Influence of 4- and 6-color flow cytometers and acquisition/analysis softwares on the determination of lymphocyte subsets in HIV infection

BACKGROUND AND OBJECTIVES

Lymphocyte immunophenotyping provides valuable information for the diagnosis and monitoring of patients with cellular immunodeficiencies, such as HIV/AIDS. In this study, we have assessed the influence of 4-color and 6-color flow cytometers, and respective analytical softwares on the enumeration of lymphocytes in HIV infected individuals.

METHODS

The expression of various cell surface markers on lymphocytes was measured from the EDTA blood of 66 HIV infected patients on the FACSCalibur (4-color) and FACSCanto (6-color) flow cytometers. Percentage of lymphocytes expressing a particular cell surface marker was analyzed on FACSCalibur using the Cell Quest Pro software (v 5.2), while the analysis on FACSCanto was done using FACSCanto (v 1.0.3) and FACSDiva (v 4.1) softwares respectively.

RESULTS

The data shows significantly higher mean CD3 T-cell counts on FACSCalibur, Cell Quest Pro (1,864 +/- 1,044 cells/microl) as compared to FACSCanto (1,840 +/- 1,040 cells/microl) (P < 0.05). The CD4 T-cell counts were also higher on FACSCalibur, Cell Quest Pro (885 +/- 770 cells/microl), and FACSDiva (892 +/- 773 cells/microl) versus FACSCanto (867 +/- 767 cells/microl) (P < 0.05). FACSCalibur, Cell Quest Pro, and FACSDiva showed similar values except for CD8 T-lymphocytes where FACSDiva had significantly lower values (P < 0.05). The B-cell counts were unaffected when either of the instruments or softwares were used, while the natural killer (NK) cells (CD16 + 56 positive cells) showed similar trend like CD3 and CD4 counts with significant differences in the mean cell counts between FACSCalibur, Cell Quest Pro (240 +/- 165 cells/microl), and FACSDiva (238 +/- 163 cells/microl) versus FACSCanto with higher NK cell counts (260 +/- 176 cells/microl).

CONCLUSIONS

The enumeration of lymphocyte subsets was comparable between FACSCalibur, Cell Quest Pro, and FACSDiva, based analysis and it was significantly different than FACSCanto software based analysis. Our observations suggest that FACSDiva software should be preferred over the FACSCanto software for immunophenotyping on FACSCanto flow cytometer and the laboratories should report the instrument and software used for the specimen analysis while reporting immunophenotyping results.

What do dental students think about mandatory laptop programs?

In spite of efforts by many dental schools to provide information technology resources for students, only a handful of studies have been conducted to determine what dental students think about these initiatives. There are no reports in the literature describing students' perceptions of mandatory laptop programs, which are now being implemented by at least 25 percent of North American dental schools. In schools that have implemented laptop programs, students are required either to enroll with their own laptops that meet specifications or to purchase a laptop from the school at matriculation. In some schools, students are also required to purchase curriculum support software that is bundled with the laptop. This study was conducted to determine students' opinions at U.S. dental schools with mandatory laptop programs about these aspects of this information technology initiative: frequency of use, perceived necessity of use, note-typing during lectures, effectiveness of training, influence on study habits, benefits, implementation problems, added value in relation to added tuition costs, impact on quality of dental education, overall rating of the laptop experience, and impact of the laptop on use of other electronic curriculum resources. Responses of students at schools that purchased packaged curriculum support software from a commercial vendor were compared with students' responses at schools where faculty provided their own educational software. Responses were also compared among freshmen, sophomores, and upperclassmen in a cross-sectional sample. In 2004, approximately 800 dental students at fourteen dental schools responded to eleven questions that requested their impressions and evaluation of mandatory laptop programs and associated educational software. These questions comprised one section of the IREC Students' Questionnaire (IREC=Institutional Readiness for Electronic Curriculum) that assessed students' perceptions of various aspects of information technology at their schools. The majority of students (63 percent) reported that the laptop and associated software were not essential for successful performance in their courses primarily because few instructors had modified their courses to take advantage of laptop capacities. Slightly more than half of the students reported their training was good or excellent, but felt that classroom-based "one size fits all" training was not effective. Less than 15 percent of the students reported that they had made substantial changes in their study habits as a consequence of the laptop program. The benefits perceived by students were primarily related to enhanced email communication with classmates and instructors and convenient access to the Internet and teachers' PowerPoint presentations. Implementation barriers included the inconvenience of carrying laptops to classes, lack of incentive to use the laptop and software because instructors did not require it, and poor quality software. Only 32 percent of students agreed that the value of the laptop and associated software was equal to the added tuition costs. Less than half of the students perceived that the laptop and software had improved the quality of their education, but more than 70 percent rated their overall experiences with laptops as "okay," "good," or "excellent." Freshmen expressed significantly more positive attitudes about the frequency of use, cost-effectiveness, educational value, and overall quality of laptops and bundled software than did upperclassmen. A significantly higher percentage of students at schools affiliated with a software vendor reported that laptops were essential in courses than students at schools with locally produced software, but students at vendor-supplied schools rated the cost-effectiveness significantly lower. Overall, students' assessment of mandatory laptop programs was mixed although freshmen provided significantly more positive responses than did upperclassmen. Incorporation of the e-curriculum into dental schools appears to be following a similar pattern as problem-based learning (PBL) in the 1980s and 1990s. Recommendations for enhancing future e-curricula are proposed based on lessons learned from both information technology and PBL implementation.

Appraisal of the dental school learning environment: the students' view

The majority of studies examining dental school curriculum have addressed organization, structure, and content issues from the perspectives of administrators, faculty, practitioners/alumni, and professional organizations. However, few studies have focused on students' opinions of dental school. The purpose of this study was to determine students' perceptions of the learning environment, intellectual climate, and teacher-student relationships in dental school. This report describes how the "dental version" of the Medical Student Learning Environment Survey (MSLES) was used to identify students' perceptions of their dental education. Freshman and junior dental students' perceptions were measured with the Dental Student Learning Environment Survey (DSLES), which evaluates learning environment, intellectual climate, and relationships among students and teachers in seven areas: flexibility, student-to-student interaction, emotional climate, supportiveness, meaningful experience, organization, and breadth of interest. The DSLES was mailed to twenty-three dental schools in North America with eighteen of the schools distributing the inventory. A total of 619 dental students responded. Results were differentiated between freshman and junior dental students. Both freshman and junior students provided the highest (most positive) ratings for the DSLES subscales of "breadth of interest" (interest in dentistry and outside interests are encouraged) and "meaningful learning experience" (significance of courses to dentistry). Freshman students provided the lowest (least positive) ratings for "emotional climate" (students' responses to the way their courses were conducted and stress levels), and junior students provided the least positive ratings for "faculty supportiveness" (extent of faculty support and encouragement provided to students). The DSLES identified students' perceptions of their educational experience and localized areas for improvement. By addressing these areas of concern, faculty can increase student satisfaction with their dental education.

Electronic curriculum implementation at North American dental schools

Electronic curriculum, or E-curriculum, refers to computer-based learning including educational materials available on CD or DVD, online courses, electronic mechanisms to search the literature, email, and various applications of instructional technology including providing laptops to students, multimedia projection systems, and Internet-compatible classrooms. In spite of enthusiasm about the potential for E-curriculum to enhance dental education, there is minimal guidance in the literature to assist schools with implementation. The study objectives were: 1) identify U.S. and Canadian dental schools that have initiated mandatory laptop programs and assess cost, faculty development issues, extent of curricular use, problems, and qualitative perceptions; 2) determine the extent to which twenty-two other E-curriculum resources were available and used at North American dental schools; and 3) identify factors that influenced E-curriculum implementation. A twenty-six item questionnaire, known as the Electronic Curriculum Implementation Survey (ECIS), was mailed to all sixty-six North American dental schools (ten Canadian and fifty-six U.S. schools) during 2002-03 with a response rate of 100 percent. Twenty-five of the twenty-six ECIS questions employed a menu-driven, forced choice format, but respondents could provide amplifying comments. Fifty-three questionnaires were completed by associate deans for academic affairs, three by deans, and ten by instructional technology (IT) managers, IT committee chairs, or directors of dental informatics departments. The survey found that E-curriculum implementation among North American dental schools is following the classic innovation pattern in which a few early adopting institutions proceed rapidly while the majority of potential adopters make modifications slowly. Fourteen U.S. dental schools have established mandatory laptop programs for students. Ten of these laptop programs were created in the past two years; respondents reported numerous growing pains but were generally pleased with their progress. Other E-curriculum capabilities were incorporated into courses more frequently at laptop schools than the fifty-two non-laptop schools including websites, online course evaluations, and instructor use of email to communicate with students. Few dental schools use online courses, and at most schools, few faculty have received training in online instructional techniques. Virtually all North American dental schools have provided substantial instructional technology resources to their faculty, but use of twenty-two components and capabilities of E-curriculum was limited, especially at schools without laptop programs. Various faculty-related issues were reported as implementation barriers including lack of time, skill, and incentive to develop educational software. We conclude that many North American dental schools, especially those with laptop programs, are functioning at the "learn by doing" phase of initial implementation in a four-stage innovation adoption model. E-curriculum planners should pay close attention to implementation problems that occur at this stage where many innovation efforts break down.