Search PubMed⌕ Search

Biomedical subjects

E Lynch

Publications and source records attributed to E Lynch.

86 records · Page 5Linked to original sources

The issue of anti-D: an integrated seamless approach from recognition of need to bedside administration.

BACKGROUND: The appropriate and timely administration of Anti-D immunoglobulin to Rhesus (D) negative women who have delivered Rhesus (D) positive babies is a vital part of obstetric care. Anti-D has an especially high profile in Ireland because of the tragic inadvertent transmission of Hepatitis C to Irish women in past decades. AUDIT: We have reviewed our policy and procedures pertaining to the administration of Anti-D for sensitising events during pregnancy and postnatally, in the Mid-Western Health Board in 1999/2000. As a result, major changes were made in the storage, issue, recording and administration of Anti-D. New procedures in the transfusion laboratory and in the maternity hospital have been accepted by scientists and midwives and supported by haematology and obstetric medical staff. The pharmacy and haematology laboratory no longer have a role in this programme. IMPLEMENTATION OF MULTI-DISCIPLINARY CHANGE MANAGEMENT: As a result of these changes, the storage, issuing and tracking of Anti-D has become the responsibility of the hospital blood bank. Measurement offoeto-maternal haemorrhage (FMH) is now the responsibility of bio medical scientists in blood bank, utilising both flow cytometry (increasingly recognised as the gold standard method) and the Kleihauer method (Kleihauer-Betke). The programme has moved from a doctor-administered IV Anti-D Ig, to a midwife-administered IM preparation. Prescription remains the responsibility of the doctor. These changes are facilitated by the protocol guided issue of the appropriate dose of Anti-D Ig by bio medical scientists to midwives. The issue of the Anti-D Ig occurs simultaneously with issue of results of mother and baby's serology testing and estimation of volume of FMH. These major changes have been guided by audit and needs assessment and require close liaison between medical, nursing and laboratory scientific staff in haematology, transfusion and obstetrics. CRITICAL INCIDENT AUDIT-CASE REPORT: Before new procedures became official policy, a critical incident audit allowed us to pilot our protocol and to revise it using draft new procedures. In this critical incident we describe successful management of a patient with a large foeto-maternal haemorrhage. This incident supported the need for the procedural enhancements already underway. This critical incident re-emphasised the need for the planned systems improvements to be introduced quickly.

Adult↗

Multicomponent evaluations of the oxidising actions and status of a peroxoborate-containing tooth-whitening system in whole human saliva using high resolution proton NMR spectroscopy.

High resolution 1H nuclear magnetic resonance (NMR) spectroscopy was employed to conduct a multicomponent investigation of the oxidation of salivary biomolecules by peroxoborate present in a tooth-whitening dentifrice formulation. The results acquired demonstrated that peroxoborate gave rise to the oxidative decarboxylation of the hydrogen peroxide scavenger pyruvate, a reaction generating acetate and CO2 as products. Experiments performed on chemical model systems confirmed the oxidative consumption of pyruvate by dentifrice-derived peroxoborate, and also revealed that the salivary electron donors cysteine and methionine (precursors to volatile sulphur compounds), were oxidised to cystine and methionine sulphoxide respectively. The biochemical and periodontal significance of these results is discussed.

Borates↗

Detection of Streptococcus mutans by PCR amplification of the spaP gene in teeth rendered caries free.

OBJECTIVES: To investigate the degree of association between tactile and optical criteria as used to assess the carious status of the enamel-dentine junction (EDJ) during cavity preparation, assessment with a caries detector dye and detection of Streptococcus mutans using culture and polymerase chain reaction (PCR) techniques. METHODS: Twenty-nine teeth, extracted within the previous 30 min, and 15 teeth prepared under rubber dam in vivo, were clinically assessed at the EDJ after the removal of evident carious tissue. Demineralisation was then assessed using a caries detector dye (1% acid red in propylene glycol; Cavex). A rosehead bur was used to remove tissue at the EDJ for culture and PCR analysis. Culture was carried out on a tryptone yeast cystine sucrose bacitracin selective medium, and PCR used to amplify a sequence (192 bp) of the spaP gene, which encodes the surface protein antigen I/II of S. mutans. RESULTS: Demineralised tissue at the EDJ, as shown using the dye, was found in 52% of teeth. Removed tissue was culture and PCR positive for S. mutans in 2 and 47% of teeth, respectively. A highly significant association (77% of cases; P < 0.001) was shown between dye and PCR assessment methods. No association was found between any other combination of assessment methods. CONCLUSIONS: Culture methods may underestimate the presence of S. mutans. Removal of sufficient dye-stained tissue is therefore recommended to prevent further carious assault from residual S. mutans.

Antigens, Bacterial↗

Developing BSN leaders for the future: the Fuld Leadership Initiative for Nursing Education (LINE).

The Helene Fuld Leadership Initiative in Nursing Education (LINE) program was designed to enhance beginning leadership competencies of baccalaureate nursing students. Given the increasing need for strong and effective leadership throughout the health care system, and the demands new graduates encounter as they move into practice, the LINE program is built on the premise that leadership skills must be instilled at the undergraduate level. The program achieves its goal through an intensive 5-day institute focused on assessing and developing the leadership competencies of nurse educators and their clinical partners to enable them to be effective agents of curriculum change in their home institutions. The institute also assists participants to redesign their baccalaureate nursing (BSN) curricula to ensure that students learn to: (1) work effectively within and across complex, integrated organizational and institutional boundaries; (2) think and act from the perspective of a system; and (3) communicate, negotiate, lead, and facilitate change within health care organizations. D. Goleman's (1998) framework of emotional intelligence, which addresses both personal competence (managing oneself) and social competence (handling one's relationships with others) provides the framework for operationalizing leadership in the BSN curriculum. To date, 26 BSN programs and their clinical partners have participated in the LINE program, which has the potential to influence the beginning leadership development of more than 2,400 BSN students. Program outcomes reveal that education-practice collaboration, professional networking, individual leadership development of nurse educators and their clinical partners as change agents, and the integration of leadership experiences at all levels of the BSN curriculum are important in developing beginning leadership competencies in BSN students.

Communication↗

Is home tooth bleaching gel cytotoxic?

Tooth whitening systems are widely used clinically and for home usage. The aim of this study was to determine the effects of two bleaching gels, each containing 10 percent and 15 percent carbamide peroxide, respectively, a 'bleaching gel' without carbamide peroxide, and carbamide peroxide alone on the viability of human endothelial cells in vitro in comparison with culture medium that acted as a negative control. The incubation period used was 30 minutes. A colorimetric viability assay (MTT assay) was employed. The results showed that the gel without carbamide peroxide is not cytotoxic compared to the negative control, while carbamide peroxide on its own and 10 percent and 15 percent carbamide peroxide bleaching gels were cytotoxic, but there were no significant differences (p greater than 0.05) among these latter three test groups. These data indicate that 10 percent and 15 percent carbamide peroxide bleaching gels are cytotoxic and that carbamide peroxide is the component responsible for this cytotoxic effect. This paper also discusses why this in vitro cytotoxic effect appears not to be significant in vivo.

Analysis of Variance↗

Bond strength of fiber-reinforced composite resin restorations.

Severe tooth wear is common in older dentate individuals, with one treatment option being composite resin restorations reinforced with a suitable matrix. This study evaluated the use of high modulus polyethylene (Celanese) fibers as a reinforcing matrix for composite resin. Human mandibular incisor teeth were sectioned to simulate severe tooth wear. Sectioned surfaces were measured, the teeth paired and assigned to control or test sample groups, and further assigned to be tested with a labial or lingual shearing force. A phosphorylated dentin bonding adhesive was applied to the abraded dentin surface. Labial and lingual intra-enamel bevel preparations were cut on each specimen. A piece of Celanese fabric was bonded onto the acid-etched labial and lingual bevels of the test specimens using an enamel bonding agent. Class IV composite resin restorations were then placed onto the test and control specimens. Following water storage, the specimens were subjected to shearing forces. Bond strengths for test specimens were significantly greater (p < 0.03) than the controls. Specimens with a labially applied force also had significantly higher bond strengths (p < 0.001). SEM analysis revealed adhesive bond failures over dentin surfaces, with cohesive bond failures within the composite resin. Celanese fibers maintained the restorations on the teeth, although adhesive failures were seen between the fibers and enamel bonding agent.

Analysis of Variance↗

The influence of specific foods and oral hygiene on the microflora of fissures and smooth surfaces of molar teeth: A 5-day study.

A group of 20 students, harbouring >10(4) mutans streptococci per millilitre of saliva, was enrolled into the study. Models for sampling, reproducibly, the dental plaque present in specific sites (fissure and smooth surface) on the dentition were developed and validated. Withdrawal of normal oral hygiene procedures for only 1 day resulted in approximately 10-fold increases in the number of micro-organisms recovered from both sites. The effect of supplementing the subjects' diets with particular food items given 5 times per day [lemonade (5.8% w/v sugars, 250 ml), biscuits (digestive biscuits, 67.6% w/w carbohydrate of which 22% w/w was sugars and 45.6% w/w was starch), caramel toffees and sugar lumps] on the number of micro-organisms recovered and on the composition of the flora at both sites was determined. Dental plaque samples were taken after 5 days and it was found that supplementation of the diet with toffee and sugar lumps resulted in significantly more micro-organisms at both sampling sites. The supplementation of the diets with lemonade or biscuits did not significantly alter the numbers of micro-organisms recovered from either site. The percentage composition of the plaque samples from both dental sites remained relatively unaffected by oral hygiene although there were lower levels of mutans streptococci which might be related to the use of an antimicrobial toothpaste containing fluoride, triclosan and zinc citrate. This study suggests that the cariogenicity of certain sucrose-containing foods may, in part, be due to the enhancement of plaque accumulation in addition to other effects on the percentage composition of the plaque which may become manifest on prolonged usage of these dietary foodstuffs. These observations are consistent with dietary survey findings which often find consumption of confectionery related to caries experience or incidence.

Actinomyces↗

Antimicrobial effect of a novel ozone- generating device on micro-organisms associated with primary root carious lesions in vitro.

The aims of this present study were (1) to assess the antimicrobial effect of ozone from a novel ozone-generating device (Heolozone, USA) [0.052% (v/v) in air delivered at a rate of 13.33 ml.s(-1)] on primary root carious lesions (PRCLs) and (2) to evaluate the efficacy of ozone specifically on Streptococcus mutans and Streptococcus sobrinus. In study 1, 40 soft PRCLs from freshly extracted teeth were randomly divided into two groups to test the antimicrobial effect on PRCLs from exposure to ozonated water for either 10 or 20 s. Half of a lesion was removed using a sterile excavator. Subsequently, the remaining lesion was exposed to the ozonised water for a period of either 10 or 20 s (corresponding to 0. 069 or 0.138 ml of ozone, respectively). Using paired Student t tests, a significant (p<0.001) reduction (mean +/- SE) was observed in the ozone-treated groups with either a 10-second (log(10) 3.57+/-0.37) or 20-second (log(10) 3.77+/-0.42) ozone application compared with the control groups (log(10) 5.91+/-0.15 and log(10) 6.18+/-0.21, respectively). In study 2, 40 sterile saliva-coated glass beads were randomly divided into two groups for each micro-organism. One glass bead was put into each bijou bottle with 3 ml of Todd-Hewitt broth. S. mutans and S. sobrinus were inoculated anaerobically overnight. Each glass bead was then washed with 2 ml of phosphate-buffered saline. Immediately, 10 s of ozone gas was applied to each glass bead in the test groups. There was a significant (p<0.0001) reduction (mean +/- SE) in ozone-treated samples for S. mutans (log(10) 1.01+/-0.27) and S. sobrinus (log(10) 1.09+/-0.36) compared with the control samples (log(10) 3.93+/-0.07 and log(10) 4.61+/-0.13, respectively). This treatment regime is an effective, quick, conservative and simple method to kill micro-organisms in PRCLs. Ozone gas application for a period of 10 s was also capable of reducing the numbers of S. mutans and S. sobrinus on saliva-coated glass beads in vitro.

Anaerobiosis↗

Reversal of primary root caries using dentifrices containing 5,000 and 1,100 ppm fluoride.

This study compared the ability of two sodium fluoride dentifrices, one containing 5,000 ppm fluoride (Prevident 5000 Plus) and the other 1,100 ppm fluoride (Winterfresh Gel), to reverse primary root caries lesions (PRCLs). A total of 201 subjects with at least one PRCL each entered the study and were randomly allocated to use one of the dentifrices. After 6 months, 186 subjects were included in statistical analyses. At baseline and after 3 and 6 months, the lesions were clinically assessed and their electrical resistance measured using an electrical caries monitor. After 3 months, 39 (38.2%) of the 102 subjects in the 5,000 ppm F- group and 9 (10.7%) of 84 subjects using the 1,100 ppm F- dentifrice, had one or more PRCLs which had hardened (p = 0.005). Between baseline and 3 months, the log10 mean +/- SD resistance values of lesions for subjects in the 1,100 ppm F- group had decreased by 0.06+/-0.55, whereas those in the 5,000 ppm F- group had increased by 0.40+/-0.64 (p<0.001). After 6 months, 58 (56.9%) of the subjects in the 5,000 ppm F- group and 24 (28.6%) in the 1,100 ppm F- group had one or more PRCLs that had become hard (p = 0.002). Between baseline and 6 months, the log10 mean +/- SD resistance values of lesions for subjects in the 1,100 ppm F- group decreased by 0.004+/-0.70, whereas in the 5,000 ppm F- group, they increased by 0.56+/-0.76 (p<0.001). After 3 and 6 months, the distance from the apical border of the root caries lesions to the gingival margin increased significantly in the 5,000 ppm F- group when compared with the 1,100 ppm F- group. The plaque index in the 5,000 ppm F- group was also significantly reduced when compared with the 1,100 ppm F- group. The colour of the lesions remained unchanged. It was concluded that the dentifrice containing 5,000 ppm F- was significantly better at remineralising PRCLs than the one containing 1,100 ppm F-.

Adult↗

Fluoride concentrations in saliva and dental plaque in young children after intake of fluoridated milk.

This study determined fluoride (F) concentrations in whole saliva and dental plaque after intake of fluoridated milk using a randomised crossover experimental design. Eighteen healthy children (6-8 years) were subjected to each of four different 3-day drinking regimens: (a) 200 ml F-free tap water; (b) 200 ml tap water with 1.0 mg F; (c) 200 ml standard milk, and (d) 200 ml standard milk with 1.0 mg F. A washout period of 7 days was organised between the different drinking regimens. All children used F-free toothpaste prior to and during the trial and were instructed to avoid F-rich food and drinks. F concentration in unstimulated whole saliva was determined at baseline and after 15 and 120 min and in plaque samples at baseline and after 2 h. The mean baseline values ranged from 0.01 to 0.02 mg F/l in saliva and between 10.4 and 14.2 mg F/l in dental plaque. A statistically significant (p < 0.05) increase of F was disclosed in saliva 15 min after drinking F-containing milk and water (0.052 and 0.058 mg F/l, respectively). After 2 h, the salivary F(-) concentrations were back to baseline values. In the plaque, however, a statistically significant (p < 0.01) twofold increase was found at 2 h after the intake of fluoridated milk and water, respectively. The results indicate that consumption of fluoridated milk contributes to a F storing process with significantly elevated F concentrations in dental plaque up to 2 h after intake. Further studies are required to determine the 'therapeutic concentration' of F in dental plaque after intake of fluoridated milk.

Animals↗

The cardiovascular health impact of an incentive worksite health promotion program.

PURPOSE: We examined the cardiovascular health profiles of benefit-eligible hospital employees who participated in an incentive screen program for 4 years. We also determined if cardiovascular health changes differed between participants (CHAP) who enrolled in structured follow-up risk reduction programs (CHAPplus) compared with those who chose less formal options (CHAPonly). METHODS: CHAP consisted of cardiovascular screens, results counseling, and encouragement to participate in education and behavioral support programs. After adjusting for gender, medication use, and baseline levels of adiposity and physical activity, cardiovascular health changes were tested with repeated-measures analysis of covariance (ANCOVA) among CHAP participants and by CHAP type. RESULTS: CHAP 4-year members (n = 278) were generally healthy and mostly women (87%) with an average age of 40.6 +/- .5 years at baseline. Despite increases in overall (p = .034) and central adiposity (p = .001), cardiovascular health improvements were found for the total cholesterol/high-density lipoprotein ratio (TCHOL/HDL; p = .007), low-density lipoprotein (p = .009), and blood glucose (p = .018) among 4-year CHAP members. CHAPonly employees showed greater improvements in most cardiovascular health indicators than CHAPplus participants, although these differences did not achieve statistical significance. DISCUSSION: Cardiovascular health improvements were associated with long-term participation in a hospital worksite incentive screen program. The cardiovascular health benefits tended to be greatest for CHAP employees who chose informal follow-up risk reduction options (CHAPonly) than those who enrolled in structured programs (CHAPplus).

Adult↗

Relationship of removable partial denture use to root caries in an older population.

The pattern and severity of root caries in a selected older population, living in the community and attending a general dental practice in Bexhill, East Sussex, England, is reported. A total of 146 patients were examined to determine the relationship among removable partial dentures, their design, and root caries. Of those patients, 57% wore removable dentures and had a higher prevalence of exposed root surfaces and root caries, particularly on abutment teeth. In addition, root caries lesions on abutment surfaces were found to be larger and more active than those on nonabutment surfaces.

Aged↗