scale demonstrates that: dimensions of beliefs and attitudes toward condom use in homosexually active men differ substantially from those in heterosexual individuals; a reliable and valid scale for measuring such attitudes now exists; factors influencing condom use in this population differ for oral and anal intercourse; and this scale enables further research on determinants of condom use, and effects of modifying attitudes toward condom use in homosexually active men to be carried out.

Acquired Immunodeficiency Syndrome↗
PubMed1988

Monogamy is...

Explore the source record for details and available documents.

Homosexuality↗
PubMed1988

AIDS phobia: report of 4 cases.

Psychological reactions to sexually transmissible disease (STD) infection are common, occurring in up to 85% of some patients with STDs: Hart has suggested that they are among the most common conditions encountered in venereology. Previous psychiatric disturbances in STD patients, however, are relatively uncommon and differ in both etiology and management from such psychological sequelae of STD infection, although both Catalan et al. and Fitzpatrick et al. report that in the United Kingdom, some 40% of STD clinic attenders had General Health Questionnaire scores indicating they were psychiatric cases.

AIDS Serodiagnosis↗
PubMed1988

Ego-dystonic heterosexuality: a case study.

This study reports a case of a heterosexual male who was not psychotic and expressed a wish for a homosexual orientation. The psychodynamics of this patient are discussed, and the classification of ego-dystonic states discussed. It is concluded that DSM-III diagnoses should reflect underlying psychological disorders rather than sexual orientation.

Adult↗