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J M FitzGerald

Publications and source records attributed to J M FitzGerald.

At least 19 recordsLinked to original sources
PubMed2002

A meta-analysis of the effect of Bacille Calmette Guérin vaccination on tuberculin skin test measurements.

BACKGROUND: The accurate diagnosis of latent tuberculosis infection (LTBI) is an important component of any tuberculosis control programme and depends largely on tuberculin skin testing. The appropriate interpretation of skin test results requires knowledge of the possible confounding factors such as previous BCG vaccination. Uncertainty about the effect of BCG vaccination on tuberculin skin testing and the strength with which recommendations are made to individual patients regarding treatment of LTBI have identified a need to analyse the available data on the effect of BCG on skin testing. A meta-analysis of the evidence for the effect of BCG vaccination on tuberculin skin testing in subjects without active tuberculosis was therefore performed. METHODS: Medline was searched for English language articles published from 1966 to 1999 using the key words "BCG vaccine", "tuberculin test/PPD", and "skin testing". Bibliographies of relevant articles were reviewed for additional studies that may have been missed in the Medline search. Articles were considered for inclusion in the meta-analysis if they had recorded tuberculin skin test results in subjects who had received BCG vaccination more than 5 years previously and had a concurrent control group. Only prospective studies were considered. The geographical location, number of participants, type of BCG vaccine used, type of tuberculin skin test performed, and the results of the tuberculin skin test were extracted. RESULTS: The abstracts and titles of 980 articles were identified, 370 full text articles were reviewed, and 26 articles were included in the final analysis. Patients who had received BCG vaccination were more likely to have a positive skin test (5 TU PPD: relative risk (RR) 2.12 (95% confidence interval (CI)1.50 to 3.00); 2 TU RT23: 2.65 [corrected] (95% CI 1.83 to 3.85). The effect of BCG vaccination on PPD skin test results was less after 15 years. Positive skin tests with indurations of >15 mm are more likely to be the result of tuberculous infection than of BCG vaccination. CONCLUSIONS: In subjects without active tuberculosis, immunisation with BCG significantly increases the likelihood of a positive tuberculin skin test. The interpretation of the skin test therefore needs to be made in the individual clinical context and with evaluation of other risk factors for infection. The size of the induration should also be considered when making recommendations for treatment of latent infection.

BCG Vaccine↗
PubMed2000

Hospital ventilation and risk for tuberculous infection in canadian health care workers. Canadian Collaborative Group in Nosocomial Transmission of TB.

BACKGROUND: The risk for and determinants of transmission of tuberculosis in hospitals caring for moderate numbers of patients with tuberculosis remain uncertain. OBJECTIVE: To study the association of tuberculin conversion among health care workers with ventilation of patient care areas. DESIGN: Cross-sectional observational survey. SETTING: 17 acute-care community or university hospitals. PARTICIPANTS: All personnel who worked at least 2 days per week in the respiratory and physiotherapy departments or in selected nursing units. MEASUREMENTS: Participating workers underwent tuberculin skin testing and completed self-administered questionnaires. Previous tuberculin tests and bacille Calmette-Guérin vaccinations were verified. Records of patients with tuberculosis who were hospitalized in the 3 years preceding the study were reviewed. Air exchanges per hour in patient care areas were measured by using a tracer gas technique. Multivariate proportional hazards regression was used to estimate the effect of occupational factors on documented tuberculin conversion, after adjustment for nonoccupational factors, among participants with at least one previous negative result on tuberculin skin testing. RESULTS: Tuberculin conversion was associated with ventilation of general or nonisolation patient rooms of less than 2 air exchanges per hour (adjusted hazard ratio, 3.4 [95% CI, 2.1 to 5.8]); with work in moderate- to high-risk hospitals (adjusted hazard ratio, 2.2 [CI, 1.3 to 3.5]); and with work in the nursing (adjusted hazard ratio, 4.3 [CI, 2.7 to 6.9]), respiratory therapy (adjusted hazard ratio, 6.1 [CI, 3.1 to 12.0]), and physiotherapy (adjusted hazard ratio, 3.3 [CI, 1.5 to 7.2]) departments or housekeeping (adjusted hazard ratio, 4.2 [CI, 2.3 to 7.6]). Conversion was not associated with inadequate ventilation of respiratory isolation rooms (adjusted hazard ratio, 1.0 [CI, 0.8 to 1.3]). CONCLUSION: Tuberculin conversion among health care workers was strongly associated with inadequate ventilation in general patient rooms and with type and duration of work, but not with ventilation of respiratory isolation rooms.

Canada↗
PubMed2000

Management of adverse reactions to bacille Calmette-Guérin vaccine.

Published reports appear to underestimate the true rate of adverse reactions to bacille Calmette-Guérin (BCG) vaccine. At a recent national conference on tuberculosis control among aboriginal populations, lack of awareness of what constitutes an adverse reaction was considered a possible contributing factor to underreporting. The following review defines a normal BCG response and discusses the management of complications when they occur.

BCG Vaccine↗
PubMed1999

Sustained bronchoprotection, bronchodilatation, and symptom control during regular formoterol use in asthma of moderate or greater severity. The Canadian FO/OD1 Study Group.

BACKGROUND: Recent studies have raised concern that regular inhalation of beta2 -agonists may cause a worsening of asthma control compared with on-demand dosing regimens. OBJECTIVE: The objective of this study was to compare the effect of twice daily formoterol (Foradil), 4 times daily albuterol, and on-demand albuterol on bronchial hyperresponsiveness (BHR), lung function measurements, symptoms, and other indicators of disease control over 6 months inpatients with asthma of moderate or greater severity receiving concomitant inhaled corticosteroids. We also looked for occurrence of rebound BHR on discontinuation of treatment. METHODS: This was a multicenter, parallel-group, double-blind, clinical trial. Methacholine PC20 was the primary outcome variable. Other outcome variables included symptom scores, use of rescue medication, morning peak expiratory flow (PEF), serial FEV1 measurements, and asthma exacerbations. RESULTS: Of the 271 randomized patients, 217 completed the study. Formoterol was significantly superior to on-demand albuterol with regard to methacholine PC20, FEV1, PEF, symptom scores, and use of rescue medication at each measured time point/interval. Regular albuterol was superior to on-demand albuterol with regard to PC20 and FEV1, but not PEF or various clinical scores. After a small drop in the magnitude of bronchoprotection and bronchodilatation occurring shortly after randomization, there was no evidence of progressive tolerance to either regular treatment for any of the measured variables or of rebound increase in BHR 2 days after the end of treatment. The formoterol group had the lowest number of exacerbation days, as defined by high intake of rescue bronchodilator and/or symptom scores, whereas the number of exacerbations requiring increased corticosteroid coverage was similar in the 3 groups. CONCLUSION: In patients with asthma of moderate or greater severity receiving inhaled corticosteroids, formoterol taken twice daily resulted in superior bronchoprotection, bronchodilatation, and clinical control compared with on-demand albuterol over 6 months. Four times daily albuterol was superior to on-demand albuterol for only some of the end points. Progressive tolerance and a rebound increase in BHR on discontinuation of beta-agonists were not found

Adolescent↗
PubMed1999

Myopathy following mechanical ventilation for acute severe asthma: the role of muscle relaxants and corticosteroids.

BACKGROUND: Acute myopathy following mechanical ventilation for near-fatal asthma (NFA) has been described recently, and some researchers have suggested that this complication is related to the use of neuromuscular blocking agents (NMBAs) and corticosteroids (CSs). OBJECTIVES: To determine the incidence of acute myopathy in a group of patients and to examine the most important predictors of its development. DESIGN AND METHODS: A retrospective cohort study over a 10-year period (1985 to 1995) of all asthma patients who received mechanical ventilation at two centers in Vancouver (designated center 1 and center 2). RESULTS: In center 1, there were 58 patients who had 64 episodes of NFA, and in center 2, there were 28 patients who had 30 episodes. NMBAs were used in 30 of 86 admissions for acute severe asthma (35%). The mean (+/- SD) duration of muscle paralysis was 3.1+/-2.3 days. A total of 9 patients (10.4%) developed significant myopathy. The incidence of myopathy was 9 of 30 (30%) among patients who received NMBAs. In a multiple logistic regression model, the development of myopathy was only significantly associated with the duration of muscle relaxation. The odds ratio for the development of myopathy increased by 2.1 (95% confidence interval, 1.4 to 3.2) with each additional day of muscle relaxation. The dose and the type of the CS were not significantly associated with the myopathy in the multiple logistic regression analysis. CONCLUSION: Our study showed that there is a high incidence of acute myopathy when NMBAs are used for NFA. The incidence of myopathy increases with each additional day of muscle relaxation.

APACHE↗
PubMed1999

Use of incentives to increase compliance for TB screening in a population of intravenous drug users. Vancouver Injection Drug Use Study Group.

SETTING: Intravenous drug users (IDUs) represent a high risk group for dual human immunodeficiency virus (HIV) and tuberculosis (TB) infection. Screening with TB skin testing has therefore been suggested in this group. Subjects' compliance for returning to have TB skin test results read is a major problem. In the setting of a needle exchange program we evaluated the role of financial incentives to increase compliance. METHODS: We evaluated the role of giving a small financial incentive of Can $5 to subjects if they returned to have their purified protein derivative (PPD) skin test read. IDUs who had previously been skin-tested were compared with IDUs drawn from a similar population who, prospectively, were offered a financial incentive. RESULTS: During the initial period 558 subjects were evaluated and no incentive was offered. During the second phase of the study 549 IDUs were assessed but were also offered Can $5 if they returned to have their skin test read. Use of incentives increased compliance from 43% to 78% (P = 0.001). During the same period three active cases of TB were also diagnosed. CONCLUSIONS: We suggest that use of financial incentives can increase the return of IDUs to have their skin tests read. Further studies are required to assess the efficacy of follow-up interventions, especially the use of isoniazid chemoprophylaxis.

Adult↗
PubMed1998

Acceptance of amniocentesis by women in the state of Montana (USA) who are screen positive for Down's syndrome.

OBJECTIVE: To assess factors influencing uptake of amniocentesis after a positive Down's syndrome screening result. METHODS: Interviews of 53 Montana women with screening risks > or = 1 in 300 after delivery. RESULTS: Thirty had accepted amniocentesis ("yes" group) and 23 had declined ("no" group) (57% uptake). Age at delivery was significantly higher (p = 0.02) for the "no" than the "yes" group (mean 35.3 nu 31.7 years). The mean risk of Down's syndrome ascertained by screening was 1 in 190 for the "no" group and 1 in 115 for the "yes" group (p = 0.05). Statistically significant differences (p < or = 0.05) between opinions in the two groups included: (a) desire to know if the fetus had Down's syndrome; (b) perception of the burden of care for an affected child; (c) support of doctor, spouse, and relatives for choice about amniocentesis; (d) attitudes toward abortion; (e) importance of religion; and (f) concerns about the amniocentesis procedure. The most important factor for those choosing amniocentesis was knowing if the fetus had Down's syndrome, and for those not choosing amniocentesis, attitude about abortion. CONCLUSION: Our results show the need for prescreening education to enable pregnant women to make informed decisions about screening for Down's syndrome and diagnostic testing.

Adult↗
PubMed1998

Airway wall thickness in patients with near fatal asthma and control groups: assessment with high resolution computed tomographic scanning.

BACKGROUND: Airway wall thickening has been observed in post mortem studies of patients with asthma. Assessment of airway wall thickening by high resolution computed tomographic (HRCT) scanning has been reported in experimental studies. We have used HRCT scanning to measure airway wall thickness at the segmental and subsegmental levels in 40 patients with asthma and 14 normal controls. METHODS: The subjects were prospectively divided into four age and sex matched groups: 14 patients with a history of near fatal attack of asthma (NFA; group 1), 12 patients with moderate asthma (group 2), 13 patients with mild asthma (group 3), and 14 normal controls (group 4). All subjects were non-smokers. High resolution (1 mm collimation) CT scans of the chest were done at five different levels. RESULTS: The mean (SD) forced expiratory volume in one second (FEV1) was 68 (20)% of predicted for group 1, 73 (12)% for group 2, 102 (12)% for group 3, and 103 (12)% for group 4. The ratio of airway wall thickness to outer diameter (T/D) and the percentage wall area (WA%) defined as (wall area/total airway area) x 100 were used to compare airway wall thickness between the groups. The mean (SD) T/D and WA% were 0.27 (0.05) and 78.0 (9.2)% for group 1, 0.27 (0.05) and 78.8 (9.2)% for group 2, 0.25 (0.04) and 74.2 (7.5)% for group 3, and 0.23 (0.04) and 70.9 (8.2)% for group 4. T/D and WA% were not significantly different between groups 1 and 2. However, both groups 1 and 2 had higher T/D and WA% than either group 3 or 4 (p < 0.001) and group 3 had a higher T/D and WA% than group 4 (p < 0.03). The differences (95% CI) between the groups in WA% were 7.1% (0 to 14.4) for groups 1 and 4, 3.8% (-3.4 to 10) for groups 1 and 3, and 3.3% (-4.4 to 10) for groups 3 and 4. The differences between the groups in T/D and WA% were noted both for those with airways with a luminal diameter of > 2 mm and those with a luminal diameter of < or = 2 mm. CONCLUSIONS: All the patient groups had greater airway wall thickening than the normal subjects as assessed by HRCT scanning, but patients with more severe asthma had greater airway wall thickening than those with mild asthma. The methodology described in this study may be useful in assessing airway calibre in early intervention studies with anti-inflammatory therapy.

Adult↗
PubMed1998

Tuberculosis among health care workers in British Columbia.

OBJECTIVES: To compare the clinical features and prevalence of active TB in British Columbia (BC) health-care workers (HCWs) with those of the general population, between 1991 and 1996. METHODS: Comparison of 25 HCWs and 50 controls randomly selected from the Centres for Disease Control registry, with respect to demographics, prevention, diagnosis and management. RESULTS: HCWs had fewer related risk factors, but more had initiated prior chemoprophylaxis (16% vs. 0%, P < 0.01) and knew their bacille Calmette-Guerin (BCG) (68% vs. 24%, P < 0.001) and purified protein derivative (PPD) status (60% vs 32%, P < 0.05). There were no differences in symptom duration (3.3+/-3.6 vs. 3.0+/-3.4 months), mycobacteriology and diagnostic features, treatment duration (264.9+/-69.9 vs. 239.0+/-78.7 days) and completion rates (84% for both). All HCWs used self-administered treatment (100% vs. 70%, P < 0.01), and fewer were hospitalized (8% vs. 28%, P < 0.05). Disease rates in nurses (3.6+/-4.4 per 100 000) were lower than the general population rates (9.0+/-0.8), but did not differ among physiotherapists (8.96+/-21.95), general practitioners (7.60+/-11.78) and medical residents (30.75+/-75.32); CONCLUSIONS: Clinical features were similar in HCWs, but management strategies differed. BC HCWs are not at increased risk of tuberculosis, but the small sample size limited the power of our study to detect such an increase.

Adult↗
PubMed1998

Acceptance and safety of directly observed versus self-administered isoniazid preventive therapy in aboriginal peoples in British Columbia.

OBJECTIVE: To document experience with directly observed chemoprophylaxis (DOPT) compared to self-administered isoniazid (INH) among aboriginal persons in British Columbia. DESIGN: DOPT was compared to self-administered delivery (SAD) over a 3-year period. All aboriginal persons who received INH chemoprophylaxis in British Columbia between 1992 and 1994 were evaluated. Therapy completion rates and adverse outcomes associated with SAD were compared with DOPT. Treatment allocation was by patient choice. RESULTS: Of 608 people who received INH prophylaxis, 443 received SAD (mean age 31.6 years) and 165 received DOPT (mean age 23.9 years). Two hundred and seventy (60.9%) SAD compared to 124 (75.2%) in the DOPT group completed 6 months of INH (P = 0.0011). The 12-month completion rates were 162/443 (36.6%) for the SAD group and 84/165 (50.9%) for the DOPT group (P = 0.0014). Adverse reactions requiring discontinuation of medication occurred in 13.5% of the patients on SAD and 9.7% of those receiving DOPT (P = 0.202). The most common reason cited for failure to complete therapy was non-cooperation in both groups. There were three deaths in the SAD group, one of which was due to suicide by self-ingestion of INH. CONCLUSIONS: These data demonstrate that in aboriginal people compliance with preventive therapy can be improved by DOPT. Non random allocation to treatment groups might have influenced our findings, and further prospective randomized trials and cost-effectiveness analyses are required.

Adult↗