An Innovative Approach to Promote Weight Loss Among Mexican Immigrants: A Pilot Study

Mexican Americans are among the highest risk groups for obesity and its associated health consequences, including diabetes, heart disease, and cancer. 154 overweight/obese Mexican Americans recruited from the Mexican Consulate in New York City were enrolled in COMIDA (Consumo de Opciones Más Ideales De Alimentos) (Eating More Ideal Food Options), a 12-week Spanish-language lifestyle intervention that included a dietary counseling session, weight-loss resources, and thrice-weekly text messages. Participants' weight (primary outcome); dietary intake, physical activity, and nutrition knowledge (secondary outcomes) were assessed pre- and post-intervention. Of the 109 who completed follow-up, 28% lost ≥ 5% of their baseline body weight. Post-intervention, participants consumed more fruit and less soda, sweet pastries, fried foods and red meat; increased physical activity; and evidenced greater nutrition knowledge. A community-based lifestyle intervention with automated components such as text messaging may be a scalable, cost-effective approach to address overweight/obesity among underserved populations.

The Association of Untreated Mental Health Problems with Alcohol and Tobacco use Among New York City Taxi Drivers

OBJECTIVES

Mental disorders and substance use disorders are highly comorbid. The "self-medication hypothesis" posits that individuals may use substances such as tobacco and alcohol to cope with symptoms associated with untreated mental health problems. The present study examined the association between having a currently untreated mental health condition and tobacco and alcohol use among male taxi drivers in NYC, a population at risk for poor mental and physical health outcomes.

METHODS

The sample included 1105 male, ethnoracially diverse, primarily foreign-born NYC taxi drivers participating in a health fair program. This secondary cross-sectional analysis utilized logistic regression modeling to examine whether endorsement of a currently untreated mental health problem (i.e., depression, anxiety, or posttraumatic stress disorder) was associated with alcohol and/or tobacco use, controlling for potential confounders.

RESULTS

8.5% of drivers reported having mental health problems; among these, only 0.5% reported receiving treatment. Untreated mental health problems were associated with an increased risk of current tobacco/alcohol use after controlling for age, educational attainment, nativity, and pain history: drivers with untreated mental health problems had 1.9x the odds of reporting current tobacco use [95% CI: 1.10-3.19] and 1.6x the odds of reporting current alcohol use [95% CI: 1.01-2.46] than those without untreated mental health problems.

CONCLUSIONS

Few drivers with mental health problems receive treatment. In line with the self-medication hypothesis, drivers with untreated mental health problems demonstrated significantly increased risk of tobacco and alcohol use. Efforts to encourage timely screening and treatment of mental health problems among taxi drivers are warranted.

Refinement of a Meaning-Centered Counseling Program for Chinese Patients with Advanced Cancer: Integrating Cultural Adaptation and Implementation Science Approaches

Background: This mixed methods study identified needed refinements to a telehealth-delivered cultural and linguistic adaptation of Meaning-Centered Psychotherapy for Chinese patients with advanced cancer (MCP-Ch) to enhance acceptability, comprehensibility, and implementation of the intervention in usual care settings, guided by the Ecological Validity Model (EVM) and the Practical, Robust Implementation and Sustainability Model (PRISM). Methods: 15 purposively sampled mental health professionals who work with Chinese cancer patients completed surveys providing Likert-scale ratings on acceptability and comprehensibility of MCP-Ch content (guided by the EVM) and pre-implementation factors (guided by PRISM), followed by semi-structured interviews. Survey data were descriptively summarized and linked to qualitative interview data. Three analysts independently coded the transcripts according to EVM and PRISM domains; discrepancies were resolved through discussion and consensus. Results: Quantitative findings showed high appropriateness and relevance of MCP-Ch across five EVM domains of Language, Metaphors/Stories, Goals, Content, and Concepts. Qualitative analysis yielded 23 inductive codes under the seven EVM domains: (1) Language (3 subcodes), (2) Persons (2 subcodes), (3) Metaphors/Stories (2 subcodes), (4) Methods (8 subcodes), (5) Content (2 subcodes), (6) Goals (4 subcodes), and (7) Concepts (2 subcodes). Themes based on PRISM included (1) Intervention characteristics (organizational perspective, 7 subcodes; and patient perspective, 6 subcodes) (2) External environment (2 subcodes), (3) Implementation and sustainability infrastructure (4 subcodes), and (4) Recipients (organizational characteristics, 5 subcodes; and patient characteristics, 4 subcodes). Conclusion: Recommendations for next steps include increasing the MCP-Ch protocol's flexibility and adaptability to allow interventionists to flexibly tailor MCP-Ch material to meet patients' individual needs, simplifying content to improve comprehension and acceptability, providing additional training to Chinese-serving providers to increase adoption and sustainability, and considering interpreter-assisted delivery to increase access. Findings yielded important information to maximize cultural relevance as well as the implementation and sustainability potential of MCP-Ch in real-world settings.

A systematic review and meta-analysis of psychosocial interventions for immigrant and limited English proficient cancer patients

OBJECTIVE

Immigrants, particularly those who are less acculturated and limited English proficient (LEP), often lack access to culturally and linguistically appropriate psychosocial care in cancer survivorship. We sought to determine what psychosocial interventions are available for immigrant and/or LEP cancer patients and to assess treatment and patient factors that may correlate with better psychosocial outcomes for this population.

METHODS

We conducted a systematic review and meta-analysis of studies published through August 2022 of interventions conducted with immigrant and/or LEP cancer patients aimed at improving psychosocial outcomes (i.e., quality of life, depression, cancer-related distress, and anxiety). Using Covidence, a software program for systematic review management, four independent raters screened 16,123 records with a systematic process for reconciling disagreement, yielding 48 articles (45 studies) for systematic review and 21 studies for meta-analysis.

RESULTS

Most studies were conducted with Spanish-speaking patients with breast cancer. Study participants (N = 5400) were primarily middle-aged (mean = 53 years old), female (90.0%), and Hispanic (67.0%). The weighted average effect size (g) across studies was 0.14 (95% CI 0.03-0.26) for quality of life (18 studies), 0.04 (95% CI -0.08 to 0.17) for depression (8 studies), 0.14 (95% CI -0.03 to 0.31) for cancer-related distress (6 studies), and 0.03 (95% CI -0.11 to 0.16) for anxiety (5 studies).

CONCLUSION

The interventions under review had small but beneficial effects on psychosocial outcomes for immigrant and LEP cancer patients. Notably, effect sizes were smaller than those found in previous meta-analyses of psychosocial interventions conducted in majority U.S.-born, non-Hispanic White, English-speaking cancer patient samples. More research is needed to identify key components and adaptations of interventions that benefit immigrant and LEP cancer patients to strengthen their effects for this growing yet underserved population.

Racial microaggressions and major discriminatory events explain ethnoracial differences in psychotic experiences

Few empirical studies have examined whether exposure to major racial discrimination explains ethnoracial disparities in psychosis outcomes and none to our knowledge have done so in the U.S. or have examined the role of other forms of racism such as racial microaggressions. The present study examined ethnoracial differences in self-reported psychotic experiences (PE) among 955 college students in an urban environment in the Northeastern U.S., and the degree to which major experiences of racial discrimination and racial microaggressions explains ethnoracial differences in PE. Mean scores on self-report inventories of PE and distressing PE (i.e., Prodromal Questionnaire (PQ)), major experiences of racial discrimination (EOD), and racial and ethnic microaggressions (REMS) were compared across 4 ethnoracial groups (White, Black, Asian, and Latina/o). Results from parallel mediation linear regression models adjusted for immigrant status, age, gender, and family poverty using the Hayes PROCESS application indicated ethnoracial differences in PE were explained independently by both forms of racism. Specifically, Black young people reported higher mean levels of PE, and distressing PE than both White and Latina/o people and the difference in PE between Black and White and Black and Latino/a young people was significantly explained by both greater exposure to racial microaggressions and major racial discriminatory experiences among Black people. This study re-emphasizes the explanatory role of racism, in its multiple forms, for psychosis risk among Black young populations in the US. Anti-racism interventions at both structural and interpersonal levels are necessary components of public health efforts to improve mental health in Black populations.

Cultural adaptation process of cancer-related interventions: A step-by-step guide

INTRODUCTION

To contribute to the reduction and elimination of cancer-related local and global health disparities, interventions must be culturally adapted to reach diverse cultural groups and demonstrate success in improving clinical and psychosocial outcomes. We provide step-by-step information on the conceptual and methodological challenges involved in culturally adapting interventions and provide guidelines, suggestions, tools, and concrete steps for implementing the process.

METHODS

This article provides information, guidelines, suggestions, tools, and concrete steps, based on three rigorous models of cultural adaptations, for implementing this process, followed with examples from the field, to illustrate the conceptual and methodological challenges involved in culturally adapting interventions.

CONCLUSION

Our systematic step-by-step approach recommends (1) the guidance of well-established research models; (2) use of multiple data sources and input from various stakeholders (i.e., from patients and providers); (3) qualitative and quantitative data usage and integration; (4) a steering committee with multiple perspectives, stakeholders assessments, and qualitative analyses; (5) consensus meetings; and (6) diverse representation on the steering committee and/or research team.

A Pilot Group-Based Lifestyle Intervention to Promote Weight Loss Among Mexican Immigrants

Mexican Americans are at increased risk for obesity upon immigration to the U.S., increasing their risk for diabetes, cardiovascular disease, and cancer. Our pilot individual lifestyle intervention culturally tailored for Mexican Americans, COMIDA (Consumo de Opciones Más Ideales De Alimentos) (Eating More Ideal Food Options), showed promising results. This paper presents outcomes from the group-based version of COMIDA. 129 overweight/obese Mexican Americans were enrolled in 'Group COMIDA'. Participants' weight (primary outcome), dietary intake and nutrition knowledge (secondary outcomes) were assessed pre- and post-intervention. Seventeen percent of participants experienced 5% weight loss at follow-up. Post-intervention, participants consumed more fruit and vegetables and fewer sweets and fried foods. A group-based, culturally adapted lifestyle intervention may be a more cost-effective approach than individual interventions to improve dietary behavior among underserved populations, though additional modifications may be considered to increase the intervention's effectiveness in promoting significant weight loss.

Social determinants and health-related quality of life in a sample of diverse, low socioeconomic status cancer patients

OBJECTIVES

In the United States, medically underserved populations, such as ethnoracially underrepresented groups, the limited English proficient (LEP), and the unemployed, may be vulnerable to poor functioning in cancer survivorship. The present study examined whether race/ethnicity, LEP status, and unemployment status were associated with poor health-related quality of life (HRQL) in four domains (physical, social, emotional, and functional well-being (FWB)) in a diverse, low socioeconomic status (SES) sample of cancer patients.

METHODS

The sample included 1592 ethnoracially diverse, low SES, primarily foreign-born adult oncology patients participating in an enhanced patient navigation program in 11 New York City hospital-based cancer clinics. This secondary cross-sectional analysis of program intake data examined bivariate associations between sociodemographic and clinical factors and poor HRQL (Functional Assessment of Cancer Therapy-General scores ≤70). Factors found to be related to poor HRQL (at p < 0.05) were entered into logistic regressions with overall HRQL and the four HRQL subscales as outcomes. The Benjamini-Hochberg Procedure controlled for potentially inflated type-I error rate due to multiple comparisons.

RESULTS

All three predictor variables (race/ethnicity, LEP status, and unemployment status) were significantly associated with increased odds of reporting poor FWB. Specifically, non-Hispanic White and Hispanic cancer patients had 2.7 and 1.5 times the odds of reporting poor FWB than non-Hispanic Black patients. The unemployed had 1.4 times the odds of reporting poor FWB than their employed or retired counterparts. Limited EP patients had 1.4 times the odds of reporting poor FWB than EP participants. Non-Hispanic Black patients evidenced significantly lower odds of reporting poor HRQL across all subscale domains compared with other ethnoracial groups.

CONCLUSIONS

LEP and unemployed individuals were more likely to report poor FWB, which may indicate that the most marginalized cancer patients face significant barriers to adequate functioning. Interventions that promote functional abilities (i.e., activities of daily living, self-care, and work retention) and policies and programs that reduce systemic inequality and address social determinants of health may aid in improving HRQL for these underserved groups in survivorship. Non-Hispanic Black cancer patients were less likely than other groups to report poor physical, social, emotional, and FWB. Identifying protective factors in this group may aid in efforts to improve HRQL for all patients.

Psychotic experiences among Black college students in the United States: The role of socioeconomic factors and discrimination

BACKGROUND

Psychosis is more prevalent among Black individuals compared with White individuals. However, it is unknown whether this disparity exists among college populations in the United States, and if so, what factors contribute to the disparity.

METHODS

We analyzed data from Black and White young adult students using the Health Minds Study (2020-2021), which is a survey administered at 140 colleges in the U.S. Using mediation analysis, we examined the extent to which the relation between race and psychotic experiences was mediated by socioeconomic factors (past and current financial distress, food insecurity, parental education) and discrimination.

RESULTS

Approximately 38 % of Black students and 30 % of White students reported lifetime psychotic experiences. Including all socioeconomic factors together in the same model accounted for just over half (50.2 %) the association between race and psychotic experiences. We then conducted additional analyses examining discrimination, all the socioeconomic factors plus discrimination accounted for 81.5 % of the association between race and psychotic experiences. When disentangling the mediators, food insecurity and discrimination accounted for the largest percentages of the association. The effects of past financial distress and parental education were modified by race.

CONCLUSION

Black college students were more likely to report lifetime psychotic experiences than their White counterparts. Moreover, socioeconomic factors and discrimination made significant contributions to this racial difference.

Latent class analysis of racial microaggressions and institution-specific racial discrimination at a U.S. minority-serving university: Implications for mental health and coping

Research has demonstrated that ethnoracially minoritized college students face negative mental health outcomes associated with racism. However, little is known about the intersections between microaggressions and institution-specific racial discrimination, their relationship with psychological distress, and the role of coping in this relationship. An ethnoracially diverse sample of 915 young adults attending an urban minority-serving institution (MSI) completed self-report measures on sociodemographics, microaggressions and institution-specific racial discrimination, coping, anxiety and depression, and perceived stress. Latent class analysis (LCA) determined the number and nature of classes for both forms of racism. Hierarchical linear regressions assessed the association between the LCA classes and anxiety/depression and examined the moderating role of coping in said association. The LCA revealed two classes: "exoticization and environmental microaggressions" (EM), whose members reported experiencing these two types of microaggressions, and "institution-specific racial discrimination and microaggressions" (IRM), whose members reported both institution-specific racial discrimination and microaggressions in multiple domains. Belonging to the IRM group was associated with depression but not anxiety after adjusting for perceived stress. Black students and those reporting lower family income were more likely to belong to the IRM group. Coping moderated the relation between IRM group membership and depression, which was weaker for those who reported active coping in response to racism. College students from MSIs who experience both institution-specific racial discrimination and microaggressions may be at greater risk for depression than those who experience exoticization and environmental microaggressions alone. Active coping may ameliorate depression risk. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Primary Care Providers' Knowledge, Attitudes, Beliefs, and Practice Related to Lung Cancer Screening in Five High-Risk Communities in New York City

Racial/ethnic minorities face stark inequalities in lung cancer incidence, treatment, survival, and mortality compared with US born non-Hispanic Whites. Lung cancer screening (LCS) with low-dose computed tomography (LDCT) is effective at reducing lung cancer mortality in high-risk current and former smokers and is recommended by the US Preventive Services Task Force (USPSTF). This study sought to assess primary care providers' (PCPs') knowledge, attitudes, beliefs, and practice related to LCS and the recent USPSTF guidelines in five high-risk immigrant communities in New York City. We surveyed 83 eligible PCPs between December 2016 and January 2018 through surveys sent by mail, email, and fax, administered by phone or in person. The survey included questions about providers' clinical practice, knowledge, attitudes, and beliefs related to LCS and the USPSTF guidelines. Information about patient demographics, PCPs' training background, and practice type were also collected. Sixty-seven percent of respondents reported that they did not have established guidelines for LCS at their practice, and 52% expressed that "vague" screening criteria influenced their referral processes for LCS. Barriers to LCS with LDCT included concerns that LDCT is not covered by insurance, patients' fears of screening results, and patients' concerns regarding radiation exposure. Targeted educational interventions for both PCPs and patients may increase access to recommended LCS, especially for populations at disproportionate risk for lung cancer.

Institutional Ethnoracial Discrimination and Microaggressions among a Diverse Sample of Undergraduates at a Minority-Serving University: A Gendered Racism Approach

Purpose

Ethnoracial minorities report a variety of discriminatory experiences due to systemic racism. Yet, few studies have examined whether gender and race/ethnicity interact to predict institutional discrimination and racial microaggressions through an intersectional approach.

Design/methodology/approach

A predominantly female (60%), ethnoracial minority (20.8% Black, 31.6% Asian, 30.8% Latina/o, 8.2% White, 6.6% Middle Eastern) sample of 895 undergraduates attending a minority-serving public university in an urban setting completed self-report measures of sociodemographic characteristics, experiences of racial microaggressions, and institutional discrimination.

Findings

Significant (p<.05) gender × race/ethnicity interaction effects were found in several institutional discrimination domains: Males reported more police/court discrimination overall, but gender differences in police/court discrimination were less pronounced for non-Black vs. Black students. While males tended to report more institutional discrimination than females, the reverse was true for the Middle Eastern group: Middle Eastern females reported institutional discrimination in more domains and more discrimination getting hired than their male counterparts. There was a significant race/ethnicity × gender interaction effect for environmental microaggressions: White males reported more environmental microaggressions than White females, but gender differences were not found in the overall sample.

Originality

This study is the first to our knowledge to assess the interactive effects of gender and ethnicity on the type of microaggressions experienced in a diverse sample that includes individuals of Middle Eastern descent. The authors highlight the range of discriminatory events that ethnoracially minoritized undergraduates experience, even at a minority-serving institution.

Healthcare Professionals' Perspectives on Adapting a Community Health Worker Model to Facilitate Lung Cancer Screening for Chinese For-Hire Vehicle Drivers

Chinese immigrant for-hire vehicle (FHV) drivers who smoke or smoked are at high risk for lung cancer due to the combined impact of tobacco use and air pollution exposure yet underutilize lung cancer screening (LCS). Community Health Worker (CHW) programs have been effective at improving cancer screening rates. This study describes a community needs assessment to inform the adaptation of an existing CHW intervention to facilitate LCS among Chinese FHV drivers. Interviews were conducted until saturation with 13 Chinese-serving health professionals to determine the community's needs, priorities, and preferences. Transcripts were qualitatively analyzed using Atlas.ti. Seven frequently occurring themes were identified: knowledge of guidelines/access to LCS, acceptability of CHW program, CHW role in screening process, qualities of an ideal CHW, barriers to LCS, challenges to implementing a CHW program, and adaptations to CHW program. The adapted CHW intervention should include culturally tailored health education to increase LCS knowledge for patients and providers.

Developing a Culturally Responsive Lifestyle Intervention for Overweight/Obese U.S. Mexicans

INTRODUCTION

Hispanics are the largest minority group in the United States, constituting 18 % of the population. Mexicans are the largest Hispanic subgroup and are at disproportionate risk for overweight/obesity. Lifestyle interventions targeting dietary change and physical activity have resulted in significant weight loss in several large randomized clinical trials in the general population, but few studies have tailored interventions to Mexican Americans. We conducted a community needs assessment from 2018 to 2020 in accordance with Domenech-Rodriguez and Wieling's Cultural Adaptation Process (CAP) model to inform the development of SANOS (SAlud y Nutrición para todOS) (Health and Nutrition for All), a culturally-tailored, community-based diet and lifestyle education and counseling program that addresses overweight/obesity among U.S. Mexicans.

METHODS

Five Spanish-language focus groups were conducted until thematic saturation with 31 overweight/obese Mexicans in New York City about their knowledge, priorities, and preferences regarding diet, exercise, and evidence-based strategies for behavioral change. A grounded theory approach was used to analyze the data.

RESULTS

Five themes were identified: (1) A strong desire for tangible information related to diet and health, (2) Family as a primary motivator for behavior change, (3) Desire for group-based motivation and accountability to sustain intervention participation, (4) Belief in short-term goal setting to prevent loss of motivation, and (5) Time and workplace-related barriers to intervention adoption.

CONCLUSIONS

Ecological factors such as the effect of acculturation on diet, family members' role in behavior change, and socioenvironmental barriers to healthy dietary practices and physical activity should be considered when adapting evidence-based treatments for Mexican Americans.

Chinese Livery Drivers' Perspectives on Adapting a Community Health Worker Intervention to Facilitate Lung Cancer Screening

Chinese immigrant livery drivers with a smoking history are at high risk for lung cancer. A culturally adapted community health worker (CHW) program may be an effective approach to increase lung cancer screening (LCS) uptake in this underserved group. Five focus groups were conducted with 39 Chinese immigrant male livery drivers with a smoking history in New York City to assess their needs, priorities, and preferences regarding the proposed intervention. Transcripts were qualitatively analyzed using Atlas. ti. Focus group participants were uncertain about whether smoking was associated with cancer, unfamiliar with LCS, and reported numerous barriers to LCS uptake. Most believed a CHW program to facilitate LCS would be acceptable and feasible, if tailored to meet their needs. Our results have implications for improving access to early detection of lung cancer and preventive care (e.g., culturally appropriate smoking cessation and health education programs) for Chinese livery drivers.

A Case Study in Academic-Community Partnerships: A Community-Based Nutrition Education Program for Mexican Immigrants

Hispanics are the largest U.S. immigrant group and Mexican Americans are the largest U.S. Hispanic population. Hispanics, particularly Mexican Americans, are among the highest risk groups for obesity, placing them at increased risk for cardiovascular disease and certain types of cancer. Obesity lifestyle interventions incorporating Motivational Interviewing techniques and specific adaptations for the population of interest can have a significant impact on reducing health risks. This paper presents a community-engaged, culturally-sensitive nutrition and dietary counseling intervention conducted between 2016 and 2018 at the Consulate General of Mexico in New York City and reports preliminary findings regarding participant satisfaction and self-reported changes in eating and exercise habits. In addition, it describes the community and academic partners' roles and processes in program development, discusses strengths and challenges posed by a multi-sector partnership and describes adaptations made using the Behavioral Model for Vulnerable Populations to increase the program's sustainability and potential for scalability.

Changes in perceived neighborhood ethnic density among racial and ethnic minorities over time and psychotic-like experiences

BACKGROUND

Research primarily conducted in Europe find high neighborhood ethnic density (i.e., proportion of own ethnic group) lessens risk of psychotic symptoms among racial and ethnic minorities; however, most studies measure ethnic density through crude demarcations in geographic data only at illness onset which may miss meaningful variation from the perspective of residents. The present study is the first in the U.S. to examine whether changes in perceived ethnic density from childhood are associated with psychotic-like experiences (PLE).

METHODS

A Northeastern U.S. urban undergraduate sample of 1330 racial and ethnic minorities completed a self-report inventory of PLE, the Prodromal Questionnaire, and indicated their racial and ethnic neighborhood composition before and after age 12. One way analyses of covariance (ANCOVA) adjusted for age, family poverty, racial and ethnic group, immigrant status, and lifetime cannabis use, compared PLE across ethnic density categories and change.

RESULTS

Racial and ethnic minorities who grew up in a neighborhood (before age 12) predominantly inhabited by a different group of color (e.g., being Black in a predominantly Asian neighborhood) endorsed significantly more PLE than those who grew up in racially concordant, mixed, or predominantly White neighborhoods. In addition, those reporting a change in perceived neighborhood ethnic density after age 12 endorsed significantly more PLE than those reporting no change.

CONCLUSION

Racial dynamics among people of color in urban neighborhood U.S. contexts may create psychological challenges in the social environment. The developmental timing of demographic changes in neighborhoods may influence stress processes that enhance risk for PLE.

Patient perspectives on adapting meaning-centered psychotherapy in advanced cancer for the Chinese immigrant population

The Chinese immigrant community faces multiple obstacles to effective cancer support and psychosocial care post diagnosis. Meaning-centered psychotherapy (MCP) is an empirically based treatment (EBT) that has been found to significantly reduce psychological distress while increasing spiritual well-being and a sense of meaning and purpose in life in patients with advanced cancer. However, it has not yet been adapted for Chinese immigrants who have unique linguistic and cultural needs. This study presents a community needs assessment to inform the cultural adaptation of MCP for Chinese patients with advanced cancer using Bernal et al.'s ecological validity model and the cultural adaptation process model of Domenech-Rodriquez and Weiling. Interviews were conducted until saturation with 12 Chinese immigrants with advanced cancer to determine the community's needs and preferences regarding the MCP intervention. Transcripts were translated and analyzed using Atlas.ti and six frequently occurring themes were identified: Coping; End of Life; Family; Culture, Religion, and Language; Immigration; and Specific Adaptations to MCP. Sociocultural values, beliefs, and practices such as filial piety and the use of Traditional Chinese Medicine (TCM) should be considered when adapting EBTs for Chinese immigrant cancer patients.

Ethnic identity, racial discrimination and attenuated psychotic symptoms in an urban population of emerging adults

AIM

Studies suggest strong ethnic identity generally protects against negative mental health outcomes associated with racial discrimination. In light of evidence suggesting racial discrimination may enhance psychosis risk in racial and ethnic minority (REM) populations, the present study explored the relationship between ethnic identity and attenuated positive psychotic symptoms (APPS) and whether ethnic identity moderates the association between racial discrimination and these symptoms.

METHODS

A sample of 644 non-help-seeking REM emerging adults was administered self-report inventories for psychosis risk, experiences of discrimination and ethnic identity. Latent class analysis was applied to determine the nature and number of ethnic identity types in this population. The direct association between ethnic identity and APPS and the interaction between ethnic identity and racial discrimination on APPS were determined in linear regression analyses.

RESULTS

Results indicated three ethnic identity classes (very low, moderate to high and very high). Ethnic identity was not directly related to APPS; however, it was related to APPS under racially discriminating conditions. Specifically, participants who experienced discrimination in the moderate to high or very high ethnic identity classes reported fewer symptoms than participants who experienced discrimination in the very low ethnic identity class.

CONCLUSIONS

Strong ethnic group affiliation and connection may serve a protective function for psychosis risk in racially discriminating environments and contexts among REM young adults. The possible social benefits of strong ethnic identification among REM youth who face racial discrimination should be explored further in clinical high-risk studies.

Ethnic Identity and Perceived Stress Among Ethnically Diverse Immigrants

Recent empirical research suggests that having a strong ethnic identity may be associated with reduced perceived stress. However, the relationship between perceived stress and ethnic identity has not been tested in a large and ethnically diverse sample of immigrants. This study utilized a multi-group latent class analysis of ethnic identity on a sample of first and second generation immigrants (N = 1603), to determine ethnic identity classifications, and their relation to perceived stress. A 4-class ethnic identity structure best fit the data for this immigrant sample, and the proportion within each class varied by ethnicity, but not immigrant generation. High ethnic identity was found to be protective against perceived stress, and this finding was invariant across ethnicity. This study extends the findings of previous research on the protective effect of ethnic identity against perceived stress to immigrant populations of diverse ethnic origins.

Ethnic variation in whether dissociation mediates the relation between traumatic life events and attenuated positive psychotic symptoms

The present study sought to determine whether dissociative experiences mediated the relationship between traumatic life events and attenuated positive psychotic symptoms in a non-treatment-seeking sample of racial and ethnic minority young adults. Participants (n = 549) completed a self-report inventory for psychosis risk (i.e., the Prodromal Questionnaire; R. L. Loewy, C. E. Bearden, J. K. Johnson, A. Raine, & T. D. Cannon, 2005), from which a total number of attenuated positive psychotic symptoms was assessed. Participants also completed a checklist of potentially traumatic life events and a traumatic dissociation scale. Hierarchical linear regression models and bootstrapping results indicated that dissociation mediated the relationship between traumatic life events and attenuated positive psychotic symptoms. Stratified analyses of Black, Asian, and Hispanic subgroups revealed that full mediation was only evident in the Black subgroup of young adults. Partial mediation was found among the Hispanic group, and no mediation occurred in the Asian subgroup. For the latter, traumatic life events were not significantly associated with dissociative experiences. A dissociative response style may be particularly relevant to trauma-exposed Black young adults exhibiting subclinical psychotic experiences and less so for Asian young adults. Trauma-induced dissociative experiences should be assessed further in clinical high-risk studies, especially among Black traumatized youth.

Functional impairment of the rat superior colliculus after kainic acid intraocular injection: A 2-Deoxyglucose study

Long Evans rats monocularly injected with the kainic acid (KA), were exposed to "tonic" (diffuse steady light, stationary pattern, total darkness) and "phasic" (flashing, moving pattern) stimulations. By means of the autoradiographic 2-deoxyglucose (2DG) technique we assessed the functional activity of the Superior Colliculus (SC) contralateral to the injected eye as compared to the normal eye SC. In the control SC all "tonic" stimulations determined low 2DG uptake not modified by the intraocular KA injection. On the contrary, "phasic" stimulations elicited a strong 2DG consumption in the normal SC, with a peculiar pattern of distribution depending on the kind of stimulus. Considering the total 2DG uptake as the added intrinsic and afferent metabolism, KA was able to affect only the latter, decreasing two-fold that expected for the afferent input loss. These findings can suggest a possible KA effect on off-line ganglion cells and, on the other side, they confirm the role of the SC in discriminating "phasic" and sudden phenomena from "tonic" and continuous ones.

Lower uterine segment involvement as a predictor for lymph node spread in endometrial carcinoma

OBJECTIVES

Several predictive factors for lymph node spread in endometrial cancer have been identified including tumor grade, depth of invasion, lymphatic or vascular-space invasion, and histologic subtype. Lower uterine segment involvement may also be predictive of lymph node spread. The objective of this study was to investigate the relationship between lower uterine segment involvement in endometrial carcinoma and lymph node spread.

METHODS

This was an IRB approved retrospective study. Data were collected for all patients diagnosed with endometrial cancer from June 1999 to December 2004. The primary end point was the presence of nodal involvement. Subset analysis was performed by histologic subtype. Univariate and multivariate nominal logistic regression was performed. Categorical variables were compared using Chi-square and Fischer's Exact Test.

RESULTS

Two-hundred and ninety-nine subjects were eligible for review. One-hundred seventy four (58%) had lower uterine segment involvement. Forty-four (25%) of those with lower uterine segment involvement had positive nodes compared to 10 (8%) of those without (p=0.0001). On univariate analysis, lower uterine segment involvement, lymphovascular-space invasion, and deep invasion predicted nodal disease. On multivariate analysis, lower uterine segment remained predictive of nodal spread for the endometrioid subset. For high-risk histologies, only lymphovascular-space invasion and deep myometrial invasion were predictive of nodal spread.

CONCLUSIONS

Lower uterine segment involvement in endometrial carcinoma is an important predictor of lymph node involvement for patients with endometrioid histologies. Tumor within the lower uterine segment may be an important factor to consider in intraoperative decision making regarding staging.

Effects of ketamine anesthesia on central nociceptive processing in the rat: a 2-deoxyglucose study

Ketamine is a dissociative anesthetic with complex actions on the CNS. We investigated here the effects of ketamine anesthesia on somatosensory processing in the rat spinal cord, thalamus, and cerebral cortex, using the quantitative 2-deoxyglucose mapping technique. Unanesthetized or ketamine-anesthetized male Sprague-Dawley rats received a s.c. injection of a dilute formaldehyde solution (5%, 0.08 ml) into a forepaw, inducing prolonged noxious afferent input, or an equal volume of isotonic saline as a control stimulus. The 2-deoxyglucose experiments started 30 min after the injection. In the cervical enlargement of the spinal cord, ketamine had no significant effect on glucose metabolic rates in saline-injected animals, whereas it prevented the metabolic increases elicited by prolonged noxious stimulation in unanesthetized animals. At the thalamic level, ketamine increased glucose uptake in both saline- and formalin-injected rats in the lateral posterior, lateral dorsal, medial dorsal, gelatinosus, antero-ventral and antero-medial thalamic nuclei, whereas it decreased metabolic activity in the ventro-basal complex. At the cortical level, the drug increased metabolic activity in both control and formalin groups in the lacunosus-molecularis layer of the dorsal hippocampus, posterior parietal, retrosplenial, cingulate and frontal cortex; significant metabolic decreases were found in the CA1 region of the dorsal hippocampus and in the parietal 1 and 2 cortical areas. In the investigated brain regions, ketamine did not abolish noxious-evoked increases in glucose uptake, which were in fact enhanced in the forelimb cortex and in the lacunosus-molecularis layer of the hippocampus. The dissociation between the spinal and supraspinal effects of ketamine suggests a specific antinociceptive action on spinal circuits, in parallel with complex changes of the activity of brain circuits involved in somatosensory processing. More generally, this study shows that functional imaging techniques are able to quantitatively assess the effects of anesthetic drugs on nociceptive processing at different levels of the neuraxis.

Saccadic eye movements are impaired in Duchenne muscular dystrophy

Extraocular muscles are generally considered to be spared in Duchenne Muscular Dystrophy (DMD). However, this assumption is based mainly on clinical observations, as systematic eye movement recordings have been performed in a very limited number of cases. Our goal was to analyze several saccade parameters in a higher number of cases, in order to reveal a possible ocular-motor impairment in DMD. Data were collected from a population of 9 subjects with DMD and 9 healthy male subjects of comparable age as controls. We used the electrooculographic (EOG) technique coupled with advanced digital signal processing; saccade duration, amplitude, mean velocity, peak velocity and K factor (ratio mean/peak velocity) were measured. The DMD group showed saccades with significantly longer duration and lower velocity, with respect to controls; these differences were accounted for mainly by the largest movements, whereas there were no significant differences at the smallest eccentricity tested (3 deg). Neither amplitude nor K factor were significantly different from controls for any of the eccentricities tested. To our knowledge. this is the first study to suggest significant impairment of eye movements in Duchenne muscular dystrophy.

Cortical and subcortical afferents to the nucleus reticularis tegmenti pontis and basal pontine nuclei in the macaque monkey

Anatomical findings are presented that identify cortical and subcortical sources of afferents to the nucleus reticularis tegmenti pontis (NRTP) and basal pontine nuclei. Projections from the middle temporal visual area (MT), medial superior temporal visual area (MST), lateral intraparietal area (LIP), and areas 7a and 7b to the basal pontine nuclei were studied using 3H-leucine autoradiography. The results complemented a parallel study of retrograde neuronal labeling attributable to injecting WGA-HRP into NRTP and neighboring pontine nuclei. Small 3H-leucine injections confined to MT, MST, LIP, area 7a, or area 7b, produced multiple patches of pontine terminal label distributed as follows: (1) An injection within MT produced terminal label limited to the dorsolateral and lateral pontine nuclei. (2) Injections restricted to MST or LIP showed patches of terminal label in the dorsal, dorsolateral, lateral, and peduncular pontine nuclei. (3) Area 7a targets the dorsal, dorsolateral, lateral, peduncular, and ventral pontine nuclei, whereas area 7b projects, additionally, to the dorsomedial and paramedian pontine nuclei. Notably, no projections were seen to NRTP from any of these cortical areas. In contrast, injections made by other investigators into cortical areas anterior to the central sulcus revealed cerebrocortical afferents to NRTP, in addition to nuclei of the basal pontine gray. With our pontine WGA-HRP injections, retrograde neuronal labeling was observed over a large extent of the frontal cortex continuing onto the medial surface which included the lining of the cingulate sulcus and cingulate gyrus. Significant subcortical sources for afferents to the NRTP and basal pontine nuclei were the zona incerta, ventral mesencephalic tegmentum, dorsomedial hypothalamic area, rostral interstitial nucleus of the medial longitudinal fasciculus, red nucleus, and subthalamic nucleus. The combined anterograde and retrograde labeling data indicated that visuo-motor cortico-pontine pathways arising from parietal cortices target only the basal pontine gray, whereas the NRTP, together with select pontine nuclei, is a recipient of afferents from frontal cortical areas. The present findings implicate the existence of parallel direct and indirect cortico-pontine pathways from frontal motor-related cortices to NRTP and neighboring pontine nuclei.

The fetal cleft palate: II. Scarless healing after in utero repair of a congenital model

The role of fetal surgery in the treatment of non-life-threatening congenital anomalies remains a source of much debate. Before such undertakings can be justified, models must be established that closely resemble the respective human anomalies, and the feasibility and safety of these in utero procedures must be demonstrated. The authors recently described and characterized a congenital model of cleft palate in the goat. The present work demonstrates the methodology they developed to successfully repair these congenital cleft palates in utero, and it shows palatal healing and development after repair. A surgically created cleft model was developed for comparative purposes. Palatal shelf closure normally occurs at approximately day 38 of gestation in the caprine species. Six pregnant goats were gavaged twice daily during gestational days 32 to 41 (term, 145 days) with a plant slurry of Nicotiana glauca containing the piperidine alkaloid anabasine; the 12 fetuses had complete congenital clefts of the secondary palate. Repair of the congenital clefts was performed at 85 days of gestation using a modified von Langenbeck technique employing lateral relaxing incisions with elevation and midline approximation of full-thickness, bilateral, mucoperiosteal palatal flaps followed by single-layer closure. Six congenitally clefted fetuses underwent in utero repair, six remained as unrepaired controls. Twelve normal fetuses underwent surgical cleft creation by excision of a 20 x 3 mm full-thickness midline section of the secondary palate extending from the alveolus to the uvula, at 85 days of gestation. Six surgically clefted fetuses underwent concurrent repair of the cleft at that time; six clefted fetuses remained as unrepaired controls. At 2 weeks of age, no congenitally or surgically created clefts repaired in utero demonstrated gross or histologic evidence of scar formation. A slight indentation at the site of repair was the only remaining evidence of a cleft. At 6 months of age, normal palatal architecture, including that of mucosal, muscular, and glandular elements, was seen grossly and histologically. Cross-section through the mid-portion of the repaired congenitally clefted palates demonstrated reconstitution of a bilaminar palate, with distinct oral and nasal mucosal layers, after single-layer repair. In utero cleft palate repair is technically feasible and results in scarless healing of the mucoperiosteum and velum. The present work represents the first in utero repair of a congenital cleft palate model in any species. The use of a congenital cleft palate model that can be consistently reproduced with high predictability and little variation represents the ideal experimental situation. It provides an opportunity to manipulate specific variables, assess the influence of each change on the outcome and, subsequently, extrapolate such findings to the clinical arena with a greater degree of relevance.

Olivofloccular circuit in oculomotor control: binocular optokinetic stimulation

The metabolic activation of the olivocerebellar pathway during binocular optokinetic stimulation was studied in the guinea pig, by means of the semiquantitative 14C-2-deoxyglucose (2DG) technique. The experimental group underwent binocular horizontal stimulation, whereas the control animals were either kept in the dark or allowed to view a stationary pattern. The local metabolic activity index in the dorsal cap of the inferior olive was higher on the side contralateral to the eye that had been stimulated in the temporonasal (T-N) direction in the horizontal group; in contrast, the floccular region showed higher activity on the side ipsilateral to the T-N-stimulated eye. These findings support the involvement of the olivocerebellar pathway in the horizontal optokinetic response. A phylogenetic hypothesis is suggested to explain inconsistent results found in the literature.

The fetal cleft palate: I. Characterization of a congenital model

Any animal model of a human congenital anomaly established by iatrogenic methods involving intrauterine fetal manipulation has limited clinical applicability. A congenital model that more closely simulates the etiopathogenesis of a human anomaly may provide data that can more readily be extrapolated to that anomaly and, therefore, be used in diagnostic and management strategies. The present work provides a description and characterization of a congenital model of cleft palate in the goat. Palatal shelf closure normally occurs at approximately day 38 of gestation in the caprine species. Sixteen pregnant goats were gavaged twice daily during gestational days 32 through 41 [term, 145 days] with a plant slurry of Nicotiana glauca containing the piperidine alkaloid teratogen anabasine. Gross analysis and measurement of fetal clefts were performed at 60, 70, and 85 days gestation (four fetuses were studied at each time point). Seventeen clefted kids were sacrificed at specific intervals after birth (2 weeks, and 1, 3, and 6 months); after skull debridement and preparation, they were compared with 12 unclefted control kids. Complete clefting of the secondary palate occurred in 97 percent of the fetuses. In all cases, the cleft extended from the posterior aspect of the alveolar ridge to the uvula; the majority of these clefts were bilateral, with complete detachment of the vomer. Morphologically, these clefts were similar to human clefts. Eighteen percent of clefted newborn kids demonstrated gross maxillary hypoplasia and midfacial retrusion at birth with a relative Class III malocclusion. Direct measurement of the congenital caprine skulls confirmed these findings. The incidence of midfacial growth abnormalities in these clefted animals raises questions regarding the etiopathogenesis of facial dysmorphology that is unrelated to scarring of the maxilla. This congenital cleft palate model is currently being used to explore these questions and others related to craniofacial growth and palatal function after in utero repair.

[Analysis of renal function on 1,743 people of different ages]

OBJECTIVE

To understand and evaluate the currency and correlation between parameters about renal function.

METHODS

We divided 1,743 people whose ages vary from 20-85 years into six groups(A, B, C, D, E, F). Urinary Mini Albumin, RBP, NAG, osmotic pressure, serum BUN, plasma UA and internal creatinine clearance were measured as parameter about renal function.

RESULTS

There was no obvious difference between the Group A and Group B(P > 0.05); The mean value of urinary NAG and urinary RBP in the two group was 10.9650 +/- 6.5650 and 0.1885 +/- 0.4709; However, when they were compared with the values of C, D, E group respectively, there were prominent differences (P < 0.05 or P < 0.01). Urinary Alb value of Group A is quite different from other groups. No difference exists between urinary Alb value of Group E and Group F(P > 0.05). Internal creatinine clearance decrease by the rate of 8.5%, 17.8%, 29.9%, 42.9% and 56.3% when Groups B, C, D, E and F was compared with Group A; while urinary osmotic pressure and the value of plasma BUN, Cr and UA has no obvious difference between any two groups(P > 0.05).

CONCLUSION

The clearance of internal creatinine decrease with the growing of the age, especially older than 50 years of age. The parameter about tubular injury increase obviously after 40 years old though it does not change prominently before 50 years old, while it tends to be stable after 70 years old. We think it is during period of 40 to 70 years old that the renal function decreases more rapidly.

Neural circuits underlying ketamine-induced oculomotor behavior in the rat: 2-deoxyglucose studies

Time-related changes in oculomotor function and of metabolic activity patterns in selected brain networks, as assessed by the quantitative 2-deoxyglucose technique, were investigated in Long-Evans rats following intraperitoneal administration of a ketamine anesthetic dose. During ketamine-induced anesthesia a nystagmic-like behavior was present, characterized by uni-directional slow ocular drifts with superimposed paroxystic bursts of quick (saccadic-like) eye movements; all quick movements were executed in the horizontal direction, were strictly confined to an ocular hemifield of vision, and were followed by a backward (centripetal) drift. A metabolic hyperactivity was found in the dorso-medial shoulder region of the frontal cortex, corresponding to the rat saccadic cortical generator area, whereas functional activity levels were decreased in cerebellum and in several brainstem regions, including portions of the reticular formation and medial vestibular nuclei, putatively indicated as the locus of the oculomotor neural integrator. Starting 2 h after drug injection, a gradual recovery of oculomotor function occurred, with the disappearance of slow ocular drifts. However, an almost uninterrupted sequence of individual saccades was still present. Significant metabolic increases were found at this time in the cingulate and frontal cortex, basal ganglia, superior colliculus, paramedian reticular formation and oculomotor nuclei, the cerebellar vermis and paraflocculus. In medial vestibular nuclei, metabolic levels were undistinguishable from controls. These results suggest different concentration-dependent actions of ketamine on cortical and subcortical circuits involved in saccade generation and gaze holding. These effects are likely to be related at least in part to antagonism of N-methyl-D-aspartate receptor-mediated functions.

Neglect syndrome for aversive stimuli in a macaque monkey with dorsomedial frontal cortex lesion

After a session of unit activity recording, one of our monkeys presented an epileptic attack, which provoked contralateral tilting movements. The following days, the animal performed saccades and fixation tasks correctly in all directions, while contralateral arm reaching movements were severely impaired. To establish if the neurological lesion had changed the orienting performance we considered two types of stimuli, pleasant and aversive. Pleasant stimuli, presented in the ipsilateral or contralateral hemifield, readily drew the attention of the animal. If the same stimuli were presented simultaneously in both hemifields, the monkey oriented itself only toward the ipsilateral one. Aversive stimuli evoked an aggressive reaction only when the stimulus was localized in the ipsilateral hemifield. The animal clearly neglected the aversive stimulus presented in the contralateral hemifield. The animal recovered completely in 30 days. The postmortem examination revealed a lesion in the dorsomedial frontal cortex. The combined attentional and motor deficits suggest that this area may be involved in the preparation and execution of movements triggered by the affective meaning of the stimulus.

Visual corticopontine projections in the guinea pig: an autoradiographic study

The goal of this study is to characterize the anatomical organization of the visual cortical output to the basal pontine nuclei in the guinea pig. Data from the literature show that guinea pigs exhibit different optokinetic oculomotor behaviors with respect to rats and rabbits. Namely, they present a fast rise in eye movement velocity at stimulus onset and a better performance in monocular horizontal stimulation. Possible differences in the visual corticopontocerebellar pathway might explain these peculiarities. The pontine projections from the primary visual cortex were studied with the method of the anterograde axonal transport of [3H]leucine. The terminal labeling forms prominent patches, ipsilaterally to the cortical injection, throughout the rostrocaudal extent of the pontine nuclei, predominantly in the dorsolateral region. At the intermediate rostrocaudal level, some foci of labeling are found ventrolaterally as well. Sparse fields are present also in the medial pontine nuclei and in the nucleus reticularis tegmenti pontis, but only when the injection site extends to secondary visual areas, either lateral or medial. The present description of the corticopontine projections in guinea pigs is in substantial agreement with the projections previously described in rats, with a few differences, namely: (1) the recipient area extends more caudally; (2) secondary visual areas project to the nucleus reticularis tegmenti pontis.

Projections from visual areas of the cerebral cortex to pretectal nuclear complex, terminal accessory optic nuclei, and superior colliculus in macaque monkey

The purpose of this study was to analyze the projections from visually related areas of the cerebral cortex of rhesus monkey to subcortical nuclei involved in eye-movement control; i.e., the pretectal nuclear complex, the terminal nuclei of the accessory optic system (AOS), and the superior colliculus (SC). The anterograde tracer 3H-leucine was pressure injected bilaterally into the cortex of six monkeys (for a total of 12 cases) involving the primary visual cortex (area 17); the medial prestriate cortex (medial 18/19); dorsomedial area 19; the caudal portion of the cortex of the superior temporal sulcus, upper bank (cytoarchitectural area OAa) and lower bank (area PGa); the lower bank of the caudal lateral intraparietal sulcus (area POa); and the inferior parietal lobule (area 7). The results revealed that the pretectal nucleus of the optic tract received inputs from medial prestriate cortex, dorsomedial part of area 19, OAa, and PGa. The posterior pretectal nucleus received sparse projections from area 7 and the cortex lining the intraparietal sulcus (dorsomedial part of area 19 and POa). The pretectal olivary nucleus was targeted by neurons in cortex of dorsomedial area 19, and the anterior pretectal nucleus was targeted by neurons in both dorsomedial 19 and area 7. The nuclei of the AOS (dorsal terminal; lateral terminal; and interstitial nuclei of the superior fasciculus, posterior and medial fibers) received projections exclusively from areas OAa and PGa. Furthermore, in one case with PGa injection, the medial terminal nucleus, dorsal portion, was also labeled. The visual cortical areas studied projected differentially upon the SC laminae. The primary visual area 17 projected only to the superficial laminae, i.e., stratum zonale (SZ), stratum griseum superficiale (SGS), and stratum opticum (SO). On the other hand, the medial portion of the prestriate cortex and caudal OAa and PGa targeted the superficial and intermediate laminae, i.e., SZ, SGS, SO, and stratum griseum intermediale (SGI), whereas caudal area POa projected primarily to the intermediate layer SGI. Rostral area 7 (mainly 7b) neurons terminated in the stratum album intermediale (SAI); no SC terminals were found in a case in which caudal area 7 (mainly 7a) was injected.

Projections of the lateral terminal accessory optic nucleus of the common marmoset (Callithrix jacchus)

The connections of the lateral terminal nucleus (LTN) of the accessory optic system (AOS) of the marmoset monkey were studied with anterograde 3H-amino acid light autoradiography and horseradish peroxidase retrograde labeling techniques. Results show a first and largest LTN projection to the pretectal and AOS nuclei including the ipsilateral nucleus of the optic tract, dorsal terminal nucleus, and interstitial nucleus of the superior fasciculus (posterior fibers); smaller contralateral projections are to the olivary pretectal nucleus, dorsal terminal nucleus, and LTN. A second, major bundle produces moderate-to-heavy labeling in all ipsilateral, accessory oculomotor nuclei (nucleus of posterior commissure, interstitial nucleus of Cajal, nucleus of Darkschewitsch) and nucleus of Bechterew; some of the fibers are distributed above the caudal oculomotor complex within the supraoculomotor periaqueductal gray. A third projection is ipsilateral to the pontine and mesencephalic reticular formations, nucleus reticularis tegmenti pontis and basilar pontine complex (dorsolateral nucleus only), dorsal parts of the medial terminal accessory optic nucleus, ventral tegmental area of Tsai, and rostral interstitial nucleus of the medial longitudinal fasciculus. Lastly, there are two long descending bundles: (1) one travels within the medial longitudinal fasciculus to terminate in the dorsal cap (ipsilateral >> contralateral) and medial accessory olive (ipsilateral only) of the inferior olivary complex. (2) The second soon splits, sending axons within the ipsilateral and contralateral brachium conjunctivum and is distributed to the superior and medial vestibular nuclei. The present findings are in general agreement with the documented connections of LTN with brainstem oculomotor centers in other species. In addition, there are unique connections in marmoset monkey that may have developed to serve the more complex oculomotor behavior of nonhuman primates.

Pattern of striate cortical projections to the pretectal complex in the guinea pig

The primary goal of this study was to determine whether the striate cortex (Oc 1) of the guinea pig projects to the pretectal nucleus of the optic tract (NOT), the first postretinal station of the horizontal optokinetic pathway, and, if so, to analyze the anatomical organization of this cortico-NOT projection. Other goals of this investigation are to identify other pretectal nuclear projections from the visual cortex in the guinea pig, and to determine whether there is any visuotopic organization in this pathway. Axonal tracers (biocytin or 3H-leucine) were injected into the striate cortex (Oc 1), and the tissue processed with histochemical or light autoradiographic techniques. All subcortical terminal labeling is ipsilateral in the basal ganglia and thalamic nuclei. Furthermore, projections are traced to the ipsilateral brainstem, including two areas of the pretectal complex: (1) one in the NOT, extending in some cases to the adjacent lateral portion of the posterior pretectal nucleus (PPN), and (2) one in the pars compacta of the anterior pretectal nucleus (APNc). The terminal fields in the APN are consistently located rostrally in the dorsolateral portion of the nucleus, independently of the injection site in Oc 1, whereas in the NOT the terminal fields shift slightly after injections placed in different locations in the striate cortex. A correlation of the injection sites in Oc 1 and terminal fields in the NOT reveals a loose topographic organization in the cortico-NOT projection; accordingly, the rostrocaudal axis of the striate cortex projects to the lateromedial axis of the NOT, with a 90 degrees rotation, whereas lateral parts of the striate cortex project diffusely throughout the rostrocaudal extent of the NOT. These data show for the first time that the NOT in the guinea pig receives a substantial projection from the visual cortex. Given the fact that in the guinea pig the optokinetic nystagmus shares some of the characteristics found in cat and monkey (i.e., consistent initial fast rise in the slow phase velocity and reduced asymmetry in monocular stimulation), the present findings lend support to the hypothesis that a cortical input to the NOT is a necessary condition for these oculomotor properties to be present.

Kainic acid differently affects retinal projections to different pretectal nuclei

Kainic acid (KA) damages retinal cells, thus impairing axonal anterograde transport of labeled aminoacids when injected intravitreally. In this study, Long-Evans rats were injected with KA into one eye, and seven days later were binocularly injected with 14C-valine. The extent of residual retinal afferents to two pretectal nuclei was calculated as the percentage of the contralateral, intact side. Projections to the nucleus of the optic tract (first relay station of the optokinetic pathway) appear significantly more affected than those to the olivary pretectal nucleus (involved in the pupillary light response). These results suggest a correlation between the functional properties of retinal ganglion cells and distinctive biochemical characteristics, such as their susceptibility to KA.

Correlation between amount of retinal afferents to the pretectal nucleus of the optic tract and dorsal terminal accessory optic nucleus and performance of horizontal optokinetic reflex in rat

Intraocular kainic acid injection in Long-Evans rats induces loss of retinal afferents to subcortical visual centers as assessed by the axoplasmic transport of [14C]valine. The optical terminal fields of the pretectal nucleus of the optic tract (NOT), superior colliculus and accessory optic system (AOS) nuclei appear particularly affected. Since NOT and the AOS dorsal terminal nucleus (DTN) represent the first relay station of the visuomotor pathway mediating horizontal optokinetic nystagmus (HOKR), we have studied the characteristics of HOKR after various degrees of retinal deafferentation of these nuclei induced by intraocular KA injection. Taking advantage of the arrangement of the primary optic projections to NOT-DTN, that in rats are almost entirely crossed, in each animal, monocular HOKR induced by stimulation of the injected eye was compared to monocular HOKR elicited by stimulation of the intact, ipsilateral eye. Following NOT-DTN optic denervation, HOKR gain always worsened, and in a way, that the greater the deficits of retinal afferents, the greater the HOKR inability to compensate for visual motion. Furthermore, for any given retinal denervation the higher the stimulus velocity, the greater the HOKR deficit. While the correlation between HOKR gain and the amount of retinal afferents to NOT-DTN would seem to indicate a functional homogeneity of the retinal ganglion cells sending axons to these nuclei, the finding that the extent of HOKR impairment also varied with velocity might not support the above view.

Nondestructive two-dimensional refractive-index profiling of integrated-optical waveguides by an interferometric method

We describe an interferometric method that uses an interference microscope that permits the determination of the complete two-dimensional refractive-index profile of integrated optical waveguides, provided that the form of the one-dimensional depth profile is known. Results are reported for potassium-sodium ion-exchanged channel waveguides and are shown to be in good agreement with theory.

Correlation between retinal afferent distribution, neuronal size, and functional activity in the guinea pig medial terminal accessory optic nucleus

The intrinsic morpho-functional organization of the medial terminal nucleus of the accessory optic system was investigated in the guinea pig. The distribution of the retinal afferents, as assessed by the axoplasmic transport of 14C-valine, showed a remarkable asymmetry within the nucleus. Thus, while the retinal terminal field covered the entire medial terminal nucleus, by far the largest density of labeled retinofugal axon terminals was found within its dorsal division. In this same portion of the nucleus, we found the greatest density of large cells and the maximum intensity of functional activation, this latter as estimated by the increase in metabolic activity of neurons using the 14C-2-deoxyglucose autoradiographic method in the vertical and horizontal whole-field movement in the visual field.

The interstitial nucleus of the superior fasciculus, posterior bundle (INSFp) in the guinea pig: another nucleus of the accessory optic system processing the vertical retinal slip signal

As in rabbit, gerbil, and rat, the guinea pig interstitial nucleus of the superior fasciculus, posterior bundle (INSFp) is a sparse assemblage of neurons scattered among the fibers forming the fasciculus bearing this name. Most of the INSFp neurons are small and are ovoid in shape. Interspersed among these, are a few larger, elongated neurons whose density becomes greater and whose shape becomes fusiform in correspondence to the zone of transition from the superior fasciculus to the ventral part of the medial terminal nucleus (MTN). Like the MTN, the INSFp is activated by retinal-slip signals evoked by whole-field visual patterns moving in the vertical direction, as shown by the increase of 14C-2-deoxyglucose (2DG) uptake into this nucleus. At the same level of luminous flux, neither pattern moving in the horizontal direction nor the same pattern held stationary can elicit increases in the INSFp 2DG assumption. The specificity of the observed increases in metabolic rates in INSFp following vertical whole-field motion suggests that this assemblage of neurons relays visual signals used in the control of vertical optokinetic nystagmus.

A microcomputer-based distributed data management system for a large cooperative study of transfusion associated acquired immunodeficiency syndrome

This paper describes the details of a microcomputer-based, distributed data management system in the acquisition of data collected in a large multicentered cooperative investigation of transfusion-transmitted acquired immunodeficiency syndrome (AIDS). Clinical, virological, and immunological data are obtained from six clinical centers and six central laboratories using a variety of hardware components and software packages. Data are merged and processed on a mainframe computer at the Biostatistics Office at the University of Southern California. The advantages and disadvantages of this system are discussed relative to the dynamics of the study, the magnitude and nature of the database, and the organization of the distributed centers involved.