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Biomedical subjects

Michelle Howard

Publications and source records attributed to Michelle Howard.

At least 19 recordsLinked to original sources
PubMed2006

Preliminary report of a gas conditioner to improve operational reliability of cryotherapy in developing countries.

BACKGROUND: Cryotherapy is a safe, affordable, and effective method of treatment for cervical intraepithelial neoplasia. In some low-resource settings, environmental conditions or qualities of the refrigerant gas can lead to blockage of cryotherapy equipment, terminating treatment. A prototype of a gas conditioner to prevent operational failure was designed, built, and field tested. METHODS: The prototype conditioner device consists of an expansion chamber that filters and dries the refrigerant gas. Users in Peru and Kenya reported on their experience with the prototype conditioner. In Ghana, simulated cryotherapy procedures were used to test the effects of the prototype conditioner, as well as the commonly used "cough technique." RESULTS: Anecdotal reports from field use of the device were favorable. During simulated cryotherapy, the prevalence of blockage during freezing were 0% (0/25) with the device alone, 23.3% (7/30) with the cough technique alone, 5.9% (1/17) with both, and 55.2% (16/29) with neither (Pearson's Chi square = 26.6, df = 3, p < 0.001 (comparison amongst all groups)). CONCLUSION: This prototype design of a cryotherapy gas conditioner is a potential solution for low-resource settings that are experiencing cryotherapy device malfunction.

Journal Article↗
PubMed2006

Self-sampling for group B streptococcus in women 35 to 37 weeks pregnant is accurate and acceptable: a randomized cross-over trial.

OBJECTIVE: In Canada, screening for group B Streptococcus (GBS) in pregnant women is recommended at 35 to 37 weeks' gestation. Since there is normally no other indication for pelvic examination at this stage of pregnancy, women may be more comfortable performing the test themselves. We assessed the accuracy of self- sampling versus clinician sampling for GBS and women's preference for each collection method. METHODS: Consecutive patients presenting between October 2003 and April 2005 to a maternity centre in Hamilton for their 35- to 37-week prenatal visit were randomly allocated to having vaginal-rectal swabs self-collected, and then collected by a clinician, or to having the swabs clinician-collected, and then self-collected. The main outcomes were prevalence of infection and sensitivity of the two methods. Other analyses compared women who refused participation in the study with those who participated, and preference for sampling method before and after conducting the tests. RESULTS: Of the 386 women approached, 330 (85.5%) agreed to participate. The prevalence of GBS was 17.0% (56/330) and 18.8% (62/330) in the self-obtained and clinician-obtained specimens respectively (difference =1.8%; 95% confidence intervals [CI] -2.0-6.0). Sensitivity was 87.5% (95% CI 77.0-93.8) and 96.9% (95% CI 88.7-99.8) for the self-obtained and clinician-obtained specimens respectively. Women who declined to participate in self-sampling were significantly more likely not to have completed high school and to prefer clinician sampling. Prior to testing, 79% of women preferred self-sampling or had no preference. Preference was unchanged for approximately two-thirds of women after sampling. CONCLUSION: Self-sampling for GBS is an accurate and acceptable alternative for the majority of pregnant women. Less-educated women may be hesitant to self-sample, and clinician sampling should remain an option.

Adult↗
PubMed2005

The 1999 international emergency humanitarian evacuation of the Kosovars to Canada: A qualitative study of service providers' perspectives at the international, national and local levels.

BACKGROUND: In response to the Kosovo crisis, Canada received 5,500 Albanian Kosovar refugees in 1999 as part of the emergency humanitarian evacuation and settlement effort. This study attempts to describe the experiences of service providers at the international, national, and local levels, involved in the organization and delivery of health and settlement services in Canada for the Kosovar refugees. METHODS: A qualitative case study design using key informant interviews was used. Nominated sampling was used to identify 17 individuals involved in the organization and delivery of health and settlement. Key themes were identified and recommendations made to provide a framework for the development of policy to guide response to future humanitarian emergencies. RESULTS: Six themes emerged: (1) A sense of being overwhelmed, (2) A multitude of health issues, (3) critical challenges in providing health care, (4) access to health and settlement services, (5) overall successes and (6) need for a coordinated approach to migration health. CONCLUSIONS: For those involved, the experience was overwhelming but rewarding. Interviewees' major concerns were the need for a more comprehensive and coordinated approach to the flow of medical information and handling of specific health problems.

Journal Article↗
PubMed2005

Family medicine obstetrics. Collaborative interdisciplinary program for a declining resource.

PROBLEM BEING ADDRESSED: A continuing decline in the number of family physicians in Canada providing obstetric, and particularly intrapartum, care. OBJECTIVE OF PROGRAM: The Maternity Centre of Hamilton in Ontario was a pilot project initiated to help family physicians provide full obstetric care through a collaborative interdisciplinary model and shared call. PROGRAM DESCRIPTION: Eleven family physicians provided care in collaboration with a nurse practitioner and other health professionals. Women came from the Maternity Centre's own practices, community physicians, or agencies, or through self-referral. More than a quarter of the women were considered psychosocially high-risk patients. Key features of the program included interdisciplinary collaboration and information technology that supported prenatal and birth documentation. CONCLUSION: The program has helped family physicians, and even recruited some, to practise full obstetric care and has provided high-quality, accessible services to pregnant women. Physicians experienced increased jab and personal satisfaction, and patients were highly satisfied with the service.

Cooperative Behavior↗
PubMed2004

Prescribing of potentially inappropriate medications to elderly people.

OBJECTIVE: To estimate the prevalence and predictors of medications deemed potentially inappropriate for the elderly among family physicians' patients aged 65 and older (seniors) taking multiple prescribed medications. METHODS: Forty-eight randomly selected family practices in 16 towns and cities in Southern Ontario, Canada and 889 of their senior patients were recruited into a randomized trial. We conducted a cross-sectional analysis of prescription insurance data from the provincial universal prescription insurance database over 12 months, from the 777 seniors who completed the trial and agreed to have their data released. The prevalence and patient and physician predictors of use of a potentially inappropriate medication (PIM), as defined by published widely accepted criteria, were examined. RESULTS: The median number of prescriptions filled was 24. Nearly one-fifth (16.3%) of the seniors received at least one prescription for a PIM, with short-acting benzodiazepine prescriptions for longer than 30 days (6.4%) and oxybutynin (3.7%) being the types prescribed most frequently. In univariate and multiple variable analyses, women were found to be statistically significantly more likely to be prescribed a PIM (adjusted OR = 1.6; 95% confidence interval = 1.0-2.4). Age, education, self-rated health, number of health conditions, and number of prescriptions were not associated with PIM use. Physician gender, family medicine certification status, and time since graduation were not significantly associated with PIM prescribing. CONCLUSIONS: Prescribing of PIMs, especially of short-acting benzodiazepines was common in seniors taking multiple medications. Interventions to reduce use of PIM, especially long-term benzodiazepines, are important in primary care.

Aged↗
PubMed2004

Optimal cutoff of the hybrid capture II human papillomavirus test for self-collected vaginal, vulvar, and urine specimens in a colposcopy referral population.

OBJECTIVE: To estimate the optimal relative light unit ratio, as a measure of viral load, of the Hybrid Capture II human papillomavirus (HPV) test in self-collected specimens for detecting cervical intraepithelial neoplasia (CIN). METHODS: Two hundred women referred for colposcopy with abnormal cytologic, self-collected vaginal and vulvar swabs and urine for HPV testing. The receiver operating characteristic (ROC) curve method was used to estimate optimal cutoffs for the Hybrid Capture II test. The reference standard was colposcopy, with directed biopsy as required. RESULTS: The estimated optimal cutoffs of the relative light unit ratio for detecting CIN 2 or higher for urine, vulvar, and vaginal samples gave sensitivities of 72.4%, 82.8%, and 89.0% and specificities of 57.0%, 52.1%, and 55.9%, respectively. At the manufacturer's recommended 1.0 cutoff, sensitivities were 44.8%, 62.1%, and 86.2% for urine, vulvar, and vaginal samples, with specificities of 69.7%, 62.7%, and 53.5%, respectively. The likelihood ratios (likelihood of being truly positive after a positive test result) were similar for the optimal and the 1.0 cutoff. CONCLUSIONS: The ROC curve methods did not improve the overall diagnostic accuracy of the Hybrid Capture II test compared with the 1.0 relative light unit ratio cutoff.

Journal Article↗
PubMed2004

Combining human papillomavirus testing or cervicography with cytology to detect cervical neoplasia.

CONTEXT: Cervicography and oncogenic human papillomavirus (HPV) testing have been proposed for improving the accuracy of cervical cancer screening. OBJECTIVE: To examine whether cervicography and HPV testing can improve beyond chance the detection of cervical intraepithelial neoplasia (CIN) 2 or 3 in women with atypical cells of undetermined significance or low-grade squamous intraepithelial lesions on cytology. DESIGN: Cross-sectional analysis. Oncogenic HPV testing by Hybrid Capture II assay or cervicography combined with cytology was compared with the reference standard of colposcopy with directed biopsy. SETTING: Community family practices. PARTICIPANTS: Three hundred four women with low-grade cytologic abnormality. MAIN OUTCOME MEASURES: The gain in accuracy for detecting histologic CIN 2 or 3 or carcinoma. Because an adjunct test may improve sensitivity by chance alone, the sensitivity or specificity if the second test performed randomly was estimated. RESULTS: Cervical intraepithelial neoplasia 2 or 3 was found in 11.8% (36/304) of the women and invasive squamous cell carcinoma in 0.3% (1/304). The sensitivity of cytology for detecting CIN 2 or 3 was 73.0% and increased by 21.6% to 94.6% with the addition of a cervigram showing a low-grade lesion or higher or a positive HPV test result. These gains were reduced to 8.1% and 10.8% above the sensitivities expected if the additional tests performed randomly. The corresponding specificities decreased from 49.1% to 32.2% and 33.0%. There was insufficient power to determine whether observed sensitivities were statistically significantly higher than the expected sensitivities. CONCLUSION: Adjunctive HPV testing or cervicography may provide similar gains in sensitivity, but they can appear misleadingly large if chance increases are not taken into account.

Adult↗
PubMed2003

A randomized controlled trial of a pharmacist consultation program for family physicians and their elderly patients.

BACKGROUND: Pharmacists can improve patient outcomes in institutional and pharmacy settings, but little is known about their effectiveness as consultants to primary care physicians. We examined whether an intervention by a specially trained pharmacist could reduce the number of daily medication units taken by elderly patients, as well as costs and health care use. METHODS: We conducted a randomized controlled trial in family practices in 24 sites in Ontario. We randomly allocated 48 randomly selected family physicians (69.6% participation rate) to the intervention or the control arm, along with 889 (69.5% participation rate) of their randomly selected community-dwelling, elderly patients who were taking 5 or more medications daily. In the intervention group, pharmacists conducted face-to-face medication reviews with the patients and then gave written recommendations to the physicians to resolve any drug-related problems. Process outcomes included the number of drug-related problems identified among the senior citizens in the intervention arm and the proportion of recommendations implemented by the physicians. RESULTS: After 5 months, seniors in the intervention and control groups were taking a mean of 12.4 and 12.2 medication units per day respectively (p = 0.50). There were no statistically significant differences in health care use or costs between groups. A mean of 2.5 drug-related problems per senior was identified in the intervention arm. Physicians implemented or attempted to implement 72.3% (790/1093) of the recommendations. INTERPRETATION: The intervention did not have a significant effect on patient outcomes. However, physicians were receptive to the recommendations to resolve drug-related problems, suggesting that collaboration between physicians and pharmacists is feasible.

Aged↗
PubMed2003

Randomizing patients by family practice: sample size estimation, intracluster correlation and data analysis.

BACKGROUND: Cluster randomized controlled trials increasingly are used to evaluate health interventions where patients are nested within larger clusters such as practices, hospitals or communities. Patients within a cluster may be similar to each other relative to patients in other clusters on key variables; therefore, sample size calculations and analyses of results require special statistical methods. OBJECTIVE: The purpose of this study was to illustrate the calculations used for sample size estimation and data analysis and to provide estimates of the intraclass correlation coefficients (ICCs) for several variables using data from the Seniors Medication Assessment Research Trial (SMART), a community-based trial of pharmacists consulting to family physicians to optimize the drug therapy of older patients. METHODS: The study was a paired cluster randomized trial, where the family physician's practice was the cluster. The sample size calculation was based on a hypothesized reduction of 15% in mean daily units of medication in the intervention group compared with the control group, using an alpha of 0.05 (one-tailed) with 80% power, and an ICC from pilot data of 0.08. ICCs were estimated from the data for several variables. The analyses comparing the two groups used a random effects model for a meta-analysis over pairs. RESULTS: The design effect due to clustering was 2.12, resulting in an inflation in sample size from 340 patients required using individual randomization, to 720 patients using randomization of practices, with 15 patients from each of 48 practices. ICCs for medication use, health care utilization and general health were <0.1; however, the ICC for mean systolic blood pressure over the trial period was 0.199. CONCLUSIONS: Compared with individual randomization, cluster randomization may substantially increase the sample size required to maintain adequate statistical power. The differences in ICCs among potential outcome variables reinforce the need for valid estimates to ensure proper study design.

Aged↗
PubMed2003

Prevalence of Chlamydia trachomatis infections and specimen collection preference among women, using self-collected vaginal swabs in community settings.

BACKGROUND: Chlamydia trachomatis is a common, often asymptomatic sexually transmitted infection. GOAL: The goal was to estimate the prevalence and predictors of C. trachomatis among young women using self-collected vaginal swabs, and the preferences of women and physicians for self-testing. STUDY DESIGN: A total of 514 attendees of university/college health clinics, adolescent birth control clinics, centers providing health services to homeless youth and adults (street health centers), a sexually transmitted diseases clinic, and family practices were tested by ligase chain reaction. Preference for self- versus provider-testing was examined. RESULTS: Prevalence was 6.0% and was highest (18.2%) in the street health centers. In multivariate analysis, only recent contact with someone with C. trachomatis infection was significantly associated with infection (odds ratio, 7.1; 95% confidence interval, 2.5-20.0). Most women (54.2%; 256 of 472) preferred self-sampling compared with physician sampling (15.9%; 75 of 472). The majority of physicians (75.0%; 9 of 12) reported at the start and end of the study that they would use vaginal swab self-sampling if available. CONCLUSIONS: Prevalence of infection in young women attending homeless youth organizations was high. Self-sampling was acceptable and could facilitate screening in high-risk women who do not regularly access health services.

Adolescent↗
PubMed2003

Regional distribution of antibodies to herpes simplex virus type 1 (HSV-1) and HSV-2 in men and women in Ontario, Canada.

This study estimated the regional and age- and gender-specific seroprevalences of herpes simplex virus type 1 (HSV-1) and HSV-2 in Ontario, Canada. Stored serum specimens from subjects aged 15 to 44 years, including men (n = 979), women not under prenatal care (n = 638), and women under prenatal care (n = 701) submitted for routine viral serology were randomly selected according to regional population size from public health laboratories. HSV-1 and HSV-2 testing was done with the MRL enzyme immunoassay (EIA) (Focus Technologies), and HSV-2 was also tested by the Gull/Meridian EIA. Specimens discordant for HSV-2 antibodies between the two EIAs were resolved by a recombinant immunoblot assay (Focus Technologies). The overall age- and gender-standardized seroprevalences of HSV-1 and HSV-2 were 51.1% (95% confidence interval [CI], 50.1 to 52.1) and 9.1% (95% CI, 8.6 to 9.7), respectively. The seroprevalence of HSV-1 antibodies increased from 26.9 to 54.7% in men between 15 to 16 and 40 to 44 years of age, from 32.0 to 88.7% in women not under prenatal care, and from 55.2 to 69.2% in women under prenatal care. The seroprevalence of HSV-2 increased from 3.8 to 21.3% in men between 15 to 16 and 40 to 44 years of age, from 0 to 18.9% in women not under prenatal care, and from 3.4 to 23.1% in women under prenatal care. HSV-2 results were discordant for 3.3% (76 of 2,318) of specimens. Both types of HSV antibodies appeared to be acquired earlier among women under prenatal care than among men and women not under prenatal care. Antibodies were more prevalent among people in northern Ontario (72.9% of subjects [range, 68.4 to 77.4%] for HSV-1 and 13.7% of subjects [95% CI, 10.2 to 17.2%] for HSV-2) than elsewhere.

Adolescent↗
PubMed2003

Adjunctive human papillomavirus testing in the 2-year follow-up of women with low-grade cervical cytologic abnormalities: a randomized trial and economic evaluation.

CONTEXT: Although human papillomavirus (HPV) testing may aid in managing low-grade abnormality on screening cervical cytology, patient compliance with repeat testing programs requires consideration. OBJECTIVES: To determine effectiveness and costs of repeated Papanicolaou (Pap) test and oncogenic HPV testing for detecting cervical intraepithelial neoplasia 2 or 3. DESIGN: We conducted a randomized controlled trial of combined Pap test and cervical HPV testing by Hybrid Capture 1 test compared with Pap test alone; tests were performed every 6 months for up to 2 years. The study end point was colposcopic examination performed on all women at 2 years, or earlier if an HPV test was positive or if a Pap test showed high-grade squamous intraepithelial lesion. SETTING: Sixty-six community family practices. PARTICIPANTS: Two hundred fifty-seven women with atypical squamous cells of undetermined significance or low-grade squamous intraepithelial lesion on screening cervical cytology. MAIN OUTCOME MEASURES: Detection of histologically confirmed cervical intraepithelial neoplasia 2 or 3, fully allocated costs, and loss to follow-up. RESULTS: Combined Pap test and HPV testing detected 11 (100%) of 11 cases of cervical intraepithelial neoplasia 2/3, whereas Pap test alone detected 7 (63.6%) of these 11 cases (P =.14); corresponding specificities were 39 (46.4%) of 84 and 45 (71.4%) of 63 (P =.005). The cost-effectiveness ratio was Can $4456 per additional case of high-grade cervical intraepithelial neoplasia. Sixty-nine (26.8%) of the 257 women (24.6% combined group vs 29.1% Pap test only group, P =.41) defaulted from testing or from colposcopy when referred with an abnormal result. CONCLUSIONS: Combined testing was more costly but may detect more cases of cervical intraepithelial neoplasia 2/3 than Pap test alone. However, poor adherence limits usefulness of a management strategy that requires repeated follow-up.

Adult↗
PubMed2002

Comparison of deferral rates using a computerized versus written blood donor questionnaire: a randomized, cross-over study [ISRCTN84429599].

BACKGROUND: Self-administered computer-assisted blood donor screening strategies may elicit more accurate responses and improve the screening process. METHODS: Randomized crossover trial comparing responses to questions on a computerized hand-held tool (HealthQuiz, or HQ), to responses on the standard written instrument (Donor Health Assessment Questionnaire, or DHAQ). Randomly selected donors at 133 blood donation clinics in the area of Hamilton, Canada participated from 1995 to 1996. Donors were randomized to complete either the HQ or the DHAQ first, followed by the other instrument. In addition to responses of 'yes' and 'no' on both questionnaires, the HQ provided a response option of 'not sure'. The primary outcome was the number of additional donors deferred by the HQ. RESULTS: A total of 1239 donors participated. Seventy-one potential donors were deferred as a result of responses to the questionnaires; 56.3% (40/71) were deferred by the DHAQ, and an additional 43.7% (31/71) were deferred due to risks identified by the HQ but not by the DHAQ. Fourteen donors self-deferred; 11 indicated on the HQ that they should not donate blood on that day but did not use the confidential self-exclusion option on the DHAQ, and three used the self-exclusion option on the DHAQ but did not indicate that they should not donate blood on the HQ. The HQ identified a blood contact or risk factor for HIV/AIDS or sexually transmitted infection that was not identified by the DHAQ in 0.1% to 2.7% of donors. CONCLUSION: A self-administered computerized questionnaire may increase risk reporting by blood donors.

Anonymous Testing↗
PubMed2002

Optimizing the hybrid capture II human papillomavirus test to detect cervical intraepithelial neoplasia.

OBJECTIVE: To estimate the optimal relative light unit ratio, and correspondingly viral load, of the hybrid capture II oncogenic human papillomavirus deoxyribonucleic acid test for detecting cervical intraepithelial neoplasia (CIN). METHODS: Women with abnormal cytology were referred for colposcopy, and a cervical swab or brush specimen was obtained for human papillomavirus testing. Sensitivities, specificities, and likelihood ratios of different relative light unit ratio cutoffs were calculated using a reference standard of colposcopy or biopsy of either CIN II+ (CIN II, III, or carcinoma), or CIN I+ (CIN I, CIN II+). The receiver operating characteristic curve was used to estimate optimal test-positive cutoff points for the hybrid capture II test. RESULTS: CIN II+ was found in 18.7% (98 of 524) and CIN I in 10.5% (55 of 524) of the women. The optimal relative light unit ratio was 15.56, giving a sensitivity and specificity of 82.7% and 73.2% for CIN II+, and 74.2% and 77.8% for CIN I+. In a stratified analysis, a higher relative light unit cutoff (15.19) optimized sensitivity and specificity for CIN II+ (sensitivity 81.8%, specificity 51.5%) for women with low-grade squamous intraepithelial lesions cytology, whereas the optimal cutoff was 2.36 (sensitivity 100%, specificity 73.0%) for women with atypical squamous cells of undetermined significance, yielding referral rates of 53.3% and 28.7%, respectively. Use of a swab or brush was not associated with the level of human papillomavirus detected (P >.05). CONCLUSION: Use of a higher cutoff for the relative light unit ratio (higher viral load) of the hybrid capture II test may improve the management of women, especially those with low-grade squamous intraepithelial lesions cytology.

Adolescent↗
PubMed2002

Recruiting family physicians and patients for a clinical trial: lessons learned.

BACKGROUND: The randomized controlled trial (RCT) is the most definitive tool for evaluating an intervention. However, methodological deficiencies may limit the internal or external validity of the RCT. OBJECTIVE: Our aim was to describe the tactics used and the resources required randomly to select and recruit family physicians (FPs) and their patients aged 65 and older (seniors) for a community-based cluster RCT in primary care. METHODS: We randomly selected 48 FPs in 24 urban and rural sites in Southern Ontario, and 889 of their community-dwelling seniors (approximately 20 per FP) taking five or more medications daily. To accomplish this, the principal investigator (an FP) contacted the eligible FPs. The participating FPs' office staff then generated and contacted the roster of eligible seniors, with support provided by the research staff. RESULTS: Of the 163 randomly selected FPs telephoned, 94 were ineligible and 48 (69.6%) of the remaining 69 participated. The rosters were generated with the assistance of the research staff (taking 1.5-8.0 hours) in each of the 48 practices, using electronic appointment records (n = 26), electronic billing records (n = 17), electronic medical records (n = 2) or written charts or file cards (n = 3). Of the 2078 seniors approached, 799 were ineligible and 889 (69.5%) of the remaining 1279 participated. Seniors' refusal rates among practices ranged from 4.8 to 62.3%. CONCLUSIONS: Recruitment of a representative sample and generalizability of results are possible in RCTs in primary care. Involvement of an FP in physician recruitment and clinical research nurses who provided assistance to office staff were keys to success.

Aged↗
PubMed2002

Explaining the adoption of telemedicine services: an analysis of a paediatric telemedicine service.

Since 1998, over 1300 telemedicine consultations have been provided to 12 schools in Kansas City. Despite the success of the programme, effective utilization of services has not occurred at all sites. We used a focus group and survey methods to investigate barriers to and catalysts for service adoption. The results showed that the school nurses strongly supported the programme. They valued its ability to provide health-care for the children and they welcomed their enhanced role. However, technical complexities and difficulties in obtaining parental consent were found to impede adoption. The nurses also expressed frustration with school personnel who had a poor understanding of their role in general as well as that of the telemedicine service. A new state reimbursement policy may promote greater understanding and provide a financial incentive for schools to adopt the telemedicine service.

Attitude of Health Personnel↗