Reaming the intramedullary canal during tibial nailing does not affect in vivo intramuscular pH of the anterior tibialis.

Many investigations have evaluated local and systemic consequences of intramedullary (IM) reaming and suggest that reaming may cause, or exacerbate, injury to the soft tissues adjacent to fractures. To date, no study has examined the effect on local muscular physiology as measured by intramuscular pH (IpH). Here, we observe in vivo IpH during IM reaming for tibia fractures. Methods: Adults with acute tibia shaft fractures (level 1, academic, 2019-2021) were offered enrollment in an observational cohort. During IM nailing, a sterile, validated IpH probe was placed into the anterior tibialis (<5 cm from fracture, continuous sampling, independent research team). IpH before, during, and after reaming was averaged and compared through repeated measures ANOVA. As the appropriate period to analyze IpH during reaming is unknown, the analysis was repeated over periods of 0.5, 1, 2, 5, 10, and 15 minutes prereaming and postreaming time intervals. Results: Sixteen subjects with tibia shaft fractures were observed during nailing. Average time from injury to surgery was 35.0 hours (SD, 31.8). Starting and ending perioperative IpH was acidic, averaging 6.64 (SD, 0.21) and 6.74 (SD, 0.17), respectively. Average reaming time lasted 15 minutes. Average IpH during reaming was 6.73 (SD, 0.15). There was no difference in IpH between prereaming, intrareaming, and postreaming periods. IpH did not differ regardless of analysis over short or long time domains compared with the duration of reaming. Conclusions: Reaming does not affect IpH. Both granular and broad time domains were tested, revealing no observable local impact.

Emergency department presentations for hoverboard-related injuries: the electronic Canadian Hospitals Injury Reporting and Prevention Program, 2015 to 2016. / Blessures associées aux planches gyroscopiques traitées dans les services d'urgence au Canada : plate-forme électronique du Système canadien hospitalier d'information et de recherche en prévention des traumatismes, 2015-2016.

TITRE: Blessures associées aux planches gyroscopiques traitées dans les services d'urgence au Canada : plate forme électronique du Système canadien hospitalier d'information et de recherche en prévention des traumatismes, 2015-2016.

Occupational injuries in Canadian youth: an analysis of 22 years of surveillance data collected from the Canadian Hospitals Injury Reporting and Prevention Program.

INTRODUCTION: Inexperience, inadequate training and differential hazard exposure may contribute to a higher risk of injury in young workers. This study describes features of work-related injuries in young Canadians to identify areas for potential occupational injury prevention strategies. METHODS: We analyzed records for youth aged 10-17 presenting to Canadian Hospitals Injury Reporting and Prevention Program (CHIRPP) emergency departments (EDs) from 1991-2012. We classified work-related injuries into job groups corresponding to National Occupational Classification for Statistics 2006 codes and conducted descriptive analyses to assess injury profiles by job group. Age- and sex-adjusted proportionate injury ratios (PIRs) and 95% confidence intervals (CIs) were calculated to compare the nature of injuries between occupational and non-occupational events overall and by job group. RESULTS: Of the 6046 injuries (0.72% of events in this age group) that occurred during work, 63.9% were among males. Youth in food and beverage occupations (54.6% males) made up 35.4% of work-related ED visits and 10.2% of work-related hospital admissions, while primary industry workers (76.4% males) made up 4.8% of work-related ED visits and 24.6% of work-related hospital admissions. PIRs were significantly elevated for burns (9.77, 95% CI: 8.94-10.67), crushing/amputations (6.72, 95% CI: 5.79-7.80), electrical injuries (6.04, 95% CI: 3.64-10.00), bites (5.09, 95% CI: 4.47-5.79), open wounds (2.68, 95% CI: 2.59-2.78) and eye injuries (2.50, 95% CI: 2.20-2.83) in occupational versus non-occupational events. These were largely driven by high proportional incidence of injury types unique to job groups. CONCLUSION: Our findings provide occupation group-specific information on common injury types that can be used to support targeted approaches to reduce incidence of youth injury in the workplace.

TITRE: Accidents de travail impliquant des jeunes Canadiens : analyse de 22 années de surveillance des données recueillies à partir du Système canadien hospitalier d'information et de recherche en prévention des traumatismes. INTRODUCTION: L'inexpérience, une formation inadéquate et une exposition accrue au danger sont susceptibles de contribuer à un risque plus élevé d'accidents chez les jeunes travailleurs. Cette étude décrit les caractéristiques des accidents de travail impliquant de jeunes Canadiens afin d'identifier les secteurs pour lesquels élaborer des stratégies de prévention en matière d'accidents de travail. MÉTHODOLOGIE: Nous avons analysé le dossier des jeunes de 10 à 17 ans qui se sont présentés à un service des urgences (SU) faisant partie du Système canadien hospitalier d'information et de recherche en prévention des traumatismes (SCHIRPT) entre 1991 et 2012. Nous avons classé les accidents de travail en fonction de groupes d'emploi correspondant à la Classification nationale des professions (codes statistiques 2006) et nous avons effectué des analyses descriptives afin d'établir le profil des accidents en fonction de ces groupes d'emploi. Nous avons calculé des rapports proportionnels de blessures (RPB) en fonction de l'âge et du sexe ainsi que des intervalles de confiance à 95 % pour comparer la nature des blessures survenues en contexte professionnel et en contexte non professionnel, à la fois dans l'ensemble et par groupe d'emploi. RÉSULTATS: Parmi les 6 046 blessures ayant eu lieu au travail (0,72 % des cas dans ce groupe d'âge), 63,9 % touchaient des garçons. Les jeunes (54,6 % de garçons) œuvrant dans l'industrie des aliments et des boissons ont formé 35,4 % des consultations aux SU en lien avec le travail et 10,2 % des admissions liées au travail, alors que les travailleurs du secteur primaire (76,4 % de garçons) représentaient 4,8 % des consultations aux SU liées au travail et 24,6 % des admissions liées au travail. Les RPB ont été significativement élevés pour les brûlures (9,77, IC à 95 % : 8,94 à 10,67), les blessures par écrasement et les amputations (6,72, IC à 95 % : 5,79 à 7,80), les blessures causées par l'électricité (6,04, IC à 95 % : 3,64 à 10,00), les morsures (5,09, IC à 95 % : 4,47 à 5,79), les plaies ouvertes (2,68, IC à 95 % : 2,59 à 2,78) et les lésions oculaires (2,50, IC à 95 % : 2,20 à 2,83) dans un contexte professionnel par rapport aux cas en contexte non professionnel. Ceci s'explique en bonne partie par l'incidence proportionnelle élevée de certains types de blessures spécifiques à des groupes d'emploi. CONCLUSION: Nos conclusions fournissent des renseignements relatifs à certains groupes professionnels sur des types de blessures courantes susceptibles de favoriser l'adoption d'approches ciblées à l'égard de la réduction de l'incidence des blessures chez les jeunes en milieu de travail.

Chronic kidney disease on hemodialysis is associated with decreased serum PCSK9 levels.

OBJECTIVES: Serum low density lipoprotein-cholesterol (LDL-C) correlates positively with serum PCSK9 in the general population, consistent with PCSK9 being a determinant of LDL-C levels. Patients with chronic kidney disease (CKD) on hemodialysis (HD) have lower total cholesterol (TC) and LDL-C compared to the general population. Serum PCSK9 and its relationship with serum lipids have not been reported in CKD patients on HD (CKD-HD). METHODS: We measured serum PCSK9 by ELISA and lipid levels in 66 CKD-HD patients and compared them to 178 non-CKD subjects. Since statins increase serum PCSK9 levels, CKD-HD patients were separated into those not on statin therapy (HD-NS, n = 32) and those taking statins (HD-S, n = 34). No control subjects were on statin therapy. RESULTS: Serum PCSK9, TC, LDL-C and HDL-C levels were significantly lower in the CKD-HD group (n = 66) compared to the control group. HD-NS patients showed lower PCSK9, TC and LDL-C levels than control subjects and PCSK9 levels correlated with TC and LDL-C levels (r = 0.35, p = 0.050; r = 0.423, p = 0.0158 respectively) as well as TG levels (r = 0.413, p = 0.0188). In HD-S patients, PCSK9 levels were not significantly different from the non-CKD group. There was no correlation between PCSK9 levels and TC and LDL-C levels in the HD-S group. CONCLUSION: Our data are the first quantitative analysis of serum PCSK9 levels in CKD-HD patients. We show that serum PCSK9 in HD-NS patients is decreased and it retains a positive correlation with LDL-C, suggesting that PCSK9 may remain a significant determinant of LDL-C in CKD-HD subjects. We also show that statin therapy disrupts the correlation between LDL-C and PCSK9 in CKD-HD patients. These data suggest that the regulation of LDL-C by PCSK9 remains intact in CKD-HD patients. PCSK9 may also play a role in the metabolism of triglyceride-rich lipoproteins in CKD-HD patients.

Rate and variability of finger tapping as measures of lateralized concurrent task effects.

Using a sample of 48 normal right-handed adults, we assessed the effects of oral reading on concurrent unimanual finger tapping under all combinations of instructional set (speeded vs. consistent tapping), tapping movement (repetitive vs. alternating), task emphasis (reading emphasized vs. tapping emphasized), and tapping hand. Change in tapping rate and variability was measured relative to the corresponding single task control condition. Reading decreased the rate of speeded finger tapping but increased the rate of consistent tapping. In both instances, the right hand was affected more than the left hand. Asymmetries were comparable for repetitive and alternating tapping. When measured in terms of variability, however, effects were largely symmetric. The findings clarify the conditions under which lateralized concurrent task effects are most likely to occur and show that such effects are not statistical artifacts. It appears that subjects attempt to coordinate the timing of concurrent activities and that speech timing is more strongly linked to right-hand control than to left-hand control in right-handers.

Survival of animal tissue cells in primary culture in the absence of serum.

The ability of cells from tissues of several species of animals to survive in primary culture without serum was tested. Of the species tested, cells from the kidneys of Macaca mulatta (rhesus) and Cercopithecus aethiops (vervet) monkeys and chicken embryo cells not only survived under these conditions, but indeed developed into confluent monolayer cultures. The addition of either serum or its globulin or albumin fraction enhanced the development of cell monolayers and permitted those cells unable to survive in the absence of serum to do so. Certain specific protein trypsin-inhibitors not of serum origin were unable to provide conditions necessary for cell survival or growth when used in place of serum proteins.